1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2014 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
29 #include "langhooks.h"
30 #include "diagnostic.h"
31 #include "tree-diagnostic.h" /* for virt_loc_aware_diagnostic_finalizer */
33 #include "cppdefault.h"
35 #include "debug.h" /* For debug_hooks. */
38 #include "plugin.h" /* For PLUGIN_INCLUDE_FILE event. */
41 #include "tm.h" /* For BYTES_BIG_ENDIAN,
42 DOLLARS_IN_IDENTIFIERS,
43 STDC_0_IN_SYSTEM_HEADERS,
44 TARGET_FLT_EVAL_METHOD_NON_DEFAULT and
46 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
49 #ifndef DOLLARS_IN_IDENTIFIERS
50 # define DOLLARS_IN_IDENTIFIERS true
53 #ifndef TARGET_SYSTEM_ROOT
54 # define TARGET_SYSTEM_ROOT NULL
58 #define TARGET_OPTF(ARG)
62 cpp_options *cpp_opts;
65 static const char *this_input_filename;
67 /* Filename and stream for preprocessed output. */
68 static const char *out_fname;
69 static FILE *out_stream;
71 /* Append dependencies to deps_file. */
72 static bool deps_append;
74 /* If dependency switches (-MF etc.) have been given. */
75 static bool deps_seen;
80 /* Dependency output file. */
81 static const char *deps_file;
83 /* The prefix given by -iprefix, if any. */
84 static const char *iprefix;
86 /* The multilib directory given by -imultilib, if any. */
87 static const char *imultilib;
89 /* The system root, if any. Overridden by -isysroot. */
90 static const char *sysroot = TARGET_SYSTEM_ROOT;
92 /* Zero disables all standard directories for headers. */
93 static bool std_inc = true;
95 /* Zero disables the C++-specific standard directories for headers. */
96 static bool std_cxx_inc = true;
98 /* If the quote chain has been split by -I-. */
99 static bool quote_chain_split;
101 /* Number of deferred options. */
102 static size_t deferred_count;
104 /* Number of deferred options scanned for -include. */
105 static size_t include_cursor;
107 /* Dump files/flags to use during parsing. */
108 static FILE *original_dump_file = NULL;
109 static int original_dump_flags;
110 static FILE *class_dump_file = NULL;
111 static int class_dump_flags;
113 /* Whether any standard preincluded header has been preincluded. */
114 static bool done_preinclude;
116 static void handle_OPT_d (const char *);
117 static void set_std_cxx98 (int);
118 static void set_std_cxx11 (int);
119 static void set_std_cxx14 (int);
120 static void set_std_cxx1z (int);
121 static void set_std_c89 (int, int);
122 static void set_std_c99 (int);
123 static void set_std_c11 (int);
124 static void check_deps_environment_vars (void);
125 static void handle_deferred_opts (void);
126 static void sanitize_cpp_opts (void);
127 static void add_prefixed_path (const char *, size_t);
128 static void push_command_line_include (void);
129 static void cb_file_change (cpp_reader *, const struct line_map *);
130 static void cb_dir_change (cpp_reader *, const char *);
131 static void c_finish_options (void);
133 #ifndef STDC_0_IN_SYSTEM_HEADERS
134 #define STDC_0_IN_SYSTEM_HEADERS 0
137 /* Holds switches parsed by c_common_handle_option (), but whose
138 handling is deferred to c_common_post_options (). */
139 static void defer_opt (enum opt_code, const char *);
140 static struct deferred_opt
147 extern const unsigned int
148 c_family_lang_mask = (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX);
150 /* Defer option CODE with argument ARG. */
152 defer_opt (enum opt_code code, const char *arg)
154 deferred_opts[deferred_count].code = code;
155 deferred_opts[deferred_count].arg = arg;
159 /* Return language mask for option parsing. */
161 c_common_option_lang_mask (void)
163 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
165 return lang_flags[c_language];
168 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
170 c_diagnostic_finalizer (diagnostic_context *context,
171 diagnostic_info *diagnostic)
173 diagnostic_show_locus (context, diagnostic);
174 /* By default print macro expansion contexts in the diagnostic
175 finalizer -- for tokens resulting from macro expansion. */
176 virt_loc_aware_diagnostic_finalizer (context, diagnostic);
177 pp_destroy_prefix (context->printer);
178 pp_newline_and_flush (context->printer);
181 /* Common diagnostics initialization. */
183 c_common_initialize_diagnostics (diagnostic_context *context)
185 /* This is conditionalized only because that is the way the front
186 ends used to do it. Maybe this should be unconditional? */
187 if (c_dialect_cxx ())
189 /* By default wrap lines at 80 characters. Is getenv
190 ("COLUMNS") preferable? */
191 diagnostic_line_cutoff (context) = 80;
192 /* By default, emit location information once for every
193 diagnostic message. */
194 diagnostic_prefixing_rule (context) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
