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_cxx11 (int);
114 static void set_std_c89 (int, int);
115 static void set_std_c99 (int);
116 static void set_std_c11 (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;
387 warn_maybe_uninitialized = value;
389 if (!c_dialect_cxx ())
391 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
392 can turn it off only if it's not explicit. */
394 warn_main = (value ? 2 : 0);
396 /* In C, -Wall turns on -Wenum-compare, which we do here.
397 In C++ it is on by default, which is done in
398 c_common_post_options. */
399 if (warn_enum_compare == -1)
400 warn_enum_compare = value;
404 /* C++-specific warnings. */
405 warn_sign_compare = value;
406 warn_reorder = value;
407 warn_cxx0x_compat = value;
408 warn_delnonvdtor = value;
409 warn_narrowing = value;
412 cpp_opts->warn_trigraphs = value;
413 cpp_opts->warn_comments = value;
414 cpp_opts->warn_num_sign_change = value;
416 if (warn_pointer_sign == -1)
417 warn_pointer_sign = value;
420 case OPT_Wbuiltin_macro_redefined:
421 cpp_opts->warn_builtin_macro_redefined = value;
425 cpp_opts->warn_comments = value;
428 case OPT_Wc___compat:
429 /* Because -Wenum-compare is the default in C++, -Wc++-compat
430 implies -Wenum-compare. */
431 if (warn_enum_compare == -1 && value)
432 warn_enum_compare = value;
433 /* Because C++ always warns about a goto which misses an
434 initialization, -Wc++-compat turns on -Wjump-misses-init. */
435 if (warn_jump_misses_init == -1 && value)
436 warn_jump_misses_init = value;
437 cpp_opts->warn_cxx_operator_names = value;
440 case OPT_Wc__0x_compat:
441 warn_narrowing = value;
444 case OPT_Wdeprecated:
445 cpp_opts->cpp_warn_deprecated = value;
448 case OPT_Wendif_labels:
449 cpp_opts->warn_endif_labels = value;
457 set_Wformat (atoi (arg));
461 gcc_assert (value == 0 || value == 1);
462 if (warn_implicit_int == -1)
463 handle_generated_option (&global_options, &global_options_set,
464 OPT_Wimplicit_int, NULL, value,
465 c_family_lang_mask, kind, loc, handlers,
467 if (warn_implicit_function_declaration == -1)
468 handle_generated_option (&global_options, &global_options_set,
469 OPT_Wimplicit_function_declaration, NULL,
470 value, c_family_lang_mask, kind, loc,
471 handlers, global_dc);
474 case OPT_Winvalid_pch:
475 cpp_opts->warn_invalid_pch = value;
479 cpp_opts->cpp_warn_long_long = value;
482 case OPT_Wmissing_include_dirs:
483 cpp_opts->warn_missing_include_dirs = value;
487 cpp_opts->warn_multichar = value;
490 case OPT_Wnormalized_:
491 if (kind == DK_ERROR)
494 inform (input_location, "-Werror=normalized=: set -Wnormalized=nfc");
495 cpp_opts->warn_normalize = normalized_C;
499 if (!value || (arg && strcasecmp (arg, "none") == 0))
500 cpp_opts->warn_normalize = normalized_none;
501 else if (!arg || strcasecmp (arg, "nfkc") == 0)
502 cpp_opts->warn_normalize = normalized_KC;
503 else if (strcasecmp (arg, "id") == 0)
504 cpp_opts->warn_normalize = normalized_identifier_C;
505 else if (strcasecmp (arg, "nfc") == 0)
506 cpp_opts->warn_normalize = normalized_C;
508 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
512 case OPT_Wreturn_type:
513 warn_return_type = value;
516 case OPT_Wtraditional:
517 cpp_opts->cpp_warn_traditional = value;
521 cpp_opts->warn_trigraphs = value;
525 cpp_opts->warn_undef = value;
528 case OPT_Wunknown_pragmas:
529 /* Set to greater than 1, so that even unknown pragmas in
530 system headers will be warned about. */
531 warn_unknown_pragmas = value * 2;
534 case OPT_Wunused_macros:
535 warn_unused_macros = value;
538 case OPT_Wvariadic_macros:
539 warn_variadic_macros = value;
542 case OPT_Wwrite_strings:
543 warn_write_strings = value;
549 warn_nonvdtor = true;
553 if (!c_dialect_cxx ())
554 set_std_c89 (false, true);
556 set_std_cxx98 (true);
563 case OPT_fcond_mismatch:
564 if (!c_dialect_cxx ())
566 flag_cond_mismatch = value;
569 warning (0, "switch %qs is no longer supported", option->opt_text);
576 disable_builtin_function (arg);
579 case OPT_fdirectives_only:
580 cpp_opts->directives_only = value;
