* MAINTAINERS: Remove chill maintainers.

[pf3gnuchains/gcc-fork.git] / gcc / gcc.c

/* Compiler driver program that can handle many languages.
   Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   1999, 2000, 2001, 2002 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.

This paragraph is here to try to keep Sun CC from dying.
The number of chars here seems crucial!!!!  */

/* This program is the user interface to the C compiler and possibly to
other compilers.  It is used because compilation is a complicated procedure
which involves running several programs and passing temporary files between
them, forwarding the users switches to those programs selectively,
and deleting the temporary files at the end.

CC recognizes how to compile each input file by suffixes in the file names.
Once it knows which kind of compilation to perform, the procedure for
compilation is specified by a string called a "spec".  */

/* A Short Introduction to Adding a Command-Line Option.

   Before adding a command-line option, consider if it is really
   necessary.  Each additional command-line option adds complexity and
   is difficult to remove in subsequent versions.

   In the following, consider adding the command-line argument
   `--bar'.

   1. Each command-line option is specified in the specs file.  The
   notation is described below in the comment entitled "The Specs
   Language".  Read it.

   2. In this file, add an entry to "option_map" equating the long
   `--' argument version and any shorter, single letter version.  Read
   the comments in the declaration of "struct option_map" for an
   explanation.  Do not omit the first `-'.

   3. Look in the "specs" file to determine which program or option
   list should be given the argument, e.g., "cc1_options".  Add the
   appropriate syntax for the shorter option version to the
   corresponding "const char *" entry in this file.  Omit the first
   `-' from the option.  For example, use `-bar', rather than `--bar'.

   4. If the argument takes an argument, e.g., `--baz argument1',
   modify either DEFAULT_SWITCH_TAKES_ARG or
   DEFAULT_WORD_SWITCH_TAKES_ARG in this file.  Omit the first `-'
   from `--baz'.

   5. Document the option in this file's display_help().  If the
   option is passed to a subprogram, modify its corresponding
   function, e.g., cppinit.c:print_help() or toplev.c:display_help(),
   instead.

   6. Compile and test.  Make sure that your new specs file is being
   read.  For example, use a debugger to investigate the value of
   "specs_file" in main().  */

#include "config.h"
#include "system.h"
#include <signal.h>
#if ! defined( SIGCHLD ) && defined( SIGCLD )
#  define SIGCHLD SIGCLD
#endif
#include "obstack.h"
#include "intl.h"
#include "prefix.h"
#include "gcc.h"
#include "flags.h"

#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#if defined (HAVE_DECL_GETRUSAGE) && !HAVE_DECL_GETRUSAGE
extern int getrusage PARAMS ((int, struct rusage *));
#endif

/* By default there is no special suffix for target executables.  */
/* FIXME: when autoconf is fixed, remove the host check - dj */
#if defined(TARGET_EXECUTABLE_SUFFIX) && defined(HOST_EXECUTABLE_SUFFIX)
#define HAVE_TARGET_EXECUTABLE_SUFFIX
#else
#undef TARGET_EXECUTABLE_SUFFIX
#define TARGET_EXECUTABLE_SUFFIX ""
#endif

/* By default there is no special suffix for host executables.  */
#ifdef HOST_EXECUTABLE_SUFFIX
#define HAVE_HOST_EXECUTABLE_SUFFIX
#else
#define HOST_EXECUTABLE_SUFFIX ""
#endif

/* By default, the suffix for target object files is ".o".  */
#ifdef TARGET_OBJECT_SUFFIX
#define HAVE_TARGET_OBJECT_SUFFIX
#else
#define TARGET_OBJECT_SUFFIX ".o"
#endif

#ifndef VMS
/* FIXME: the location independence code for VMS is hairier than this,
   and hasn't been written.  */
#ifndef DIR_UP
#define DIR_UP ".."
#endif /* DIR_UP */
#endif /* VMS */

static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };

#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free

#ifndef GET_ENV_PATH_LIST
#define GET_ENV_PATH_LIST(VAR,NAME)     do { (VAR) = getenv (NAME); } while (0)
#endif

/* Most every one is fine with LIBRARY_PATH.  For some, it conflicts.  */
#ifndef LIBRARY_PATH_ENV
#define LIBRARY_PATH_ENV "LIBRARY_PATH"
#endif

#ifndef HAVE_KILL
#define kill(p,s) raise(s)
#endif

/* If a stage of compilation returns an exit status >= 1,
   compilation of that file ceases.  */

#define MIN_FATAL_STATUS 1

/* Flag set by cppspec.c to 1.  */
int is_cpp_driver;

/* Flag saying to pass the greatest exit code returned by a sub-process
   to the calling program.  */
static int pass_exit_codes;

/* Definition of string containing the arguments given to configure.  */
#include "configargs.h"

/* Flag saying to print the directories gcc will search through looking for
   programs, libraries, etc.  */

static int print_search_dirs;

/* Flag saying to print the full filename of this file
   as found through our usual search mechanism.  */

static const char *print_file_name = NULL;

/* As print_file_name, but search for executable file.  */

static const char *print_prog_name = NULL;

/* Flag saying to print the relative path we'd use to
   find libgcc.a given the current compiler flags.  */

static int print_multi_directory;

/* Flag saying to print the list of subdirectories and
   compiler flags used to select them in a standard form.  */

static int print_multi_lib;

/* Flag saying to print the command line options understood by gcc and its
   sub-processes.  */

static int print_help_list;

/* Flag indicating whether we should print the command and arguments */

static int verbose_flag;

/* Flag indicating whether we should ONLY print the command and
   arguments (like verbose_flag) without executing the command.
   Displayed arguments are quoted so that the generated command
   line is suitable for execution.  This is intended for use in
   shell scripts to capture the driver-generated command line.  */
static int verbose_only_flag;

/* Flag indicating to print target specific command line options.  */

static int target_help_flag;

/* Flag indicating whether we should report subprocess execution times
   (if this is supported by the system - see pexecute.c).  */

static int report_times;

/* Nonzero means write "temp" files in source directory
   and use the source file's name in them, and don't delete them.  */

static int save_temps_flag;

/* The compiler version.  */

static const char *compiler_version;

/* The target version specified with -V */

static const char *spec_version = DEFAULT_TARGET_VERSION;

/* The target machine specified with -b.  */

static const char *spec_machine = DEFAULT_TARGET_MACHINE;

/* Nonzero if cross-compiling.
   When -b is used, the value comes from the `specs' file.  */

#ifdef CROSS_COMPILE
static const char *cross_compile = "1";
#else
static const char *cross_compile = "0";
#endif

#ifdef MODIFY_TARGET_NAME

/* Information on how to alter the target name based on a command-line
   switch.  The only case we support now is simply appending or deleting a
   string to or from the end of the first part of the configuration name.  */

static const struct modify_target
{
  const char *const sw;
  const enum add_del {ADD, DELETE} add_del;
  const char *const str;
}
modify_target[] = MODIFY_TARGET_NAME;
#endif
 
/* The number of errors that have occurred; the link phase will not be
   run if this is non-zero.  */
static int error_count = 0;

/* Greatest exit code of sub-processes that has been encountered up to
   now.  */
static int greatest_status = 1;

/* This is the obstack which we use to allocate many strings.  */

static struct obstack obstack;

/* This is the obstack to build an environment variable to pass to
   collect2 that describes all of the relevant switches of what to
   pass the compiler in building the list of pointers to constructors
   and destructors.  */

static struct obstack collect_obstack;

/* These structs are used to collect resource usage information for
   subprocesses.  */
#ifdef HAVE_GETRUSAGE
static struct rusage rus, prus;
#endif

/* Forward declaration for prototypes.  */
struct path_prefix;

static void init_spec           PARAMS ((void));
#ifndef VMS
static char **split_directories PARAMS ((const char *, int *));
static void free_split_directories PARAMS ((char **));
static char *make_relative_prefix PARAMS ((const char *, const char *, const char *));
#endif /* VMS */
static void store_arg           PARAMS ((const char *, int, int));
static char *load_specs         PARAMS ((const char *));
static void read_specs          PARAMS ((const char *, int));
static void set_spec            PARAMS ((const char *, const char *));
static struct compiler *lookup_compiler PARAMS ((const char *, size_t, const char *));
static char *build_search_list  PARAMS ((struct path_prefix *, const char *, int));
static void putenv_from_prefixes PARAMS ((struct path_prefix *, const char *));
static int access_check         PARAMS ((const char *, int));
static char *find_a_file        PARAMS ((struct path_prefix *, const char *, int));
static void add_prefix          PARAMS ((struct path_prefix *, const char *,
                                         const char *, int, int, int *));
static void translate_options   PARAMS ((int *, const char *const **));
static char *skip_whitespace    PARAMS ((char *));
static void delete_if_ordinary  PARAMS ((const char *));
static void delete_temp_files   PARAMS ((void));
static void delete_failure_queue PARAMS ((void));
static void clear_failure_queue PARAMS ((void));
static int check_live_switch    PARAMS ((int, int));
static const char *handle_braces PARAMS ((const char *));
static char *save_string        PARAMS ((const char *, int));
static void set_collect_gcc_options PARAMS ((void));
static int do_spec_1            PARAMS ((const char *, int, const char *));
static const char *find_file    PARAMS ((const char *));
static int is_directory         PARAMS ((const char *, const char *, int));
static void validate_switches   PARAMS ((const char *));
static void validate_all_switches PARAMS ((void));
static void give_switch         PARAMS ((int, int, int));
static int used_arg             PARAMS ((const char *, int));
static int default_arg          PARAMS ((const char *, int));
static void set_multilib_dir    PARAMS ((void));
static void print_multilib_info PARAMS ((void));
static void perror_with_name    PARAMS ((const char *));
static void pfatal_pexecute     PARAMS ((const char *, const char *))
  ATTRIBUTE_NORETURN;
static void notice              PARAMS ((const char *, ...))
  ATTRIBUTE_PRINTF_1;
static void display_help        PARAMS ((void));
static void add_preprocessor_option     PARAMS ((const char *, int));
static void add_assembler_option        PARAMS ((const char *, int));
static void add_linker_option           PARAMS ((const char *, int));
static void process_command             PARAMS ((int, const char *const *));
static int execute                      PARAMS ((void));
static void clear_args                  PARAMS ((void));
static void fatal_error                 PARAMS ((int));
#ifdef ENABLE_SHARED_LIBGCC
static void init_gcc_specs              PARAMS ((struct obstack *,
                                                 const char *, const char *,
                                                 const char *));
#endif
#if defined(HAVE_TARGET_OBJECT_SUFFIX) || defined(HAVE_TARGET_EXECUTABLE_SUFFIX)
static const char *convert_filename     PARAMS ((const char *, int, int));
#endif
\f
/* The Specs Language

Specs are strings containing lines, each of which (if not blank)
is made up of a program name, and arguments separated by spaces.
The program name must be exact and start from root, since no path
is searched and it is unreliable to depend on the current working directory.
Redirection of input or output is not supported; the subprograms must
accept filenames saying what files to read and write.

In addition, the specs can contain %-sequences to substitute variable text
or for conditional text.  Here is a table of all defined %-sequences.
Note that spaces are not generated automatically around the results of
expanding these sequences; therefore, you can concatenate them together
or with constant text in a single argument.

 %%     substitute one % into the program name or argument.
 %i     substitute the name of the input file being processed.
 %b     substitute the basename of the input file being processed.
        This is the substring up to (and not including) the last period
        and not including the directory.
 %B     same as %b, but include the file suffix (text after the last period).
 %gSUFFIX
        substitute a file name that has suffix SUFFIX and is chosen
        once per compilation, and mark the argument a la %d.  To reduce
        exposure to denial-of-service attacks, the file name is now
        chosen in a way that is hard to predict even when previously
        chosen file names are known.  For example, `%g.s ... %g.o ... %g.s'
        might turn into `ccUVUUAU.s ccXYAXZ12.o ccUVUUAU.s'.  SUFFIX matches
        the regexp "[.A-Za-z]*%O"; "%O" is treated exactly as if it
        had been pre-processed.  Previously, %g was simply substituted
        with a file name chosen once per compilation, without regard
        to any appended suffix (which was therefore treated just like
        ordinary text), making such attacks more likely to succeed.
 %uSUFFIX
        like %g, but generates a new temporary file name even if %uSUFFIX
        was already seen.
 %USUFFIX
        substitutes the last file name generated with %uSUFFIX, generating a
        new one if there is no such last file name.  In the absence of any
        %uSUFFIX, this is just like %gSUFFIX, except they don't share
        the same suffix "space", so `%g.s ... %U.s ... %g.s ... %U.s'
        would involve the generation of two distinct file names, one
        for each `%g.s' and another for each `%U.s'.  Previously, %U was
        simply substituted with a file name chosen for the previous %u,
        without regard to any appended suffix.
 %jSUFFIX
        substitutes the name of the HOST_BIT_BUCKET, if any, and if it is
        writable, and if save-temps is off; otherwise, substitute the name
        of a temporary file, just like %u.  This temporary file is not
        meant for communication between processes, but rather as a junk
        disposal mechanism.
 %.SUFFIX
        substitutes .SUFFIX for the suffixes of a matched switch's args when
        it is subsequently output with %*. SUFFIX is terminated by the next
        space or %.
 %d     marks the argument containing or following the %d as a
        temporary file name, so that that file will be deleted if CC exits
        successfully.  Unlike %g, this contributes no text to the argument.
 %w     marks the argument containing or following the %w as the
        "output file" of this compilation.  This puts the argument
        into the sequence of arguments that %o will substitute later.
 %W{...}
        like %{...} but mark last argument supplied within
        as a file to be deleted on failure.
 %o     substitutes the names of all the output files, with spaces
        automatically placed around them.  You should write spaces
        around the %o as well or the results are undefined.
        %o is for use in the specs for running the linker.
        Input files whose names have no recognized suffix are not compiled
        at all, but they are included among the output files, so they will
        be linked.
 %O     substitutes the suffix for object files.  Note that this is
        handled specially when it immediately follows %g, %u, or %U
        (with or without a suffix argument) because of the need for
        those to form complete file names.  The handling is such that
        %O is treated exactly as if it had already been substituted,
        except that %g, %u, and %U do not currently support additional
        SUFFIX characters following %O as they would following, for
        example, `.o'.
 %p     substitutes the standard macro predefinitions for the
        current target machine.  Use this when running cpp.
 %P     like %p, but puts `__' before and after the name of each macro.
        (Except macros that already have __.)
        This is for ANSI C.
 %I     Substitute a -iprefix option made from GCC_EXEC_PREFIX.
 %s     current argument is the name of a library or startup file of some sort.
        Search for that file in a standard list of directories
        and substitute the full name found.
 %eSTR  Print STR as an error message.  STR is terminated by a newline.
        Use this when inconsistent options are detected.
 %nSTR  Print STR as an notice.  STR is terminated by a newline.
 %x{OPTION}     Accumulate an option for %X.
 %X     Output the accumulated linker options specified by compilations.
 %Y     Output the accumulated assembler options specified by compilations.
 %Z     Output the accumulated preprocessor options specified by compilations.
 %v1    Substitute the major version number of GCC.
        (For version 2.5.3, this is 2.)
 %v2    Substitute the minor version number of GCC.
        (For version 2.5.3, this is 5.)
 %v3    Substitute the patch level number of GCC.
        (For version 2.5.3, this is 3.)
 %a     process ASM_SPEC as a spec.
        This allows config.h to specify part of the spec for running as.
 %A     process ASM_FINAL_SPEC as a spec.  A capital A is actually
        used here.  This can be used to run a post-processor after the
        assembler has done its job.
 %D     Dump out a -L option for each directory in startfile_prefixes.
        If multilib_dir is set, extra entries are generated with it affixed.
 %l     process LINK_SPEC as a spec.
 %L     process LIB_SPEC as a spec.
 %G     process LIBGCC_SPEC as a spec.
 %M     output multilib_dir with directory separators replaced with "_";
        if multilib_dir is not set or is ".", output "".
 %S     process STARTFILE_SPEC as a spec.  A capital S is actually used here.
 %E     process ENDFILE_SPEC as a spec.  A capital E is actually used here.
 %C     process CPP_SPEC as a spec.
 %1     process CC1_SPEC as a spec.
 %2     process CC1PLUS_SPEC as a spec.
 %|     output "-" if the input for the current command is coming from a pipe.
 %*     substitute the variable part of a matched option.  (See below.)
        Note that each comma in the substituted string is replaced by
        a single space.
 %{S}   substitutes the -S switch, if that switch was given to CC.
        If that switch was not specified, this substitutes nothing.
        Here S is a metasyntactic variable.
 %{S*}  substitutes all the switches specified to CC whose names start
        with -S.  This is used for -o, -I, etc; switches that take
        arguments.  CC considers `-o foo' as being one switch whose
        name starts with `o'.  %{o*} would substitute this text,
        including the space; thus, two arguments would be generated.
 %{^S*} likewise, but don't put a blank between a switch and any args.
 %{S*&T*} likewise, but preserve order of S and T options (the order
        of S and T in the spec is not significant).  Can be any number
        of ampersand-separated variables; for each the wild card is
        optional.  Useful for CPP as %{D*&U*&A*}.
 %{S*:X} substitutes X if one or more switches whose names start with -S are
        specified to CC.  Note that the tail part of the -S option
        (i.e. the part matched by the `*') will be substituted for each
        occurrence of %* within X.
 %{<S}  remove all occurrences of -S from the command line.
        Note - this option is position dependent.  % commands in the
        spec string before this option will see -S, % commands in the
        spec string after this option will not.
 %{S:X} substitutes X, but only if the -S switch was given to CC.
 %{!S:X} substitutes X, but only if the -S switch was NOT given to CC.
 %{|S:X} like %{S:X}, but if no S switch, substitute `-'.
 %{|!S:X} like %{!S:X}, but if there is an S switch, substitute `-'.
 %{.S:X} substitutes X, but only if processing a file with suffix S.
 %{!.S:X} substitutes X, but only if NOT processing a file with suffix S.
 %{S|P:X} substitutes X if either -S or -P was given to CC.  This may be
          combined with ! and . as above binding stronger than the OR.
 %(Spec) processes a specification defined in a specs file as *Spec:
 %[Spec] as above, but put __ around -D arguments

