/* Collect static initialization info into data structures that can be
traversed by C++ initialization and finalization routines.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
Contributed by Chris Smith (csmith@convex.com).
Heavily modified by Michael Meissner (meissner@cygnus.com),
# define SIGCHLD SIGCLD
#endif
+/* TARGET_64BIT may be defined to use driver specific functionality. */
+#undef TARGET_64BIT
+#define TARGET_64BIT TARGET_64BIT_DEFAULT
+
#ifndef LIBRARY_PATH_ENV
#define LIBRARY_PATH_ENV "LIBRARY_PATH"
#endif
#define COLLECT
#include "collect2.h"
+#include "collect2-aix.h"
#include "demangle.h"
#include "obstack.h"
#include "intl.h"
cross-versions are in the proper directories. */
#ifdef CROSS_DIRECTORY_STRUCTURE
+#ifndef CROSS_AIX_SUPPORT
#undef OBJECT_FORMAT_COFF
+#endif
#undef MD_EXEC_PREFIX
#undef REAL_LD_FILE_NAME
#undef REAL_NM_FILE_NAME
#ifdef OBJECT_FORMAT_COFF
+#ifndef CROSS_DIRECTORY_STRUCTURE
#include <a.out.h>
#include <ar.h>
#endif
#include <ldfcn.h>
+#endif
/* Some systems have an ISCOFF macro, but others do not. In some cases
the macro may be wrong. MY_ISCOFF is defined in tm.h files for machines
int do_collecting = 0;
#endif
+/* Cook up an always defined indication of whether we proceed the
+ "EXPORT_LIST" way. */
+
+#ifdef COLLECT_EXPORT_LIST
+#define DO_COLLECT_EXPORT_LIST 1
+#else
+#define DO_COLLECT_EXPORT_LIST 0
+#endif
+
/* Nonzero if we should suppress the automatic demangling of identifiers
in linker error messages. Set from COLLECT_NO_DEMANGLE. */
int no_demangle;
int number;
};
-/* Enumeration giving which pass this is for scanning the program file. */
-
-enum pass {
- PASS_FIRST, /* without constructors */
- PASS_OBJ, /* individual objects */
- PASS_LIB, /* looking for shared libraries */
- PASS_SECOND /* with constructors linked in */
-};
-
-int vflag; /* true if -v */
+bool vflag; /* true if -v or --version */
static int rflag; /* true if -r */
static int strip_flag; /* true if -s */
static const char *demangle_flag;
static int aixrtl_flag; /* true if -brtl */
#endif
-int debug; /* true if -debug */
+enum lto_mode_d {
+ LTO_MODE_NONE, /* Not doing LTO. */
+ LTO_MODE_LTO, /* Normal LTO. */
+ LTO_MODE_WHOPR /* WHOPR. */
+};
+
+/* Current LTO mode. */
+static enum lto_mode_d lto_mode = LTO_MODE_NONE;
+
+bool debug; /* true if -debug */
+bool helpflag; /* true if --help */
static int shared_obj; /* true if -shared */
#ifdef COLLECT_EXPORT_LIST
static const char *export_file; /* <xxx>.x for AIX export list. */
#endif
+static char **lto_o_files; /* Output files for LTO. */
const char *ldout; /* File for ld stdout. */
const char *lderrout; /* File for ld stderr. */
static const char *output_file; /* Output file for ld. */
struct obstack temporary_obstack;
char * temporary_firstobj;
+/* A string that must be prepended to a target OS path in order to find
+ it on the host system. */
+#ifdef TARGET_SYSTEM_ROOT
+static const char *target_system_root = TARGET_SYSTEM_ROOT;
+#else
+static const char *target_system_root = "";
+#endif
+
/* Structure to hold all the directories in which to search for files to
execute. */
&libpath_lib_dirs, NULL};
#endif
+/* List of names of object files containing LTO information.
+ These are a subset of the object file names appearing on the
+ command line, and must be identical, in the sense of pointer
+ equality, with the names passed to maybe_run_lto_and_relink(). */
+
+struct lto_object
+{
+ const char *name; /* Name of object file. */
+ struct lto_object *next; /* Next in linked list. */
+};
+
+struct lto_object_list
+{
+ struct lto_object *first; /* First list element. */
+ struct lto_object *last; /* Last list element. */
+};
+
+static struct lto_object_list lto_objects;
+
/* Special kinds of symbols that a name may denote. */
typedef enum {
static void do_wait (const char *, struct pex_obj *);
static void fork_execute (const char *, char **);
static void maybe_unlink (const char *);
+static void maybe_unlink_list (char **);
static void add_to_list (struct head *, const char *);
static int extract_init_priority (const char *);
static void sort_ids (struct head *);
#ifndef LD_INIT_SWITCH
static void write_c_file_glob (FILE *, const char *);
#endif
-static void scan_prog_file (const char *, enum pass);
#ifdef SCAN_LIBRARIES
static void scan_libraries (const char *);
#endif
static char *resolve_lib_name (const char *);
#endif
static char *extract_string (const char **);
+
+/* Enumerations describing which pass this is for scanning the
+ program file ... */
+
+typedef enum {
+ PASS_FIRST, /* without constructors */
+ PASS_OBJ, /* individual objects */
+ PASS_LIB, /* looking for shared libraries */
+ PASS_SECOND, /* with constructors linked in */
+ PASS_LTOINFO /* looking for objects with LTO info */
+} scanpass;
+
+/* ... and which kinds of symbols are to be considered. */
+
+enum scanfilter_masks {
+ SCAN_NOTHING = 0,
+
+ SCAN_CTOR = 1 << SYM_CTOR,
+ SCAN_DTOR = 1 << SYM_DTOR,
+ SCAN_INIT = 1 << SYM_INIT,
+ SCAN_FINI = 1 << SYM_FINI,
+ SCAN_DWEH = 1 << SYM_DWEH,
+ SCAN_ALL = ~0
+};
+
+/* This type is used for parameters and variables which hold
+ combinations of the flags in enum scanfilter_masks. */
+typedef int scanfilter;
+
+/* Scan the name list of the loaded program for the symbols g++ uses for
+ static constructors and destructors.
