1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
30 #include "langhooks.h"
31 #include "diagnostic.h"
33 #include "cppdefault.h"
35 #include "debug.h" /* For debug_hooks. */
40 #include "tm.h" /* For BYTES_BIG_ENDIAN,
41 DOLLARS_IN_IDENTIFIERS,
42 STDC_0_IN_SYSTEM_HEADERS,
43 TARGET_FLT_EVAL_METHOD_NON_DEFAULT and
45 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
47 #ifndef DOLLARS_IN_IDENTIFIERS
48 # define DOLLARS_IN_IDENTIFIERS true
51 #ifndef TARGET_SYSTEM_ROOT
52 # define TARGET_SYSTEM_ROOT NULL
56 #define TARGET_OPTF(ARG)
60 cpp_options *cpp_opts;
63 static const char *this_input_filename;
65 /* Filename and stream for preprocessed output. */
66 static const char *out_fname;
67 static FILE *out_stream;
69 /* Append dependencies to deps_file. */
70 static bool deps_append;
72 /* If dependency switches (-MF etc.) have been given. */
73 static bool deps_seen;
78 /* Dependency output file. */
79 static const char *deps_file;
81 /* The prefix given by -iprefix, if any. */
82 static const char *iprefix;
84 /* The multilib directory given by -imultilib, if any. */
85 static const char *imultilib;
87 /* The system root, if any. Overridden by -isysroot. */
88 static const char *sysroot = TARGET_SYSTEM_ROOT;
90 /* Zero disables all standard directories for headers. */
91 static bool std_inc = true;
93 /* Zero disables the C++-specific standard directories for headers. */
94 static bool std_cxx_inc = true;
96 /* If the quote chain has been split by -I-. */
97 static bool quote_chain_split;
99 /* If -Wunused-macros. */
100 static bool warn_unused_macros;
102 /* If -Wvariadic-macros. */
103 static bool warn_variadic_macros = true;
105 /* Number of deferred options. */
106 static size_t deferred_count;
108 /* Number of deferred options scanned for -include. */
109 static size_t include_cursor;
111 static void handle_OPT_d (const char *);
112 static void set_std_cxx98 (int);
113 static void set_std_cxx0x (int);
114 static void set_std_c89 (int, int);
115 static void set_std_c99 (int);
116 static void set_std_c1x (int);
117 static void check_deps_environment_vars (void);
118 static void handle_deferred_opts (void);
119 static void sanitize_cpp_opts (void);
120 static void add_prefixed_path (const char *, size_t);
121 static void push_command_line_include (void);
122 static void cb_file_change (cpp_reader *, const struct line_map *);
123 static void cb_dir_change (cpp_reader *, const char *);
124 static void c_finish_options (void);
126 #ifndef STDC_0_IN_SYSTEM_HEADERS
127 #define STDC_0_IN_SYSTEM_HEADERS 0
130 /* Holds switches parsed by c_common_handle_option (), but whose
131 handling is deferred to c_common_post_options (). */
132 static void defer_opt (enum opt_code, const char *);
133 static struct deferred_opt
140 extern const unsigned int
141 c_family_lang_mask = (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX);
143 /* Defer option CODE with argument ARG. */
145 defer_opt (enum opt_code code, const char *arg)
147 deferred_opts[deferred_count].code = code;
148 deferred_opts[deferred_count].arg = arg;
152 /* Return language mask for option parsing. */
154 c_common_option_lang_mask (void)
156 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
158 return lang_flags[c_language];
161 /* Common diagnostics initialization. */
163 c_common_initialize_diagnostics (diagnostic_context *context)
165 /* This is conditionalized only because that is the way the front
166 ends used to do it. Maybe this should be unconditional? */
167 if (c_dialect_cxx ())
169 /* By default wrap lines at 80 characters. Is getenv
170 ("COLUMNS") preferable? */
171 diagnostic_line_cutoff (context) = 80;
172 /* By default, emit location information once for every
173 diagnostic message. */
174 diagnostic_prefixing_rule (context) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
177 context->opt_permissive = OPT_fpermissive;
180 /* Whether options from all C-family languages should be accepted
182 static bool accept_all_c_family_options = false;
184 /* Return whether to complain about a wrong-language option. */
186 c_common_complain_wrong_lang_p (const struct cl_option *option)
188 if (accept_all_c_family_options
189 && (option->flags & c_family_lang_mask))
195 /* Initialize options structure OPTS. */
