1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002-2018 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
4
5 This file is part of GCC.
6
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
10 version.
11
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
15 for more details.
16
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/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "tm.h"
25 #include "c-target.h"
26 #include "c-common.h"
27 #include "memmodel.h"
28 #include "tm_p.h" /* For C_COMMON_OVERRIDE_OPTIONS. */
29 #include "diagnostic.h"
30 #include "c-pragma.h"
31 #include "flags.h"
32 #include "toplev.h"
33 #include "langhooks.h"
34 #include "tree-diagnostic.h" /* for virt_loc_aware_diagnostic_finalizer */
35 #include "intl.h"
36 #include "cppdefault.h"
37 #include "incpath.h"
38 #include "debug.h" /* For debug_hooks. */
39 #include "opts.h"
40 #include "plugin.h" /* For PLUGIN_INCLUDE_FILE event. */
41 #include "mkdeps.h"
42 #include "dumpfile.h"
43 #include "file-prefix-map.h" /* add_*_prefix_map() */
44
45 #ifndef DOLLARS_IN_IDENTIFIERS
46 # define DOLLARS_IN_IDENTIFIERS true
47 #endif
48
49 #ifndef TARGET_SYSTEM_ROOT
50 # define TARGET_SYSTEM_ROOT NULL
51 #endif
52
53 #ifndef TARGET_OPTF
54 #define TARGET_OPTF(ARG)
55 #endif
56
57 /* CPP's options. */
58 cpp_options *cpp_opts;
59
60 /* Input filename. */
61 static const char *this_input_filename;
62
63 /* Filename and stream for preprocessed output. */
64 static const char *out_fname;
65 static FILE *out_stream;
66
67 /* Append dependencies to deps_file. */
68 static bool deps_append;
69
70 /* If dependency switches (-MF etc.) have been given. */
71 static bool deps_seen;
72
73 /* If -v seen. */
74 static bool verbose;
75
76 /* Dependency output file. */
77 static const char *deps_file;
78
79 /* The prefix given by -iprefix, if any. */
80 static const char *iprefix;
81
82 /* The multilib directory given by -imultilib, if any. */
83 static const char *imultilib;
84
85 /* The system root, if any. Overridden by -isysroot. */
86 static const char *sysroot = TARGET_SYSTEM_ROOT;
87
88 /* Zero disables all standard directories for headers. */
89 static bool std_inc = true;
90
91 /* Zero disables the C++-specific standard directories for headers. */
92 static bool std_cxx_inc = true;
93
94 /* If the quote chain has been split by -I-. */
95 static bool quote_chain_split;
96
97 /* Number of deferred options. */
98 static size_t deferred_count;
99
100 /* Number of deferred options scanned for -include. */
101 static size_t include_cursor;
102
103 /* Dump files/flags to use during parsing. */
104 static FILE *original_dump_file = NULL;
105 static dump_flags_t original_dump_flags;
106
107 /* Whether any standard preincluded header has been preincluded. */
108 static bool done_preinclude;
109
110 static void handle_OPT_d (const char *);
111 static void set_std_cxx98 (int);
112 static void set_std_cxx11 (int);
113 static void set_std_cxx14 (int);
114 static void set_std_cxx17 (int);
115 static void set_std_cxx2a (int);
116 static void set_std_c89 (int, int);
117 static void set_std_c99 (int);
118 static void set_std_c11 (int);
119 static void set_std_c17 (int);
120 static void check_deps_environment_vars (void);
121 static void handle_deferred_opts (void);
122 static void sanitize_cpp_opts (void);
123 static void add_prefixed_path (const char *, incpath_kind);
124 static void push_command_line_include (void);
125 static void cb_file_change (cpp_reader *, const line_map_ordinary *);
126 static void cb_dir_change (cpp_reader *, const char *);
127 static void c_finish_options (void);
128
129 #ifndef STDC_0_IN_SYSTEM_HEADERS
130 #define STDC_0_IN_SYSTEM_HEADERS 0
131 #endif
132