196 diagnostic_finalizer (context) = c_diagnostic_finalizer;
197 context->opt_permissive = OPT_fpermissive;
200 /* Whether options from all C-family languages should be accepted
202 static bool accept_all_c_family_options = false;
204 /* Return whether to complain about a wrong-language option. */
206 c_common_complain_wrong_lang_p (const struct cl_option *option)
208 if (accept_all_c_family_options
209 && (option->flags & c_family_lang_mask))
215 /* Initialize options structure OPTS. */
217 c_common_init_options_struct (struct gcc_options *opts)
219 opts->x_flag_exceptions = c_dialect_cxx ();
220 opts->x_warn_pointer_arith = c_dialect_cxx ();
221 opts->x_warn_write_strings = c_dialect_cxx ();
222 opts->x_flag_warn_unused_result = true;
224 /* By default, C99-like requirements for complex multiply and divide. */
225 opts->x_flag_complex_method = 2;
228 /* Common initialization before calling option handlers. */
230 c_common_init_options (unsigned int decoded_options_count,
231 struct cl_decoded_option *decoded_options)
234 struct cpp_callbacks *cb;
236 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
237 ident_hash, line_table);
238 cb = cpp_get_callbacks (parse_in);
239 cb->error = c_cpp_error;
241 cpp_opts = cpp_get_options (parse_in);
242 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
243 cpp_opts->objc = c_dialect_objc ();
245 /* Reset to avoid warnings on internal definitions. We set it just
246 before passing on command-line options to cpplib. */
247 cpp_opts->warn_dollars = 0;
249 deferred_opts = XNEWVEC (struct deferred_opt, decoded_options_count);
251 if (c_language == clk_c)
253 /* If preprocessing assembly language, accept any of the C-family
254 front end options since the driver may pass them through. */
255 for (i = 1; i < decoded_options_count; i++)
256 if (decoded_options[i].opt_index == OPT_lang_asm)
258 accept_all_c_family_options = true;
264 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
265 form of an -f or -W option was given. Returns false if the switch was
266 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
268 c_common_handle_option (size_t scode, const char *arg, int value,
269 int kind, location_t loc,
270 const struct cl_option_handlers *handlers)
272 const struct cl_option *option = &cl_options[scode];
273 enum opt_code code = (enum opt_code) scode;
276 /* Prevent resetting the language standard to a C dialect when the driver
277 has already determined that we're looking at assembler input. */
278 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
283 if (cl_options[code].flags & c_family_lang_mask)
285 if ((option->flags & CL_TARGET)
286 && ! targetcm.handle_c_option (scode, arg, value))
293 case OPT__output_pch_:
298 defer_opt (code, arg);
302 cpp_opts->discard_comments = 0;
306 cpp_opts->discard_comments = 0;
307 cpp_opts->discard_comments_in_macro_exp = 0;
311 defer_opt (code, arg);
315 cpp_opts->print_include_names = 1;
319 TARGET_OPTF (xstrdup (arg));
323 if (strcmp (arg, "-"))
324 add_path (xstrdup (arg), BRACKET, 0, true);
327 if (quote_chain_split)
328 error ("-I- specified twice");
329 quote_chain_split = true;
330 split_quote_chain ();
331 inform (input_location, "obsolete option -I- used, please use -iquote instead");
337 /* When doing dependencies with -M or -MM, suppress normal
338 preprocessed output, but still do -dM etc. as software
339 depends on this. Preprocessed output does occur if -MD, -MMD
340 or environment var dependency generation is used. */
341 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
347 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
348 cpp_opts->deps.need_preprocessor_output = true;
359 cpp_opts->deps.missing_files = true;
364 cpp_opts->deps.phony_targets = true;
370 defer_opt (code, arg);
374 flag_no_line_commands = 1;
378 defer_opt (code, arg);
382 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
384 cpp_opts->warn_num_sign_change = value;
387 case OPT_Wc___compat:
388 cpp_opts->warn_cxx_operator_names = value;
392 cpp_opts->cpp_warn_long_long = value;
395 case OPT_Wnormalized_:
396 /* FIXME: Move all this to c.opt. */
397 if (kind == DK_ERROR)
400 inform (input_location, "-Werror=normalized=: set -Wnormalized=nfc");
401 cpp_opts->warn_normalize = normalized_C;
405 if (!value || (arg && strcasecmp (arg, "none") == 0))
406 cpp_opts->warn_normalize = normalized_none;
407 else if (!arg || strcasecmp (arg, "nfkc") == 0)
408 cpp_opts->warn_normalize = normalized_KC;
409 else if (strcasecmp (arg, "id") == 0)
410 cpp_opts->warn_normalize = normalized_identifier_C;
411 else if (strcasecmp (arg, "nfc") == 0)
412 cpp_opts->warn_normalize = normalized_C;
414 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