+
+ The SCANPASS argument tells which collect processing pass this is for and
+ the SCANFILTER argument tells which kinds of symbols to consider in this
+ pass. Symbols of a special kind not in the filter mask are considered as
+ regular ones.
+
+ The constructor table begins at __CTOR_LIST__ and contains a count of the
+ number of pointers (or -1 if the constructors are built in a separate
+ section by the linker), followed by the pointers to the constructor
+ functions, terminated with a null pointer. The destructor table has the
+ same format, and begins at __DTOR_LIST__. */
+
+static void scan_prog_file (const char *, scanpass, scanfilter);
+
\f
/* Delete tempfiles and exit function. */
maybe_unlink (export_file);
#endif
+ if (lto_o_files)
+ maybe_unlink_list (lto_o_files);
+
if (ldout != 0 && ldout[0])
{
dump_file (ldout, stdout);
va_end (ap);
}
+/* Notify user of a non-error, without translating the format string. */
+void
+notice_translated (const char *cmsgid, ...)
+{
+ va_list ap;
+
+ va_start (ap, cmsgid);
+ vfprintf (stderr, cmsgid, ap);
+ va_end (ap);
+}
+
/* Die when sys call fails. */
void
maybe_unlink (export_file);
#endif
+ if (lto_o_files)
+ maybe_unlink_list (lto_o_files);
+
if (response_file)
maybe_unlink (response_file);
static symkind
is_ctor_dtor (const char *s)
{
- struct names { const char *const name; const int len; const int ret;
+ struct names { const char *const name; const int len; symkind ret;
const int two_underscores; };
const struct names *p;
}
free (nstore);
}
+
+#ifdef OBJECT_FORMAT_NONE
+
+/* Add an entry for the object file NAME to object file list LIST.
+ New entries are added at the end of the list. The original pointer
+ value of NAME is preserved, i.e., no string copy is performed. */
+
+static void
+add_lto_object (struct lto_object_list *list, const char *name)
+{
+ struct lto_object *n = XNEW (struct lto_object);
+ n->name = name;
+ n->next = NULL;
+
+ if (list->last)
+ list->last->next = n;
+ else
+ list->first = n;
+
+ list->last = n;
+}
+#endif /* OBJECT_FORMAT_NONE */
+
+
+/* Perform a link-time recompilation and relink if any of the object
+ files contain LTO info. The linker command line LTO_LD_ARGV
+ represents the linker command that would produce a final executable
+ without the use of LTO. OBJECT_LST is a vector of object file names
+ appearing in LTO_LD_ARGV that are to be considerd for link-time
+ recompilation, where OBJECT is a pointer to the last valid element.
+ (This awkward convention avoids an impedance mismatch with the
+ usage of similarly-named variables in main().) The elements of
+ OBJECT_LST must be identical, i.e., pointer equal, to the
+ corresponding arguments in LTO_LD_ARGV.
+
+ Upon entry, at least one linker run has been performed without the
+ use of any LTO info that might be present. Any recompilations
+ necessary for template instantiations have been performed, and
+ initializer/finalizer tables have been created if needed and
+ included in the linker command line LTO_LD_ARGV. If any of the
+ object files contain LTO info, we run the LTO back end on all such
+ files, and perform the final link with the LTO back end output
+ substituted for the LTO-optimized files. In some cases, a final
+ link with all link-time generated code has already been performed,
+ so there is no need to relink if no LTO info is found. In other
+ cases, our caller has not produced the final executable, and is
+ relying on us to perform the required link whether LTO info is
+ present or not. In that case, the FORCE argument should be true.