The conditional text X in a %{S:X} or %{!S:X} construct may contain
other nested % constructs or spaces, or even newlines.  They are
processed as usual, as described above.

The -O, -f, -m, and -W switches are handled specifically in these
constructs.  If another value of -O or the negated form of a -f, -m, or
-W switch is found later in the command line, the earlier switch
value is ignored, except with {S*} where S is just one letter; this
passes all matching options.

The character | at the beginning of the predicate text is used to indicate
that a command should be piped to the following command, but only if -pipe
is specified.

Note that it is built into CC which switches take arguments and which
do not.  You might think it would be useful to generalize this to
allow each compiler's spec to say which switches take arguments.  But
this cannot be done in a consistent fashion.  CC cannot even decide
which input files have been specified without knowing which switches
take arguments, and it must know which input files to compile in order
to tell which compilers to run.

CC also knows implicitly that arguments starting in `-l' are to be
treated as compiler output files, and passed to the linker in their
proper position among the other output files.  */
\f
/* Define the macros used for specs %a, %l, %L, %S, %C, %1.  */

/* config.h can define ASM_SPEC to provide extra args to the assembler
   or extra switch-translations.  */
#ifndef ASM_SPEC
#define ASM_SPEC ""
#endif

/* config.h can define ASM_FINAL_SPEC to run a post processor after
   the assembler has run.  */
#ifndef ASM_FINAL_SPEC
#define ASM_FINAL_SPEC ""
#endif

/* config.h can define CPP_SPEC to provide extra args to the C preprocessor
   or extra switch-translations.  */
#ifndef CPP_SPEC
#define CPP_SPEC ""
#endif

/* config.h can define CC1_SPEC to provide extra args to cc1 and cc1plus
   or extra switch-translations.  */
#ifndef CC1_SPEC
#define CC1_SPEC ""
#endif

/* config.h can define CC1PLUS_SPEC to provide extra args to cc1plus
   or extra switch-translations.  */
#ifndef CC1PLUS_SPEC
#define CC1PLUS_SPEC ""
#endif

/* config.h can define LINK_SPEC to provide extra args to the linker
   or extra switch-translations.  */
#ifndef LINK_SPEC
#define LINK_SPEC ""
#endif

/* config.h can define LIB_SPEC to override the default libraries.  */
#ifndef LIB_SPEC
#define LIB_SPEC "%{!shared:%{g*:-lg} %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}"
#endif

/* config.h can define LIBGCC_SPEC to override how and when libgcc.a is
   included.  */
#ifndef LIBGCC_SPEC
#if defined(LINK_LIBGCC_SPECIAL) || defined(LINK_LIBGCC_SPECIAL_1)
/* Have gcc do the search for libgcc.a.  */
#define LIBGCC_SPEC "libgcc.a%s"
#else
#define LIBGCC_SPEC "-lgcc"
#endif
#endif

/* config.h can define STARTFILE_SPEC to override the default crt0 files.  */
#ifndef STARTFILE_SPEC
#define STARTFILE_SPEC  \
  "%{!shared:%{pg:gcrt0%O%s}%{!pg:%{p:mcrt0%O%s}%{!p:crt0%O%s}}}"
#endif

/* config.h can define SWITCHES_NEED_SPACES to control which options
   require spaces between the option and the argument.  */
#ifndef SWITCHES_NEED_SPACES
#define SWITCHES_NEED_SPACES ""
#endif

/* config.h can define ENDFILE_SPEC to override the default crtn files.  */
#ifndef ENDFILE_SPEC
#define ENDFILE_SPEC ""
#endif

#ifndef LINKER_NAME
#define LINKER_NAME "collect2"
#endif

/* Define ASM_DEBUG_SPEC to be a spec suitable for translating '-g'
   to the assembler.  */
#ifndef ASM_DEBUG_SPEC
# if defined(DBX_DEBUGGING_INFO) && defined(DWARF2_DEBUGGING_INFO) \
     && defined(HAVE_AS_GDWARF2_DEBUG_FLAG) && defined(HAVE_AS_GSTABS_DEBUG_FLAG)
#  define ASM_DEBUG_SPEC                                        \
      (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG                    \
       ? "%{gdwarf-2*:--gdwarf2}%{!gdwarf-2*:%{g*:--gstabs}}"   \
       : "%{gstabs*:--gstabs}%{!gstabs*:%{g*:--gdwarf2}}")
# else
#  if defined(DBX_DEBUGGING_INFO) && defined(HAVE_AS_GSTABS_DEBUG_FLAG)
#   define ASM_DEBUG_SPEC "%{g*:--gstabs}"
#  endif
#  if defined(DWARF2_DEBUGGING_INFO) && defined(HAVE_AS_GDWARF2_DEBUG_FLAG)
#   define ASM_DEBUG_SPEC "%{g*:--gdwarf2}"
#  endif
# endif
#endif
#ifndef ASM_DEBUG_SPEC
# define ASM_DEBUG_SPEC ""
#endif

/* Here is the spec for running the linker, after compiling all files.  */

/* This is overridable by the target in case they need to specify the
   -lgcc and -lc order specially, yet not require them to override all
   of LINK_COMMAND_SPEC.  */
#ifndef LINK_GCC_C_SEQUENCE_SPEC
#define LINK_GCC_C_SEQUENCE_SPEC "%G %L %G"
#endif

/* -u* was put back because both BSD and SysV seem to support it.  */
/* %{static:} simply prevents an error message if the target machine
   doesn't handle -static.  */
/* We want %{T*} after %{L*} and %D so that it can be used to specify linker
   scripts which exist in user specified directories, or in standard
   directories.  */
#ifndef LINK_COMMAND_SPEC
#define LINK_COMMAND_SPEC "\
%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
    %(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} %{r} %{s} %{t}\
    %{u*} %{x} %{z} %{Z} %{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
    %{static:} %{L*} %(link_libgcc) %o %{!nostdlib:%{!nodefaultlibs:%(link_gcc_c_sequence)}}\
    %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} }}}}}}"
#endif

#ifndef LINK_LIBGCC_SPEC
# ifdef LINK_LIBGCC_SPECIAL
/* Don't generate -L options for startfile prefix list.  */
#  define LINK_LIBGCC_SPEC ""
# else
/* Do generate them.  */
#  define LINK_LIBGCC_SPEC "%D"
# endif
#endif

static const char *asm_debug = ASM_DEBUG_SPEC;
static const char *cpp_spec = CPP_SPEC;
static const char *cpp_predefines = CPP_PREDEFINES;
static const char *cc1_spec = CC1_SPEC;
static const char *cc1plus_spec = CC1PLUS_SPEC;
static const char *link_gcc_c_sequence_spec = LINK_GCC_C_SEQUENCE_SPEC;
static const char *asm_spec = ASM_SPEC;
static const char *asm_final_spec = ASM_FINAL_SPEC;
static const char *link_spec = LINK_SPEC;
static const char *lib_spec = LIB_SPEC;
static const char *libgcc_spec = LIBGCC_SPEC;
static const char *endfile_spec = ENDFILE_SPEC;
static const char *startfile_spec = STARTFILE_SPEC;
static const char *switches_need_spaces = SWITCHES_NEED_SPACES;
static const char *linker_name_spec = LINKER_NAME;
static const char *link_command_spec = LINK_COMMAND_SPEC;
static const char *link_libgcc_spec = LINK_LIBGCC_SPEC;

/* Standard options to cpp, cc1, and as, to reduce duplication in specs.
   There should be no need to override these in target dependent files,
   but we need to copy them to the specs file so that newer versions
   of the GCC driver can correctly drive older tool chains with the
   appropriate -B options.  */

static const char *trad_capable_cpp =
"%{traditional|ftraditional|traditional-cpp:tradcpp0}\
 %{!traditional:%{!ftraditional:%{!traditional-cpp:cc1 -E}}}";

static const char *cpp_unique_options =
"%{C:%{!E:%eGNU C does not support -C without using -E}}\
 %{CC:%{!E:%eGNU C does not support -CC without using -E}}\
 %{!Q:-quiet} %{nostdinc*} %{C} %{CC} %{v} %{I*} %{P} %{$} %I\
 %{MD:-MD %W{!o: %b.d}%W{o*:%.d%*}}\
 %{MMD:-MMD %W{!o: %b.d}%W{o*:%.d%*}}\
 %{M} %{MM} %W{MF*} %{MG} %{MP} %{MQ*} %{MT*}\
 %{!E:%{!M:%{!MM:%{MD|MMD:%{o*:-MQ %*}}}}}\
 %{!no-gcc:-D__GNUC__=%v1 -D__GNUC_MINOR__=%v2 -D__GNUC_PATCHLEVEL__=%v3}\
 %{!undef:%{!ansi:%{!std=*:%p}%{std=gnu*:%p}} %P} %{trigraphs}\
 %{Os:-D__OPTIMIZE_SIZE__} %{O*:%{!O0:-D__OPTIMIZE__}}\
 %{fno-inline|O0|!O*:-D__NO_INLINE__} %{ffast-math:-D__FAST_MATH__}\
 %{fshort-wchar:-U__WCHAR_TYPE__ -D__WCHAR_TYPE__=short\\ unsigned\\ int}\
 %{ffreestanding:-D__STDC_HOSTED__=0} %{fno-hosted:-D__STDC_HOSTED__=0}\
 %{!ffreestanding:%{!fno-hosted:-D__STDC_HOSTED__=1}} %{remap}\
 %{g3:-dD} %{H} %C %{D*&U*&A*} %{i*} %Z %i\
 %{E|M|MM:%W{o*}}";

/* This contains cpp options which are common with cc1_options and are passed
   only when preprocessing only to avoid duplication.  */
static const char *cpp_options =
"%(cpp_unique_options) %{std*} %{d*} %{W*&pedantic*} %{w}\
 %{fshow-column} %{fno-show-column}\
 %{fsigned-char&funsigned-char}\
 %{fleading-underscore} %{fno-leading-underscore}\
 %{fno-operator-names} %{ftabstop=*}";

/* NB: This is shared amongst all front-ends.  */
static const char *cc1_options =
"%{pg:%{fomit-frame-pointer:%e-pg and -fomit-frame-pointer are incompatible}}\
 %1 %{!Q:-quiet} -dumpbase %B %{d*} %{m*} %{a*}\
 %{g*} %{O*} %{W*&pedantic*} %{w} %{std*} %{ansi}\
 %{v:-version} %{pg:-p} %{p} %{f*}\
 %{Qn:-fno-ident} %{--help:--help}\
 %{--target-help:--target-help}\
 %{!fsyntax-only:%{S:%W{o*}%{!o*:-o %b.s}}}\
 %{fsyntax-only:-o %j} %{-param*}";

static const char *asm_options =
"%a %Y %{c:%W{o*}%{!o*:-o %w%b%O}}%{!c:-o %d%w%u%O}";

static const char *invoke_as =
"%{!S:-o %{|!pipe:%g.s} |\n as %(asm_options) %{!pipe:%g.s} %A }";

/* Some compilers have limits on line lengths, and the multilib_select
   and/or multilib_matches strings can be very long, so we build them at
   run time.  */
static struct obstack multilib_obstack;
static const char *multilib_select;
static const char *multilib_matches;
static const char *multilib_defaults;
static const char *multilib_exclusions;
#include "multilib.h"

/* Check whether a particular argument is a default argument.  */

#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS { "" }
#endif

static const char *const multilib_defaults_raw[] = MULTILIB_DEFAULTS;

struct user_specs
{
  struct user_specs *next;
  const char *filename;
};

static struct user_specs *user_specs_head, *user_specs_tail;

/* This defines which switch letters take arguments.  */

#define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
  ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
   || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
   || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
   || (CHAR) == 'L' || (CHAR) == 'A' || (CHAR) == 'V' \
   || (CHAR) == 'B' || (CHAR) == 'b')

#ifndef SWITCH_TAKES_ARG
#define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
#endif

/* This defines which multi-letter switches take arguments.  */

#define DEFAULT_WORD_SWITCH_TAKES_ARG(STR)              \
 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext")      \
  || !strcmp (STR, "Tbss") || !strcmp (STR, "include")  \
  || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
  || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
  || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
  || !strcmp (STR, "isystem") || !strcmp (STR, "-param") \
  || !strcmp (STR, "specs") \
  || !strcmp (STR, "MF") || !strcmp (STR, "MT") || !strcmp (STR, "MQ"))

#ifndef WORD_SWITCH_TAKES_ARG
#define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
#endif
\f
#ifdef HAVE_TARGET_EXECUTABLE_SUFFIX
/* This defines which switches stop a full compilation.  */
#define DEFAULT_SWITCH_CURTAILS_COMPILATION(CHAR) \
  ((CHAR) == 'c' || (CHAR) == 'S')

#ifndef SWITCH_CURTAILS_COMPILATION
#define SWITCH_CURTAILS_COMPILATION(CHAR) \
  DEFAULT_SWITCH_CURTAILS_COMPILATION(CHAR)
#endif
#endif

/* Record the mapping from file suffixes for compilation specs.  */

struct compiler
{
  const char *suffix;           /* Use this compiler for input files
                                   whose names end in this suffix.  */

  const char *spec;             /* To use this compiler, run this spec.  */

  const char *cpp_spec;         /* If non-NULL, substitute this spec
                                   for `%C', rather than the usual
                                   cpp_spec.  */
};

/* Pointer to a vector of `struct compiler' that gives the spec for
   compiling a file, based on its suffix.
   A file that does not end in any of these suffixes will be passed
   unchanged to the loader and nothing else will be done to it.