583 case OPT_fdollars_in_identifiers:
584 cpp_opts->dollars_in_ident = value;
587 case OPT_ffreestanding:
589 /* Fall through.... */
592 flag_no_builtin = !value;
595 case OPT_fconstant_string_class_:
596 constant_string_class_name = arg;
599 case OPT_fextended_identifiers:
600 cpp_opts->extended_identifiers = value;
603 case OPT_foperator_names:
604 cpp_opts->operator_names = value;
608 cpp_opts->restore_pch_deps = value;
611 case OPT_fpch_preprocess:
612 flag_pch_preprocess = value;
615 case OPT_fpermissive:
616 flag_permissive = value;
617 global_dc->permissive = value;
620 case OPT_fpreprocessed:
621 cpp_opts->preprocessed = value;
628 case OPT_ftrack_macro_expansion:
633 case OPT_ftrack_macro_expansion_:
634 if (arg && *arg != '\0')
635 cpp_opts->track_macro_expansion = value;
637 cpp_opts->track_macro_expansion = 2;
641 flag_use_repository = value;
643 flag_implicit_templates = 0;
647 /* It is documented that we silently ignore silly values. */
648 if (value >= 1 && value <= 100)
649 cpp_opts->tabstop = value;
652 case OPT_fexec_charset_:
653 cpp_opts->narrow_charset = arg;
656 case OPT_fwide_exec_charset_:
657 cpp_opts->wide_charset = arg;
660 case OPT_finput_charset_:
661 cpp_opts->input_charset = arg;
664 case OPT_ftemplate_depth_:
665 max_tinst_depth = value;
668 case OPT_fvisibility_inlines_hidden:
669 visibility_options.inlines_hidden = value;
672 case OPT_femit_struct_debug_baseonly:
673 set_struct_debug_option (&global_options, loc, "base");
676 case OPT_femit_struct_debug_reduced:
677 set_struct_debug_option (&global_options, loc,
678 "dir:ord:sys,dir:gen:any,ind:base");
681 case OPT_femit_struct_debug_detailed_:
682 set_struct_debug_option (&global_options, loc, arg);
686 add_path (xstrdup (arg), AFTER, 0, true);
691 defer_opt (code, arg);
703 add_path (xstrdup (arg), QUOTE, 0, true);
711 add_path (xstrdup (arg), SYSTEM, 0, true);
714 case OPT_iwithprefix:
715 add_prefixed_path (arg, SYSTEM);
718 case OPT_iwithprefixbefore:
719 add_prefixed_path (arg, BRACKET);
723 cpp_set_lang (parse_in, CLK_ASM);
724 cpp_opts->dollars_in_ident = false;
739 error ("output filename specified twice");
742 /* We need to handle the -pedantic switches here, rather than in
743 c_common_post_options, so that a subsequent -Wno-endif-labels
744 is not overridden. */
745 case OPT_pedantic_errors:
747 cpp_opts->cpp_pedantic = 1;
748 cpp_opts->warn_endif_labels = 1;
749 if (warn_pointer_sign == -1)
750 warn_pointer_sign = 1;
751 if (warn_overlength_strings == -1)
752 warn_overlength_strings = 1;
757 case OPT_print_objc_runtime_info:
758 print_struct_values = 1;
766 case OPT_std_gnu__98:
767 if (!preprocessing_asm_p)
768 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
772 case OPT_std_gnu__11:
773 if (!preprocessing_asm_p)
774 set_std_cxx11 (code == OPT_std_c__11 /* ISO */);
778 case OPT_std_iso9899_199409:
779 if (!preprocessing_asm_p)
780 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
784 if (!preprocessing_asm_p)
785 set_std_c89 (false /* c94 */, false /* ISO */);
789 if (!preprocessing_asm_p)
790 set_std_c99 (true /* ISO */);
794 if (!preprocessing_asm_p)
795 set_std_c99 (false /* ISO */);
799 if (!preprocessing_asm_p)
800 set_std_c11 (true /* ISO */);
804 if (!preprocessing_asm_p)
805 set_std_c11 (false /* ISO */);
809 cpp_opts->trigraphs = 1;
812 case OPT_traditional_cpp:
813 cpp_opts->traditional = 1;
828 /* Default implementation of TARGET_HANDLE_C_OPTION. */
831 default_handle_c_option (size_t code ATTRIBUTE_UNUSED,
832 const char *arg ATTRIBUTE_UNUSED,
833 int value ATTRIBUTE_UNUSED)
838 /* Post-switch processing. */
840 c_common_post_options (const char **pfilename)
842 struct cpp_callbacks *cb;
844 /* Canonicalize the input and output filenames. */
845 if (in_fnames == NULL)
847 in_fnames = XNEWVEC (const char *, 1);
850 else if (strcmp (in_fnames[0], "-") == 0)
853 if (out_fname == NULL || !strcmp (out_fname, "-"))
856 if (cpp_opts->deps.style == DEPS_NONE)
857 check_deps_environment_vars ();
859 handle_deferred_opts ();
861 sanitize_cpp_opts ();
863 register_include_chains (parse_in, sysroot, iprefix, imultilib,