418 case OPT_Wtraditional:
419 cpp_opts->cpp_warn_traditional = value;
422 case OPT_Wunknown_pragmas:
423 /* Set to greater than 1, so that even unknown pragmas in
424 system headers will be warned about. */
425 /* ??? There is no way to handle this automatically for now. */
426 warn_unknown_pragmas = value * 2;
430 if (!c_dialect_cxx ())
431 set_std_c89 (false, true);
433 set_std_cxx98 (true);
444 warning (0, "%<-Wabi=1%> is not supported, using =2");
447 flag_abi_compat_version = value;
450 case OPT_fcanonical_system_headers:
451 cpp_opts->canonical_system_headers = value;
454 case OPT_fcond_mismatch:
455 if (!c_dialect_cxx ())
457 flag_cond_mismatch = value;
460 warning (0, "switch %qs is no longer supported", option->opt_text);
467 disable_builtin_function (arg);
470 case OPT_fdirectives_only:
471 cpp_opts->directives_only = value;
474 case OPT_fdollars_in_identifiers:
475 cpp_opts->dollars_in_ident = value;
478 case OPT_ffreestanding:
480 /* Fall through.... */
483 flag_no_builtin = !value;
486 case OPT_fconstant_string_class_:
487 constant_string_class_name = arg;
490 case OPT_fextended_identifiers:
491 cpp_opts->extended_identifiers = value;
494 case OPT_foperator_names:
495 cpp_opts->operator_names = value;
499 cpp_opts->restore_pch_deps = value;
502 case OPT_fpch_preprocess:
503 flag_pch_preprocess = value;
506 case OPT_fpermissive:
507 flag_permissive = value;
508 global_dc->permissive = value;
511 case OPT_fpreprocessed:
512 cpp_opts->preprocessed = value;
519 case OPT_ftrack_macro_expansion:
524 case OPT_ftrack_macro_expansion_:
525 if (arg && *arg != '\0')
526 cpp_opts->track_macro_expansion = value;
528 cpp_opts->track_macro_expansion = 2;
532 flag_use_repository = value;
534 flag_implicit_templates = 0;
538 /* It is documented that we silently ignore silly values. */
539 if (value >= 1 && value <= 100)
540 cpp_opts->tabstop = value;
543 case OPT_fexec_charset_:
544 cpp_opts->narrow_charset = arg;
547 case OPT_fwide_exec_charset_:
548 cpp_opts->wide_charset = arg;
551 case OPT_finput_charset_:
552 cpp_opts->input_charset = arg;
555 case OPT_ftemplate_depth_:
556 max_tinst_depth = value;
559 case OPT_fvisibility_inlines_hidden:
560 visibility_options.inlines_hidden = value;
563 case OPT_femit_struct_debug_baseonly:
564 set_struct_debug_option (&global_options, loc, "base");
567 case OPT_femit_struct_debug_reduced:
568 set_struct_debug_option (&global_options, loc,
569 "dir:ord:sys,dir:gen:any,ind:base");
572 case OPT_femit_struct_debug_detailed_:
573 set_struct_debug_option (&global_options, loc, arg);
576 case OPT_fext_numeric_literals:
577 cpp_opts->ext_numeric_literals = value;
581 add_path (xstrdup (arg), AFTER, 0, true);
586 defer_opt (code, arg);
598 add_path (xstrdup (arg), QUOTE, 0, true);
606 add_path (xstrdup (arg), SYSTEM, 0, true);
609 case OPT_iwithprefix:
610 add_prefixed_path (arg, SYSTEM);
613 case OPT_iwithprefixbefore:
614 add_prefixed_path (arg, BRACKET);
618 cpp_set_lang (parse_in, CLK_ASM);
619 cpp_opts->dollars_in_ident = false;
634 error ("output filename specified twice");
637 /* We need to handle the -Wpedantic switch here, rather than in
638 c_common_post_options, so that a subsequent -Wno-endif-labels
639 is not overridden. */
641 cpp_opts->cpp_pedantic = 1;
642 cpp_opts->warn_endif_labels = 1;
645 case OPT_print_objc_runtime_info:
646 print_struct_values = 1;
654 case OPT_std_gnu__98:
655 if (!preprocessing_asm_p)
656 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
660 case OPT_std_gnu__11:
661 if (!preprocessing_asm_p)
663 set_std_cxx11 (code == OPT_std_c__11 /* ISO */);
664 if (code == OPT_std_c__11)
665 cpp_opts->ext_numeric_literals = 0;
670 case OPT_std_gnu__14:
671 if (!preprocessing_asm_p)
673 set_std_cxx14 (code == OPT_std_c__14 /* ISO */);
674 if (code == OPT_std_c__14)
675 cpp_opts->ext_numeric_literals = 0;
680 case OPT_std_gnu__1z:
681 if (!preprocessing_asm_p)
683 set_std_cxx1z (code == OPT_std_c__1z /* ISO */);
684 if (code == OPT_std_c__1z)
685 cpp_opts->ext_numeric_literals = 0;
690 case OPT_std_iso9899_199409:
691 if (!preprocessing_asm_p)
692 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
696 if (!preprocessing_asm_p)
697 set_std_c89 (false /* c94 */, false /* ISO */);
701 if (!preprocessing_asm_p)
702 set_std_c99 (true /* ISO */);
706 if (!preprocessing_asm_p)
707 set_std_c99 (false /* ISO */);
711 if (!preprocessing_asm_p)
712 set_std_c11 (true /* ISO */);
716 if (!preprocessing_asm_p)
717 set_std_c11 (false /* ISO */);
721 cpp_opts->trigraphs = 1;
724 case OPT_traditional_cpp:
725 cpp_opts->traditional = 1;
740 C_handle_option_auto (&global_options, &global_options_set,
742 c_family_lang_mask, kind,
743 loc, handlers, global_dc);
