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_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;
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;
411 cpp_opts->warn_trigraphs = value;
412 cpp_opts->warn_comments = value;
413 cpp_opts->warn_num_sign_change = value;
415 if (warn_pointer_sign == -1)
416 warn_pointer_sign = value;
419 case OPT_Wbuiltin_macro_redefined:
420 cpp_opts->warn_builtin_macro_redefined = value;
424 cpp_opts->warn_comments = value;
427 case OPT_Wc___compat:
428 /* Because -Wenum-compare is the default in C++, -Wc++-compat
429 implies -Wenum-compare. */
430 if (warn_enum_compare == -1 && value)
431 warn_enum_compare = value;
432 /* Because C++ always warns about a goto which misses an
433 initialization, -Wc++-compat turns on -Wjump-misses-init. */
434 if (warn_jump_misses_init == -1 && value)
435 warn_jump_misses_init = value;
436 cpp_opts->warn_cxx_operator_names = value;
439 case OPT_Wdeprecated:
440 cpp_opts->cpp_warn_deprecated = value;
443 case OPT_Wendif_labels:
444 cpp_opts->warn_endif_labels = value;
448 global_dc->warning_as_error_requested = value;
456 set_Wformat (atoi (arg));
460 gcc_assert (value == 0 || value == 1);
461 if (warn_implicit_int == -1)
462 handle_generated_option (&global_options, &global_options_set,
463 OPT_Wimplicit_int, NULL, value,
464 c_family_lang_mask, kind, loc, handlers,
466 if (warn_implicit_function_declaration == -1)
467 handle_generated_option (&global_options, &global_options_set,
468 OPT_Wimplicit_function_declaration, NULL,
469 value, c_family_lang_mask, kind, loc,
470 handlers, global_dc);
473 case OPT_Winvalid_pch:
474 cpp_opts->warn_invalid_pch = value;
478 cpp_opts->cpp_warn_long_long = value;
481 case OPT_Wmissing_include_dirs:
482 cpp_opts->warn_missing_include_dirs = value;
486 cpp_opts->warn_multichar = value;
489 case OPT_Wnormalized_:
490 if (kind == DK_ERROR)
493 inform (input_location, "-Werror=normalized=: set -Wnormalized=nfc");
494 cpp_opts->warn_normalize = normalized_C;
498 if (!value || (arg && strcasecmp (arg, "none") == 0))
499 cpp_opts->warn_normalize = normalized_none;
500 else if (!arg || strcasecmp (arg, "nfkc") == 0)
501 cpp_opts->warn_normalize = normalized_KC;
502 else if (strcasecmp (arg, "id") == 0)
503 cpp_opts->warn_normalize = normalized_identifier_C;
504 else if (strcasecmp (arg, "nfc") == 0)
505 cpp_opts->warn_normalize = normalized_C;
507 error ("argument %qs to %<-Wnormalized%> not recognized", arg);
511 case OPT_Wreturn_type:
512 warn_return_type = value;
515 case OPT_Wtraditional:
516 cpp_opts->cpp_warn_traditional = value;
520 cpp_opts->warn_trigraphs = value;
524 cpp_opts->warn_undef = value;
527 case OPT_Wunknown_pragmas:
528 /* Set to greater than 1, so that even unknown pragmas in
529 system headers will be warned about. */
530 warn_unknown_pragmas = value * 2;
533 case OPT_Wunused_macros:
534 warn_unused_macros = value;
537 case OPT_Wvariadic_macros:
538 warn_variadic_macros = value;
541 case OPT_Wwrite_strings:
542 warn_write_strings = value;
548 warn_nonvdtor = true;
552 if (!c_dialect_cxx ())
553 set_std_c89 (false, true);
555 set_std_cxx98 (true);
562 case OPT_fcond_mismatch:
563 if (!c_dialect_cxx ())
565 flag_cond_mismatch = value;
568 warning (0, "switch %qs is no longer supported", option->opt_text);
575 disable_builtin_function (arg);
578 case OPT_fdirectives_only:
579 cpp_opts->directives_only = value;
582 case OPT_fdollars_in_identifiers:
583 cpp_opts->dollars_in_ident = value;
586 case OPT_ffreestanding:
588 /* Fall through.... */
591 flag_no_builtin = !value;
594 case OPT_fconstant_string_class_:
595 constant_string_class_name = arg;
598 case OPT_fextended_identifiers:
599 cpp_opts->extended_identifiers = value;
602 case OPT_fgnu_runtime:
603 flag_next_runtime = !value;
606 case OPT_fnext_runtime:
607 flag_next_runtime = value;
610 case OPT_foperator_names:
611 cpp_opts->operator_names = value;
615 cpp_opts->restore_pch_deps = value;
618 case OPT_fpch_preprocess:
619 flag_pch_preprocess = value;