+ Note that the linker command line argument LTO_LD_ARGV passed into
+ this function may be modified in place. */
+
+static void
+maybe_run_lto_and_relink (char **lto_ld_argv, char **object_lst,
+ const char **object, bool force)
+{
+ const char **object_file = CONST_CAST2 (const char **, char **, object_lst);
+
+ int num_lto_c_args = 1; /* Allow space for the terminating NULL. */
+
+ while (object_file < object)
+ {
+ /* If file contains LTO info, add it to the list of LTO objects. */
+ scan_prog_file (*object_file++, PASS_LTOINFO, SCAN_ALL);
+
+ /* Increment the argument count by the number of object file arguments
+ we will add. An upper bound suffices, so just count all of the
+ object files regardless of whether they contain LTO info. */
+ num_lto_c_args++;
+ }
+
+ if (lto_objects.first)
+ {
+ const char *opts;
+ char **lto_c_argv;
+ const char **lto_c_ptr;
+ const char *cp;
+ const char **p, **q, **r;
+ const char **lto_o_ptr;
+ struct lto_object *list;
+ char *lto_wrapper = getenv ("COLLECT_LTO_WRAPPER");
+ struct pex_obj *pex;
+ const char *prog = "lto-wrapper";
+
+ if (!lto_wrapper)
+ fatal ("COLLECT_LTO_WRAPPER must be set.");
+
+ /* There is at least one object file containing LTO info,
+ so we need to run the LTO back end and relink. */
+
+ /* Get compiler options passed down from the parent `gcc' command.
+ These must be passed to the LTO back end. */
+ opts = getenv ("COLLECT_GCC_OPTIONS");
+
+ /* Increment the argument count by the number of inherited options.
+ Some arguments may be filtered out later. Again, an upper bound
+ suffices. */
+
+ cp = opts;
+
+ while (cp && *cp)
+ {
+ extract_string (&cp);
+ num_lto_c_args++;
+ }
+ obstack_free (&temporary_obstack, temporary_firstobj);
+
+ if (debug)
+ num_lto_c_args++;
+
+ /* Increment the argument count by the number of initial
+ arguments added below. */
+ num_lto_c_args += 9;
+
+ lto_c_argv = (char **) xcalloc (sizeof (char *), num_lto_c_args);
+ lto_c_ptr = CONST_CAST2 (const char **, char **, lto_c_argv);
+
+ *lto_c_ptr++ = lto_wrapper;
+ *lto_c_ptr++ = c_file_name;
+
+ cp = opts;
+
+ while (cp && *cp)
+ {
+ const char *s = extract_string (&cp);
+
+ /* Pass the option or argument to the wrapper. */
+ *lto_c_ptr++ = xstrdup (s);
+ }
+ obstack_free (&temporary_obstack, temporary_firstobj);
+
+ if (debug)
+ *lto_c_ptr++ = xstrdup ("-debug");
+
+ /* Add LTO objects to the wrapper command line. */
+ for (list = lto_objects.first; list; list = list->next)
+ *lto_c_ptr++ = list->name;
+
+ *lto_c_ptr = NULL;
+
+ /* Run the LTO back end. */
+ pex = collect_execute (prog, lto_c_argv, NULL, NULL, PEX_SEARCH);
+ {
+ int c;
+ FILE *stream;
+ size_t i, num_files;
+ char *start, *end;
+
+ stream = pex_read_output (pex, 0);
+ gcc_assert (stream);
+
+ num_files = 0;
+ while ((c = getc (stream)) != EOF)
+ {
+ obstack_1grow (&temporary_obstack, c);
+ if (c == '\n')
+ ++num_files;
+ }
+
+ lto_o_files = XNEWVEC (char *, num_files + 1);
+ lto_o_files[num_files] = NULL;
+ start = XOBFINISH (&temporary_obstack, char *);
+ for (i = 0; i < num_files; ++i)
+ {
+ end = start;
+ while (*end != '\n')
+ ++end;
+ *end = '\0';
+
+ lto_o_files[i] = xstrdup (start);
+
+ start = end + 1;
+ }
+
+ obstack_free (&temporary_obstack, temporary_firstobj);
+ }
+ do_wait (prog, pex);
+ pex = NULL;
+
+ /* After running the LTO back end, we will relink, substituting
+ the LTO output for the object files that we submitted to the
+ LTO. Here, we modify the linker command line for the relink. */
+ p = CONST_CAST2 (const char **, char **, lto_ld_argv);
+ lto_o_ptr = CONST_CAST2 (const char **, char **, lto_o_files);
+
+ while (*p != NULL)
+ {
+ for (list = lto_objects.first; list; list = list->next)
+ {
+ if (*p == list->name) /* Note test for pointer equality! */
+ {
+ /* Excise argument from linker command line. */
+ if (*lto_o_ptr)
+ {
+ /* Replace first argument with LTO output file. */
+ *p++ = *lto_o_ptr++;
+ }
+ else
+ {
+ /* Move following arguments one position earlier,
+ overwriting the current argument. */
+ q = p;
+ r = p + 1;
+ while (*r != NULL)
+ *q++ = *r++;
+ *q = NULL;
+ }
+
+ /* No need to continue searching the LTO object list. */
+ break;
+ }
+ }
+
+ /* If we didn't find a match, move on to the next argument.