197 c_common_init_options_struct (struct gcc_options *opts)
199 opts->x_flag_exceptions = c_dialect_cxx ();
200 opts->x_warn_pointer_arith = c_dialect_cxx ();
201 opts->x_warn_write_strings = c_dialect_cxx ();
202 opts->x_flag_warn_unused_result = true;
204 /* By default, C99-like requirements for complex multiply and divide. */
205 opts->x_flag_complex_method = 2;
208 /* Common initialization before calling option handlers. */
210 c_common_init_options (unsigned int decoded_options_count,
211 struct cl_decoded_option *decoded_options)
214 struct cpp_callbacks *cb;
216 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
217 ident_hash, line_table);
218 cb = cpp_get_callbacks (parse_in);
219 cb->error = c_cpp_error;
221 cpp_opts = cpp_get_options (parse_in);
222 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
223 cpp_opts->objc = c_dialect_objc ();
225 /* Reset to avoid warnings on internal definitions. We set it just
226 before passing on command-line options to cpplib. */
227 cpp_opts->warn_dollars = 0;
229 deferred_opts = XNEWVEC (struct deferred_opt, decoded_options_count);
231 if (c_language == clk_c)
233 /* If preprocessing assembly language, accept any of the C-family
234 front end options since the driver may pass them through. */
235 for (i = 1; i < decoded_options_count; i++)
236 if (decoded_options[i].opt_index == OPT_lang_asm)
238 accept_all_c_family_options = true;
244 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
245 form of an -f or -W option was given. Returns false if the switch was
246 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
248 c_common_handle_option (size_t scode, const char *arg, int value,
249 int kind, location_t loc,
250 const struct cl_option_handlers *handlers)
252 const struct cl_option *option = &cl_options[scode];
253 enum opt_code code = (enum opt_code) scode;
256 /* Prevent resetting the language standard to a C dialect when the driver
257 has already determined that we're looking at assembler input. */
258 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
263 if (cl_options[code].flags & c_family_lang_mask)
265 if ((option->flags & CL_TARGET)
266 && ! targetcm.handle_c_option (scode, arg, value))
273 case OPT__output_pch_:
278 defer_opt (code, arg);
282 cpp_opts->discard_comments = 0;
286 cpp_opts->discard_comments = 0;
287 cpp_opts->discard_comments_in_macro_exp = 0;
291 defer_opt (code, arg);
295 cpp_opts->print_include_names = 1;
299 TARGET_OPTF (xstrdup (arg));
303 if (strcmp (arg, "-"))
304 add_path (xstrdup (arg), BRACKET, 0, true);
307 if (quote_chain_split)
308 error ("-I- specified twice");
309 quote_chain_split = true;
310 split_quote_chain ();
311 inform (input_location, "obsolete option -I- used, please use -iquote instead");
317 /* When doing dependencies with -M or -MM, suppress normal
318 preprocessed output, but still do -dM etc. as software
319 depends on this. Preprocessed output does occur if -MD, -MMD
320 or environment var dependency generation is used. */
321 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
327 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
328 cpp_opts->deps.need_preprocessor_output = true;
339 cpp_opts->deps.missing_files = true;
344 cpp_opts->deps.phony_targets = true;
350 defer_opt (code, arg);
354 flag_no_line_commands = 1;
358 defer_opt (code, arg);
364 handle_generated_option (&global_options, &global_options_set,
365 OPT_Wimplicit, NULL, value,
366 c_family_lang_mask, kind, loc,
367 handlers, global_dc);
368 warn_char_subscripts = value;
369 warn_missing_braces = value;
370 warn_parentheses = value;
371 warn_return_type = value;
372 warn_sequence_point = value; /* Was C only. */
374 if (warn_strict_aliasing == -1)
375 set_Wstrict_aliasing (&global_options, value);
376 warn_address = value;
377 if (warn_strict_overflow == -1)
378 warn_strict_overflow = value;
379 warn_array_bounds = value;
380 warn_volatile_register_var = value;
382 /* Only warn about unknown pragmas that are not in system
384 warn_unknown_pragmas = value;
386 warn_uninitialized = value;
388 if (!c_dialect_cxx ())
390 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
391 can turn it off only if it's not explicit. */
393 warn_main = (value ? 2 : 0);
395 /* In C, -Wall turns on -Wenum-compare, which we do here.