622 case OPT_fpermissive:
623 flag_permissive = value;
624 global_dc->permissive = value;
627 case OPT_fpreprocessed:
628 cpp_opts->preprocessed = value;
635 case OPT_ftrack_macro_expansion:
640 case OPT_ftrack_macro_expansion_:
641 if (arg && *arg != '\0')
642 cpp_opts->track_macro_expansion = value;
644 cpp_opts->track_macro_expansion = 2;
648 flag_use_repository = value;
650 flag_implicit_templates = 0;
654 /* It is documented that we silently ignore silly values. */
655 if (value >= 1 && value <= 100)
656 cpp_opts->tabstop = value;
659 case OPT_fexec_charset_:
660 cpp_opts->narrow_charset = arg;
663 case OPT_fwide_exec_charset_:
664 cpp_opts->wide_charset = arg;
667 case OPT_finput_charset_:
668 cpp_opts->input_charset = arg;
671 case OPT_ftemplate_depth_:
672 max_tinst_depth = value;
675 case OPT_fvisibility_inlines_hidden:
676 visibility_options.inlines_hidden = value;
679 case OPT_femit_struct_debug_baseonly:
680 set_struct_debug_option (&global_options, loc, "base");
683 case OPT_femit_struct_debug_reduced:
684 set_struct_debug_option (&global_options, loc,
685 "dir:ord:sys,dir:gen:any,ind:base");
688 case OPT_femit_struct_debug_detailed_:
689 set_struct_debug_option (&global_options, loc, arg);
693 add_path (xstrdup (arg), AFTER, 0, true);
698 defer_opt (code, arg);
710 add_path (xstrdup (arg), QUOTE, 0, true);
718 add_path (xstrdup (arg), SYSTEM, 0, true);
721 case OPT_iwithprefix:
722 add_prefixed_path (arg, SYSTEM);
725 case OPT_iwithprefixbefore:
726 add_prefixed_path (arg, BRACKET);
730 cpp_set_lang (parse_in, CLK_ASM);
731 cpp_opts->dollars_in_ident = false;
746 error ("output filename specified twice");
749 /* We need to handle the -pedantic switches here, rather than in
750 c_common_post_options, so that a subsequent -Wno-endif-labels
751 is not overridden. */
752 case OPT_pedantic_errors:
754 cpp_opts->cpp_pedantic = 1;
755 cpp_opts->warn_endif_labels = 1;
756 if (warn_pointer_sign == -1)
757 warn_pointer_sign = 1;
758 if (warn_overlength_strings == -1)
759 warn_overlength_strings = 1;
764 case OPT_print_objc_runtime_info:
765 print_struct_values = 1;
773 case OPT_std_gnu__98:
774 if (!preprocessing_asm_p)
775 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
779 case OPT_std_gnu__11:
780 if (!preprocessing_asm_p)
781 set_std_cxx11 (code == OPT_std_c__11 /* ISO */);
785 case OPT_std_iso9899_199409:
786 if (!preprocessing_asm_p)
787 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
791 if (!preprocessing_asm_p)
792 set_std_c89 (false /* c94 */, false /* ISO */);
796 if (!preprocessing_asm_p)
797 set_std_c99 (true /* ISO */);
801 if (!preprocessing_asm_p)
802 set_std_c99 (false /* ISO */);
806 if (!preprocessing_asm_p)
807 set_std_c1x (true /* ISO */);
811 if (!preprocessing_asm_p)
812 set_std_c1x (false /* ISO */);
816 cpp_opts->trigraphs = 1;
819 case OPT_traditional_cpp:
820 cpp_opts->traditional = 1;
835 /* Default implementation of TARGET_HANDLE_C_OPTION. */
838 default_handle_c_option (size_t code ATTRIBUTE_UNUSED,
839 const char *arg ATTRIBUTE_UNUSED,
840 int value ATTRIBUTE_UNUSED)
845 /* Post-switch processing. */
847 c_common_post_options (const char **pfilename)
849 struct cpp_callbacks *cb;
851 /* Canonicalize the input and output filenames. */
852 if (in_fnames == NULL)
854 in_fnames = XNEWVEC (const char *, 1);
857 else if (strcmp (in_fnames[0], "-") == 0)
860 if (out_fname == NULL || !strcmp (out_fname, "-"))
863 if (cpp_opts->deps.style == DEPS_NONE)
864 check_deps_environment_vars ();
866 handle_deferred_opts ();
868 sanitize_cpp_opts ();
870 register_include_chains (parse_in, sysroot, iprefix, imultilib,
871 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
873 #ifdef C_COMMON_OVERRIDE_OPTIONS
874 /* Some machines may reject certain combinations of C
875 language-specific options. */
876 C_COMMON_OVERRIDE_OPTIONS;
879 /* Excess precision other than "fast" requires front-end
881 if (c_dialect_cxx ())
883 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
884 && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