+ Otherwise, P has been set to the correct argument position
+ at which to continue. */
+ if (!list) ++p;
+ }
+
+ /* The code above assumes we will never have more lto output files than
+ input files. Otherwise, we need to resize lto_ld_argv. Check this
+ assumption. */
+ if (*lto_o_ptr)
+ fatal ("too many lto output files");
+
+ /* Run the linker again, this time replacing the object files
+ optimized by the LTO with the temporary file generated by the LTO. */
+ fork_execute ("ld", lto_ld_argv);
+
+ maybe_unlink_list (lto_o_files);
+ }
+ else if (force)
+ {
+ /* Our caller is relying on us to do the link
+ even though there is no LTO back end work to be done. */
+ fork_execute ("ld", lto_ld_argv);
+ }
+}
\f
/* Main program. */
main (int argc, char **argv)
{
static const char *const ld_suffix = "ld";
+ static const char *const plugin_ld_suffix = PLUGIN_LD;
static const char *const real_ld_suffix = "real-ld";
static const char *const collect_ld_suffix = "collect-ld";
static const char *const nm_suffix = "nm";
const char *const full_ld_suffix =
concat(target_machine, "-", ld_suffix, NULL);
+ const char *const full_plugin_ld_suffix =
+ concat(target_machine, "-", plugin_ld_suffix, NULL);
const char *const full_nm_suffix =
concat (target_machine, "-", nm_suffix, NULL);
const char *const full_gnm_suffix =
concat (target_machine, "-", gstrip_suffix, NULL);
#else
const char *const full_ld_suffix = ld_suffix;
+ const char *const full_plugin_ld_suffix = plugin_ld_suffix;
const char *const full_nm_suffix = nm_suffix;
const char *const full_gnm_suffix = gnm_suffix;
#ifdef LDD_SUFFIX
const char **c_ptr;
char **ld1_argv;
const char **ld1;
+ bool use_plugin = false;
+
+ /* The kinds of symbols we will have to consider when scanning the
+ outcome of a first pass link. This is ALL to start with, then might
+ be adjusted before getting to the first pass link per se, typically on
+ AIX where we perform an early scan of objects and libraries to fetch
+ the list of global ctors/dtors and make sure they are not garbage
+ collected. */
+ scanfilter ld1_filter = SCAN_ALL;
+
char **ld2_argv;
const char **ld2;
char **object_lst;
int num_c_args;
char **old_argv;
+ bool use_verbose = false;
+
old_argv = argv;
expandargv (&argc, &argv);
if (argv != old_argv)
/* Do not invoke xcalloc before this point, since locale needs to be
set first, in case a diagnostic is issued. */
- ld1 = (const char **)(ld1_argv = XCNEWVEC (char *, argc+4));
- ld2 = (const char **)(ld2_argv = XCNEWVEC (char *, argc+11));
- object = (const char **)(object_lst = XCNEWVEC (char *, argc));
+ ld1_argv = XCNEWVEC (char *, argc + 4);
+ ld1 = CONST_CAST2 (const char **, char **, ld1_argv);
+ ld2_argv = XCNEWVEC (char *, argc + 11);
+ ld2 = CONST_CAST2 (const char **, char **, ld2_argv);
+ object_lst = XCNEWVEC (char *, argc);
+ object = CONST_CAST2 (const char **, char **, object_lst);
#ifdef DEBUG
debug = 1;
/* Parse command line early for instances of -debug. This allows
the debug flag to be set before functions like find_a_file()
- are called. */
+ are called. We also look for the -flto or -fwhopr flag to know
+ what LTO mode we are in. */
{
int i;
for (i = 1; argv[i] != NULL; i ++)
{
if (! strcmp (argv[i], "-debug"))
- debug = 1;
+ debug = true;
+ else if (! strcmp (argv[i], "-flto") && ! use_plugin)
+ {
+ use_verbose = true;
+ lto_mode = LTO_MODE_LTO;
+ }
+ else if (! strcmp (argv[i], "-fwhopr") && ! use_plugin)
+ {
+ use_verbose = true;
+ lto_mode = LTO_MODE_WHOPR;
+ }
+ else if (! strcmp (argv[i], "-plugin"))
+ {
+ use_plugin = true;
+ use_verbose = true;
+ lto_mode = LTO_MODE_NONE;
+ }
+#ifdef COLLECT_EXPORT_LIST
+ /* since -brtl, -bexport, -b64 are not position dependent
+ also check for them here */
+ if ((argv[i][0] == '-') && (argv[i][1] == 'b'))
+ {
+ arg = argv[i];
+ /* We want to disable automatic exports on AIX when user
+ explicitly puts an export list in command line */
+ if (arg[2] == 'E' || strncmp (&arg[2], "export", 6) == 0)
+ export_flag = 1;
+ else if (arg[2] == '6' && arg[3] == '4')
+ aix64_flag = 1;
+ else if (arg[2] == 'r' && arg[3] == 't' && arg[4] == 'l')
+ aixrtl_flag = 1;
+ }
+#endif
}
vflag = debug;
}
obstack_free (&temporary_obstack, temporary_firstobj);
/* -fno-profile-arcs -fno-test-coverage -fno-branch-probabilities
- -fno-exceptions -w */
- num_c_args += 5;
+ -fno-exceptions -w -fno-whole-program */
+ num_c_args += 6;
- c_ptr = (const char **) (c_argv = XCNEWVEC (char *, num_c_args));
+ c_argv = XCNEWVEC (char *, num_c_args);
+ c_ptr = CONST_CAST2 (const char **, char **, c_argv);
if (argc < 2)
fatal ("no arguments");
/* Search the compiler directories for `ld'. We have protection against
recursive calls in find_a_file. */
if (ld_file_name == 0)
- ld_file_name = find_a_file (&cpath, ld_suffix);
+ ld_file_name = find_a_file (&cpath,
+ use_plugin
+ ? plugin_ld_suffix
+ : ld_suffix);
/* Search the ordinary system bin directories
for `ld' (if native linking) or `TARGET-ld' (if cross). */
if (ld_file_name == 0)
- ld_file_name = find_a_file (&path, full_ld_suffix);
+ ld_file_name = find_a_file (&path,
+ use_plugin
+ ? full_plugin_ld_suffix
+ : full_ld_suffix);
#ifdef REAL_NM_FILE_NAME
nm_file_name = find_a_file (&path, REAL_NM_FILE_NAME);
*c_ptr++ = xstrdup (q);
}
}
+ if (use_verbose && *q == '-' && q[1] == 'v' && q[2] == 0)
+ {
+ /* Turn on trace in collect2 if needed. */
+ vflag = true;
+ }
}
obstack_free (&temporary_obstack, temporary_firstobj);
*c_ptr++ = "-fno-profile-arcs";
*c_ptr++ = "-fno-branch-probabilities";
*c_ptr++ = "-fno-exceptions";
*c_ptr++ = "-w";
+ *c_ptr++ = "-fno-whole-program";
/* !!! When GCC calls collect2,
it does not know whether it is calling collect2 or ld.