396 In C++ it is on by default, which is done in
397 c_common_post_options. */
398 if (warn_enum_compare == -1)
399 warn_enum_compare = value;
403 /* C++-specific warnings. */
404 warn_sign_compare = value;
405 warn_reorder = value;
406 warn_cxx0x_compat = value;
409 cpp_opts->warn_trigraphs = value;
410 cpp_opts->warn_comments = value;
411 cpp_opts->warn_num_sign_change = value;
413 if (warn_pointer_sign == -1)
414 warn_pointer_sign = value;
417 case OPT_Wbuiltin_macro_redefined:
418 cpp_opts->warn_builtin_macro_redefined = value;
422 cpp_opts->warn_comments = value;
425 case OPT_Wc___compat:
426 /* Because -Wenum-compare is the default in C++, -Wc++-compat
427 implies -Wenum-compare. */
428 if (warn_enum_compare == -1 && value)
429 warn_enum_compare = value;
430 /* Because C++ always warns about a goto which misses an
431 initialization, -Wc++-compat turns on -Wjump-misses-init. */
432 if (warn_jump_misses_init == -1 && value)
433 warn_jump_misses_init = value;
434 cpp_opts->warn_cxx_operator_names = value;
437 case OPT_Wdeprecated:
438 cpp_opts->cpp_warn_deprecated = value;
441 case OPT_Wendif_labels:
442 cpp_opts->warn_endif_labels = value;
446 global_dc->warning_as_error_requested = value;
454 set_Wformat (atoi (arg));
458 gcc_assert (value == 0 || value == 1);
459 if (warn_implicit_int == -1)
460 handle_generated_option (&global_options, &global_options_set,
461 OPT_Wimplicit_int, NULL, value,
462 c_family_lang_mask, kind, loc, handlers,
464 if (warn_implicit_function_declaration == -1)
465 handle_generated_option (&global_options, &global_options_set,
466 OPT_Wimplicit_function_declaration, NULL,
467 value, c_family_lang_mask, kind, loc,
468 handlers, global_dc);
471 case OPT_Winvalid_pch:
472 cpp_opts->warn_invalid_pch = value;
476 cpp_opts->cpp_warn_long_long = value;
479 case OPT_Wmissing_include_dirs:
480 cpp_opts->warn_missing_include_dirs = value;
484 cpp_opts->warn_multichar = value;
487 case OPT_Wnormalized_:
488 if (kind == DK_ERROR)
491 inform (input_location, "-Werror=normalized=: set -Wnormalized=nfc");
492 cpp_opts->warn_normalize = normalized_C;
496 if (!value || (arg && strcasecmp (arg, "none") == 0))
497 cpp_opts->warn_normalize = normalized_none;
498 else if (!arg || strcasecmp (arg, "nfkc") == 0)
499 cpp_opts->warn_normalize = normalized_KC;
500 else if (strcasecmp (arg, "id") == 0)
501 cpp_opts->warn_normalize = normalized_identifier_C;
502 else if (strcasecmp (arg, "nfc") == 0)
503 cpp_opts->warn_normalize = normalized_C;
505 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
509 case OPT_Wreturn_type:
510 warn_return_type = value;
513 case OPT_Wtraditional:
514 cpp_opts->cpp_warn_traditional = value;
518 cpp_opts->warn_trigraphs = value;
522 cpp_opts->warn_undef = value;
525 case OPT_Wunknown_pragmas:
526 /* Set to greater than 1, so that even unknown pragmas in
527 system headers will be warned about. */
528 warn_unknown_pragmas = value * 2;
531 case OPT_Wunused_macros:
532 warn_unused_macros = value;
535 case OPT_Wvariadic_macros:
536 warn_variadic_macros = value;
539 case OPT_Wwrite_strings:
540 warn_write_strings = value;
546 warn_nonvdtor = true;
550 if (!c_dialect_cxx ())
551 set_std_c89 (false, true);
553 set_std_cxx98 (true);
560 case OPT_fcond_mismatch:
561 if (!c_dialect_cxx ())
563 flag_cond_mismatch = value;
566 warning (0, "switch %qs is no longer supported", option->opt_text);
573 disable_builtin_function (arg);
576 case OPT_fdirectives_only:
577 cpp_opts->directives_only = value;
580 case OPT_fdollars_in_identifiers:
581 cpp_opts->dollars_in_ident = value;
584 case OPT_ffreestanding:
586 /* Fall through.... */
589 flag_no_builtin = !value;
592 case OPT_fconstant_string_class_:
593 constant_string_class_name = arg;
596 case OPT_fextended_identifiers:
597 cpp_opts->extended_identifiers = value;
600 case OPT_fgnu_runtime:
601 flag_next_runtime = !value;
604 case OPT_fnext_runtime:
605 flag_next_runtime = value;
608 case OPT_foperator_names:
609 cpp_opts->operator_names = value;
613 cpp_opts->restore_pch_deps = value;
616 case OPT_fpch_preprocess:
617 flag_pch_preprocess = value;
620 case OPT_fpermissive:
621 flag_permissive = value;
622 global_dc->permissive = value;
625 case OPT_fpreprocessed:
626 cpp_opts->preprocessed = value;
630 flag_use_repository = value;