   An entry containing two 0s is used to terminate the vector.

   If multiple entries match a file, the last matching one is used.  */

static struct compiler *compilers;

/* Number of entries in `compilers', not counting the null terminator.  */

static int n_compilers;

/* The default list of file name suffixes and their compilation specs.  */

static const struct compiler default_compilers[] =
{
  /* Add lists of suffixes of known languages here.  If those languages
     were not present when we built the driver, we will hit these copies
     and be given a more meaningful error than "file not used since
     linking is not done".  */
  {".m",  "#Objective-C", 0}, {".mi",  "#Objective-C", 0},
  {".cc", "#C++", 0}, {".cxx", "#C++", 0}, {".cpp", "#C++", 0},
  {".cp", "#C++", 0}, {".c++", "#C++", 0}, {".C", "#C++", 0},
  {".ii", "#C++", 0},
  {".ads", "#Ada", 0}, {".adb", "#Ada", 0},
  {".f", "#Fortran", 0}, {".for", "#Fortran", 0}, {".fpp", "#Fortran", 0},
  {".F", "#Fortran", 0}, {".FOR", "#Fortran", 0}, {".FPP", "#Fortran", 0},
  {".r", "#Ratfor", 0},
  {".p", "#Pascal", 0}, {".pas", "#Pascal", 0},
  {".java", "#Java", 0}, {".class", "#Java", 0},
  {".zip", "#Java", 0}, {".jar", "#Java", 0},
  /* Next come the entries for C.  */
  {".c", "@c", 0},
  {"@c",
   /* cc1 has an integrated ISO C preprocessor.  We should invoke the
      external preprocessor if -save-temps is given.  */
     "%{E|M|MM:%(trad_capable_cpp) -lang-c %{ansi:-std=c89} %(cpp_options)}\
      %{!E:%{!M:%{!MM:\
          %{traditional|ftraditional:\
%eGNU C no longer supports -traditional without -E}\
          %{save-temps|traditional-cpp:%(trad_capable_cpp) \
                -lang-c %{ansi:-std=c89} %(cpp_options) %b.i \n\
                    cc1 -fpreprocessed %b.i %(cc1_options)}\
          %{!save-temps:%{!traditional-cpp:\
                cc1 -lang-c %{ansi:-std=c89} %(cpp_unique_options) %(cc1_options)}}\
        %{!fsyntax-only:%(invoke_as)}}}}", 0},
  {"-",
   "%{!E:%e-E required when input is from standard input}\
    %(trad_capable_cpp) -lang-c %{ansi:-std=c89} %(cpp_options)", 0},
  {".h", "@c-header", 0},
  {"@c-header",
   "%{!E:%ecompilation of header file requested} \
    %(trad_capable_cpp) -lang-c %{ansi:-std=c89} %(cpp_options)", 0},
  {".i", "@cpp-output", 0},
  {"@cpp-output",
   "%{!M:%{!MM:%{!E:cc1 -fpreprocessed %i %(cc1_options) %{!fsyntax-only:%(invoke_as)}}}}", 0},
  {".s", "@assembler", 0},
  {"@assembler",
   "%{!M:%{!MM:%{!E:%{!S:as %(asm_debug) %(asm_options) %i %A }}}}", 0},
  {".S", "@assembler-with-cpp", 0},
  {"@assembler-with-cpp",
   "%(trad_capable_cpp) -lang-asm %(cpp_options)\
      %{!M:%{!MM:%{!E:%{!S:-o %{|!pipe:%g.s} |\n\
       as %(asm_debug) %(asm_options) %{!pipe:%g.s} %A }}}}", 0},
#include "specs.h"
  /* Mark end of table */
  {0, 0, 0}
};

/* Number of elements in default_compilers, not counting the terminator.  */

static const int n_default_compilers = ARRAY_SIZE (default_compilers) - 1;

/* A vector of options to give to the linker.
   These options are accumulated by %x,
   and substituted into the linker command with %X.  */
static int n_linker_options;
static char **linker_options;

/* A vector of options to give to the assembler.
   These options are accumulated by -Wa,
   and substituted into the assembler command with %Y.  */
static int n_assembler_options;
static char **assembler_options;

/* A vector of options to give to the preprocessor.
   These options are accumulated by -Wp,
   and substituted into the preprocessor command with %Z.  */
static int n_preprocessor_options;
static char **preprocessor_options;
\f
/* Define how to map long options into short ones.  */

/* This structure describes one mapping.  */
struct option_map
{
  /* The long option's name.  */
  const char *const name;
  /* The equivalent short option.  */
  const char *const equivalent;
  /* Argument info.  A string of flag chars; NULL equals no options.
     a => argument required.
     o => argument optional.
     j => join argument to equivalent, making one word.
     * => require other text after NAME as an argument.  */
  const char *const arg_info;
};

/* This is the table of mappings.  Mappings are tried sequentially
   for each option encountered; the first one that matches, wins.  */

static const struct option_map option_map[] =
 {
   {"--all-warnings", "-Wall", 0},
   {"--ansi", "-ansi", 0},
   {"--assemble", "-S", 0},
   {"--assert", "-A", "a"},
   {"--classpath", "-fclasspath=", "aj"},
   {"--bootclasspath", "-fbootclasspath=", "aj"},
   {"--CLASSPATH", "-fclasspath=", "aj"},
   {"--comments", "-C", 0},
   {"--comments-in-macros", "-CC", 0},
   {"--compile", "-c", 0},
   {"--debug", "-g", "oj"},
   {"--define-macro", "-D", "aj"},
   {"--dependencies", "-M", 0},
   {"--dump", "-d", "a"},
   {"--dumpbase", "-dumpbase", "a"},
   {"--entry", "-e", 0},
   {"--extra-warnings", "-W", 0},
   {"--for-assembler", "-Wa", "a"},
   {"--for-linker", "-Xlinker", "a"},
   {"--force-link", "-u", "a"},
   {"--imacros", "-imacros", "a"},
   {"--include", "-include", "a"},
   {"--include-barrier", "-I-", 0},
   {"--include-directory", "-I", "aj"},
   {"--include-directory-after", "-idirafter", "a"},
   {"--include-prefix", "-iprefix", "a"},
   {"--include-with-prefix", "-iwithprefix", "a"},
   {"--include-with-prefix-before", "-iwithprefixbefore", "a"},
   {"--include-with-prefix-after", "-iwithprefix", "a"},
   {"--language", "-x", "a"},
   {"--library-directory", "-L", "a"},
   {"--machine", "-m", "aj"},
   {"--machine-", "-m", "*j"},
   {"--no-line-commands", "-P", 0},
   {"--no-precompiled-includes", "-noprecomp", 0},
   {"--no-standard-includes", "-nostdinc", 0},
   {"--no-standard-libraries", "-nostdlib", 0},
   {"--no-warnings", "-w", 0},
   {"--optimize", "-O", "oj"},
   {"--output", "-o", "a"},
   {"--output-class-directory", "-foutput-class-dir=", "ja"},
   {"--param", "--param", "a"},
   {"--pedantic", "-pedantic", 0},
   {"--pedantic-errors", "-pedantic-errors", 0},
   {"--pipe", "-pipe", 0},
   {"--prefix", "-B", "a"},
   {"--preprocess", "-E", 0},
   {"--print-search-dirs", "-print-search-dirs", 0},
   {"--print-file-name", "-print-file-name=", "aj"},
   {"--print-libgcc-file-name", "-print-libgcc-file-name", 0},
   {"--print-missing-file-dependencies", "-MG", 0},
   {"--print-multi-lib", "-print-multi-lib", 0},
   {"--print-multi-directory", "-print-multi-directory", 0},
   {"--print-prog-name", "-print-prog-name=", "aj"},
   {"--profile", "-p", 0},
   {"--profile-blocks", "-a", 0},
   {"--quiet", "-q", 0},
   {"--save-temps", "-save-temps", 0},
   {"--shared", "-shared", 0},
   {"--silent", "-q", 0},
   {"--specs", "-specs=", "aj"},
   {"--static", "-static", 0},
   {"--std", "-std=", "aj"},
   {"--symbolic", "-symbolic", 0},
   {"--target", "-b", "a"},
   {"--time", "-time", 0},
   {"--trace-includes", "-H", 0},
   {"--traditional", "-traditional", 0},
   {"--traditional-cpp", "-traditional-cpp", 0},
   {"--trigraphs", "-trigraphs", 0},
   {"--undefine-macro", "-U", "aj"},
   {"--use-version", "-V", "a"},
   {"--user-dependencies", "-MM", 0},
   {"--verbose", "-v", 0},
   {"--warn-", "-W", "*j"},
   {"--write-dependencies", "-MD", 0},
   {"--write-user-dependencies", "-MMD", 0},
   {"--", "-f", "*j"}
 };
\f

#ifdef TARGET_OPTION_TRANSLATE_TABLE
static const struct {
  const char *const option_found;
  const char *const replacements;
} target_option_translations[] =
{
  TARGET_OPTION_TRANSLATE_TABLE,
  { 0, 0 }
};
#endif

/* Translate the options described by *ARGCP and *ARGVP.
   Make a new vector and store it back in *ARGVP,
   and store its length in *ARGVC.  */

static void
translate_options (argcp, argvp)
     int *argcp;
     const char *const **argvp;
{
  int i;
  int argc = *argcp;
  const char *const *argv = *argvp;
  int newvsize = (argc + 2) * 2 * sizeof (const char *);
  const char **newv =
    (const char **) xmalloc (newvsize);
  int newindex = 0;

  i = 0;
  newv[newindex++] = argv[i++];

  while (i < argc)
    {
#ifdef TARGET_OPTION_TRANSLATE_TABLE
      int tott_idx;

      for (tott_idx = 0;
           target_option_translations[tott_idx].option_found;
           tott_idx++)
        {
          if (strcmp (target_option_translations[tott_idx].option_found,
                      argv[i]) == 0)
            {
              int spaces = 1;
              const char *sp;
              char *np;

              for (sp = target_option_translations[tott_idx].replacements;
                   *sp; sp++)
                {
                  if (*sp == ' ')
                    spaces ++;
                }

              newvsize += spaces * sizeof (const char *);
              newv = (const char **) xrealloc (newv, newvsize);

              sp = target_option_translations[tott_idx].replacements;
              np = xstrdup (sp);

              while (1)
                {
                  while (*np == ' ')
                    np++;
                  if (*np == 0)
                    break;
                  newv[newindex++] = np;
                  while (*np != ' ' && *np)
                    np++;
                  if (*np == 0)
                    break;
                  *np++ = 0;
                }

              i ++;
              break;
            }
        }
      if (target_option_translations[tott_idx].option_found)
        continue;
#endif

      /* Translate -- options.  */
      if (argv[i][0] == '-' && argv[i][1] == '-')
        {
          size_t j;
          /* Find a mapping that applies to this option.  */
          for (j = 0; j < ARRAY_SIZE (option_map); j++)
            {
              size_t optlen = strlen (option_map[j].name);
              size_t arglen = strlen (argv[i]);
              size_t complen = arglen > optlen ? optlen : arglen;
              const char *arginfo = option_map[j].arg_info;

              if (arginfo == 0)
                arginfo = "";

              if (!strncmp (argv[i], option_map[j].name, complen))
                {
                  const char *arg = 0;

                  if (arglen < optlen)
                    {
                      size_t k;
                      for (k = j + 1; k < ARRAY_SIZE (option_map); k++)
                        if (strlen (option_map[k].name) >= arglen
                            && !strncmp (argv[i], option_map[k].name, arglen))
                          {
                            error ("ambiguous abbreviation %s", argv[i]);
                            break;
                          }

                      if (k != ARRAY_SIZE (option_map))
                        break;
                    }

                  if (arglen > optlen)
                    {
                      /* If the option has an argument, accept that.  */
                      if (argv[i][optlen] == '=')
                        arg = argv[i] + optlen + 1;

                      /* If this mapping requires extra text at end of name,
                         accept that as "argument".  */
                      else if (strchr (arginfo, '*') != 0)
                        arg = argv[i] + optlen;

                      /* Otherwise, extra text at end means mismatch.
                         Try other mappings.  */
                      else
                        continue;
                    }

                  else if (strchr (arginfo, '*') != 0)
                    {
                      error ("incomplete `%s' option", option_map[j].name);
                      break;
                    }

                  /* Handle arguments.  */
                  if (strchr (arginfo, 'a') != 0)
                    {
                      if (arg == 0)
                        {
                          if (i + 1 == argc)
                            {
                              error ("missing argument to `%s' option",
                                     option_map[j].name);
                              break;
                            }

                          arg = argv[++i];
                        }
                    }
                  else if (strchr (arginfo, '*') != 0)
                    ;
                  else if (strchr (arginfo, 'o') == 0)
                    {
                      if (arg != 0)
                        error ("extraneous argument to `%s' option",
                               option_map[j].name);
                      arg = 0;
                    }