747 ObjC_handle_option_auto (&global_options, &global_options_set,
749 c_family_lang_mask, kind,
750 loc, handlers, global_dc);
754 CXX_handle_option_auto (&global_options, &global_options_set,
756 c_family_lang_mask, kind,
757 loc, handlers, global_dc);
761 ObjCXX_handle_option_auto (&global_options, &global_options_set,
763 c_family_lang_mask, kind,
764 loc, handlers, global_dc);
771 cpp_handle_option_auto (&global_options, scode, cpp_opts);
775 /* Default implementation of TARGET_HANDLE_C_OPTION. */
778 default_handle_c_option (size_t code ATTRIBUTE_UNUSED,
779 const char *arg ATTRIBUTE_UNUSED,
780 int value ATTRIBUTE_UNUSED)
785 /* Post-switch processing. */
787 c_common_post_options (const char **pfilename)
789 struct cpp_callbacks *cb;
791 /* Canonicalize the input and output filenames. */
792 if (in_fnames == NULL)
794 in_fnames = XNEWVEC (const char *, 1);
797 else if (strcmp (in_fnames[0], "-") == 0)
800 if (out_fname == NULL || !strcmp (out_fname, "-"))
803 if (cpp_opts->deps.style == DEPS_NONE)
804 check_deps_environment_vars ();
806 handle_deferred_opts ();
808 sanitize_cpp_opts ();
810 register_include_chains (parse_in, sysroot, iprefix, imultilib,
811 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
813 #ifdef C_COMMON_OVERRIDE_OPTIONS
814 /* Some machines may reject certain combinations of C
815 language-specific options. */
816 C_COMMON_OVERRIDE_OPTIONS;
819 /* Excess precision other than "fast" requires front-end
821 if (c_dialect_cxx ())
823 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
824 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
825 sorry ("-fexcess-precision=standard for C++");
826 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
828 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
829 flag_excess_precision_cmdline = (flag_iso
830 ? EXCESS_PRECISION_STANDARD
831 : EXCESS_PRECISION_FAST);
833 /* ISO C restricts floating-point expression contraction to within
834 source-language expressions (-ffp-contract=on, currently an alias
835 for -ffp-contract=off). */
838 && (global_options_set.x_flag_fp_contract_mode
839 == (enum fp_contract_mode) 0)
840 && flag_unsafe_math_optimizations == 0)
841 flag_fp_contract_mode = FP_CONTRACT_OFF;
843 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
844 inline semantics are not supported in GNU89 or C89 mode. */
845 if (flag_gnu89_inline == -1)
846 flag_gnu89_inline = !flag_isoc99;
847 else if (!flag_gnu89_inline && !flag_isoc99)
848 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
850 /* Default to ObjC sjlj exception handling if NeXT runtime. */
851 if (flag_objc_sjlj_exceptions < 0)
852 flag_objc_sjlj_exceptions = flag_next_runtime;
853 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
856 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
857 pattern recognition. */
858 if (!global_options_set.x_flag_tree_loop_distribute_patterns
860 flag_tree_loop_distribute_patterns = 0;
862 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
863 It is never enabled in C++, as the minimum limit is not normative
865 if (c_dialect_cxx ())
866 warn_overlength_strings = 0;
868 /* Wmain is enabled by default in C++ but not in C. */
869 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
870 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
871 by -Wall, 1 if set by -Wmain). */
873 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
874 else if (warn_main == 2)
875 warn_main = flag_hosted ? 1 : 0;
877 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
878 yet been set, it is disabled by default. In C++, it is enabled
880 if (warn_enum_compare == -1)
881 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
883 /* -Wpacked-bitfield-compat is on by default for the C languages. The
884 warning is issued in stor-layout.c which is not part of the front-end so
885 we need to selectively turn it on here. */
886 if (warn_packed_bitfield_compat == -1)
887 warn_packed_bitfield_compat = 1;
889 /* Special format checking options don't work without -Wformat; warn if
893 warning (OPT_Wformat_y2k,
894 "-Wformat-y2k ignored without -Wformat");
895 warning (OPT_Wformat_extra_args,
896 "-Wformat-extra-args ignored without -Wformat");
897 warning (OPT_Wformat_zero_length,
898 "-Wformat-zero-length ignored without -Wformat");
899 warning (OPT_Wformat_nonliteral,
900 "-Wformat-nonliteral ignored without -Wformat");
901 warning (OPT_Wformat_contains_nul,
902 "-Wformat-contains-nul ignored without -Wformat");
903 warning (OPT_Wformat_security,
904 "-Wformat-security ignored without -Wformat");
907 /* -Wimplicit-function-declaration is enabled by default for C99. */
908 if (warn_implicit_function_declaration == -1)
909 warn_implicit_function_declaration = flag_isoc99;