632 flag_implicit_templates = 0;
636 /* It is documented that we silently ignore silly values. */
637 if (value >= 1 && value <= 100)
638 cpp_opts->tabstop = value;
641 case OPT_fexec_charset_:
642 cpp_opts->narrow_charset = arg;
645 case OPT_fwide_exec_charset_:
646 cpp_opts->wide_charset = arg;
649 case OPT_finput_charset_:
650 cpp_opts->input_charset = arg;
653 case OPT_ftemplate_depth_:
654 max_tinst_depth = value;
657 case OPT_fvisibility_inlines_hidden:
658 visibility_options.inlines_hidden = value;
661 case OPT_femit_struct_debug_baseonly:
662 set_struct_debug_option (&global_options, loc, "base");
665 case OPT_femit_struct_debug_reduced:
666 set_struct_debug_option (&global_options, loc,
667 "dir:ord:sys,dir:gen:any,ind:base");
670 case OPT_femit_struct_debug_detailed_:
671 set_struct_debug_option (&global_options, loc, arg);
675 add_path (xstrdup (arg), AFTER, 0, true);
680 defer_opt (code, arg);
692 add_path (xstrdup (arg), QUOTE, 0, true);
700 add_path (xstrdup (arg), SYSTEM, 0, true);
703 case OPT_iwithprefix:
704 add_prefixed_path (arg, SYSTEM);
707 case OPT_iwithprefixbefore:
708 add_prefixed_path (arg, BRACKET);
712 cpp_set_lang (parse_in, CLK_ASM);
713 cpp_opts->dollars_in_ident = false;
728 error ("output filename specified twice");
731 /* We need to handle the -pedantic switches here, rather than in
732 c_common_post_options, so that a subsequent -Wno-endif-labels
733 is not overridden. */
734 case OPT_pedantic_errors:
736 cpp_opts->cpp_pedantic = 1;
737 cpp_opts->warn_endif_labels = 1;
738 if (warn_pointer_sign == -1)
739 warn_pointer_sign = 1;
740 if (warn_overlength_strings == -1)
741 warn_overlength_strings = 1;
746 case OPT_print_objc_runtime_info:
747 print_struct_values = 1;
755 case OPT_std_gnu__98:
756 if (!preprocessing_asm_p)
757 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
761 case OPT_std_gnu__0x:
762 if (!preprocessing_asm_p)
763 set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
767 case OPT_std_iso9899_199409:
768 if (!preprocessing_asm_p)
769 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
773 if (!preprocessing_asm_p)
774 set_std_c89 (false /* c94 */, false /* ISO */);
778 if (!preprocessing_asm_p)
779 set_std_c99 (true /* ISO */);
783 if (!preprocessing_asm_p)
784 set_std_c99 (false /* ISO */);
788 if (!preprocessing_asm_p)
789 set_std_c1x (true /* ISO */);
793 if (!preprocessing_asm_p)
794 set_std_c1x (false /* ISO */);
798 cpp_opts->trigraphs = 1;
801 case OPT_traditional_cpp:
802 cpp_opts->traditional = 1;
817 /* Default implementation of TARGET_HANDLE_C_OPTION. */
820 default_handle_c_option (size_t code ATTRIBUTE_UNUSED,
821 const char *arg ATTRIBUTE_UNUSED,
822 int value ATTRIBUTE_UNUSED)
827 /* Post-switch processing. */
829 c_common_post_options (const char **pfilename)
831 struct cpp_callbacks *cb;
833 /* Canonicalize the input and output filenames. */
834 if (in_fnames == NULL)
836 in_fnames = XNEWVEC (const char *, 1);
839 else if (strcmp (in_fnames[0], "-") == 0)
842 if (out_fname == NULL || !strcmp (out_fname, "-"))
845 if (cpp_opts->deps.style == DEPS_NONE)
846 check_deps_environment_vars ();
848 handle_deferred_opts ();
850 sanitize_cpp_opts ();
852 register_include_chains (parse_in, sysroot, iprefix, imultilib,
853 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
855 #ifdef C_COMMON_OVERRIDE_OPTIONS
856 /* Some machines may reject certain combinations of C
857 language-specific options. */
858 C_COMMON_OVERRIDE_OPTIONS;
861 /* Excess precision other than "fast" requires front-end
863 if (c_dialect_cxx ())
865 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
866 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
867 sorry ("-fexcess-precision=standard for C++");
868 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
870 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
871 flag_excess_precision_cmdline = (flag_iso
872 ? EXCESS_PRECISION_STANDARD
873 : EXCESS_PRECISION_FAST);
875 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
876 inline semantics are not supported in GNU89 or C89 mode. */
877 if (flag_gnu89_inline == -1)
878 flag_gnu89_inline = !flag_isoc99;
879 else if (!flag_gnu89_inline && !flag_isoc99)
880 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
882 /* Default to ObjC sjlj exception handling if NeXT runtime. */