                  /* Store the translation as one argv elt or as two.  */
                  if (arg != 0 && strchr (arginfo, 'j') != 0)
                    newv[newindex++] = concat (option_map[j].equivalent, arg,
                                               NULL);
                  else if (arg != 0)
                    {
                      newv[newindex++] = option_map[j].equivalent;
                      newv[newindex++] = arg;
                    }
                  else
                    newv[newindex++] = option_map[j].equivalent;

                  break;
                }
            }
          i++;
        }

      /* Handle old-fashioned options--just copy them through,
         with their arguments.  */
      else if (argv[i][0] == '-')
        {
          const char *p = argv[i] + 1;
          int c = *p;
          int nskip = 1;

          if (SWITCH_TAKES_ARG (c) > (p[1] != 0))
            nskip += SWITCH_TAKES_ARG (c) - (p[1] != 0);
          else if (WORD_SWITCH_TAKES_ARG (p))
            nskip += WORD_SWITCH_TAKES_ARG (p);
          else if ((c == 'B' || c == 'b' || c == 'V' || c == 'x')
                   && p[1] == 0)
            nskip += 1;
          else if (! strcmp (p, "Xlinker"))
            nskip += 1;

          /* Watch out for an option at the end of the command line that
             is missing arguments, and avoid skipping past the end of the
             command line.  */
          if (nskip + i > argc)
            nskip = argc - i;

          while (nskip > 0)
            {
              newv[newindex++] = argv[i++];
              nskip--;
            }
        }
      else
        /* Ordinary operands, or +e options.  */
        newv[newindex++] = argv[i++];
    }

  newv[newindex] = 0;

  *argvp = newv;
  *argcp = newindex;
}
\f
static char *
skip_whitespace (p)
     char *p;
{
  while (1)
    {
      /* A fully-blank line is a delimiter in the SPEC file and shouldn't
         be considered whitespace.  */
      if (p[0] == '\n' && p[1] == '\n' && p[2] == '\n')
        return p + 1;
      else if (*p == '\n' || *p == ' ' || *p == '\t')
        p++;
      else if (*p == '#')
        {
          while (*p != '\n')
            p++;
          p++;
        }
      else
        break;
    }

  return p;
}
/* Structures to keep track of prefixes to try when looking for files.  */

struct prefix_list
{
  const char *prefix;         /* String to prepend to the path.  */
  struct prefix_list *next;   /* Next in linked list.  */
  int require_machine_suffix; /* Don't use without machine_suffix.  */
  /* 2 means try both machine_suffix and just_machine_suffix.  */
  int *used_flag_ptr;         /* 1 if a file was found with this prefix.  */
  int priority;               /* Sort key - priority within list */
};

struct path_prefix
{
  struct prefix_list *plist;  /* List of prefixes to try */
  int max_len;                /* Max length of a prefix in PLIST */
  const char *name;           /* Name of this list (used in config stuff) */
};

/* List of prefixes to try when looking for executables.  */

static struct path_prefix exec_prefixes = { 0, 0, "exec" };

/* List of prefixes to try when looking for startup (crt0) files.  */

static struct path_prefix startfile_prefixes = { 0, 0, "startfile" };

/* List of prefixes to try when looking for include files.  */

static struct path_prefix include_prefixes = { 0, 0, "include" };

/* Suffix to attach to directories searched for commands.
   This looks like `MACHINE/VERSION/'.  */

static const char *machine_suffix = 0;

/* Suffix to attach to directories searched for commands.
   This is just `MACHINE/'.  */

static const char *just_machine_suffix = 0;

/* Adjusted value of GCC_EXEC_PREFIX envvar.  */

static const char *gcc_exec_prefix;

/* Default prefixes to attach to command names.  */

#ifdef CROSS_COMPILE  /* Don't use these prefixes for a cross compiler.  */
#undef MD_EXEC_PREFIX
#undef MD_STARTFILE_PREFIX
#undef MD_STARTFILE_PREFIX_1
#endif

/* If no prefixes defined, use the null string, which will disable them.  */
#ifndef MD_EXEC_PREFIX
#define MD_EXEC_PREFIX ""
#endif
#ifndef MD_STARTFILE_PREFIX
#define MD_STARTFILE_PREFIX ""
#endif
#ifndef MD_STARTFILE_PREFIX_1
#define MD_STARTFILE_PREFIX_1 ""
#endif

/* Supply defaults for the standard prefixes.  */

#ifndef STANDARD_EXEC_PREFIX
#define STANDARD_EXEC_PREFIX "/usr/local/lib/gcc-lib/"
#endif
#ifndef STANDARD_STARTFILE_PREFIX
#define STANDARD_STARTFILE_PREFIX "/usr/local/lib/"
#endif
#ifndef TOOLDIR_BASE_PREFIX
#define TOOLDIR_BASE_PREFIX "/usr/local/"
#endif
#ifndef STANDARD_BINDIR_PREFIX
#define STANDARD_BINDIR_PREFIX "/usr/local/bin"
#endif

static const char *const standard_exec_prefix = STANDARD_EXEC_PREFIX;
static const char *const standard_exec_prefix_1 = "/usr/lib/gcc/";
static const char *md_exec_prefix = MD_EXEC_PREFIX;

static const char *md_startfile_prefix = MD_STARTFILE_PREFIX;
static const char *md_startfile_prefix_1 = MD_STARTFILE_PREFIX_1;
static const char *const standard_startfile_prefix = STANDARD_STARTFILE_PREFIX;
static const char *const standard_startfile_prefix_1 = "/lib/";
static const char *const standard_startfile_prefix_2 = "/usr/lib/";

static const char *const tooldir_base_prefix = TOOLDIR_BASE_PREFIX;
static const char *tooldir_prefix;

static const char *const standard_bindir_prefix = STANDARD_BINDIR_PREFIX;

/* Subdirectory to use for locating libraries.  Set by
   set_multilib_dir based on the compilation options.  */

static const char *multilib_dir;
\f
/* Structure to keep track of the specs that have been defined so far.
   These are accessed using %(specname) or %[specname] in a compiler
   or link spec.  */

struct spec_list
{
                                /* The following 2 fields must be first */
                                /* to allow EXTRA_SPECS to be initialized */
  const char *name;             /* name of the spec.  */
  const char *ptr;              /* available ptr if no static pointer */

                                /* The following fields are not initialized */
                                /* by EXTRA_SPECS */
  const char **ptr_spec;        /* pointer to the spec itself.  */
  struct spec_list *next;       /* Next spec in linked list.  */
  int name_len;                 /* length of the name */
  int alloc_p;                  /* whether string was allocated */
};

#define INIT_STATIC_SPEC(NAME,PTR) \
{ NAME, NULL, PTR, (struct spec_list *) 0, sizeof (NAME) - 1, 0 }

/* List of statically defined specs.  */
static struct spec_list static_specs[] =
{
  INIT_STATIC_SPEC ("asm",                      &asm_spec),
  INIT_STATIC_SPEC ("asm_debug",                &asm_debug),
  INIT_STATIC_SPEC ("asm_final",                &asm_final_spec),
  INIT_STATIC_SPEC ("asm_options",              &asm_options),
  INIT_STATIC_SPEC ("invoke_as",                &invoke_as),
  INIT_STATIC_SPEC ("cpp",                      &cpp_spec),
  INIT_STATIC_SPEC ("cpp_options",              &cpp_options),
  INIT_STATIC_SPEC ("cpp_unique_options",       &cpp_unique_options),
  INIT_STATIC_SPEC ("trad_capable_cpp",         &trad_capable_cpp),
  INIT_STATIC_SPEC ("cc1",                      &cc1_spec),
  INIT_STATIC_SPEC ("cc1_options",              &cc1_options),
  INIT_STATIC_SPEC ("cc1plus",                  &cc1plus_spec),
  INIT_STATIC_SPEC ("link_gcc_c_sequence",      &link_gcc_c_sequence_spec),
  INIT_STATIC_SPEC ("endfile",                  &endfile_spec),
  INIT_STATIC_SPEC ("link",                     &link_spec),
  INIT_STATIC_SPEC ("lib",                      &lib_spec),
  INIT_STATIC_SPEC ("libgcc",                   &libgcc_spec),
  INIT_STATIC_SPEC ("startfile",                &startfile_spec),
  INIT_STATIC_SPEC ("switches_need_spaces",     &switches_need_spaces),
  INIT_STATIC_SPEC ("predefines",               &cpp_predefines),
  INIT_STATIC_SPEC ("cross_compile",            &cross_compile),
  INIT_STATIC_SPEC ("version",                  &compiler_version),
  INIT_STATIC_SPEC ("multilib",                 &multilib_select),
  INIT_STATIC_SPEC ("multilib_defaults",        &multilib_defaults),
  INIT_STATIC_SPEC ("multilib_extra",           &multilib_extra),
  INIT_STATIC_SPEC ("multilib_matches",         &multilib_matches),
  INIT_STATIC_SPEC ("multilib_exclusions",      &multilib_exclusions),
  INIT_STATIC_SPEC ("linker",                   &linker_name_spec),
  INIT_STATIC_SPEC ("link_libgcc",              &link_libgcc_spec),
  INIT_STATIC_SPEC ("md_exec_prefix",           &md_exec_prefix),
  INIT_STATIC_SPEC ("md_startfile_prefix",      &md_startfile_prefix),
  INIT_STATIC_SPEC ("md_startfile_prefix_1",    &md_startfile_prefix_1),
};

#ifdef EXTRA_SPECS              /* additional specs needed */
/* Structure to keep track of just the first two args of a spec_list.
   That is all that the EXTRA_SPECS macro gives us.  */
struct spec_list_1
{
  const char *const name;
  const char *const ptr;
};

static const struct spec_list_1 extra_specs_1[] = { EXTRA_SPECS };
static struct spec_list *extra_specs = (struct spec_list *) 0;
#endif

/* List of dynamically allocates specs that have been defined so far.  */

static struct spec_list *specs = (struct spec_list *) 0;
\f
/* Add appropriate libgcc specs to OBSTACK, taking into account
   various permutations of -shared-libgcc, -shared, and such.  */

#ifdef ENABLE_SHARED_LIBGCC
static void
init_gcc_specs (obstack, shared_name, static_name, eh_name)
     struct obstack *obstack;
     const char *shared_name;
     const char *static_name;
     const char *eh_name;
{
  char *buf;

  buf = concat ("%{static|static-libgcc:", static_name, " ", eh_name,
                "}%{!static:%{!static-libgcc:",
                "%{!shared:%{!shared-libgcc:", static_name, " ",
                eh_name, "}%{shared-libgcc:", shared_name, " ",
                static_name, "}}%{shared:",
#ifdef LINK_EH_SPEC
                "%{shared-libgcc:", shared_name,
                "}%{!shared-libgcc:", static_name, "}",
#else
                shared_name,
#endif
                "}}}", NULL);

  obstack_grow (obstack, buf, strlen (buf));
  free (buf);
}
#endif /* ENABLE_SHARED_LIBGCC */

/* Initialize the specs lookup routines.  */

static void
init_spec ()
{
  struct spec_list *next = (struct spec_list *) 0;
  struct spec_list *sl   = (struct spec_list *) 0;
  int i;

  if (specs)
    return;                     /* Already initialized.  */

  if (verbose_flag)
    notice ("Using built-in specs.\n");

#ifdef EXTRA_SPECS
  extra_specs = (struct spec_list *)
    xcalloc (sizeof (struct spec_list), ARRAY_SIZE (extra_specs_1));

  for (i = ARRAY_SIZE (extra_specs_1) - 1; i >= 0; i--)
    {
      sl = &extra_specs[i];
      sl->name = extra_specs_1[i].name;
      sl->ptr = extra_specs_1[i].ptr;
      sl->next = next;
      sl->name_len = strlen (sl->name);
      sl->ptr_spec = &sl->ptr;
      next = sl;
    }
#endif

  for (i = ARRAY_SIZE (static_specs) - 1; i >= 0; i--)
    {
      sl = &static_specs[i];
      sl->next = next;
      next = sl;
    }

#ifdef ENABLE_SHARED_LIBGCC
  /* ??? If neither -shared-libgcc nor --static-libgcc was
     seen, then we should be making an educated guess.  Some proposed
     heuristics for ELF include:

        (1) If "-Wl,--export-dynamic", then it's a fair bet that the
            program will be doing dynamic loading, which will likely
            need the shared libgcc.

        (2) If "-ldl", then it's also a fair bet that we're doing
            dynamic loading.

        (3) For each ET_DYN we're linking against (either through -lfoo
            or /some/path/foo.so), check to see whether it or one of
            its dependencies depends on a shared libgcc.

        (4) If "-shared"

            If the runtime is fixed to look for program headers instead
            of calling __register_frame_info at all, for each object,
            use the shared libgcc if any EH symbol referenced.

            If crtstuff is fixed to not invoke __register_frame_info
            automatically, for each object, use the shared libgcc if
            any non-empty unwind section found.