864 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
866 #ifdef C_COMMON_OVERRIDE_OPTIONS
867 /* Some machines may reject certain combinations of C
868 language-specific options. */
869 C_COMMON_OVERRIDE_OPTIONS;
872 /* Excess precision other than "fast" requires front-end
874 if (c_dialect_cxx ())
876 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
877 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
878 sorry ("-fexcess-precision=standard for C++");
879 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
881 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
882 flag_excess_precision_cmdline = (flag_iso
883 ? EXCESS_PRECISION_STANDARD
884 : EXCESS_PRECISION_FAST);
886 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
887 inline semantics are not supported in GNU89 or C89 mode. */
888 if (flag_gnu89_inline == -1)
889 flag_gnu89_inline = !flag_isoc99;
890 else if (!flag_gnu89_inline && !flag_isoc99)
891 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
893 /* Default to ObjC sjlj exception handling if NeXT runtime. */
894 if (flag_objc_sjlj_exceptions < 0)
895 flag_objc_sjlj_exceptions = flag_next_runtime;
896 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
899 /* -Wextra implies the following flags
900 unless explicitly overridden. */
901 if (warn_type_limits == -1)
902 warn_type_limits = extra_warnings;
903 if (warn_clobbered == -1)
904 warn_clobbered = extra_warnings;
905 if (warn_empty_body == -1)
906 warn_empty_body = extra_warnings;
907 if (warn_sign_compare == -1)
908 warn_sign_compare = extra_warnings;
909 if (warn_missing_field_initializers == -1)
910 warn_missing_field_initializers = extra_warnings;
911 if (warn_missing_parameter_type == -1)
912 warn_missing_parameter_type = extra_warnings;
913 if (warn_old_style_declaration == -1)
914 warn_old_style_declaration = extra_warnings;
915 if (warn_override_init == -1)
916 warn_override_init = extra_warnings;
917 if (warn_ignored_qualifiers == -1)
918 warn_ignored_qualifiers = extra_warnings;
920 /* -Wpointer-sign is disabled by default, but it is enabled if any
921 of -Wall or -pedantic are given. */
922 if (warn_pointer_sign == -1)
923 warn_pointer_sign = 0;
925 if (warn_strict_aliasing == -1)
926 warn_strict_aliasing = 0;
927 if (warn_strict_overflow == -1)
928 warn_strict_overflow = 0;
929 if (warn_jump_misses_init == -1)
930 warn_jump_misses_init = 0;
932 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
933 It is never enabled in C++, as the minimum limit is not normative
935 if (warn_overlength_strings == -1 || c_dialect_cxx ())
936 warn_overlength_strings = 0;
938 /* Wmain is enabled by default in C++ but not in C. */
939 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
940 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
941 if set by -Wmain). */
943 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
944 else if (warn_main == 2)
945 warn_main = flag_hosted ? 1 : 0;
947 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
948 through -Wno-sign-conversion). While in C++,
949 -Wsign-conversion needs to be requested explicitly. */
950 if (warn_sign_conversion == -1)
951 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
953 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
954 in c_common_handle_option; if it has not yet been set, it is
955 disabled by default. In C++, it is enabled by default. */
956 if (warn_enum_compare == -1)
957 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
959 /* -Wpacked-bitfield-compat is on by default for the C languages. The
960 warning is issued in stor-layout.c which is not part of the front-end so
961 we need to selectively turn it on here. */
962 if (warn_packed_bitfield_compat == -1)
963 warn_packed_bitfield_compat = 1;
965 /* Special format checking options don't work without -Wformat; warn if
969 warning (OPT_Wformat_y2k,
970 "-Wformat-y2k ignored without -Wformat");
971 warning (OPT_Wformat_extra_args,
972 "-Wformat-extra-args ignored without -Wformat");
973 warning (OPT_Wformat_zero_length,