885 sorry ("-fexcess-precision=standard for C++");
886 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
888 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
889 flag_excess_precision_cmdline = (flag_iso
890 ? EXCESS_PRECISION_STANDARD
891 : EXCESS_PRECISION_FAST);
893 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
894 inline semantics are not supported in GNU89 or C89 mode. */
895 if (flag_gnu89_inline == -1)
896 flag_gnu89_inline = !flag_isoc99;
897 else if (!flag_gnu89_inline && !flag_isoc99)
898 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
900 /* Default to ObjC sjlj exception handling if NeXT runtime. */
901 if (flag_objc_sjlj_exceptions < 0)
902 flag_objc_sjlj_exceptions = flag_next_runtime;
903 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
906 /* -Wextra implies the following flags
907 unless explicitly overridden. */
908 if (warn_type_limits == -1)
909 warn_type_limits = extra_warnings;
910 if (warn_clobbered == -1)
911 warn_clobbered = extra_warnings;
912 if (warn_empty_body == -1)
913 warn_empty_body = extra_warnings;
914 if (warn_sign_compare == -1)
915 warn_sign_compare = extra_warnings;
916 if (warn_missing_field_initializers == -1)
917 warn_missing_field_initializers = extra_warnings;
918 if (warn_missing_parameter_type == -1)
919 warn_missing_parameter_type = extra_warnings;
920 if (warn_old_style_declaration == -1)
921 warn_old_style_declaration = extra_warnings;
922 if (warn_override_init == -1)
923 warn_override_init = extra_warnings;
924 if (warn_ignored_qualifiers == -1)
925 warn_ignored_qualifiers = extra_warnings;
927 /* -Wpointer-sign is disabled by default, but it is enabled if any
928 of -Wall or -pedantic are given. */
929 if (warn_pointer_sign == -1)
930 warn_pointer_sign = 0;
932 if (warn_strict_aliasing == -1)
933 warn_strict_aliasing = 0;
934 if (warn_strict_overflow == -1)
935 warn_strict_overflow = 0;
936 if (warn_jump_misses_init == -1)
937 warn_jump_misses_init = 0;
939 /* -Woverlength-strings is off by default, but is enabled by -pedantic.
940 It is never enabled in C++, as the minimum limit is not normative
942 if (warn_overlength_strings == -1 || c_dialect_cxx ())
943 warn_overlength_strings = 0;
945 /* Wmain is enabled by default in C++ but not in C. */
946 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
947 even if -Wall was given (warn_main will be 2 if set by -Wall, 1
948 if set by -Wmain). */
950 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
951 else if (warn_main == 2)
952 warn_main = flag_hosted ? 1 : 0;
954 /* In C, -Wconversion enables -Wsign-conversion (unless disabled
955 through -Wno-sign-conversion). While in C++,
956 -Wsign-conversion needs to be requested explicitly. */
957 if (warn_sign_conversion == -1)
958 warn_sign_conversion = (c_dialect_cxx ()) ? 0 : warn_conversion;
960 /* In C, -Wall and -Wc++-compat enable -Wenum-compare, which we do
961 in c_common_handle_option; if it has not yet been set, it is
962 disabled by default. In C++, it is enabled by default. */
963 if (warn_enum_compare == -1)
964 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
966 /* -Wpacked-bitfield-compat is on by default for the C languages. The
967 warning is issued in stor-layout.c which is not part of the front-end so
968 we need to selectively turn it on here. */
969 if (warn_packed_bitfield_compat == -1)
970 warn_packed_bitfield_compat = 1;
972 /* Special format checking options don't work without -Wformat; warn if
976 warning (OPT_Wformat_y2k,
977 "-Wformat-y2k ignored without -Wformat");
978 warning (OPT_Wformat_extra_args,
979 "-Wformat-extra-args ignored without -Wformat");
980 warning (OPT_Wformat_zero_length,
981 "-Wformat-zero-length ignored without -Wformat");
982 warning (OPT_Wformat_nonliteral,
983 "-Wformat-nonliteral ignored without -Wformat");
984 warning (OPT_Wformat_contains_nul,
985 "-Wformat-contains-nul ignored without -Wformat");
986 warning (OPT_Wformat_security,
987 "-Wformat-security ignored without -Wformat");