{
switch (arg[1])
{
-#ifdef COLLECT_EXPORT_LIST
- /* We want to disable automatic exports on AIX when user
- explicitly puts an export list in command line */
- case 'b':
- if (arg[2] == 'E' || strncmp (&arg[2], "export", 6) == 0)
- export_flag = 1;
- else if (arg[2] == '6' && arg[3] == '4')
- aix64_flag = 1;
- else if (arg[2] == 'r' && arg[3] == 't' && arg[4] == 'l')
- aixrtl_flag = 1;
- break;
-#endif
-
case 'd':
if (!strcmp (arg, "-debug"))
{
}
break;
+ case 'f':
+ if (strcmp (arg, "-flto") == 0 || strcmp (arg, "-fwhopr") == 0)
+ {
+#ifdef ENABLE_LTO
+ /* Do not pass LTO flag to the linker. */
+ ld1--;
+ ld2--;
+#else
+ error ("LTO support has not been enabled in this "
+ "configuration");
+#endif
+ }
+ break;
+
case 'l':
if (first_file)
{
#else
#if LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
case 'L':
- if (is_in_args (arg, (const char **) ld1_argv, ld1-1))
+ if (is_in_args (arg,
+ CONST_CAST2 (const char **, char **, ld1_argv),
+ ld1 - 1))
--ld1;
break;
#endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
case 'v':
if (arg[2] == '\0')
- vflag = 1;
+ vflag = true;
break;
case '-':
ld1--;
ld2--;
}
+ else if (strncmp (arg, "--sysroot=", 10) == 0)
+ target_system_root = arg + 10;
+ else if (strncmp (arg, "--version", 9) == 0)
+ vflag = true;
+ else if (strncmp (arg, "--help", 9) == 0)
+ helpflag = true;
break;
}
}
}
/* The AIX linker will discard static constructors in object files if
- nothing else in the file is referenced, so look at them first. */
+ nothing else in the file is referenced, so look at them first. Unless
+ we are building a shared object, ignore the eh frame tables, as we
+ would otherwise reference them all, hence drag all the corresponding
+ objects even if nothing else is referenced. */
{
- const char **export_object_lst = (const char **)object_lst;
+ const char **export_object_lst
+ = CONST_CAST2 (const char **, char **, object_lst);
- while (export_object_lst < object)
- scan_prog_file (*export_object_lst++, PASS_OBJ);
- }
- {
struct id *list = libs.first;
+ /* Compute the filter to use from the current one, do scan, then adjust
+ the "current" filter to remove what we just included here. This will
+ control whether we need a first pass link later on or not, and what
+ will remain to be scanned there. */
+
+ scanfilter this_filter = ld1_filter;
+#if HAVE_AS_REF
+ if (!shared_obj)
+ this_filter &= ~SCAN_DWEH;
+#endif
+
+ while (export_object_lst < object)
+ scan_prog_file (*export_object_lst++, PASS_OBJ, this_filter);
+
for (; list; list = list->next)
- scan_prog_file (list->name, PASS_FIRST);
+ scan_prog_file (list->name, PASS_FIRST, this_filter);
+
+ ld1_filter = ld1_filter & ~this_filter;
}
if (exports.first)
fprintf (stderr, "\n");
}
+ if (helpflag)
+ {
+ fprintf (stderr, "Usage: collect2 [options]\n");
+ fprintf (stderr, " Wrap linker and generate constructor code if needed.\n");
+ fprintf (stderr, " Options:\n");
+ fprintf (stderr, " -debug Enable debug output\n");
+ fprintf (stderr, " --help Display this information\n");
+ fprintf (stderr, " -v, --version Display this program's version number\n");
+ fprintf (stderr, "Overview: http://gcc.gnu.org/onlinedocs/gccint/Collect2.html\n");
+ fprintf (stderr, "Report bugs: %s\n", bug_report_url);
+
+ collect_exit (0);
+ }
+
if (debug)
{
const char *ptr;
}
/* Load the program, searching all libraries and attempting to provide
- undefined symbols from repository information. */
+ undefined symbols from repository information.