911 /* Declone C++ 'structors if -Os. */
912 if (flag_declone_ctor_dtor == -1)
913 flag_declone_ctor_dtor = optimize_size;
915 if (flag_abi_compat_version == 1)
917 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
918 flag_abi_compat_version = 2;
920 else if (flag_abi_compat_version == -1)
922 /* Generate compatibility aliases for ABI v2 (3.4-4.9) by default. */
923 flag_abi_compat_version = (flag_abi_version == 0 ? 2 : 0);
925 /* But don't warn about backward compatibility unless explicitly
926 requested with -Wabi=n. */
927 if (flag_abi_version == 0)
931 if (cxx_dialect >= cxx11)
933 /* If we're allowing C++0x constructs, don't warn about C++98
934 identifiers which are keywords in C++0x. */
935 warn_cxx0x_compat = 0;
937 if (warn_narrowing == -1)
940 else if (warn_narrowing == -1)
943 if (flag_extern_tls_init)
945 #if !defined (ASM_OUTPUT_DEF) || !SUPPORTS_WEAK
946 /* Lazy TLS initialization for a variable in another TU requires
947 alias and weak reference support. */
948 if (flag_extern_tls_init > 0)
949 sorry ("external TLS initialization functions not supported "
951 flag_extern_tls_init = 0;
953 flag_extern_tls_init = 1;
957 if (flag_preprocess_only)
959 /* Open the output now. We must do so even if flag_no_output is
960 on, because there may be other output than from the actual
961 preprocessing (e.g. from -dM). */
962 if (out_fname[0] == '\0')
965 out_stream = fopen (out_fname, "w");
967 if (out_stream == NULL)
969 fatal_error ("opening output file %s: %m", out_fname);
973 if (num_in_fnames > 1)
974 error ("too many filenames given. Type %s --help for usage",
977 init_pp_output (out_stream);
983 /* When writing a PCH file, avoid reading some other PCH file,
984 because the default address space slot then can't be used
985 for the output PCH file. */
988 c_common_no_more_pch ();
989 /* Only -g0 and -gdwarf* are supported with PCH, for other
990 debug formats we warn here and refuse to load any PCH files. */
991 if (write_symbols != NO_DEBUG && write_symbols != DWARF2_DEBUG)
992 warning (OPT_Wdeprecated,
993 "the \"%s\" debug format cannot be used with "
994 "pre-compiled headers", debug_type_names[write_symbols]);
996 else if (write_symbols != NO_DEBUG && write_symbols != DWARF2_DEBUG)
997 c_common_no_more_pch ();
999 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1000 input_location = UNKNOWN_LOCATION;
1003 cb = cpp_get_callbacks (parse_in);
1004 cb->file_change = cb_file_change;
1005 cb->dir_change = cb_dir_change;
1006 cpp_post_options (parse_in);
1007 init_global_opts_from_cpp (&global_options, cpp_get_options (parse_in));
1009 input_location = UNKNOWN_LOCATION;
1011 *pfilename = this_input_filename
1012 = cpp_read_main_file (parse_in, in_fnames[0]);
1013 /* Don't do any compilation or preprocessing if there is no input file. */
1014 if (this_input_filename == NULL)
1020 if (flag_working_directory
1021 && flag_preprocess_only && !flag_no_line_commands)
1022 pp_dir_change (parse_in, get_src_pwd ());
1024 /* Disable LTO output when outputting a precompiled header. */
1025 if (pch_file && flag_lto)
1028 flag_generate_lto = 0;
1031 return flag_preprocess_only;
1034 /* Front end initialization common to C, ObjC and C++. */
1036 c_common_init (void)
1038 /* Set up preprocessor arithmetic. Must be done after call to
1039 c_common_nodes_and_builtins for type nodes to be good. */
1040 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1041 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1042 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1043 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1044 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1045 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1047 /* This can't happen until after wchar_precision and bytes_big_endian
1049 cpp_init_iconv (parse_in);
1054 fputs ("Compiler executable checksum: ", stderr);
1055 for (i = 0; i < 16; i++)
1056 fprintf (stderr, "%02x", executable_checksum[i]);
1057 putc ('\n', stderr);
1060 /* Has to wait until now so that cpplib has its hash table. */
1063 if (flag_preprocess_only)
1065 c_finish_options ();
1066 preprocess_file (parse_in);
1073 /* Initialize the integrated preprocessor after debug output has been
1074 initialized; loop over each input file. */
1076 c_common_parse_file (void)
1083 c_finish_options ();
1084 /* Open the dump files to use for the original and class dump output
1085 here, to be used during parsing for the current file. */
1086 original_dump_file = dump_begin (TDI_original, &original_dump_flags);
1087 class_dump_file = dump_begin (TDI_class, &class_dump_flags);
1092 /* And end the main input file, if the debug writer wants it */
1093 if (debug_hooks->start_end_main_source_file)
1094 (*debug_hooks->end_source_file) (0);