990 if (warn_implicit == -1)
993 if (warn_implicit_int == -1)
994 warn_implicit_int = 0;
996 /* -Wimplicit-function-declaration is enabled by default for C99. */
997 if (warn_implicit_function_declaration == -1)
998 warn_implicit_function_declaration = flag_isoc99;
1000 /* If we're allowing C++0x constructs, don't warn about C++0x
1001 compatibility problems. */
1002 if (cxx_dialect == cxx0x)
1003 warn_cxx0x_compat = 0;
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 return flag_preprocess_only;
1064 /* Front end initialization common to C, ObjC and C++. */
1066 c_common_init (void)
1068 /* Set up preprocessor arithmetic. Must be done after call to
1069 c_common_nodes_and_builtins for type nodes to be good. */
1070 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1071 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1072 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1073 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1074 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1075 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1077 /* This can't happen until after wchar_precision and bytes_big_endian
1079 cpp_init_iconv (parse_in);
1082 c_common_print_pch_checksum (stderr);
1084 /* Has to wait until now so that cpplib has its hash table. */
1087 if (flag_preprocess_only)
1089 c_finish_options ();
1090 preprocess_file (parse_in);
1097 /* Initialize the integrated preprocessor after debug output has been
1098 initialized; loop over each input file. */
1100 c_common_parse_file (void)
1107 c_finish_options ();
1112 /* And end the main input file, if the debug writer wants it */
1113 if (debug_hooks->start_end_main_source_file)
1114 (*debug_hooks->end_source_file) (0);
1115 if (++i >= num_in_fnames)
1117 cpp_undef_all (parse_in);
1118 cpp_clear_file_cache (parse_in);
1120 = cpp_read_main_file (parse_in, in_fnames[i]);
1121 /* If an input file is missing, abandon further compilation.
1122 cpplib has issued a diagnostic. */
1123 if (!this_input_filename)
1128 /* Common finish hook for the C, ObjC and C++ front ends. */
1130 c_common_finish (void)
1132 FILE *deps_stream = NULL;
1134 /* Don't write the deps file if there are errors. */
1135 if (cpp_opts->deps.style != DEPS_NONE && !seen_error ())
1137 /* If -M or -MM was seen without -MF, default output to the
1140 deps_stream = out_stream;
1143 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1145 fatal_error ("opening dependency file %s: %m", deps_file);
1149 /* For performance, avoid tearing down cpplib's internal structures
1150 with cpp_destroy (). */
1151 cpp_finish (parse_in, deps_stream);
1153 if (deps_stream && deps_stream != out_stream
1154 && (ferror (deps_stream) || fclose (deps_stream)))
1155 fatal_error ("closing dependency file %s: %m", deps_file);
1157 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1158 fatal_error ("when writing output to %s: %m", out_fname);
1161 /* Either of two environment variables can specify output of
1162 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1163 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1164 and DEPS_TARGET is the target to mention in the deps. They also
1165 result in dependency information being appended to the output file
1166 rather than overwriting it, and like Sun's compiler
1167 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1169 check_deps_environment_vars (void)
1173 spec = getenv ("DEPENDENCIES_OUTPUT");
1175 cpp_opts->deps.style = DEPS_USER;
1178 spec = getenv ("SUNPRO_DEPENDENCIES");
1181 cpp_opts->deps.style = DEPS_SYSTEM;
1182 cpp_opts->deps.ignore_main_file = true;
1188 /* Find the space before the DEPS_TARGET, if there is one. */
1189 char *s = strchr (spec, ' ');
1192 /* Let the caller perform MAKE quoting. */
1193 defer_opt (OPT_MT, s + 1);
1197 /* Command line -MF overrides environment variables and default. */
1206 /* Handle deferred command line switches. */
1208 handle_deferred_opts (void)
1213 /* Avoid allocating the deps buffer if we don't need it.