     Doing any of this probably requires invoking an external program to
     do the actual object file scanning.  */
  {
    const char *p = libgcc_spec;
    int in_sep = 1;
 
    /* Transform the extant libgcc_spec into one that uses the shared libgcc
       when given the proper command line arguments.  */
    while (*p)
      {
        if (in_sep && *p == '-' && strncmp (p, "-lgcc", 5) == 0)
          {
            init_gcc_specs (&obstack,
#ifdef NO_SHARED_LIBGCC_MULTILIB
                            "-lgcc_s"
#else
                            "-lgcc_s%M"
#endif
                            ,
                            "-lgcc",
                            "-lgcc_eh");
            p += 5;
            in_sep = 0;
          }
        else if (in_sep && *p == 'l' && strncmp (p, "libgcc.a%s", 10) == 0)
          {
            /* Ug.  We don't know shared library extensions.  Hope that
               systems that use this form don't do shared libraries.  */
            init_gcc_specs (&obstack,
#ifdef NO_SHARED_LIBGCC_MULTILIB
                            "-lgcc_s"
#else
                            "-lgcc_s%M"
#endif
                            ,
                            "libgcc.a%s",
                            "libgcc_eh.a%s");
            p += 10;
            in_sep = 0;
          }
        else
          {
            obstack_1grow (&obstack, *p);
            in_sep = (*p == ' ');
            p += 1;
          }
      }

    obstack_1grow (&obstack, '\0');
    libgcc_spec = obstack_finish (&obstack);
  }
#endif
#ifdef USE_AS_TRADITIONAL_FORMAT
  /* Prepend "--traditional-format" to whatever asm_spec we had before.  */
  {
    static const char tf[] = "--traditional-format ";
    obstack_grow (&obstack, tf, sizeof(tf) - 1);
    obstack_grow0 (&obstack, asm_spec, strlen (asm_spec));
    asm_spec = obstack_finish (&obstack);
  }
#endif
#ifdef LINK_EH_SPEC
  /* Prepend LINK_EH_SPEC to whatever link_spec we had before.  */
  obstack_grow (&obstack, LINK_EH_SPEC, sizeof(LINK_EH_SPEC) - 1);
  obstack_grow0 (&obstack, link_spec, strlen (link_spec));
  link_spec = obstack_finish (&obstack);
#endif

  specs = sl;
}
\f
/* Change the value of spec NAME to SPEC.  If SPEC is empty, then the spec is
   removed; If the spec starts with a + then SPEC is added to the end of the
   current spec.  */

static void
set_spec (name, spec)
     const char *name;
     const char *spec;
{
  struct spec_list *sl;
  const char *old_spec;
  int name_len = strlen (name);
  int i;

  /* If this is the first call, initialize the statically allocated specs.  */
  if (!specs)
    {
      struct spec_list *next = (struct spec_list *) 0;
      for (i = ARRAY_SIZE (static_specs) - 1; i >= 0; i--)
        {
          sl = &static_specs[i];
          sl->next = next;
          next = sl;
        }
      specs = sl;
    }

  /* See if the spec already exists.  */
  for (sl = specs; sl; sl = sl->next)
    if (name_len == sl->name_len && !strcmp (sl->name, name))
      break;

  if (!sl)
    {
      /* Not found - make it.  */
      sl = (struct spec_list *) xmalloc (sizeof (struct spec_list));
      sl->name = xstrdup (name);
      sl->name_len = name_len;
      sl->ptr_spec = &sl->ptr;
      sl->alloc_p = 0;
      *(sl->ptr_spec) = "";
      sl->next = specs;
      specs = sl;
    }

  old_spec = *(sl->ptr_spec);
  *(sl->ptr_spec) = ((spec[0] == '+' && ISSPACE ((unsigned char)spec[1]))
                     ? concat (old_spec, spec + 1, NULL)
                     : xstrdup (spec));

#ifdef DEBUG_SPECS
  if (verbose_flag)
    notice ("Setting spec %s to '%s'\n\n", name, *(sl->ptr_spec));
#endif

  /* Free the old spec.  */
  if (old_spec && sl->alloc_p)
    free ((PTR) old_spec);

  sl->alloc_p = 1;
}
\f
/* Accumulate a command (program name and args), and run it.  */

/* Vector of pointers to arguments in the current line of specifications.  */

static const char **argbuf;

/* Number of elements allocated in argbuf.  */

static int argbuf_length;

/* Number of elements in argbuf currently in use (containing args).  */

static int argbuf_index;

/* This is the list of suffixes and codes (%g/%u/%U/%j) and the associated
   temp file.  If the HOST_BIT_BUCKET is used for %j, no entry is made for
   it here.  */

static struct temp_name {
  const char *suffix;   /* suffix associated with the code.  */
  int length;           /* strlen (suffix).  */
  int unique;           /* Indicates whether %g or %u/%U was used.  */
  const char *filename; /* associated filename.  */
  int filename_length;  /* strlen (filename).  */
  struct temp_name *next;
} *temp_names;

/* Number of commands executed so far.  */

static int execution_count;

/* Number of commands that exited with a signal.  */

static int signal_count;

/* Name with which this program was invoked.  */

static const char *programname;
\f
/* Clear out the vector of arguments (after a command is executed).  */

static void
clear_args ()
{
  argbuf_index = 0;
}

/* Add one argument to the vector at the end.
   This is done when a space is seen or at the end of the line.
   If DELETE_ALWAYS is nonzero, the arg is a filename
    and the file should be deleted eventually.
   If DELETE_FAILURE is nonzero, the arg is a filename
    and the file should be deleted if this compilation fails.  */

static void
store_arg (arg, delete_always, delete_failure)
     const char *arg;
     int delete_always, delete_failure;
{
  if (argbuf_index + 1 == argbuf_length)
    argbuf
      = (const char **) xrealloc (argbuf,
                                  (argbuf_length *= 2) * sizeof (const char *));

  argbuf[argbuf_index++] = arg;
  argbuf[argbuf_index] = 0;

  if (delete_always || delete_failure)
    record_temp_file (arg, delete_always, delete_failure);
}
\f
/* Load specs from a file name named FILENAME, replacing occurrences of
   various different types of line-endings, \r\n, \n\r and just \r, with
   a single \n.  */

static char *
load_specs (filename)
     const char *filename;
{
  int desc;
  int readlen;
  struct stat statbuf;
  char *buffer;
  char *buffer_p;
  char *specs;
  char *specs_p;

  if (verbose_flag)
    notice ("Reading specs from %s\n", filename);

  /* Open and stat the file.  */
  desc = open (filename, O_RDONLY, 0);
  if (desc < 0)
    pfatal_with_name (filename);
  if (stat (filename, &statbuf) < 0)
    pfatal_with_name (filename);

  /* Read contents of file into BUFFER.  */
  buffer = xmalloc ((unsigned) statbuf.st_size + 1);
  readlen = read (desc, buffer, (unsigned) statbuf.st_size);
  if (readlen < 0)
    pfatal_with_name (filename);
  buffer[readlen] = 0;
  close (desc);

  specs = xmalloc (readlen + 1);
  specs_p = specs;
  for (buffer_p = buffer; buffer_p && *buffer_p; buffer_p++)
    {
      int skip = 0;
      char c = *buffer_p;
      if (c == '\r')
        {
          if (buffer_p > buffer && *(buffer_p - 1) == '\n')     /* \n\r */
            skip = 1;
          else if (*(buffer_p + 1) == '\n')                     /* \r\n */
            skip = 1;
          else                                                  /* \r */
            c = '\n';
        }
      if (! skip)
        *specs_p++ = c;
    }
  *specs_p = '\0';

  free (buffer);
  return (specs);
}

/* Read compilation specs from a file named FILENAME,
   replacing the default ones.

   A suffix which starts with `*' is a definition for
   one of the machine-specific sub-specs.  The "suffix" should be
   *asm, *cc1, *cpp, *link, *startfile, etc.
   The corresponding spec is stored in asm_spec, etc.,
   rather than in the `compilers' vector.

   Anything invalid in the file is a fatal error.  */

static void
read_specs (filename, main_p)
     const char *filename;
     int main_p;
{
  char *buffer;
  char *p;

  buffer = load_specs (filename);

  /* Scan BUFFER for specs, putting them in the vector.  */
  p = buffer;
  while (1)
    {
      char *suffix;
      char *spec;
      char *in, *out, *p1, *p2, *p3;

      /* Advance P in BUFFER to the next nonblank nocomment line.  */
      p = skip_whitespace (p);
      if (*p == 0)
        break;

      /* Is this a special command that starts with '%'? */
      /* Don't allow this for the main specs file, since it would
         encourage people to overwrite it.  */
      if (*p == '%' && !main_p)
        {
          p1 = p;
          while (*p && *p != '\n')
            p++;

          /* Skip '\n'.  */
          p++;

          if (!strncmp (p1, "%include", sizeof ("%include") - 1)
              && (p1[sizeof "%include" - 1] == ' '
                  || p1[sizeof "%include" - 1] == '\t'))
            {
              char *new_filename;

              p1 += sizeof ("%include");
              while (*p1 == ' ' || *p1 == '\t')
                p1++;

              if (*p1++ != '<' || p[-2] != '>')
                fatal ("specs %%include syntax malformed after %ld characters",
                       (long) (p1 - buffer + 1));

              p[-2] = '\0';
              new_filename = find_a_file (&startfile_prefixes, p1, R_OK);
              read_specs (new_filename ? new_filename : p1, FALSE);
              continue;
            }
          else if (!strncmp (p1, "%include_noerr", sizeof "%include_noerr" - 1)
                   && (p1[sizeof "%include_noerr" - 1] == ' '
                       || p1[sizeof "%include_noerr" - 1] == '\t'))
            {
              char *new_filename;

              p1 += sizeof "%include_noerr";
              while (*p1 == ' ' || *p1 == '\t')
                p1++;

              if (*p1++ != '<' || p[-2] != '>')
                fatal ("specs %%include syntax malformed after %ld characters",
                       (long) (p1 - buffer + 1));

              p[-2] = '\0';
              new_filename = find_a_file (&startfile_prefixes, p1, R_OK);
              if (new_filename)
                read_specs (new_filename, FALSE);
              else if (verbose_flag)
                notice ("could not find specs file %s\n", p1);
              continue;
            }
          else if (!strncmp (p1, "%rename", sizeof "%rename" - 1)
                   && (p1[sizeof "%rename" - 1] == ' '
                       || p1[sizeof "%rename" - 1] == '\t'))
            {
              int name_len;
              struct spec_list *sl;

              /* Get original name */
              p1 += sizeof "%rename";
              while (*p1 == ' ' || *p1 == '\t')
                p1++;

              if (! ISALPHA ((unsigned char) *p1))
                fatal ("specs %%rename syntax malformed after %ld characters",
                       (long) (p1 - buffer));

              p2 = p1;
              while (*p2 && !ISSPACE ((unsigned char) *p2))
                p2++;

              if (*p2 != ' ' && *p2 != '\t')
                fatal ("specs %%rename syntax malformed after %ld characters",
                       (long) (p2 - buffer));

              name_len = p2 - p1;
              *p2++ = '\0';
              while (*p2 == ' ' || *p2 == '\t')
                p2++;

              if (! ISALPHA ((unsigned char) *p2))
                fatal ("specs %%rename syntax malformed after %ld characters",
                       (long) (p2 - buffer));

              /* Get new spec name.  */
              p3 = p2;
              while (*p3 && !ISSPACE ((unsigned char) *p3))
                p3++;

              if (p3 != p - 1)
                fatal ("specs %%rename syntax malformed after %ld characters",
                       (long) (p3 - buffer));
              *p3 = '\0';

              for (sl = specs; sl; sl = sl->next)
                if (name_len == sl->name_len && !strcmp (sl->name, p1))
                  break;

              if (!sl)
                fatal ("specs %s spec was not found to be renamed", p1);

              if (strcmp (p1, p2) == 0)
                continue;

              if (verbose_flag)
                {
                  notice ("rename spec %s to %s\n", p1, p2);
#ifdef DEBUG_SPECS
                  notice ("spec is '%s'\n\n", *(sl->ptr_spec));
#endif
                }

              set_spec (p2, *(sl->ptr_spec));
              if (sl->alloc_p)
                free ((PTR) *(sl->ptr_spec));

              *(sl->ptr_spec) = "";
              sl->alloc_p = 0;
              continue;
            }
          else
            fatal ("specs unknown %% command after %ld characters",
                   (long) (p1 - buffer));
        }

      /* Find the colon that should end the suffix.  */
      p1 = p;
      while (*p1 && *p1 != ':' && *p1 != '\n')
        p1++;

      /* The colon shouldn't be missing.  */
      if (*p1 != ':')
        fatal ("specs file malformed after %ld characters",
               (long) (p1 - buffer));

      /* Skip back over trailing whitespace.  */
      p2 = p1;
      while (p2 > buffer && (p2[-1] == ' ' || p2[-1] == '\t'))
        p2--;

      /* Copy the suffix to a string.  */
      suffix = save_string (p, p2 - p);
      /* Find the next line.  */
      p = skip_whitespace (p1 + 1);
      if (p[1] == 0)
        fatal ("specs file malformed after %ld characters",
               (long) (p - buffer));

      p1 = p;
      /* Find next blank line or end of string.  */
      while (*p1 && !(*p1 == '\n' && (p1[1] == '\n' || p1[1] == '\0')))
        p1++;

      /* Specs end at the blank line and do not include the newline.  */
      spec = save_string (p, p1 - p);
      p = p1;

      /* Delete backslash-newline sequences from the spec.  */
      in = spec;
      out = spec;
      while (*in != 0)
        {
          if (in[0] == '\\' && in[1] == '\n')
            in += 2;
          else if (in[0] == '#')
            while (*in && *in != '\n')
              in++;

          else
            *out++ = *in++;
        }
      *out = 0;

      if (suffix[0] == '*')
        {
          if (! strcmp (suffix, "*link_command"))
            link_command_spec = spec;
          else
            set_spec (suffix + 1, spec);
        }
      else
        {
          /* Add this pair to the vector.  */
          compilers
            = ((struct compiler *)
               xrealloc (compilers,
                         (n_compilers + 2) * sizeof (struct compiler)));

          compilers[n_compilers].suffix = suffix;
          compilers[n_compilers].spec = spec;
          n_compilers++;
          memset (&compilers[n_compilers], 0, sizeof compilers[n_compilers]);
        }

      if (*suffix == 0)
        link_command_spec = spec;
    }

  if (link_command_spec == 0)
    fatal ("spec file has no spec for linking");
}
\f
/* Record the names of temporary files we tell compilers to write,
   and delete them at the end of the run.  */

/* This is the common prefix we use to make temp file names.
   It is chosen once for each run of this program.
   It is substituted into a spec by %g or %j.
   Thus, all temp file names contain this prefix.
   In practice, all temp file names start with this prefix.