974 "-Wformat-zero-length ignored without -Wformat");
975 warning (OPT_Wformat_nonliteral,
976 "-Wformat-nonliteral ignored without -Wformat");
977 warning (OPT_Wformat_contains_nul,
978 "-Wformat-contains-nul ignored without -Wformat");
979 warning (OPT_Wformat_security,
980 "-Wformat-security ignored without -Wformat");
983 if (warn_implicit == -1)
986 if (warn_implicit_int == -1)
987 warn_implicit_int = 0;
989 /* -Wimplicit-function-declaration is enabled by default for C99. */
990 if (warn_implicit_function_declaration == -1)
991 warn_implicit_function_declaration = flag_isoc99;
993 if (cxx_dialect == cxx0x)
995 /* If we're allowing C++0x constructs, don't warn about C++98
996 identifiers which are keywords in C++0x. */
997 warn_cxx0x_compat = 0;
999 if (warn_narrowing == -1)
1002 else if (warn_narrowing == -1)
1005 if (flag_preprocess_only)
1007 /* Open the output now. We must do so even if flag_no_output is
1008 on, because there may be other output than from the actual
1009 preprocessing (e.g. from -dM). */
1010 if (out_fname[0] == '\0')
1011 out_stream = stdout;
1013 out_stream = fopen (out_fname, "w");
1015 if (out_stream == NULL)
1017 fatal_error ("opening output file %s: %m", out_fname);
1021 if (num_in_fnames > 1)
1022 error ("too many filenames given. Type %s --help for usage",
1025 init_pp_output (out_stream);
1031 /* When writing a PCH file, avoid reading some other PCH file,
1032 because the default address space slot then can't be used
1033 for the output PCH file. */
1035 c_common_no_more_pch ();
1037 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1038 input_location = UNKNOWN_LOCATION;
1041 cb = cpp_get_callbacks (parse_in);
1042 cb->file_change = cb_file_change;
1043 cb->dir_change = cb_dir_change;
1044 cpp_post_options (parse_in);
1046 input_location = UNKNOWN_LOCATION;
1048 *pfilename = this_input_filename
1049 = cpp_read_main_file (parse_in, in_fnames[0]);
1050 /* Don't do any compilation or preprocessing if there is no input file. */
1051 if (this_input_filename == NULL)
1057 if (flag_working_directory
1058 && flag_preprocess_only && !flag_no_line_commands)
1059 pp_dir_change (parse_in, get_src_pwd ());
1061 /* Disable LTO output when outputting a precompiled header. */
1062 if (pch_file && flag_lto)
1065 flag_generate_lto = 0;
1068 return flag_preprocess_only;
1071 /* Front end initialization common to C, ObjC and C++. */
1073 c_common_init (void)
1075 /* Set up preprocessor arithmetic. Must be done after call to
1076 c_common_nodes_and_builtins for type nodes to be good. */
1077 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1078 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1079 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1080 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1081 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1082 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1084 /* This can't happen until after wchar_precision and bytes_big_endian
1086 cpp_init_iconv (parse_in);
1089 c_common_print_pch_checksum (stderr);
1091 /* Has to wait until now so that cpplib has its hash table. */
1094 if (flag_preprocess_only)
1096 c_finish_options ();
1097 preprocess_file (parse_in);
1104 /* Initialize the integrated preprocessor after debug output has been
1105 initialized; loop over each input file. */
1107 c_common_parse_file (void)
1114 c_finish_options ();
1119 /* And end the main input file, if the debug writer wants it */
1120 if (debug_hooks->start_end_main_source_file)
1121 (*debug_hooks->end_source_file) (0);
1122 if (++i >= num_in_fnames)
1124 cpp_undef_all (parse_in);
1125 cpp_clear_file_cache (parse_in);
1127 = cpp_read_main_file (parse_in, in_fnames[i]);
1128 /* If an input file is missing, abandon further compilation.
1129 cpplib has issued a diagnostic. */
1130 if (!this_input_filename)
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;
1273 /* Wlong-long is disabled by default. It is enabled by:
1274 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1275 [-pedantic | -Wtraditional] -std=non-c99 .