883 if (flag_objc_sjlj_exceptions < 0)
884 flag_objc_sjlj_exceptions = flag_next_runtime;
885 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
888 /* -Wextra implies the following flags
889 unless explicitly overridden. */
890 if (warn_type_limits == -1)
891 warn_type_limits = extra_warnings;
892 if (warn_clobbered == -1)
893 warn_clobbered = extra_warnings;
894 if (warn_empty_body == -1)
895 warn_empty_body = extra_warnings;
896 if (warn_sign_compare == -1)
897 warn_sign_compare = extra_warnings;
898 if (warn_missing_field_initializers == -1)
899 warn_missing_field_initializers = extra_warnings;
900 if (warn_missing_parameter_type == -1)
901 warn_missing_parameter_type = extra_warnings;
902 if (warn_old_style_declaration == -1)
903 warn_old_style_declaration = extra_warnings;
904 if (warn_override_init == -1)
905 warn_override_init = extra_warnings;
906 if (warn_ignored_qualifiers == -1)
907 warn_ignored_qualifiers = extra_warnings;
909 /* -Wpointer-sign is disabled by default, but it is enabled if any
910 of -Wall or -pedantic are given. */
911 if (warn_pointer_sign == -1)
912 warn_pointer_sign = 0;
914 if (warn_strict_aliasing == -1)
915 warn_strict_aliasing = 0;
916 if (warn_strict_overflow == -1)
917 warn_strict_overflow = 0;
918 if (warn_jump_misses_init == -1)
919 warn_jump_misses_init = 0;
921 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
922 It is never enabled in C++, as the minimum limit is not normative
924 if (warn_overlength_strings == -1 || c_dialect_cxx ())
925 warn_overlength_strings = 0;
927 /* Wmain is enabled by default in C++ but not in C. */
928 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
929 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
930 if set by -Wmain). */
932 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
933 else if (warn_main == 2)
934 warn_main = flag_hosted ? 1 : 0;
936 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
937 through -Wno-sign-conversion). While in C++,
938 -Wsign-conversion needs to be requested explicitly. */
939 if (warn_sign_conversion == -1)
940 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
942 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
943 in c_common_handle_option; if it has not yet been set, it is
944 disabled by default. In C++, it is enabled by default. */
945 if (warn_enum_compare == -1)
946 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
948 /* -Wpacked-bitfield-compat is on by default for the C languages. The
949 warning is issued in stor-layout.c which is not part of the front-end so
950 we need to selectively turn it on here. */
951 if (warn_packed_bitfield_compat == -1)
952 warn_packed_bitfield_compat = 1;
954 /* Special format checking options don't work without -Wformat; warn if
958 warning (OPT_Wformat_y2k,
959 "-Wformat-y2k ignored without -Wformat");
960 warning (OPT_Wformat_extra_args,
961 "-Wformat-extra-args ignored without -Wformat");
962 warning (OPT_Wformat_zero_length,
963 "-Wformat-zero-length ignored without -Wformat");
964 warning (OPT_Wformat_nonliteral,
965 "-Wformat-nonliteral ignored without -Wformat");
966 warning (OPT_Wformat_contains_nul,
967 "-Wformat-contains-nul ignored without -Wformat");
968 warning (OPT_Wformat_security,
969 "-Wformat-security ignored without -Wformat");
972 if (warn_implicit == -1)
975 if (warn_implicit_int == -1)
976 warn_implicit_int = 0;
978 /* -Wimplicit-function-declaration is enabled by default for C99. */
979 if (warn_implicit_function_declaration == -1)
980 warn_implicit_function_declaration = flag_isoc99;
982 /* If we're allowing C++0x constructs, don't warn about C++0x
983 compatibility problems. */
984 if (cxx_dialect == cxx0x)
985 warn_cxx0x_compat = 0;
987 if (flag_preprocess_only)
989 /* Open the output now. We must do so even if flag_no_output is
990 on, because there may be other output than from the actual
991 preprocessing (e.g. from -dM). */
992 if (out_fname[0] == '\0')
995 out_stream = fopen (out_fname, "w");
997 if (out_stream == NULL)
999 fatal_error ("opening output file %s: %m", out_fname);
1003 if (num_in_fnames > 1)
1004 error ("too many filenames given. Type %s --help for usage",
1007 init_pp_output (out_stream);
1013 /* When writing a PCH file, avoid reading some other PCH file,