- /* On AIX we do this later. */
-#ifndef COLLECT_EXPORT_LIST
- do_tlink (ld1_argv, object_lst);
-#endif
-
- /* If -r or they will be run via some other method, do not build the
+ If -r or they will be run via some other method, do not build the
constructor or destructor list, just return now. */
- if (rflag
-#ifndef COLLECT_EXPORT_LIST
- || ! do_collecting
-#endif
- )
- {
-#ifdef COLLECT_EXPORT_LIST
- /* Do the link we avoided above if we are exiting. */
+ {
+ bool early_exit
+ = rflag || (! DO_COLLECT_EXPORT_LIST && ! do_collecting);
+
+ /* Perform the first pass link now, if we're about to exit or if we need
+ to scan for things we haven't collected yet before pursuing further.
+
+ On AIX, the latter typically includes nothing for shared objects or
+ frame tables for an executable, out of what the required early scan on
+ objects and libraries has performed above. In the !shared_obj case, we
+ expect the relevant tables to be dragged together with their associated
+ functions from precise cross reference insertions by the compiler. */
+
+ if (early_exit || ld1_filter != SCAN_NOTHING)
do_tlink (ld1_argv, object_lst);
- /* But make sure we delete the export file we may have created. */
- if (export_file != 0 && export_file[0])
- maybe_unlink (export_file);
+ if (early_exit)
+ {
+#ifdef COLLECT_EXPORT_LIST
+ /* Make sure we delete the export file we may have created. */
+ if (export_file != 0 && export_file[0])
+ maybe_unlink (export_file);
#endif
- maybe_unlink (c_file);
- maybe_unlink (o_file);
- return 0;
- }
+ if (lto_mode)
+ maybe_run_lto_and_relink (ld1_argv, object_lst, object, false);
- /* Examine the namelist with nm and search it for static constructors
- and destructors to call.
- Write the constructor and destructor tables to a .s file and reload. */
+ maybe_unlink (c_file);
+ maybe_unlink (o_file);
+ return 0;
+ }
+ }
- /* On AIX we already scanned for global constructors/destructors. */
-#ifndef COLLECT_EXPORT_LIST
- scan_prog_file (output_file, PASS_FIRST);
-#endif
+ /* Unless we have done it all already, examine the namelist and search for
+ static constructors and destructors to call. Write the constructor and
+ destructor tables to a .s file and reload. */
+
+ if (ld1_filter != SCAN_NOTHING)
+ scan_prog_file (output_file, PASS_FIRST, ld1_filter);
#ifdef SCAN_LIBRARIES
scan_libraries (output_file);
if (debug)
{
- notice ("%d constructor(s) found\n", constructors.number);
- notice ("%d destructor(s) found\n", destructors.number);
- notice ("%d frame table(s) found\n", frame_tables.number);
+ notice_translated (ngettext ("%d constructor found\n",
+ "%d constructors found\n",
+ constructors.number),
+ constructors.number);
+ notice_translated (ngettext ("%d destructor found\n",
+ "%d destructors found\n",
+ destructors.number),
+ destructors.number);
+ notice_translated (ngettext("%d frame table found\n",
+ "%d frame tables found\n",
+ frame_tables.number),
+ frame_tables.number);
}
+ /* If the scan exposed nothing of special interest, there's no need to
+ generate the glue code and relink so return now. */
+
if (constructors.number == 0 && destructors.number == 0
&& frame_tables.number == 0
#if defined (SCAN_LIBRARIES) || defined (COLLECT_EXPORT_LIST)
#endif
)
{
-#ifdef COLLECT_EXPORT_LIST
- /* Do tlink without additional code generation. */
- do_tlink (ld1_argv, object_lst);
-#endif
+ /* Do tlink without additional code generation now if we didn't
+ do it earlier for scanning purposes. */
+ if (ld1_filter == SCAN_NOTHING)
+ do_tlink (ld1_argv, object_lst);
+
+ if (lto_mode)
+ maybe_run_lto_and_relink (ld1_argv, object_lst, object, false);
+
/* Strip now if it was requested on the command line. */
if (strip_flag)
{
char **real_strip_argv = XCNEWVEC (char *, 3);
- const char ** strip_argv = (const char **) real_strip_argv;
+ const char ** strip_argv = CONST_CAST2 (const char **, char **,
+ real_strip_argv);
strip_argv[0] = strip_file_name;
strip_argv[1] = output_file;
#ifdef COLLECT_EXPORT_LIST
/* On AIX we must call tlink because of possible templates resolution. */
do_tlink (ld2_argv, object_lst);
+
+ if (lto_mode)
+ maybe_run_lto_and_relink (ld2_argv, object_lst, object, false);
#else
/* Otherwise, simply call ld because tlink is already done. */
- fork_execute ("ld", ld2_argv);
+ if (lto_mode)
+ maybe_run_lto_and_relink (ld2_argv, object_lst, object, true);
+ else
+ fork_execute ("ld", ld2_argv);
/* Let scan_prog_file do any final mods (OSF/rose needs this for
constructors/destructors in shared libraries. */
- scan_prog_file (output_file, PASS_SECOND);
+ scan_prog_file (output_file, PASS_SECOND, SCAN_ALL);
#endif
maybe_unlink (c_file);
struct pex_obj *
collect_execute (const char *prog, char **argv, const char *outname,
- const char *errname)
+ const char *errname, int flags)
{
struct pex_obj *pex;
const char *errmsg;
if (pex == NULL)
fatal_perror ("pex_init failed");
- errmsg = pex_run (pex, PEX_LAST | PEX_SEARCH, argv[0], argv, outname,
+ errmsg = pex_run (pex, flags, argv[0], argv, outname,
errname, &err);
if (errmsg != NULL)
{
{
struct pex_obj *pex;
- pex = collect_execute (prog, argv, NULL, NULL);
+ pex = collect_execute (prog, argv, NULL, NULL, PEX_LAST | PEX_SEARCH);
do_wait (prog, pex);
}
\f
notice ("[Leaving %s]\n", file);
}
+/* Call maybe_unlink on the NULL-terminated list, FILE_LIST. */
+
+static void
+maybe_unlink_list (char **file_list)
+{
+ char **tmp = file_list;
+
+ while (*tmp)
+ maybe_unlink (*(tmp++));
+}
+
\f
static long sequence_number = 0;
\f
#ifdef OBJECT_FORMAT_NONE
-/* Generic version to scan the name list of the loaded program for
- the symbols g++ uses for static constructors and destructors.