1214 (This flag may be true without there having been -MT or -MQ
1215 options, but we'll still need the deps buffer.) */
1219 deps = cpp_get_deps (parse_in);
1221 for (i = 0; i < deferred_count; i++)
1223 struct deferred_opt *opt = &deferred_opts[i];
1225 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1226 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1230 /* These settings are appropriate for GCC, but not necessarily so for
1231 cpplib as a library. */
1233 sanitize_cpp_opts (void)
1235 /* If we don't know what style of dependencies to output, complain
1236 if any other dependency switches have been given. */
1237 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1238 error ("to generate dependencies you must specify either -M or -MM");
1240 /* -dM and dependencies suppress normal output; do it here so that
1241 the last -d[MDN] switch overrides earlier ones. */
1242 if (flag_dump_macros == 'M')
1245 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1246 to perform proper macro expansion. */
1247 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1248 flag_dump_macros = 'D';
1250 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1251 -dM since at least glibc relies on -M -dM to work. */
1252 /* Also, flag_no_output implies flag_no_line_commands, always. */
1255 if (flag_dump_macros != 'M')
1256 flag_dump_macros = 0;
1257 flag_dump_includes = 0;
1258 flag_no_line_commands = 1;
1260 else if (cpp_opts->deps.missing_files)
1261 error ("-MG may only be used with -M or -MM");
1263 cpp_opts->unsigned_char = !flag_signed_char;
1264 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1266 /* Wlong-long is disabled by default. It is enabled by:
1267 [-pedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1268 [-pedantic | -Wtraditional] -std=non-c99 .
1270 Either -Wlong-long or -Wno-long-long override any other settings. */
1271 if (warn_long_long == -1)
1272 warn_long_long = ((pedantic || warn_traditional)
1273 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1274 cpp_opts->cpp_warn_long_long = warn_long_long;
1276 /* Similarly with -Wno-variadic-macros. No check for c99 here, since
1277 this also turns off warnings about GCCs extension. */
1278 cpp_opts->warn_variadic_macros
1279 = warn_variadic_macros && (pedantic || warn_traditional);
1281 /* If we're generating preprocessor output, emit current directory
1282 if explicitly requested or if debugging information is enabled.
1283 ??? Maybe we should only do it for debugging formats that
1284 actually output the current directory? */
1285 if (flag_working_directory == -1)
1286 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1288 if (cpp_opts->directives_only)
1290 if (warn_unused_macros)
1291 error ("-fdirectives-only is incompatible with -Wunused_macros");
1292 if (cpp_opts->traditional)
1293 error ("-fdirectives-only is incompatible with -traditional");
1297 /* Add include path with a prefix at the front of its name. */
1299 add_prefixed_path (const char *suffix, size_t chain)
1303 size_t prefix_len, suffix_len;
1305 suffix_len = strlen (suffix);
1306 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1307 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1309 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1310 memcpy (path, prefix, prefix_len);
1311 memcpy (path + prefix_len, suffix, suffix_len);
1312 path[prefix_len + suffix_len] = '\0';
1314 add_path (path, chain, 0, false);
1317 /* Handle -D, -U, -A, -imacros, and the first -include. */
1319 c_finish_options (void)
1321 if (!cpp_opts->preprocessed)
1326 /* Make sure all of the builtins about to be declared have
1327 BUILTINS_LOCATION has their source_location. */
1328 source_location builtins_loc = BUILTINS_LOCATION;
1329 cpp_force_token_locations (parse_in, &builtins_loc);
1331 cpp_init_builtins (parse_in, flag_hosted);
1332 c_cpp_builtins (parse_in);
1334 cpp_stop_forcing_token_locations (parse_in);
1337 /* We're about to send user input to cpplib, so make it warn for
1338 things that we previously (when we sent it internal definitions)
1339 told it to not warn.