1277 Either -Wlong-long or -Wno-long-long override any other settings. */
1278 if (warn_long_long == -1)
1279 warn_long_long = ((pedantic || warn_traditional)
1280 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1281 cpp_opts->cpp_warn_long_long = warn_long_long;
1283 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1284 this also turns off warnings about GCCs extension. */
1285 cpp_opts->warn_variadic_macros
1286 = warn_variadic_macros && (pedantic || warn_traditional);
1288 /* If we're generating preprocessor output, emit current directory
1289 if explicitly requested or if debugging information is enabled.
1290 ??? Maybe we should only do it for debugging formats that
1291 actually output the current directory? */
1292 if (flag_working_directory == -1)
1293 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1295 if (cpp_opts->directives_only)
1297 if (warn_unused_macros)
1298 error ("-fdirectives-only is incompatible with -Wunused_macros");
1299 if (cpp_opts->traditional)
1300 error ("-fdirectives-only is incompatible with -traditional");
1304 /* Add include path with a prefix at the front of its name. */
1306 add_prefixed_path (const char *suffix, size_t chain)
1310 size_t prefix_len, suffix_len;
1312 suffix_len = strlen (suffix);
1313 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1314 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1316 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1317 memcpy (path, prefix, prefix_len);
1318 memcpy (path + prefix_len, suffix, suffix_len);
1319 path[prefix_len + suffix_len] = '\0';
1321 add_path (path, chain, 0, false);
1324 /* Handle -D, -U, -A, -imacros, and the first -include. */
1326 c_finish_options (void)
1328 if (!cpp_opts->preprocessed)
1333 /* Make sure all of the builtins about to be declared have
1334 BUILTINS_LOCATION has their source_location. */
1335 source_location builtins_loc = BUILTINS_LOCATION;
1336 cpp_force_token_locations (parse_in, &builtins_loc);
1338 cpp_init_builtins (parse_in, flag_hosted);
1339 c_cpp_builtins (parse_in);
1341 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 while (include_cursor < deferred_count)
1416 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1418 if (!cpp_opts->preprocessed && opt->code == OPT_include
1419 && cpp_push_include (parse_in, opt->arg))
1423 if (include_cursor == deferred_count)
1426 /* -Wunused-macros should only warn about macros defined hereafter. */
1427 cpp_opts->warn_unused_macros = warn_unused_macros;
1428 /* Restore the line map from <command line>. */
1429 if (!cpp_opts->preprocessed)
1430 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1432 /* Set this here so the client can change the option if it wishes,
1433 and after stacking the main file so we don't trace the main file. */
1434 line_table->trace_includes = cpp_opts->print_include_names;
1438 /* File change callback. Has to handle -include files. */
1440 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1441 const struct line_map *new_map)
1443 if (flag_preprocess_only)
1444 pp_file_change (new_map);
1446 fe_file_change (new_map);
1448 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1449 push_command_line_include ();
1453 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1455 if (!set_src_pwd (dir))
1456 warning (0, "too late for # directive to set debug directory");
1459 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1460 extensions if ISO). There is no concept of gnu94. */
1462 set_std_c89 (int c94, int iso)
1464 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1467 flag_no_gnu_keywords = iso;
1468 flag_no_nonansi_builtin = iso;
1474 /* Set the C 99 standard (without GNU extensions if ISO). */
1476 set_std_c99 (int iso)
1478 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1480 flag_no_nonansi_builtin = iso;
1487 /* Set the C 11 standard (without GNU extensions if ISO). */
1489 set_std_c11 (int iso)
1491 cpp_set_lang (parse_in, iso ? CLK_STDC11: CLK_GNUC11);
1493 flag_no_nonansi_builtin = iso;
1500 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1502 set_std_cxx98 (int iso)
1504 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1505 flag_no_gnu_keywords = iso;
1506 flag_no_nonansi_builtin = iso;
1508 cxx_dialect = cxx98;
1511 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1513 set_std_cxx11 (int iso)
1515 cpp_set_lang (parse_in, iso ? CLK_CXX11: CLK_GNUCXX11);
1516 flag_no_gnu_keywords = iso;
1517 flag_no_nonansi_builtin = iso;
1519 /* C++11 includes the C99 standard library. */
1522 cxx_dialect = cxx11;
1525 /* Args to -d specify what to dump. Silently ignore
1526 unrecognized options; they may be aimed at toplev.c. */
1528 handle_OPT_d (const char *arg)
1532 while ((c = *arg++) != '\0')
1535 case 'M': /* Dump macros only. */
1536 case 'N': /* Dump names. */
1537 case 'D': /* Dump definitions. */
1538 case 'U': /* Dump used macros. */
1539 flag_dump_macros = c;
1543 flag_dump_includes = 1;