+/* Check to make sure the file is an ELF file. LTO objects must
+ be in ELF format. */
+
+static bool
+is_elf_or_coff (const char *prog_name)
+{
+ FILE *f;
+ char buf[4];
+ static char magic[4] = { 0x7f, 'E', 'L', 'F' };
+ static char coffmag[2] = { 0x4c, 0x01 };
+
+ f = fopen (prog_name, "rb");
+ if (f == NULL)
+ return false;
+ if (fread (buf, sizeof (buf), 1, f) != 1)
+ buf[0] = 0;
+ fclose (f);
+ return memcmp (buf, magic, sizeof (magic)) == 0
+ || memcmp (buf, coffmag, sizeof (coffmag)) == 0;
+}
- The constructor table begins at __CTOR_LIST__ and contains a count
- of the number of pointers (or -1 if the constructors are built in a
- separate section by the linker), followed by the pointers to the
- constructor functions, terminated with a null pointer. The
- destructor table has the same format, and begins at __DTOR_LIST__. */
+/* Generic version to scan the name list of the loaded program for
+ the symbols g++ uses for static constructors and destructors. */
static void
-scan_prog_file (const char *prog_name, enum pass which_pass)
+scan_prog_file (const char *prog_name, scanpass which_pass,
+ scanfilter filter)
{
void (*int_handler) (int);
#ifdef SIGQUIT
void (*quit_handler) (int);
#endif
char *real_nm_argv[4];
- const char **nm_argv = (const char **) real_nm_argv;
+ const char **nm_argv = CONST_CAST2 (const char **, char**, real_nm_argv);
int argc = 0;
struct pex_obj *pex;
const char *errmsg;
int err;
char *p, buf[1024];
FILE *inf;
+ int found_lto = 0;
if (which_pass == PASS_SECOND)
return;
+ /* LTO objects must be in a known format. This check prevents
+ us from accepting an archive containing LTO objects, which
+ gcc cannnot currently handle. */
+ if (which_pass == PASS_LTOINFO && !is_elf_or_coff (prog_name))
+ return;
+
/* If we do not have an `nm', complain. */
if (nm_file_name == 0)
fatal ("cannot find 'nm'");
if (pex == NULL)
fatal_perror ("pex_init failed");
- errmsg = pex_run (pex, 0, nm_file_name, real_nm_argv, NULL, NULL, &err);
+ errmsg = pex_run (pex, 0, nm_file_name, real_nm_argv, NULL, HOST_BIT_BUCKET,
+ &err);
if (errmsg != NULL)
{
if (err != 0)
fatal_perror ("can't open nm output");
if (debug)
- fprintf (stderr, "\nnm output with constructors/destructors.\n");
+ {
+ if (which_pass == PASS_LTOINFO)
+ fprintf (stderr, "\nnm output with LTO info marker symbol.\n");
+ else
+ fprintf (stderr, "\nnm output with constructors/destructors.\n");
+ }
/* Read each line of nm output. */
while (fgets (buf, sizeof buf, inf) != (char *) 0)
int ch, ch2;
char *name, *end;
+ if (debug)
+ fprintf (stderr, "\t%s\n", buf);
+
+ if (which_pass == PASS_LTOINFO)
+ {
+ if (found_lto)
+ continue;
+
+ /* Look for the LTO info marker symbol, and add filename to
+ the LTO objects list if found. */
+ for (p = buf; (ch = *p) != '\0' && ch != '\n'; p++)
+ if (ch == ' ' && p[1] == '_' && p[2] == '_'
+ && (strncmp (p + (p[3] == '_' ? 2 : 1), "__gnu_lto_v1", 12) == 0)
+ && ISSPACE (p[p[3] == '_' ? 14 : 13]))
+ {
+ add_lto_object (<o_objects, prog_name);
+
+ /* We need to read all the input, so we can't just
+ return here. But we can avoid useless work. */
+ found_lto = 1;
+
+ break;
+ }
+
+ continue;
+ }
+
/* If it contains a constructor or destructor name, add the name
- to the appropriate list. */
+ to the appropriate list unless this is a kind of symbol we're
+ not supposed to even consider. */
for (p = buf; (ch = *p) != '\0' && ch != '\n' && ch != '_'; p++)
if (ch == ' ' && p[1] == 'U' && p[2] == ' ')
switch (is_ctor_dtor (name))
{
case SYM_CTOR:
+ if (! (filter & SCAN_CTOR))
+ break;
if (which_pass != PASS_LIB)
add_to_list (&constructors, name);
break;