1095 if (++i >= num_in_fnames)
1097 cpp_undef_all (parse_in);
1098 cpp_clear_file_cache (parse_in);
1100 = cpp_read_main_file (parse_in, in_fnames[i]);
1101 if (original_dump_file)
1103 dump_end (TDI_original, original_dump_file);
1104 original_dump_file = NULL;
1106 if (class_dump_file)
1108 dump_end (TDI_class, class_dump_file);
1109 class_dump_file = NULL;
1111 /* If an input file is missing, abandon further compilation.
1112 cpplib has issued a diagnostic. */
1113 if (!this_input_filename)
1118 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1120 get_dump_info (int phase, int *flags)
1122 gcc_assert (phase == TDI_original || phase == TDI_class);
1123 if (phase == TDI_original)
1125 *flags = original_dump_flags;
1126 return original_dump_file;
1130 *flags = class_dump_flags;
1131 return class_dump_file;
1135 /* Common finish hook for the C, ObjC and C++ front ends. */
1137 c_common_finish (void)
1139 FILE *deps_stream = NULL;
1141 /* Don't write the deps file if there are errors. */
1142 if (cpp_opts->deps.style != DEPS_NONE && !seen_error ())
1144 /* If -M or -MM was seen without -MF, default output to the
1147 deps_stream = out_stream;
1150 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1152 fatal_error ("opening dependency file %s: %m", deps_file);
1156 /* For performance, avoid tearing down cpplib's internal structures
1157 with cpp_destroy (). */
1158 cpp_finish (parse_in, deps_stream);
1160 if (deps_stream && deps_stream != out_stream
1161 && (ferror (deps_stream) || fclose (deps_stream)))
1162 fatal_error ("closing dependency file %s: %m", deps_file);
1164 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1165 fatal_error ("when writing output to %s: %m", out_fname);
1168 /* Either of two environment variables can specify output of
1169 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1170 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1171 and DEPS_TARGET is the target to mention in the deps. They also
1172 result in dependency information being appended to the output file
1173 rather than overwriting it, and like Sun's compiler
1174 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1176 check_deps_environment_vars (void)
1180 spec = getenv ("DEPENDENCIES_OUTPUT");
1182 cpp_opts->deps.style = DEPS_USER;
1185 spec = getenv ("SUNPRO_DEPENDENCIES");
1188 cpp_opts->deps.style = DEPS_SYSTEM;
1189 cpp_opts->deps.ignore_main_file = true;
1195 /* Find the space before the DEPS_TARGET, if there is one. */
1196 char *s = strchr (spec, ' ');
1199 /* Let the caller perform MAKE quoting. */
1200 defer_opt (OPT_MT, s + 1);
1204 /* Command line -MF overrides environment variables and default. */
1213 /* Handle deferred command line switches. */
1215 handle_deferred_opts (void)
1220 /* Avoid allocating the deps buffer if we don't need it.
1221 (This flag may be true without there having been -MT or -MQ
1222 options, but we'll still need the deps buffer.) */
1226 deps = cpp_get_deps (parse_in);
1228 for (i = 0; i < deferred_count; i++)
1230 struct deferred_opt *opt = &deferred_opts[i];
1232 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1233 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1237 /* These settings are appropriate for GCC, but not necessarily so for
1238 cpplib as a library. */
1240 sanitize_cpp_opts (void)
1242 /* If we don't know what style of dependencies to output, complain
1243 if any other dependency switches have been given. */
1244 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1245 error ("to generate dependencies you must specify either -M or -MM");
1247 /* -dM and dependencies suppress normal output; do it here so that
1248 the last -d[MDN] switch overrides earlier ones. */
1249 if (flag_dump_macros == 'M')
1252 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1253 to perform proper macro expansion. */
1254 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1255 flag_dump_macros = 'D';
1257 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1258 -dM since at least glibc relies on -M -dM to work. */
1259 /* Also, flag_no_output implies flag_no_line_commands, always. */
1262 if (flag_dump_macros != 'M')
1263 flag_dump_macros = 0;
1264 flag_dump_includes = 0;
1265 flag_no_line_commands = 1;
1267 else if (cpp_opts->deps.missing_files)
1268 error ("-MG may only be used with -M or -MM");
1270 cpp_opts->unsigned_char = !flag_signed_char;
1271 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1272 cpp_opts->cpp_warn_c90_c99_compat = warn_c90_c99_compat;
1274 /* Wlong-long is disabled by default. It is enabled by:
1275 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1276 [-Wpedantic | -Wtraditional] -std=non-c99 ; or
1277 -Wc90-c99-compat, if specified.