1014 because the default address space slot then can't be used
1015 for the output PCH file. */
1017 c_common_no_more_pch ();
1019 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1020 input_location = UNKNOWN_LOCATION;
1023 cb = cpp_get_callbacks (parse_in);
1024 cb->file_change = cb_file_change;
1025 cb->dir_change = cb_dir_change;
1026 cpp_post_options (parse_in);
1028 input_location = UNKNOWN_LOCATION;
1030 *pfilename = this_input_filename
1031 = cpp_read_main_file (parse_in, in_fnames[0]);
1032 /* Don't do any compilation or preprocessing if there is no input file. */
1033 if (this_input_filename == NULL)
1039 if (flag_working_directory
1040 && flag_preprocess_only && !flag_no_line_commands)
1041 pp_dir_change (parse_in, get_src_pwd ());
1043 return flag_preprocess_only;
1046 /* Front end initialization common to C, ObjC and C++. */
1048 c_common_init (void)
1050 /* Set up preprocessor arithmetic. Must be done after call to
1051 c_common_nodes_and_builtins for type nodes to be good. */
1052 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1053 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1054 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1055 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1056 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1057 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1059 /* This can't happen until after wchar_precision and bytes_big_endian
1061 cpp_init_iconv (parse_in);
1064 c_common_print_pch_checksum (stderr);
1066 /* Has to wait until now so that cpplib has its hash table. */
1069 if (flag_preprocess_only)
1071 c_finish_options ();
1072 preprocess_file (parse_in);
1079 /* Initialize the integrated preprocessor after debug output has been
1080 initialized; loop over each input file. */
1082 c_common_parse_file (void)
1089 c_finish_options ();
1094 /* And end the main input file, if the debug writer wants it */
1095 if (debug_hooks->start_end_main_source_file)
1096 (*debug_hooks->end_source_file) (0);
1097 if (++i >= num_in_fnames)
1099 cpp_undef_all (parse_in);
1100 cpp_clear_file_cache (parse_in);
1102 = cpp_read_main_file (parse_in, in_fnames[i]);
1103 /* If an input file is missing, abandon further compilation.
1104 cpplib has issued a diagnostic. */
1105 if (!this_input_filename)
1110 /* Common finish hook for the C, ObjC and C++ front ends. */
1112 c_common_finish (void)
1114 FILE *deps_stream = NULL;
1116 /* Don't write the deps file if there are errors. */
1117 if (cpp_opts->deps.style != DEPS_NONE && !seen_error ())
1119 /* If -M or -MM was seen without -MF, default output to the
1122 deps_stream = out_stream;
1125 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1127 fatal_error ("opening dependency file %s: %m", deps_file);
1131 /* For performance, avoid tearing down cpplib's internal structures
1132 with cpp_destroy (). */
1133 cpp_finish (parse_in, deps_stream);
1135 if (deps_stream && deps_stream != out_stream
1136 && (ferror (deps_stream) || fclose (deps_stream)))
1137 fatal_error ("closing dependency file %s: %m", deps_file);
1139 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1140 fatal_error ("when writing output to %s: %m", out_fname);
1143 /* Either of two environment variables can specify output of
1144 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1145 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1146 and DEPS_TARGET is the target to mention in the deps. They also
1147 result in dependency information being appended to the output file
1148 rather than overwriting it, and like Sun's compiler
1149 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1151 check_deps_environment_vars (void)
1155 spec = getenv ("DEPENDENCIES_OUTPUT");
1157 cpp_opts->deps.style = DEPS_USER;
1160 spec = getenv ("SUNPRO_DEPENDENCIES");
1163 cpp_opts->deps.style = DEPS_SYSTEM;
1164 cpp_opts->deps.ignore_main_file = true;
1170 /* Find the space before the DEPS_TARGET, if there is one. */
1171 char *s = strchr (spec, ' ');
1174 /* Let the caller perform MAKE quoting. */
1175 defer_opt (OPT_MT, s + 1);
1179 /* Command line -MF overrides environment variables and default. */
1188 /* Handle deferred command line switches. */
1190 handle_deferred_opts (void)
1195 /* Avoid allocating the deps buffer if we don't need it.