case SYM_DTOR:
+ if (! (filter & SCAN_DTOR))
+ break;
if (which_pass != PASS_LIB)
add_to_list (&destructors, name);
break;
case SYM_INIT:
+ if (! (filter & SCAN_INIT))
+ break;
if (which_pass != PASS_LIB)
fatal ("init function found in object %s", prog_name);
#ifndef LD_INIT_SWITCH
break;
case SYM_FINI:
+ if (! (filter & SCAN_FINI))
+ break;
if (which_pass != PASS_LIB)
fatal ("fini function found in object %s", prog_name);
#ifndef LD_FINI_SWITCH
break;
case SYM_DWEH:
+ if (! (filter & SCAN_DWEH))
+ break;
if (which_pass != PASS_LIB)
add_to_list (&frame_tables, name);
break;
default: /* not a constructor or destructor */
continue;
}
-
- if (debug)
- fprintf (stderr, "\t%s\n", buf);
}
if (debug)
void (*quit_handler) (int);
#endif
char *real_ldd_argv[4];
- const char **ldd_argv = (const char **) real_ldd_argv;
+ const char **ldd_argv = CONST_CAST2 (const char **, char **, real_ldd_argv);
int argc = 0;
struct pex_obj *pex;
const char *errmsg;
/* Now iterate through the library list adding their symbols to
the list. */
for (list = libraries.first; list; list = list->next)
- scan_prog_file (list->name, PASS_LIB);
+ scan_prog_file (list->name, PASS_LIB, SCAN_ALL);
}
#endif /* LDD_SUFFIX */
# define GCC_SYMZERO(X) 0
/* 0757 = U803XTOCMAGIC (AIX 4.3) and 0767 = U64_TOCMAGIC (AIX V5) */
-#ifdef _AIX51
+#if TARGET_AIX_VERSION >= 51
# define GCC_CHECK_HDR(X) \
((HEADER (X).f_magic == U802TOCMAGIC && ! aix64_flag) \
|| (HEADER (X).f_magic == 0767 && aix64_flag))
static int
ignore_library (const char *name)
{
- const char *const *p = &aix_std_libs[0];
- while (*p++ != NULL)
- if (! strcmp (name, *p)) return 1;
+ const char *const *p;
+ size_t length;
+
+ if (target_system_root[0] != '\0')
+ {
+ length = strlen (target_system_root);
+ if (strncmp (name, target_system_root, length) != 0)
+ return 0;
+ name += length;
+ }
+ for (p = &aix_std_libs[0]; *p != NULL; ++p)
+ if (strcmp (name, *p) == 0)
+ return 1;
return 0;
}
#endif /* COLLECT_EXPORT_LIST */
#endif
/* COFF version to scan the name list of the loaded program for
- the symbols g++ uses for static constructors and destructors.
-
- The constructor table begins at __CTOR_LIST__ and contains a count
- of the number of pointers (or -1 if the constructors are built in a
- separate section by the linker), followed by the pointers to the
- constructor functions, terminated with a null pointer. The
- destructor table has the same format, and begins at __DTOR_LIST__. */
+ the symbols g++ uses for static constructors and destructors. */
static void
-scan_prog_file (const char *prog_name, enum pass which_pass)
+scan_prog_file (const char *prog_name, scanpass which_pass,
+ scanfilter filter)
{
LDFILE *ldptr = NULL;
int sym_index, sym_count;
switch (is_ctor_dtor (name))
{
case SYM_CTOR:
+ if (! (filter & SCAN_CTOR))
+ break;
if (! is_shared)
add_to_list (&constructors, name);
#if defined (COLLECT_EXPORT_LIST) && !defined (LD_INIT_SWITCH)
break;
case SYM_DTOR:
+ if (! (filter & SCAN_DTOR))
+ break;
if (! is_shared)
add_to_list (&destructors, name);
#if defined (COLLECT_EXPORT_LIST) && !defined (LD_INIT_SWITCH)
#ifdef COLLECT_EXPORT_LIST
case SYM_INIT:
+ if (! (filter & SCAN_INIT))
+ break;
#ifndef LD_INIT_SWITCH
if (is_shared)
add_to_list (&constructors, name);
break;
case SYM_FINI:
+ if (! (filter & SCAN_FINI))
+ break;
#ifndef LD_INIT_SWITCH
if (is_shared)
add_to_list (&destructors, name);
#endif
case SYM_DWEH:
+ if (! (filter & SCAN_DWEH))
+ break;
if (! is_shared)
add_to_list (&frame_tables, name);
#if defined (COLLECT_EXPORT_LIST) && !defined (LD_INIT_SWITCH)
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