1279 Either -Wlong-long or -Wno-long-long override any other settings. */
1280 if (warn_long_long == -1 && warn_c90_c99_compat != -1)
1281 warn_long_long = warn_c90_c99_compat;
1282 else if (warn_long_long == -1)
1283 warn_long_long = ((pedantic || warn_traditional)
1284 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1285 cpp_opts->cpp_warn_long_long = warn_long_long;
1287 /* If we're generating preprocessor output, emit current directory
1288 if explicitly requested or if debugging information is enabled.
1289 ??? Maybe we should only do it for debugging formats that
1290 actually output the current directory? */
1291 if (flag_working_directory == -1)
1292 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1294 if (cpp_opts->directives_only)
1296 if (cpp_warn_unused_macros)
1297 error ("-fdirectives-only is incompatible with -Wunused_macros");
1298 if (cpp_opts->traditional)
1299 error ("-fdirectives-only is incompatible with -traditional");
1303 /* Add include path with a prefix at the front of its name. */
1305 add_prefixed_path (const char *suffix, size_t chain)
1309 size_t prefix_len, suffix_len;
1311 suffix_len = strlen (suffix);
1312 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1313 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1315 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1316 memcpy (path, prefix, prefix_len);
1317 memcpy (path + prefix_len, suffix, suffix_len);
1318 path[prefix_len + suffix_len] = '\0';
1320 add_path (path, chain, 0, false);
1323 /* Handle -D, -U, -A, -imacros, and the first -include. */
1325 c_finish_options (void)
1327 if (!cpp_opts->preprocessed)
1331 cb_file_change (parse_in,
1332 linemap_add (line_table, LC_RENAME, 0,
1333 _("<built-in>"), 0));
1334 /* Make sure all of the builtins about to be declared have
1335 BUILTINS_LOCATION has their source_location. */
1336 source_location builtins_loc = BUILTINS_LOCATION;
1337 cpp_force_token_locations (parse_in, &builtins_loc);
1339 cpp_init_builtins (parse_in, flag_hosted);
1340 c_cpp_builtins (parse_in);
1342 cpp_stop_forcing_token_locations (parse_in);
1344 /* We're about to send user input to cpplib, so make it warn for
1345 things that we previously (when we sent it internal definitions)
1346 told it to not warn.
1348 C99 permits implementation-defined characters in identifiers.
1349 The documented meaning of -std= is to turn off extensions that
1350 conflict with the specified standard, and since a strictly
1351 conforming program cannot contain a '$', we do not condition
1352 their acceptance on the -std= setting. */
1353 cpp_opts->warn_dollars = (cpp_opts->cpp_pedantic && !cpp_opts->c99);
1355 cb_file_change (parse_in,
1356 linemap_add (line_table, LC_RENAME, 0,
1357 _("<command-line>"), 0));
1359 for (i = 0; i < deferred_count; i++)
1361 struct deferred_opt *opt = &deferred_opts[i];
1363 if (opt->code == OPT_D)
1364 cpp_define (parse_in, opt->arg);
1365 else if (opt->code == OPT_U)
1366 cpp_undef (parse_in, opt->arg);
1367 else if (opt->code == OPT_A)
1369 if (opt->arg[0] == '-')
1370 cpp_unassert (parse_in, opt->arg + 1);
1372 cpp_assert (parse_in, opt->arg);
1376 /* Start the main input file, if the debug writer wants it. */
1377 if (debug_hooks->start_end_main_source_file
1378 && !flag_preprocess_only)
1379 (*debug_hooks->start_source_file) (0, this_input_filename);
1381 /* Handle -imacros after -D and -U. */
1382 for (i = 0; i < deferred_count; i++)
1384 struct deferred_opt *opt = &deferred_opts[i];
1386 if (opt->code == OPT_imacros
1387 && cpp_push_include (parse_in, opt->arg))
1389 /* Disable push_command_line_include callback for now. */
1390 include_cursor = deferred_count + 1;
1391 cpp_scan_nooutput (parse_in);
1397 if (cpp_opts->directives_only)
1398 cpp_init_special_builtins (parse_in);
1400 /* Start the main input file, if the debug writer wants it. */
1401 if (debug_hooks->start_end_main_source_file
1402 && !flag_preprocess_only)
1403 (*debug_hooks->start_source_file) (0, this_input_filename);
1407 push_command_line_include ();
1410 /* Give CPP the next file given by -include, if any. */
1412 push_command_line_include (void)
1414 /* This can happen if disabled by -imacros for example.