   This prefix comes from the envvar TMPDIR if it is defined;
   otherwise, from the P_tmpdir macro if that is defined;
   otherwise, in /usr/tmp or /tmp;
   or finally the current directory if all else fails.  */

static const char *temp_filename;

/* Length of the prefix.  */

static int temp_filename_length;

/* Define the list of temporary files to delete.  */

struct temp_file
{
  const char *name;
  struct temp_file *next;
};

/* Queue of files to delete on success or failure of compilation.  */
static struct temp_file *always_delete_queue;
/* Queue of files to delete on failure of compilation.  */
static struct temp_file *failure_delete_queue;

/* Record FILENAME as a file to be deleted automatically.
   ALWAYS_DELETE nonzero means delete it if all compilation succeeds;
   otherwise delete it in any case.
   FAIL_DELETE nonzero means delete it if a compilation step fails;
   otherwise delete it in any case.  */

void
record_temp_file (filename, always_delete, fail_delete)
     const char *filename;
     int always_delete;
     int fail_delete;
{
  char *const name = xstrdup (filename);

  if (always_delete)
    {
      struct temp_file *temp;
      for (temp = always_delete_queue; temp; temp = temp->next)
        if (! strcmp (name, temp->name))
          goto already1;

      temp = (struct temp_file *) xmalloc (sizeof (struct temp_file));
      temp->next = always_delete_queue;
      temp->name = name;
      always_delete_queue = temp;

    already1:;
    }

  if (fail_delete)
    {
      struct temp_file *temp;
      for (temp = failure_delete_queue; temp; temp = temp->next)
        if (! strcmp (name, temp->name))
          goto already2;

      temp = (struct temp_file *) xmalloc (sizeof (struct temp_file));
      temp->next = failure_delete_queue;
      temp->name = name;
      failure_delete_queue = temp;

    already2:;
    }
}

/* Delete all the temporary files whose names we previously recorded.  */

static void
delete_if_ordinary (name)
     const char *name;
{
  struct stat st;
#ifdef DEBUG
  int i, c;

  printf ("Delete %s? (y or n) ", name);
  fflush (stdout);
  i = getchar ();
  if (i != '\n')
    while ((c = getchar ()) != '\n' && c != EOF)
      ;

  if (i == 'y' || i == 'Y')
#endif /* DEBUG */
    if (stat (name, &st) >= 0 && S_ISREG (st.st_mode))
      if (unlink (name) < 0)
        if (verbose_flag)
          perror_with_name (name);
}

static void
delete_temp_files ()
{
  struct temp_file *temp;

  for (temp = always_delete_queue; temp; temp = temp->next)
    delete_if_ordinary (temp->name);
  always_delete_queue = 0;
}

/* Delete all the files to be deleted on error.  */

static void
delete_failure_queue ()
{
  struct temp_file *temp;

  for (temp = failure_delete_queue; temp; temp = temp->next)
    delete_if_ordinary (temp->name);
}

static void
clear_failure_queue ()
{
  failure_delete_queue = 0;
}
\f
/* Build a list of search directories from PATHS.
   PREFIX is a string to prepend to the list.
   If CHECK_DIR_P is non-zero we ensure the directory exists.
   This is used mostly by putenv_from_prefixes so we use `collect_obstack'.
   It is also used by the --print-search-dirs flag.  */

static char *
build_search_list (paths, prefix, check_dir_p)
     struct path_prefix *paths;
     const char *prefix;
     int check_dir_p;
{
  int suffix_len = (machine_suffix) ? strlen (machine_suffix) : 0;
  int just_suffix_len
    = (just_machine_suffix) ? strlen (just_machine_suffix) : 0;
  int first_time = TRUE;
  struct prefix_list *pprefix;

  obstack_grow (&collect_obstack, prefix, strlen (prefix));
  obstack_1grow (&collect_obstack, '=');

  for (pprefix = paths->plist; pprefix != 0; pprefix = pprefix->next)
    {
      int len = strlen (pprefix->prefix);

      if (machine_suffix
          && (! check_dir_p
              || is_directory (pprefix->prefix, machine_suffix, 0)))
        {
          if (!first_time)
            obstack_1grow (&collect_obstack, PATH_SEPARATOR);

          first_time = FALSE;
          obstack_grow (&collect_obstack, pprefix->prefix, len);
          obstack_grow (&collect_obstack, machine_suffix, suffix_len);
        }

      if (just_machine_suffix
          && pprefix->require_machine_suffix == 2
          && (! check_dir_p
              || is_directory (pprefix->prefix, just_machine_suffix, 0)))
        {
          if (! first_time)
            obstack_1grow (&collect_obstack, PATH_SEPARATOR);

          first_time = FALSE;
          obstack_grow (&collect_obstack, pprefix->prefix, len);
          obstack_grow (&collect_obstack, just_machine_suffix,
                        just_suffix_len);
        }

      if (! pprefix->require_machine_suffix)
        {
          if (! first_time)
            obstack_1grow (&collect_obstack, PATH_SEPARATOR);

          first_time = FALSE;
          obstack_grow (&collect_obstack, pprefix->prefix, len);
        }
    }

  obstack_1grow (&collect_obstack, '\0');
  return obstack_finish (&collect_obstack);
}

/* Rebuild the COMPILER_PATH and LIBRARY_PATH environment variables
   for collect.  */

static void
putenv_from_prefixes (paths, env_var)
     struct path_prefix *paths;
     const char *env_var;
{
  putenv (build_search_list (paths, env_var, 1));
}
\f
#ifndef VMS

/* FIXME: the location independence code for VMS is hairier than this,
   and hasn't been written.  */

/* Split a filename into component directories.  */

static char **
split_directories (name, ptr_num_dirs)
     const char *name;
     int *ptr_num_dirs;
{
  int num_dirs = 0;
  char **dirs;
  const char *p, *q;
  int ch;

  /* Count the number of directories.  Special case MSDOS disk names as part
     of the initial directory.  */
  p = name;
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
  if (name[1] == ':' && IS_DIR_SEPARATOR (name[2]))
    {
      p += 3;
      num_dirs++;
    }
#endif /* HAVE_DOS_BASED_FILE_SYSTEM */

  while ((ch = *p++) != '\0')
    {
      if (IS_DIR_SEPARATOR (ch))
        {
          num_dirs++;
          while (IS_DIR_SEPARATOR (*p))
            p++;
        }
    }

  dirs = (char **) xmalloc (sizeof (char *) * (num_dirs + 2));

  /* Now copy the directory parts.  */
  num_dirs = 0;
  p = name;
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
  if (name[1] == ':' && IS_DIR_SEPARATOR (name[2]))
    {
      dirs[num_dirs++] = save_string (p, 3);
      p += 3;
    }
#endif /* HAVE_DOS_BASED_FILE_SYSTEM */

  q = p;
  while ((ch = *p++) != '\0')
    {
      if (IS_DIR_SEPARATOR (ch))
        {
          while (IS_DIR_SEPARATOR (*p))
            p++;

          dirs[num_dirs++] = save_string (q, p - q);
          q = p;
        }
    }

  if (p - 1 - q > 0)
    dirs[num_dirs++] = save_string (q, p - 1 - q);

  dirs[num_dirs] = NULL;
  if (ptr_num_dirs)
    *ptr_num_dirs = num_dirs;

  return dirs;
}

/* Release storage held by split directories.  */

static void
free_split_directories (dirs)
     char **dirs;
{
  int i = 0;

  while (dirs[i] != NULL)
    free (dirs[i++]);

  free ((char *) dirs);
}

/* Given three strings PROGNAME, BIN_PREFIX, PREFIX, return a string that gets
   to PREFIX starting with the directory portion of PROGNAME and a relative
   pathname of the difference between BIN_PREFIX and PREFIX.

   For example, if BIN_PREFIX is /alpha/beta/gamma/gcc/delta, PREFIX is
   /alpha/beta/gamma/omega/, and PROGNAME is /red/green/blue/gcc, then this
   function will return /red/green/blue/../omega.

   If no relative prefix can be found, return NULL.  */

static char *
make_relative_prefix (progname, bin_prefix, prefix)
     const char *progname;
     const char *bin_prefix;
     const char *prefix;
{
  char **prog_dirs, **bin_dirs, **prefix_dirs;
  int prog_num, bin_num, prefix_num, std_loc_p;
  int i, n, common;

  prog_dirs = split_directories (progname, &prog_num);
  bin_dirs = split_directories (bin_prefix, &bin_num);

  /* If there is no full pathname, try to find the program by checking in each
     of the directories specified in the PATH environment variable.  */
  if (prog_num == 1)
    {
      char *temp;

      GET_ENV_PATH_LIST (temp, "PATH");
      if (temp)
        {
          char *startp, *endp, *nstore;
          size_t prefixlen = strlen (temp) + 1;
          if (prefixlen < 2)
            prefixlen = 2;

          nstore = (char *) alloca (prefixlen + strlen (progname) + 1);

          startp = endp = temp;
          while (1)
            {
              if (*endp == PATH_SEPARATOR || *endp == 0)
                {
                  if (endp == startp)
                    {
                      nstore[0] = '.';
                      nstore[1] = DIR_SEPARATOR;
                      nstore[2] = '\0';
                    }
                  else
                    {
                      strncpy (nstore, startp, endp - startp);
                      if (! IS_DIR_SEPARATOR (endp[-1]))
                        {
                          nstore[endp - startp] = DIR_SEPARATOR;
                          nstore[endp - startp + 1] = 0;
                        }
                      else
                        nstore[endp - startp] = 0;
                    }
                  strcat (nstore, progname);
                  if (! access (nstore, X_OK)
#ifdef HAVE_HOST_EXECUTABLE_SUFFIX
                      || ! access (strcat (nstore, HOST_EXECUTABLE_SUFFIX), X_OK)
#endif
                      )
                    {
                      free_split_directories (prog_dirs);
                      progname = nstore;
                      prog_dirs = split_directories (progname, &prog_num);
                      break;
                    }

                  if (*endp == 0)
                    break;
                  endp = startp = endp + 1;
                }
              else
                endp++;
            }
        }
    }

  /* Remove the program name from comparison of directory names.  */
  prog_num--;

  /* Determine if the compiler is installed in the standard location, and if
     so, we don't need to specify relative directories.  Also, if argv[0]
     doesn't contain any directory specifiers, there is not much we can do.  */
  std_loc_p = 0;
  if (prog_num == bin_num)
    {
      for (i = 0; i < bin_num; i++)
        {
          if (strcmp (prog_dirs[i], bin_dirs[i]) != 0)
            break;
        }

      if (prog_num <= 0 || i == bin_num)
        {
          std_loc_p = 1;
          free_split_directories (prog_dirs);
          free_split_directories (bin_dirs);
          prog_dirs = bin_dirs = (char **) 0;
          return NULL;
        }
    }

  prefix_dirs = split_directories (prefix, &prefix_num);

  /* Find how many directories are in common between bin_prefix & prefix.  */
  n = (prefix_num < bin_num) ? prefix_num : bin_num;
  for (common = 0; common < n; common++)
    {
      if (strcmp (bin_dirs[common], prefix_dirs[common]) != 0)
        break;
    }

  /* If there are no common directories, there can be no relative prefix.  */
  if (common == 0)
    {
      free_split_directories (prog_dirs);
      free_split_directories (bin_dirs);
      free_split_directories (prefix_dirs);
      return NULL;
    }

  /* Build up the pathnames in argv[0].  */
  for (i = 0; i < prog_num; i++)
    obstack_grow (&obstack, prog_dirs[i], strlen (prog_dirs[i]));

  /* Now build up the ..'s.  */
  for (i = common; i < n; i++)
    {
      obstack_grow (&obstack, DIR_UP, sizeof (DIR_UP) - 1);
      obstack_1grow (&obstack, DIR_SEPARATOR);
    }

  /* Put in directories to move over to prefix.  */
  for (i = common; i < prefix_num; i++)
    obstack_grow (&obstack, prefix_dirs[i], strlen (prefix_dirs[i]));

  free_split_directories (prog_dirs);
  free_split_directories (bin_dirs);
  free_split_directories (prefix_dirs);

  obstack_1grow (&obstack, '\0');
  return obstack_finish (&obstack);
}
#endif /* VMS */
\f
/* Check whether NAME can be accessed in MODE.  This is like access,
   except that it never considers directories to be executable.  */

static int
access_check (name, mode)
     const char *name;
     int mode;
{
  if (mode == X_OK)
    {
      struct stat st;

      if (stat (name, &st) < 0
          || S_ISDIR (st.st_mode))
        return -1;
    }

  return access (name, mode);
}

/* Search for NAME using the prefix list PREFIXES.  MODE is passed to
   access to check permissions.
   Return 0 if not found, otherwise return its name, allocated with malloc.  */

static char *
find_a_file (pprefix, name, mode)
     struct path_prefix *pprefix;
     const char *name;
     int mode;
{
  char *temp;
  const char *const file_suffix =
    ((mode & X_OK) != 0 ? HOST_EXECUTABLE_SUFFIX : "");
  struct prefix_list *pl;
  int len = pprefix->max_len + strlen (name) + strlen (file_suffix) + 1;

#ifdef DEFAULT_ASSEMBLER
  if (! strcmp (name, "as") && access (DEFAULT_ASSEMBLER, mode) == 0)
    return xstrdup (DEFAULT_ASSEMBLER);
#endif

#ifdef DEFAULT_LINKER
  if (! strcmp(name, "ld") && access (DEFAULT_LINKER, mode) == 0)
    return xstrdup (DEFAULT_LINKER);
#endif

  if (machine_suffix)
    len += strlen (machine_suffix);

  temp = xmalloc (len);

  /* Determine the filename to execute (special case for absolute paths).  */

  if (IS_ABSOLUTE_PATHNAME (name))
    {
      if (access (name, mode) == 0)
        {
          strcpy (temp, name);
          return temp;
        }
    }
  else
    for (pl = pprefix->plist; pl; pl = pl->next)
      {
        if (machine_suffix)
          {
            /* Some systems have a suffix for executable files.
               So try appending that first.  */
            if (file_suffix[0] != 0)
              {
                strcpy (temp, pl->prefix);
                strcat (temp, machine_suffix);
                strcat (temp, name);
                strcat (temp, file_suffix);
                if (access_check (temp, mode) == 0)
                  {
                    if (pl->used_flag_ptr != 0)
                      *pl->used_flag_ptr = 1;
                    return temp;
                  }
              }

            /* Now try just the name.  */
            strcpy (temp, pl->prefix);
            strcat (temp, machine_suffix);
            strcat (temp, name);
            if (access_check (temp, mode) == 0)
              {
                if (pl->used_flag_ptr != 0)
                  *pl->used_flag_ptr = 1;
                return temp;
              }
          }

        /* Certain prefixes are tried with just the machine type,
           not the version.  This is used for finding as, ld, etc.  */
        if (just_machine_suffix && pl->require_machine_suffix == 2)
          {
            /* Some systems have a suffix for executable files.
               So try appending that first.  */
            if (file_suffix[0] != 0)
              {
                strcpy (temp, pl->prefix);
                strcat (temp, just_machine_suffix);
                strcat (temp, name);
                strcat (temp, file_suffix);
                if (access_check (temp, mode) == 0)
                  {
                    if (pl->used_flag_ptr != 0)
                      *pl->used_flag_ptr = 1;
                    return temp;
                  }
              }

            strcpy (temp, pl->prefix);
            strcat (temp, just_machine_suffix);
            strcat (temp, name);
            if (access_check (temp, mode) == 0)
              {
                if (pl->used_flag_ptr != 0)
                  *pl->used_flag_ptr = 1;
                return temp;
              }
          }

        /* Certain prefixes can't be used without the machine suffix
           when the machine or version is explicitly specified.  */
        if (! pl->require_machine_suffix)
          {
            /* Some systems have a suffix for executable files.
               So try appending that first.  */
            if (file_suffix[0] != 0)
              {
                strcpy (temp, pl->prefix);
                strcat (temp, name);
                strcat (temp, file_suffix);
                if (access_check (temp, mode) == 0)
                  {
                    if (pl->used_flag_ptr != 0)
                      *pl->used_flag_ptr = 1;
                    return temp;
                  }
              }

            strcpy (temp, pl->prefix);
            strcat (temp, name);
            if (access_check (temp, mode) == 0)
              {
                if (pl->used_flag_ptr != 0)
                  *pl->used_flag_ptr = 1;
                return temp;
              }
          }
      }

  free (temp);
  return 0;
}

/* Ranking of prefixes in the sort list. -B prefixes are put before
   all others.  */

enum path_prefix_priority
{
  PREFIX_PRIORITY_B_OPT,
  PREFIX_PRIORITY_LAST
};

/* Add an entry for PREFIX in PLIST.  The PLIST is kept in assending
   order according to PRIORITY.  Within each PRIORITY, new entries are
   appended.