1196 (This flag may be true without there having been -MT or -MQ
1197 options, but we'll still need the deps buffer.) */
1201 deps = cpp_get_deps (parse_in);
1203 for (i = 0; i < deferred_count; i++)
1205 struct deferred_opt *opt = &deferred_opts[i];
1207 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1208 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1212 /* These settings are appropriate for GCC, but not necessarily so for
1213 cpplib as a library. */
1215 sanitize_cpp_opts (void)
1217 /* If we don't know what style of dependencies to output, complain
1218 if any other dependency switches have been given. */
1219 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1220 error ("to generate dependencies you must specify either -M or -MM");
1222 /* -dM and dependencies suppress normal output; do it here so that
1223 the last -d[MDN] switch overrides earlier ones. */
1224 if (flag_dump_macros == 'M')
1227 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1228 to perform proper macro expansion. */
1229 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1230 flag_dump_macros = 'D';
1232 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1233 -dM since at least glibc relies on -M -dM to work. */
1234 /* Also, flag_no_output implies flag_no_line_commands, always. */
1237 if (flag_dump_macros != 'M')
1238 flag_dump_macros = 0;
1239 flag_dump_includes = 0;
1240 flag_no_line_commands = 1;
1242 else if (cpp_opts->deps.missing_files)
1243 error ("-MG may only be used with -M or -MM");
1245 cpp_opts->unsigned_char = !flag_signed_char;
1246 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1248 /* Wlong-long is disabled by default. It is enabled by:
1249 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1250 [-pedantic | -Wtraditional] -std=non-c99 .
1252 Either -Wlong-long or -Wno-long-long override any other settings. */
1253 if (warn_long_long == -1)
1254 warn_long_long = ((pedantic || warn_traditional)
1255 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1256 cpp_opts->cpp_warn_long_long = warn_long_long;
1258 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1259 this also turns off warnings about GCCs extension. */
1260 cpp_opts->warn_variadic_macros
1261 = warn_variadic_macros && (pedantic || warn_traditional);
1263 /* If we're generating preprocessor output, emit current directory
1264 if explicitly requested or if debugging information is enabled.
1265 ??? Maybe we should only do it for debugging formats that
1266 actually output the current directory? */
1267 if (flag_working_directory == -1)
1268 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1270 if (cpp_opts->directives_only)
1272 if (warn_unused_macros)
1273 error ("-fdirectives-only is incompatible with -Wunused_macros");
1274 if (cpp_opts->traditional)
1275 error ("-fdirectives-only is incompatible with -traditional");
1279 /* Add include path with a prefix at the front of its name. */
1281 add_prefixed_path (const char *suffix, size_t chain)
1285 size_t prefix_len, suffix_len;
1287 suffix_len = strlen (suffix);
1288 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1289 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1291 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1292 memcpy (path, prefix, prefix_len);
1293 memcpy (path + prefix_len, suffix, suffix_len);
1294 path[prefix_len + suffix_len] = '\0';
1296 add_path (path, chain, 0, false);
1299 /* Handle -D, -U, -A, -imacros, and the first -include. */
1301 c_finish_options (void)
1303 if (!cpp_opts->preprocessed)
1307 cb_file_change (parse_in,
1308 linemap_add (line_table, LC_RENAME, 0,
1309 _("<built-in>"), 0));
1311 cpp_init_builtins (parse_in, flag_hosted);
1312 c_cpp_builtins (parse_in);
1314 /* We're about to send user input to cpplib, so make it warn for
1315 things that we previously (when we sent it internal definitions)
1316 told it to not warn.