133 /* Holds switches parsed by c_common_handle_option (), but whose
134 handling is deferred to c_common_post_options (). */
135 static void defer_opt (enum opt_code, const char *);
136 static struct deferred_opt
137 {
138 enum opt_code code;
139 const char *arg;
140 } *deferred_opts;
141
142
143 extern const unsigned int
144 c_family_lang_mask = (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX);
145
146 /* Defer option CODE with argument ARG. */
147 static void
defer_opt(enum opt_code code,const char * arg)148 defer_opt (enum opt_code code, const char *arg)
149 {
150 deferred_opts[deferred_count].code = code;
151 deferred_opts[deferred_count].arg = arg;
152 deferred_count++;
153 }
154
155 /* Return language mask for option parsing. */
156 unsigned int
c_common_option_lang_mask(void)157 c_common_option_lang_mask (void)
158 {
159 static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
160
161 return lang_flags[c_language];
162 }
163
164 /* Diagnostic finalizer for C/C++/Objective-C/Objective-C++. */
165 static void
c_diagnostic_finalizer(diagnostic_context * context,diagnostic_info * diagnostic)166 c_diagnostic_finalizer (diagnostic_context *context,
167 diagnostic_info *diagnostic)
168 {
169 diagnostic_show_locus (context, diagnostic->richloc, diagnostic->kind);
170 /* By default print macro expansion contexts in the diagnostic
171 finalizer -- for tokens resulting from macro expansion. */
172 virt_loc_aware_diagnostic_finalizer (context, diagnostic);
173 pp_destroy_prefix (context->printer);
174 pp_flush (context->printer);
175 }
176
177 /* Common default settings for diagnostics. */
178 void
c_common_diagnostics_set_defaults(diagnostic_context * context)179 c_common_diagnostics_set_defaults (diagnostic_context *context)
180 {
181 diagnostic_finalizer (context) = c_diagnostic_finalizer;
182 context->opt_permissive = OPT_fpermissive;
183 }
184
185 /* Whether options from all C-family languages should be accepted
186 quietly. */
187 static bool accept_all_c_family_options = false;
188
189 /* Return whether to complain about a wrong-language option. */
190 bool
c_common_complain_wrong_lang_p(const struct cl_option * option)191 c_common_complain_wrong_lang_p (const struct cl_option *option)
192 {
193 if (accept_all_c_family_options
194 && (option->flags & c_family_lang_mask))
195 return false;
196
197 return true;
198 }
199
200 /* Initialize options structure OPTS. */
201 void
c_common_init_options_struct(struct gcc_options * opts)202 c_common_init_options_struct (struct gcc_options *opts)
203 {
204 opts->x_flag_exceptions = c_dialect_cxx ();
205 opts->x_warn_pointer_arith = c_dialect_cxx ();
206 opts->x_warn_write_strings = c_dialect_cxx ();
207 opts->x_flag_warn_unused_result = true;
208
209 /* By default, C99-like requirements for complex multiply and divide. */
210 opts->x_flag_complex_method = 2;
211 }
212
213 /* Common initialization before calling option handlers. */
214 void
c_common_init_options(unsigned int decoded_options_count,struct cl_decoded_option * decoded_options)215 c_common_init_options (unsigned int decoded_options_count,
216 struct cl_decoded_option *decoded_options)
217 {
218 unsigned int i;
219 struct cpp_callbacks *cb;
220
221 g_string_concat_db
222 = new (ggc_alloc <string_concat_db> ()) string_concat_db ();
223
224 parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
225 ident_hash, line_table);
226 cb = cpp_get_callbacks (parse_in);
227 cb->error = c_cpp_error;
228
229 cpp_opts = cpp_get_options (parse_in);
230 cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
231 cpp_opts->objc = c_dialect_objc ();
232
233 /* Reset to avoid warnings on internal definitions. We set it just