   If WARN is nonzero, we will warn if no file is found
   through this prefix.  WARN should point to an int
   which will be set to 1 if this entry is used.

   COMPONENT is the value to be passed to update_path.

   REQUIRE_MACHINE_SUFFIX is 1 if this prefix can't be used without
   the complete value of machine_suffix.
   2 means try both machine_suffix and just_machine_suffix.  */

static void
add_prefix (pprefix, prefix, component, priority, require_machine_suffix, warn)
     struct path_prefix *pprefix;
     const char *prefix;
     const char *component;
     /* enum prefix_priority */ int priority;
     int require_machine_suffix;
     int *warn;
{
  struct prefix_list *pl, **prev;
  int len;

  for (prev = &pprefix->plist;
       (*prev) != NULL && (*prev)->priority <= priority;
       prev = &(*prev)->next)
    ;

  /* Keep track of the longest prefix */

  prefix = update_path (prefix, component);
  len = strlen (prefix);
  if (len > pprefix->max_len)
    pprefix->max_len = len;

  pl = (struct prefix_list *) xmalloc (sizeof (struct prefix_list));
  pl->prefix = prefix;
  pl->require_machine_suffix = require_machine_suffix;
  pl->used_flag_ptr = warn;
  pl->priority = priority;
  if (warn)
    *warn = 0;

  /* Insert after PREV */
  pl->next = (*prev);
  (*prev) = pl;
}
\f
/* Execute the command specified by the arguments on the current line of spec.
   When using pipes, this includes several piped-together commands
   with `|' between them.

   Return 0 if successful, -1 if failed.  */

static int
execute ()
{
  int i;
  int n_commands;               /* # of command.  */
  char *string;
  struct command
  {
    const char *prog;           /* program name.  */
    const char **argv;          /* vector of args.  */
    int pid;                    /* pid of process for this command.  */
  };

  struct command *commands;     /* each command buffer with above info.  */

  /* Count # of piped commands.  */
  for (n_commands = 1, i = 0; i < argbuf_index; i++)
    if (strcmp (argbuf[i], "|") == 0)
      n_commands++;

  /* Get storage for each command.  */
  commands = (struct command *) alloca (n_commands * sizeof (struct command));

  /* Split argbuf into its separate piped processes,
     and record info about each one.
     Also search for the programs that are to be run.  */

  commands[0].prog = argbuf[0]; /* first command.  */
  commands[0].argv = &argbuf[0];
  string = find_a_file (&exec_prefixes, commands[0].prog, X_OK);

  if (string)
    commands[0].argv[0] = string;

  for (n_commands = 1, i = 0; i < argbuf_index; i++)
    if (strcmp (argbuf[i], "|") == 0)
      {                         /* each command.  */
#if defined (__MSDOS__) || defined (OS2) || defined (VMS)
        fatal ("-pipe not supported");
#endif
        argbuf[i] = 0;  /* termination of command args.  */
        commands[n_commands].prog = argbuf[i + 1];
        commands[n_commands].argv = &argbuf[i + 1];
        string = find_a_file (&exec_prefixes, commands[n_commands].prog, X_OK);
        if (string)
          commands[n_commands].argv[0] = string;
        n_commands++;
      }

  argbuf[argbuf_index] = 0;

  /* If -v, print what we are about to do, and maybe query.  */

  if (verbose_flag)
    {
      /* For help listings, put a blank line between sub-processes.  */
      if (print_help_list)
        fputc ('\n', stderr);

      /* Print each piped command as a separate line.  */
      for (i = 0; i < n_commands; i++)
        {
          const char *const *j;

          if (verbose_only_flag)
            {
              for (j = commands[i].argv; *j; j++)
                {
                  const char *p;
                  fprintf (stderr, " \"");
                  for (p = *j; *p; ++p)
                    {
                      if (*p == '"' || *p == '\\' || *p == '$')
                        fputc ('\\', stderr);
                      fputc (*p, stderr);
                    }
                  fputc ('"', stderr);
                }
            }
          else
            for (j = commands[i].argv; *j; j++)
              fprintf (stderr, " %s", *j);

          /* Print a pipe symbol after all but the last command.  */
          if (i + 1 != n_commands)
            fprintf (stderr, " |");
          fprintf (stderr, "\n");
        }
      fflush (stderr);
      if (verbose_only_flag != 0)
        return 0;
#ifdef DEBUG
      notice ("\nGo ahead? (y or n) ");
      fflush (stderr);
      i = getchar ();
      if (i != '\n')
        while (getchar () != '\n')
          ;

      if (i != 'y' && i != 'Y')
        return 0;
#endif /* DEBUG */
    }

  /* Run each piped subprocess.  */

  for (i = 0; i < n_commands; i++)
    {
      char *errmsg_fmt, *errmsg_arg;
      const char *string = commands[i].argv[0];

      /* For some bizarre reason, the second argument of execvp() is
         char *const *, not const char *const *.  */
      commands[i].pid = pexecute (string, (char *const *) commands[i].argv,
                                  programname, temp_filename,
                                  &errmsg_fmt, &errmsg_arg,
                                  ((i == 0 ? PEXECUTE_FIRST : 0)
                                   | (i + 1 == n_commands ? PEXECUTE_LAST : 0)
                                   | (string == commands[i].prog
                                      ? PEXECUTE_SEARCH : 0)
                                   | (verbose_flag ? PEXECUTE_VERBOSE : 0)));

      if (commands[i].pid == -1)
        pfatal_pexecute (errmsg_fmt, errmsg_arg);

      if (string != commands[i].prog)
        free ((PTR) string);
    }

  execution_count++;

  /* Wait for all the subprocesses to finish.
     We don't care what order they finish in;
     we know that N_COMMANDS waits will get them all.
     Ignore subprocesses that we don't know about,
     since they can be spawned by the process that exec'ed us.  */

  {
    int ret_code = 0;
#ifdef HAVE_GETRUSAGE
    struct timeval d;
    double ut = 0.0, st = 0.0;
#endif

    for (i = 0; i < n_commands;)
      {
        int j;
        int status;
        int pid;

        pid = pwait (commands[i].pid, &status, 0);
        if (pid < 0)
          abort ();

#ifdef HAVE_GETRUSAGE
        if (report_times)
          {
            /* getrusage returns the total resource usage of all children
               up to now.  Copy the previous values into prus, get the
               current statistics, then take the difference.  */

            prus = rus;
            getrusage (RUSAGE_CHILDREN, &rus);
            d.tv_sec = rus.ru_utime.tv_sec - prus.ru_utime.tv_sec;
            d.tv_usec = rus.ru_utime.tv_usec - prus.ru_utime.tv_usec;
            ut = (double) d.tv_sec + (double) d.tv_usec / 1.0e6;

            d.tv_sec = rus.ru_stime.tv_sec - prus.ru_stime.tv_sec;
            d.tv_usec = rus.ru_stime.tv_usec - prus.ru_stime.tv_usec;
            st = (double) d.tv_sec + (double) d.tv_usec / 1.0e6;
          }
#endif

        for (j = 0; j < n_commands; j++)
          if (commands[j].pid == pid)
            {
              i++;
              if (WIFSIGNALED (status))
                {
#ifdef SIGPIPE
                  /* SIGPIPE is a special case.  It happens in -pipe mode
                     when the compiler dies before the preprocessor is
                     done, or the assembler dies before the compiler is
                     done.  There's generally been an error already, and
                     this is just fallout.  So don't generate another error
                     unless we would otherwise have succeeded.  */
                  if (WTERMSIG (status) == SIGPIPE
                      && (signal_count || greatest_status >= MIN_FATAL_STATUS))
                    ;
                  else
#endif
                    fatal ("\
Internal error: %s (program %s)\n\
Please submit a full bug report.\n\
See %s for instructions.",
                           strsignal (WTERMSIG (status)), commands[j].prog,
                           GCCBUGURL);
                  signal_count++;
                  ret_code = -1;
                }
              else if (WIFEXITED (status)
                       && WEXITSTATUS (status) >= MIN_FATAL_STATUS)
                {
                  if (WEXITSTATUS (status) > greatest_status)
                    greatest_status = WEXITSTATUS (status);
                  ret_code = -1;
                }
#ifdef HAVE_GETRUSAGE
              if (report_times && ut + st != 0)
                notice ("# %s %.2f %.2f\n", commands[j].prog, ut, st);
#endif
              break;
            }
      }
    return ret_code;
  }
}
\f
/* Find all the switches given to us
   and make a vector describing them.
   The elements of the vector are strings, one per switch given.
   If a switch uses following arguments, then the `part1' field
   is the switch itself and the `args' field
   is a null-terminated vector containing the following arguments.
   The `live_cond' field is:
   0 when initialized
   1 if the switch is true in a conditional spec,
   -1 if false (overridden by a later switch)
   -2 if this switch should be ignored (used in %{<S})
   The `validated' field is nonzero if any spec has looked at this switch;
   if it remains zero at the end of the run, it must be meaningless.  */

#define SWITCH_OK       0
#define SWITCH_FALSE   -1
#define SWITCH_IGNORE  -2
#define SWITCH_LIVE     1

struct switchstr
{
  const char *part1;
  const char **args;
  int live_cond;
  unsigned char validated;
  unsigned char ordering;
};

static struct switchstr *switches;

static int n_switches;

struct infile
{
  const char *name;
  const char *language;
};

/* Also a vector of input files specified.  */

static struct infile *infiles;

int n_infiles;

/* This counts the number of libraries added by lang_specific_driver, so that
   we can tell if there were any user supplied any files or libraries.  */

static int added_libraries;

/* And a vector of corresponding output files is made up later.  */

const char **outfiles;

/* Used to track if none of the -B paths are used.  */
static int warn_B;

/* Used to track if standard path isn't used and -b or -V is specified.  */
static int warn_std;

/* Gives value to pass as "warn" to add_prefix for standard prefixes.  */
static int *warn_std_ptr = 0;
\f
#if defined(HAVE_TARGET_OBJECT_SUFFIX) || defined(HAVE_TARGET_EXECUTABLE_SUFFIX)

/* Convert NAME to a new name if it is the standard suffix.  DO_EXE
   is true if we should look for an executable suffix.  DO_OBJ
   is true if we should look for an object suffix.  */

static const char *
convert_filename (name, do_exe, do_obj)
     const char *name;
     int do_exe ATTRIBUTE_UNUSED;
     int do_obj ATTRIBUTE_UNUSED;
{
#if defined(HAVE_TARGET_EXECUTABLE_SUFFIX)
  int i;
#endif
  int len;

  if (name == NULL)
    return NULL;

  len = strlen (name);

#ifdef HAVE_TARGET_OBJECT_SUFFIX
  /* Convert x.o to x.obj if TARGET_OBJECT_SUFFIX is ".obj".  */
  if (do_obj && len > 2
      && name[len - 2] == '.'
      && name[len - 1] == 'o')
    {
      obstack_grow (&obstack, name, len - 2);
      obstack_grow0 (&obstack, TARGET_OBJECT_SUFFIX, strlen (TARGET_OBJECT_SUFFIX));
      name = obstack_finish (&obstack);
    }
#endif

#if defined(HAVE_TARGET_EXECUTABLE_SUFFIX)
  /* If there is no filetype, make it the executable suffix (which includes
     the ".").  But don't get confused if we have just "-o".  */
  if (! do_exe || TARGET_EXECUTABLE_SUFFIX[0] == 0 || (len == 2 && name[0] == '-'))
    return name;

  for (i = len - 1; i >= 0; i--)
    if (IS_DIR_SEPARATOR (name[i]))
      break;

  for (i++; i < len; i++)
    if (name[i] == '.')
      return name;

  obstack_grow (&obstack, name, len);
  obstack_grow0 (&obstack, TARGET_EXECUTABLE_SUFFIX,
                 strlen (TARGET_EXECUTABLE_SUFFIX));
  name = obstack_finish (&obstack);
#endif

  return name;
}
#endif
\f
/* Display the command line switches accepted by gcc.  */
static void
display_help ()
{
  printf (_("Usage: %s [options] file...\n"), programname);
  fputs (_("Options:\n"), stdout);

  fputs (_("  -pass-exit-codes         Exit with highest error code from a phase\n"), stdout);
  fputs (_("  --help                   Display this information\n"), stdout);
  fputs (_("  --target-help            Display target specific command line options\n"), stdout);
  if (! verbose_flag)
    fputs (_("  (Use '-v --help' to display command line options of sub-processes)\n"), stdout);
  fputs (_("  -dumpspecs               Display all of the built in spec strings\n"), stdout);
  fputs (_("  -dumpversion             Display the version of the compiler\n"), stdout);
  fputs (_("  -dumpmachine             Display the compiler's target processor\n"), stdout);
  fputs (_("  -print-search-dirs       Display the directories in the compiler's search path\n"), stdout);
  fputs (_("  -print-libgcc-file-name  Display the name of the compiler's companion library\n"), stdout);
  fputs (_("  -print-file-name=<lib>   Display the full path to library <lib>\n"), stdout);
  fputs (_("  -print-prog-name=<prog>  Display the full path to compiler component <prog>\n"), stdout);
  fputs (_("  -print-multi-directory   Display the root directory for versions of libgcc\n"), stdout);
  fputs (_("\
  -print-multi-lib         Display the mapping between command line options and\n\
                           multiple library search directories\n"), stdout);
  fputs (_("  -Wa,<options>            Pass comma-separated <options> on to the assembler\n"), stdout);
  fputs (_("  -Wp,<options>            Pass comma-separated <options> on to the preprocessor\n"), stdout);
  fputs (_("  -Wl,<options>            Pass comma-separated <options> on to the linker\n"), stdout);
  fputs (_("  -Xlinker <arg>           Pass <arg> on to the linker\n"), stdout);
  fputs (_("  -save-temps              Do not delete intermediate files\n"), stdout);
  fputs (_("  -pipe                    Use pipes rather than intermediate files\n"), stdout);
  fputs (_("  -time                    Time the execution of each subprocess\n"), stdout);
  fputs (_("  -specs=<file>            Override built-in specs with the contents of <file>\n"), stdout);
  fputs (_("  -std=<standard>          Assume that the input sources are for <standard>\n"), stdout);
  fputs (_("  -B <directory>           Add <directory> to the compiler's search paths\n"), stdout);
  fputs (_("  -b <machine>             Run gcc for target <machine>, if installed\n"), stdout);
  fputs (_("  -V <version>             Run gcc version number <version>, if installed\n"), stdout);
  fputs (_("  -v                       Display the programs invoked by the compiler\n"), stdout);
  fputs (_("  -###                     Like -v but options quoted and commands not executed\n"), stdout);
  fputs (_("  -E                       Preprocess only; do not compile, assemble or link\n"), stdout);
  fputs (_("  -S                       Compile only; do not assemble or link\n"), stdout);
  fputs (_("  -c                       Compile and assemble, but do not link\n"), stdout);
  fputs (_("  -o <file>                Place the output into <file>\n"), stdout);
  fputs (_("\
  -x <language>            Specify the language of the following input files\n\
                           Permissable languages include: c c++ assembler none\n\
                           'none' means revert to the default behavior of\n\
                           guessing the language based on the file's extension\n\
"), stdout);

  printf (_("\
\nOptions starting with -g, -f, -m, -O, -W, or --param are automatically\n\
 passed on to the various sub-processes invoked by %s.  In order to pass\n\
 other options on to these processes the -W<letter> options must be used.\n\
"), programname);