1318 C99 permits implementation-defined characters in identifiers.
1319 The documented meaning of -std= is to turn off extensions that
1320 conflict with the specified standard, and since a strictly
1321 conforming program cannot contain a '$', we do not condition
1322 their acceptance on the -std= setting. */
1323 cpp_opts->warn_dollars = (cpp_opts->cpp_pedantic && !cpp_opts->c99);
1325 cb_file_change (parse_in,
1326 linemap_add (line_table, LC_RENAME, 0,
1327 _("<command-line>"), 0));
1329 for (i = 0; i < deferred_count; i++)
1331 struct deferred_opt *opt = &deferred_opts[i];
1333 if (opt->code == OPT_D)
1334 cpp_define (parse_in, opt->arg);
1335 else if (opt->code == OPT_U)
1336 cpp_undef (parse_in, opt->arg);
1337 else if (opt->code == OPT_A)
1339 if (opt->arg[0] == '-')
1340 cpp_unassert (parse_in, opt->arg + 1);
1342 cpp_assert (parse_in, opt->arg);
1346 /* Start the main input file, if the debug writer wants it. */
1347 if (debug_hooks->start_end_main_source_file
1348 && !flag_preprocess_only)
1349 (*debug_hooks->start_source_file) (0, this_input_filename);
1351 /* Handle -imacros after -D and -U. */
1352 for (i = 0; i < deferred_count; i++)
1354 struct deferred_opt *opt = &deferred_opts[i];
1356 if (opt->code == OPT_imacros
1357 && cpp_push_include (parse_in, opt->arg))
1359 /* Disable push_command_line_include callback for now. */
1360 include_cursor = deferred_count + 1;
1361 cpp_scan_nooutput (parse_in);
1367 if (cpp_opts->directives_only)
1368 cpp_init_special_builtins (parse_in);
1370 /* Start the main input file, if the debug writer wants it. */
1371 if (debug_hooks->start_end_main_source_file
1372 && !flag_preprocess_only)
1373 (*debug_hooks->start_source_file) (0, this_input_filename);
1377 push_command_line_include ();
1380 /* Give CPP the next file given by -include, if any. */
1382 push_command_line_include (void)
1384 while (include_cursor < deferred_count)
1386 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1388 if (!cpp_opts->preprocessed && opt->code == OPT_include
1389 && cpp_push_include (parse_in, opt->arg))
1393 if (include_cursor == deferred_count)
1396 /* -Wunused-macros should only warn about macros defined hereafter. */
1397 cpp_opts->warn_unused_macros = warn_unused_macros;
1398 /* Restore the line map from <command line>. */
1399 if (!cpp_opts->preprocessed)
1400 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1402 /* Set this here so the client can change the option if it wishes,
1403 and after stacking the main file so we don't trace the main file. */
1404 line_table->trace_includes = cpp_opts->print_include_names;
1408 /* File change callback. Has to handle -include files. */
1410 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1411 const struct line_map *new_map)
1413 if (flag_preprocess_only)
1414 pp_file_change (new_map);
1416 fe_file_change (new_map);
1418 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1419 push_command_line_include ();
1423 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1425 if (!set_src_pwd (dir))
1426 warning (0, "too late for # directive to set debug directory");
1429 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1430 extensions if ISO). There is no concept of gnu94. */
1432 set_std_c89 (int c94, int iso)
1434 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1437 flag_no_gnu_keywords = iso;
1438 flag_no_nonansi_builtin = iso;
1444 /* Set the C 99 standard (without GNU extensions if ISO). */
1446 set_std_c99 (int iso)
1448 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1450 flag_no_nonansi_builtin = iso;
1457 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1459 set_std_c1x (int iso)
1461 cpp_set_lang (parse_in, iso ? CLK_STDC1X: CLK_GNUC1X);
1463 flag_no_nonansi_builtin = iso;
1470 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1472 set_std_cxx98 (int iso)
1474 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1475 flag_no_gnu_keywords = iso;
1476 flag_no_nonansi_builtin = iso;
1478 cxx_dialect = cxx98;
1481 /* Set the C++ 0x working draft "standard" (without GNU extensions if ISO). */
1483 set_std_cxx0x (int iso)
1485 cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
1486 flag_no_gnu_keywords = iso;
1487 flag_no_nonansi_builtin = iso;
1489 cxx_dialect = cxx0x;
1492 /* Args to -d specify what to dump. Silently ignore
1493 unrecognized options; they may be aimed at toplev.c. */
1495 handle_OPT_d (const char *arg)
1499 while ((c = *arg++) != '\0')
1502 case 'M': /* Dump macros only. */
1503 case 'N': /* Dump names. */
1504 case 'D': /* Dump definitions. */
1505 case 'U': /* Dump used macros. */
1506 flag_dump_macros = c;
1510 flag_dump_includes = 1;