1341 C99 permits implementation-defined characters in identifiers.
1342 The documented meaning of -std= is to turn off extensions that
1343 conflict with the specified standard, and since a strictly
1344 conforming program cannot contain a '$', we do not condition
1345 their acceptance on the -std= setting. */
1346 cpp_opts->warn_dollars = (cpp_opts->cpp_pedantic && !cpp_opts->c99);
1348 cb_file_change (parse_in,
1349 linemap_add (line_table, LC_RENAME, 0,
1350 _("<command-line>"), 0));
1352 for (i = 0; i < deferred_count; i++)
1354 struct deferred_opt *opt = &deferred_opts[i];
1356 if (opt->code == OPT_D)
1357 cpp_define (parse_in, opt->arg);
1358 else if (opt->code == OPT_U)
1359 cpp_undef (parse_in, opt->arg);
1360 else if (opt->code == OPT_A)
1362 if (opt->arg[0] == '-')
1363 cpp_unassert (parse_in, opt->arg + 1);
1365 cpp_assert (parse_in, opt->arg);
1369 /* Start the main input file, if the debug writer wants it. */
1370 if (debug_hooks->start_end_main_source_file
1371 && !flag_preprocess_only)
1372 (*debug_hooks->start_source_file) (0, this_input_filename);
1374 /* Handle -imacros after -D and -U. */
1375 for (i = 0; i < deferred_count; i++)
1377 struct deferred_opt *opt = &deferred_opts[i];
1379 if (opt->code == OPT_imacros
1380 && cpp_push_include (parse_in, opt->arg))
1382 /* Disable push_command_line_include callback for now. */
1383 include_cursor = deferred_count + 1;
1384 cpp_scan_nooutput (parse_in);
1390 if (cpp_opts->directives_only)
1391 cpp_init_special_builtins (parse_in);
1393 /* Start the main input file, if the debug writer wants it. */
1394 if (debug_hooks->start_end_main_source_file
1395 && !flag_preprocess_only)
1396 (*debug_hooks->start_source_file) (0, this_input_filename);
1400 push_command_line_include ();
1403 /* Give CPP the next file given by -include, if any. */
1405 push_command_line_include (void)
1407 while (include_cursor < deferred_count)
1409 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1411 if (!cpp_opts->preprocessed && opt->code == OPT_include
1412 && cpp_push_include (parse_in, opt->arg))
1416 if (include_cursor == deferred_count)
1419 /* -Wunused-macros should only warn about macros defined hereafter. */
1420 cpp_opts->warn_unused_macros = warn_unused_macros;
1421 /* Restore the line map from <command line>. */
1422 if (!cpp_opts->preprocessed)
1423 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1425 /* Set this here so the client can change the option if it wishes,
1426 and after stacking the main file so we don't trace the main file. */
1427 line_table->trace_includes = cpp_opts->print_include_names;
1431 /* File change callback. Has to handle -include files. */
1433 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1434 const struct line_map *new_map)
1436 if (flag_preprocess_only)
1437 pp_file_change (new_map);
1439 fe_file_change (new_map);
1441 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1442 push_command_line_include ();
1446 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1448 if (!set_src_pwd (dir))
1449 warning (0, "too late for # directive to set debug directory");
1452 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1453 extensions if ISO). There is no concept of gnu94. */
1455 set_std_c89 (int c94, int iso)
1457 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1460 flag_no_gnu_keywords = iso;
1461 flag_no_nonansi_builtin = iso;
1467 /* Set the C 99 standard (without GNU extensions if ISO). */
1469 set_std_c99 (int iso)
1471 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1473 flag_no_nonansi_builtin = iso;
1480 /* Set the C 1X standard draft (without GNU extensions if ISO). */
1482 set_std_c1x (int iso)
1484 cpp_set_lang (parse_in, iso ? CLK_STDC1X: CLK_GNUC1X);
1486 flag_no_nonansi_builtin = iso;
1493 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1495 set_std_cxx98 (int iso)
1497 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1498 flag_no_gnu_keywords = iso;
1499 flag_no_nonansi_builtin = iso;
1501 cxx_dialect = cxx98;
1504 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1506 set_std_cxx11 (int iso)
1508 cpp_set_lang (parse_in, iso ? CLK_CXX11: CLK_GNUCXX11);
1509 flag_no_gnu_keywords = iso;
1510 flag_no_nonansi_builtin = iso;
1512 /* C++11 includes the C99 standard library. */
1515 cxx_dialect = cxx11;
1518 /* Args to -d specify what to dump. Silently ignore
1519 unrecognized options; they may be aimed at toplev.c. */
1521 handle_OPT_d (const char *arg)
1525 while ((c = *arg++) != '\0')
1528 case 'M': /* Dump macros only. */
1529 case 'N': /* Dump names. */
1530 case 'D': /* Dump definitions. */
1531 case 'U': /* Dump used macros. */
1532 flag_dump_macros = c;
1536 flag_dump_includes = 1;