  /* The rest of the options are displayed by invocations of the various
     sub-processes.  */
}

static void
add_preprocessor_option (option, len)
     const char *option;
     int len;
{
  n_preprocessor_options++;

  if (! preprocessor_options)
    preprocessor_options
      = (char **) xmalloc (n_preprocessor_options * sizeof (char *));
  else
    preprocessor_options
      = (char **) xrealloc (preprocessor_options,
                            n_preprocessor_options * sizeof (char *));

  preprocessor_options [n_preprocessor_options - 1] =
    save_string (option, len);
}

static void
add_assembler_option (option, len)
     const char *option;
     int len;
{
  n_assembler_options++;

  if (! assembler_options)
    assembler_options
      = (char **) xmalloc (n_assembler_options * sizeof (char *));
  else
    assembler_options
      = (char **) xrealloc (assembler_options,
                            n_assembler_options * sizeof (char *));

  assembler_options [n_assembler_options - 1] = save_string (option, len);
}

static void
add_linker_option (option, len)
     const char *option;
     int len;
{
  n_linker_options++;

  if (! linker_options)
    linker_options
      = (char **) xmalloc (n_linker_options * sizeof (char *));
  else
    linker_options
      = (char **) xrealloc (linker_options,
                            n_linker_options * sizeof (char *));

  linker_options [n_linker_options - 1] = save_string (option, len);
}
\f
/* Create the vector `switches' and its contents.
   Store its length in `n_switches'.  */

static void
process_command (argc, argv)
     int argc;
     const char *const *argv;
{
  int i;
  const char *temp;
  char *temp1;
  const char *spec_lang = 0;
  int last_language_n_infiles;
  int have_c = 0;
  int have_o = 0;
  int lang_n_infiles = 0;
#ifdef MODIFY_TARGET_NAME
  int is_modify_target_name;
  int j;
#endif

  GET_ENV_PATH_LIST (gcc_exec_prefix, "GCC_EXEC_PREFIX");

  n_switches = 0;
  n_infiles = 0;
  added_libraries = 0;

  /* Figure compiler version from version string.  */

  compiler_version = temp1 = xstrdup (version_string);

  for (; *temp1; ++temp1)
    {
      if (*temp1 == ' ')
        {
          *temp1 = '\0';
          break;
        }
    }

  /* Set up the default search paths.  If there is no GCC_EXEC_PREFIX,
     see if we can create it from the pathname specified in argv[0].  */

#ifndef VMS
  /* FIXME: make_relative_prefix doesn't yet work for VMS.  */
  if (!gcc_exec_prefix)
    {
      gcc_exec_prefix = make_relative_prefix (argv[0], standard_bindir_prefix,
                                              standard_exec_prefix);
      if (gcc_exec_prefix)
        putenv (concat ("GCC_EXEC_PREFIX=", gcc_exec_prefix, NULL));
    }
#endif

  if (gcc_exec_prefix)
    {
      int len = strlen (gcc_exec_prefix);

      if (len > (int) sizeof ("/lib/gcc-lib/") - 1
          && (IS_DIR_SEPARATOR (gcc_exec_prefix[len-1])))
        {
          temp = gcc_exec_prefix + len - sizeof ("/lib/gcc-lib/") + 1;
          if (IS_DIR_SEPARATOR (*temp)
              && strncmp (temp + 1, "lib", 3) == 0
              && IS_DIR_SEPARATOR (temp[4])
              && strncmp (temp + 5, "gcc-lib", 7) == 0)
            len -= sizeof ("/lib/gcc-lib/") - 1;
        }

      set_std_prefix (gcc_exec_prefix, len);
      add_prefix (&exec_prefixes, gcc_exec_prefix, "GCC",
                  PREFIX_PRIORITY_LAST, 0, NULL);
      add_prefix (&startfile_prefixes, gcc_exec_prefix, "GCC",
                  PREFIX_PRIORITY_LAST, 0, NULL);
    }

  /* COMPILER_PATH and LIBRARY_PATH have values
     that are lists of directory names with colons.  */

  GET_ENV_PATH_LIST (temp, "COMPILER_PATH");
  if (temp)
    {
      const char *startp, *endp;
      char *nstore = (char *) alloca (strlen (temp) + 3);

      startp = endp = temp;
      while (1)
        {
          if (*endp == PATH_SEPARATOR || *endp == 0)
            {
              strncpy (nstore, startp, endp - startp);
              if (endp == startp)
                strcpy (nstore, concat (".", dir_separator_str, NULL));
              else if (!IS_DIR_SEPARATOR (endp[-1]))
                {
                  nstore[endp - startp] = DIR_SEPARATOR;
                  nstore[endp - startp + 1] = 0;
                }
              else
                nstore[endp - startp] = 0;
              add_prefix (&exec_prefixes, nstore, 0,
                          PREFIX_PRIORITY_LAST, 0, NULL);
              add_prefix (&include_prefixes,
                          concat (nstore, "include", NULL),
                          0, PREFIX_PRIORITY_LAST, 0, NULL);
              if (*endp == 0)
                break;
              endp = startp = endp + 1;
            }
          else
            endp++;
        }
    }

  GET_ENV_PATH_LIST (temp, LIBRARY_PATH_ENV);
  if (temp && *cross_compile == '0')
    {
      const char *startp, *endp;
      char *nstore = (char *) alloca (strlen (temp) + 3);

      startp = endp = temp;
      while (1)
        {
          if (*endp == PATH_SEPARATOR || *endp == 0)
            {
              strncpy (nstore, startp, endp - startp);
              if (endp == startp)
                strcpy (nstore, concat (".", dir_separator_str, NULL));
              else if (!IS_DIR_SEPARATOR (endp[-1]))
                {
                  nstore[endp - startp] = DIR_SEPARATOR;
                  nstore[endp - startp + 1] = 0;
                }
              else
                nstore[endp - startp] = 0;
              add_prefix (&startfile_prefixes, nstore, NULL,
                          PREFIX_PRIORITY_LAST, 0, NULL);
              if (*endp == 0)
                break;
              endp = startp = endp + 1;
            }
          else
            endp++;
        }
    }

  /* Use LPATH like LIBRARY_PATH (for the CMU build program).  */
  GET_ENV_PATH_LIST (temp, "LPATH");
  if (temp && *cross_compile == '0')
    {
      const char *startp, *endp;
      char *nstore = (char *) alloca (strlen (temp) + 3);

      startp = endp = temp;
      while (1)
        {
          if (*endp == PATH_SEPARATOR || *endp == 0)
            {
              strncpy (nstore, startp, endp - startp);
              if (endp == startp)
                strcpy (nstore, concat (".", dir_separator_str, NULL));
              else if (!IS_DIR_SEPARATOR (endp[-1]))
                {
                  nstore[endp - startp] = DIR_SEPARATOR;
                  nstore[endp - startp + 1] = 0;
                }
              else
                nstore[endp - startp] = 0;
              add_prefix (&startfile_prefixes, nstore, NULL,
                          PREFIX_PRIORITY_LAST, 0, NULL);
              if (*endp == 0)
                break;
              endp = startp = endp + 1;
            }
          else
            endp++;
        }
    }

  /* Convert new-style -- options to old-style.  */
  translate_options (&argc, &argv);

  /* Do language-specific adjustment/addition of flags.  */
  lang_specific_driver (&argc, &argv, &added_libraries);

  /* Scan argv twice.  Here, the first time, just count how many switches
     there will be in their vector, and how many input files in theirs.
     Also parse any switches that determine the configuration name, such as -b.
     Here we also parse the switches that cc itself uses (e.g. -v).  */

  for (i = 1; i < argc; i++)
    {
      if (! strcmp (argv[i], "-dumpspecs"))
        {
          struct spec_list *sl;
          init_spec ();
          for (sl = specs; sl; sl = sl->next)
            printf ("*%s:\n%s\n\n", sl->name, *(sl->ptr_spec));
          if (link_command_spec)
            printf ("*link_command:\n%s\n\n", link_command_spec);
          exit (0);
        }
      else if (! strcmp (argv[i], "-dumpversion"))
        {
          printf ("%s\n", spec_version);
          exit (0);
        }
      else if (! strcmp (argv[i], "-dumpmachine"))
        {
          printf ("%s\n", spec_machine);
          exit (0);
        }
      else if (strcmp (argv[i], "-fversion") == 0)
        {
          /* translate_options () has turned --version into -fversion.  */
          printf (_("%s (GCC) %s\n"), programname, version_string);
          fputs (_("Copyright (C) 2002 Free Software Foundation, Inc.\n"),
                 stdout);
          fputs (_("This is free software; see the source for copying conditions.  There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"),
                 stdout);
          exit (0);
        }
      else if (strcmp (argv[i], "-fhelp") == 0)
        {
          /* translate_options () has turned --help into -fhelp.  */
          print_help_list = 1;

          /* We will be passing a dummy file on to the sub-processes.  */
          n_infiles++;
          n_switches++;

          /* CPP driver cannot obtain switch from cc1_options.  */
          if (is_cpp_driver)
            add_preprocessor_option ("--help", 6);
          add_assembler_option ("--help", 6);
          add_linker_option ("--help", 6);
        }
      else if (strcmp (argv[i], "-ftarget-help") == 0)
        {
          /* translate_options() has turned --target-help into -ftarget-help.  */
          target_help_flag = 1;

          /* We will be passing a dummy file on to the sub-processes.  */
          n_infiles++;
          n_switches++;

          /* CPP driver cannot obtain switch from cc1_options.  */
          if (is_cpp_driver)
            add_preprocessor_option ("--target-help", 13);
          add_assembler_option ("--target-help", 13);
          add_linker_option ("--target-help", 13);
        }
      else if (! strcmp (argv[i], "-pass-exit-codes"))
        {
          pass_exit_codes = 1;
          n_switches++;
        }
      else if (! strcmp (argv[i], "-print-search-dirs"))
        print_search_dirs = 1;
      else if (! strcmp (argv[i], "-print-libgcc-file-name"))
        print_file_name = "libgcc.a";
      else if (! strncmp (argv[i], "-print-file-name=", 17))
        print_file_name = argv[i] + 17;
      else if (! strncmp (argv[i], "-print-prog-name=", 17))
        print_prog_name = argv[i] + 17;
      else if (! strcmp (argv[i], "-print-multi-lib"))
        print_multi_lib = 1;
      else if (! strcmp (argv[i], "-print-multi-directory"))
        print_multi_directory = 1;
      else if (! strncmp (argv[i], "-Wa,", 4))
        {
          int prev, j;
          /* Pass the rest of this option to the assembler.  */

          /* Split the argument at commas.  */
          prev = 4;
          for (j = 4; argv[i][j]; j++)
            if (argv[i][j] == ',')
              {
                add_assembler_option (argv[i] + prev, j - prev);
                prev = j + 1;
              }

          /* Record the part after the last comma.  */
          add_assembler_option (argv[i] + prev, j - prev);
        }
      else if (! strncmp (argv[i], "-Wp,", 4))
        {
          int prev, j;
          /* Pass the rest of this option to the preprocessor.  */

          /* Split the argument at commas.  */
          prev = 4;
          for (j = 4; argv[i][j]; j++)
            if (argv[i][j] == ',')
              {
                add_preprocessor_option (argv[i] + prev, j - prev);
                prev = j + 1;
              }

          /* Record the part after the last comma.  */
          add_preprocessor_option (argv[i] + prev, j - prev);
        }
      else if (argv[i][0] == '+' && argv[i][1] == 'e')
        /* The +e options to the C++ front-end.  */
        n_switches++;
      else if (strncmp (argv[i], "-Wl,", 4) == 0)
        {
          int j;
          /* Split the argument at commas.  */
          for (j = 3; argv[i][j]; j++)
            n_infiles += (argv[i][j] == ',');
        }
      else if (strcmp (argv[i], "-Xlinker") == 0)
        {
          if (i + 1 == argc)
            fatal ("argument to `-Xlinker' is missing");

          n_infiles++;
          i++;
        }
      else if (strcmp (argv[i], "-l") == 0)
        {
          if (i + 1 == argc)
            fatal ("argument to `-l' is missing");

          n_infiles++;
          i++;
        }
      else if (strncmp (argv[i], "-l", 2) == 0)
        n_infiles++;
      else if (strcmp (argv[i], "-save-temps") == 0)
        {
          save_temps_flag = 1;
          n_switches++;
        }
      else if (strcmp (argv[i], "-specs") == 0)
        {
          struct user_specs *user = (struct user_specs *)
            xmalloc (sizeof (struct user_specs));
          if (++i >= argc)
            fatal ("argument to `-specs' is missing");

          user->next = (struct user_specs *) 0;
          user->filename = argv[i];
          if (user_specs_tail)
            user_specs_tail->next = user;
          else
            user_specs_head = user;
          user_specs_tail = user;
        }
      else if (strncmp (argv[i], "-specs=", 7) == 0)
        {
          struct user_specs *user = (struct user_specs *)
            xmalloc (sizeof (struct user_specs));
          if (strlen (argv[i]) == 7)
            fatal ("argument to `-specs=' is missing");

          user->next = (struct user_specs *) 0;
          user->filename = argv[i] + 7;
          if (user_specs_tail)
            user_specs_tail->next = user;
          else
            user_specs_head = user;
          user_specs_tail = user;
        }
      else if (strcmp (argv[i], "-time") == 0)
        report_times = 1;
      else if (strcmp (argv[i], "-###") == 0)
        {
          /* This is similar to -v except that there is no execution
             of the commands and the echoed arguments are quoted.  It
             is intended for use in shell scripts to capture the
             driver-generated command line.  */
          verbose_only_flag++;
          verbose_flag++;
        }
      else if (argv[i][0] == '-' && argv[i][1] != 0)
        {
          const char *p = &argv[i][1];
          int c = *p;

          switch (c)
            {
            case 'b':
              n_switches++;
              if (p[1] == 0 && i + 1 == argc)
                fatal ("argument to `-b' is missing");
              if (p[1] == 0)
                spec_machine = argv[++i];
              else
                spec_machine = p + 1;

              warn_std_ptr = &warn_std;
              break;

            case 'B':
              {
                const char *value;
                int len;

                if (p[1] == 0 && i + 1 == argc)
                  fatal ("argument to `-B' is missing");
                if (p[1] == 0)
                  value = argv[++i];
                else
                  value = p + 1;