1415 Punt so that we don't set "<command-line>" as the filename for
1417 if (include_cursor > deferred_count)
1420 if (!done_preinclude)
1422 done_preinclude = true;
1423 if (flag_hosted && std_inc && !cpp_opts->preprocessed)
1425 const char *preinc = targetcm.c_preinclude ();
1426 if (preinc && cpp_push_default_include (parse_in, preinc))
1431 pch_cpp_save_state ();
1433 while (include_cursor < deferred_count)
1435 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1437 if (!cpp_opts->preprocessed && opt->code == OPT_include
1438 && cpp_push_include (parse_in, opt->arg))
1442 if (include_cursor == deferred_count)
1445 /* -Wunused-macros should only warn about macros defined hereafter. */
1446 cpp_opts->warn_unused_macros = cpp_warn_unused_macros;
1447 /* Restore the line map from <command line>. */
1448 if (!cpp_opts->preprocessed)
1449 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1451 /* Set this here so the client can change the option if it wishes,
1452 and after stacking the main file so we don't trace the main file. */
1453 line_table->trace_includes = cpp_opts->print_include_names;
1457 /* File change callback. Has to handle -include files. */
1459 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1460 const struct line_map *new_map)
1462 if (flag_preprocess_only)
1463 pp_file_change (new_map);
1465 fe_file_change (new_map);
1468 && (new_map->reason == LC_ENTER || new_map->reason == LC_RENAME))
1470 /* Signal to plugins that a file is included. This could happen
1471 several times with the same file path, e.g. because of
1472 several '#include' or '#line' directives... */
1473 invoke_plugin_callbacks
1474 (PLUGIN_INCLUDE_FILE,
1475 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map)));
1478 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1480 pch_cpp_save_state ();
1481 push_command_line_include ();
1486 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1488 if (!set_src_pwd (dir))
1489 warning (0, "too late for # directive to set debug directory");
1492 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1493 extensions if ISO). There is no concept of gnu94. */
1495 set_std_c89 (int c94, int iso)
1497 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1500 flag_no_gnu_keywords = iso;
1501 flag_no_nonansi_builtin = iso;
1507 /* Set the C 99 standard (without GNU extensions if ISO). */
1509 set_std_c99 (int iso)
1511 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1513 flag_no_nonansi_builtin = iso;
1520 /* Set the C 11 standard (without GNU extensions if ISO). */
1522 set_std_c11 (int iso)
1524 cpp_set_lang (parse_in, iso ? CLK_STDC11: CLK_GNUC11);
1526 flag_no_nonansi_builtin = iso;
1533 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1535 set_std_cxx98 (int iso)
1537 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1538 flag_no_gnu_keywords = iso;
1539 flag_no_nonansi_builtin = iso;
1541 cxx_dialect = cxx98;
1544 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1546 set_std_cxx11 (int iso)
1548 cpp_set_lang (parse_in, iso ? CLK_CXX11: CLK_GNUCXX11);
1549 flag_no_gnu_keywords = iso;
1550 flag_no_nonansi_builtin = iso;
1552 /* C++11 includes the C99 standard library. */
1555 cxx_dialect = cxx11;
1558 /* Set the C++ 2014 draft standard (without GNU extensions if ISO). */
1560 set_std_cxx14 (int iso)
1562 cpp_set_lang (parse_in, iso ? CLK_CXX14: CLK_GNUCXX14);
1563 flag_no_gnu_keywords = iso;
1564 flag_no_nonansi_builtin = iso;
1566 /* C++11 includes the C99 standard library. */
1569 cxx_dialect = cxx14;
1572 /* Set the C++ 201z draft standard (without GNU extensions if ISO). */
1574 set_std_cxx1z (int iso)
1576 cpp_set_lang (parse_in, iso ? CLK_CXX1Z: CLK_GNUCXX1Z);
1577 flag_no_gnu_keywords = iso;
1578 flag_no_nonansi_builtin = iso;
1580 /* C++11 includes the C99 standard library. */
1584 cxx_dialect = cxx1z;
1587 /* Args to -d specify what to dump. Silently ignore
1588 unrecognized options; they may be aimed at toplev.c. */
1590 handle_OPT_d (const char *arg)
1594 while ((c = *arg++) != '\0')
1597 case 'M': /* Dump macros only. */
1598 case 'N': /* Dump names. */
1599 case 'D': /* Dump definitions. */
1600 case 'U': /* Dump used macros. */
1601 flag_dump_macros = c;
1605 flag_dump_includes = 1;