234 before passing on command-line options to cpplib. */
235 cpp_opts->warn_dollars = 0;
236
237 deferred_opts = XNEWVEC (struct deferred_opt, decoded_options_count);
238
239 if (c_language == clk_c)
240 {
241 /* The default for C is gnu17. */
242 set_std_c17 (false /* ISO */);
243
244 /* If preprocessing assembly language, accept any of the C-family
245 front end options since the driver may pass them through. */
246 for (i = 1; i < decoded_options_count; i++)
247 if (decoded_options[i].opt_index == OPT_lang_asm)
248 {
249 accept_all_c_family_options = true;
250 break;
251 }
252 }
253
254 /* Set C++ standard to C++14 if not specified on the command line. */
255 if (c_dialect_cxx ())
256 set_std_cxx14 (/*ISO*/false);
257
258 global_dc->colorize_source_p = true;
259 }
260
261 /* Handle switch SCODE with argument ARG. VALUE is true, unless no-
262 form of an -f or -W option was given. Returns false if the switch was
263 invalid, true if valid. Use HANDLERS in recursive handle_option calls. */
264 bool
c_common_handle_option(size_t scode,const char * arg,int value,int kind,location_t loc,const struct cl_option_handlers * handlers)265 c_common_handle_option (size_t scode, const char *arg, int value,
266 int kind, location_t loc,
267 const struct cl_option_handlers *handlers)
268 {
269 const struct cl_option *option = &cl_options[scode];
270 enum opt_code code = (enum opt_code) scode;
271 bool result = true;
272
273 /* Prevent resetting the language standard to a C dialect when the driver
274 has already determined that we're looking at assembler input. */
275 bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
276
277 switch (code)
278 {
279 default:
280 if (cl_options[code].flags & c_family_lang_mask)
281 {
282 if ((option->flags & CL_TARGET)
283 && ! targetcm.handle_c_option (scode, arg, value))
284 result = false;
285 break;
286 }
287 result = false;
288 break;
289
290 case OPT__output_pch_:
291 pch_file = arg;
292 break;
293
294 case OPT_A:
295 defer_opt (code, arg);
296 break;
297
298 case OPT_C:
299 cpp_opts->discard_comments = 0;
300 break;
301
302 case OPT_CC:
303 cpp_opts->discard_comments = 0;
304 cpp_opts->discard_comments_in_macro_exp = 0;
305 break;
306
307 case OPT_D:
308 defer_opt (code, arg);
309 break;
310
311 case OPT_H:
312 cpp_opts->print_include_names = 1;
313 break;
314
315 case OPT_F:
316 TARGET_OPTF (xstrdup (arg));
317 break;
318
319 case OPT_I:
320 if (strcmp (arg, "-"))
321 add_path (xstrdup (arg), INC_BRACKET, 0, true);
322 else
323 {
324 if (quote_chain_split)
325 error ("-I- specified twice");
326 quote_chain_split = true;
327 split_quote_chain ();
328 inform (input_location, "obsolete option -I- used, please use -iquote instead");
329 }
330 break;
331
332 case OPT_M:
333 case OPT_MM:
334 /* When doing dependencies with -M or -MM, suppress normal
335 preprocessed output, but still do -dM etc. as software
336 depends on this. Preprocessed output does occur if -MD, -MMD
337 or environment var dependency generation is used. */
338 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
339 flag_no_output = 1;
340 break;
341
342 case OPT_MD:
343 case OPT_MMD:
344 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
345 cpp_opts->deps.need_preprocessor_output = true;
346 deps_file = arg;
347 break;
348
349 case OPT_MF:
350 deps_seen = true;
351 deps_file = arg;
352 break;
353
354 case OPT_MG:
355 deps_seen = true;
356 cpp_opts->deps.missing_files = true;
357 break;
358
359 case OPT_MP:
360 deps_seen = true;
361 cpp_opts->deps.phony_targets = true;
362 break;
363
364 case OPT_MQ:
365 case OPT_MT:
366 deps_seen = true;
367 defer_opt (code, arg);
368 break;
369
370 case OPT_P:
371 flag_no_line_commands = 1;
372 break;
373
374 case OPT_U:
375 defer_opt (code, arg);
376 break;
377
378 case OPT_Wall:
379 /* ??? Don't add new options here. Use LangEnabledBy in c.opt. */
380
381 cpp_opts->warn_num_sign_change = value;
382 break;
383
384 case OPT_Walloca_larger_than_:
385 if (!value)
386 inform (loc, "-Walloca-larger-than=0 is meaningless");
387 break;
388
389 case OPT_Wvla_larger_than_:
390 if (!value)
391 inform (loc, "-Wvla-larger-than=0 is meaningless");
392 break;
393
394 case OPT_Wunknown_pragmas:
395 /* Set to greater than 1, so that even unknown pragmas in
396 system headers will be warned about. */
397 /* ??? There is no way to handle this automatically for now. */
398 warn_unknown_pragmas = value * 2;
399 break;
400
401 case OPT_ansi:
402 if (!c_dialect_cxx ())
403 set_std_c89 (false, true);
404 else
405 set_std_cxx98 (true);
406 break;
407
408 case OPT_d:
409 handle_OPT_d (arg);
410 break;
411
412 case OPT_Wabi_:
413 warn_abi = true;
414 if (value == 1)
415 {
416 warning (0, "%<-Wabi=1%> is not supported, using =2");
417 value = 2;
418 }
419 warn_abi_version = value;
420 break;
421
422 case OPT_fcanonical_system_headers:
423 cpp_opts->canonical_system_headers = value;
424 break;
425
426 case OPT_fcond_mismatch:
427 if (!c_dialect_cxx ())
428 {
429 flag_cond_mismatch = value;
430 break;
431 }
432 warning (0, "switch %qs is no longer supported", option->opt_text);
433 break;
434
435 case OPT_fbuiltin_:
436 if (value)
437 result = false;
438 else
439 disable_builtin_function (arg);
440 break;
441
442 case OPT_fdirectives_only:
443 cpp_opts->directives_only = value;
444 break;
445
446 case OPT_fdollars_in_identifiers:
447 cpp_opts->dollars_in_ident = value;
448 break;
449
450 case OPT_fmacro_prefix_map_:
451 add_macro_prefix_map (arg);
452 break;
453
454 case OPT_ffreestanding:
455 value = !value;
456 /* Fall through. */
457 case OPT_fhosted:
458 flag_hosted = value;
459 flag_no_builtin = !value;
460 break;
461
462 case OPT_fconstant_string_class_:
463 constant_string_class_name = arg;
464 break;
465
466 case OPT_fextended_identifiers:
467 cpp_opts->extended_identifiers = value;
468 break;
469
470 case OPT_foperator_names:
471 cpp_opts->operator_names = value;
472 break;
473
474 case OPT_fpch_deps:
475 cpp_opts->restore_pch_deps = value;
476 break;
477
478 case OPT_fpch_preprocess:
479 flag_pch_preprocess = value;
480 break;
481
482 case OPT_fpermissive:
483 flag_permissive = value;
484 global_dc->permissive = value;
485 break;
486
487 case OPT_fpreprocessed:
488 cpp_opts->preprocessed = value;
489 break;
490
491 case OPT_fdebug_cpp:
492 cpp_opts->debug = 1;
493 break;
494
495 case OPT_ftrack_macro_expansion:
496 if (value)
497 value = 2;
498 /* Fall Through. */
499
500 case OPT_ftrack_macro_expansion_:
501 if (arg && *arg != '\0')
502 cpp_opts->track_macro_expansion = value;
503 else
504 cpp_opts->track_macro_expansion = 2;
505 break;
506
507 case OPT_frepo:
508 flag_use_repository = value;
509 if (value)
510 flag_implicit_templates = 0;
511 break;
512
513 case OPT_ftabstop_:
514 /* It is documented that we silently ignore silly values. */
515 if (value >= 1 && value <= 100)
516 cpp_opts->tabstop = value;
517 break;
518
519 case OPT_fexec_charset_:
520 cpp_opts->narrow_charset = arg;
521 break;
522
523 case OPT_fwide_exec_charset_:
524 cpp_opts->wide_charset = arg;
525 break;
526
527 case OPT_finput_charset_:
528 cpp_opts->input_charset = arg;
529 break;
530
531 case OPT_ftemplate_depth_:
532 max_tinst_depth = value;
533 break;
534
535 case OPT_fvisibility_inlines_hidden:
536 visibility_options.inlines_hidden = value;
537 break;
538
539 case OPT_femit_struct_debug_baseonly:
540 set_struct_debug_option (&global_options, loc, "base");
541 break;
542
543 case OPT_femit_struct_debug_reduced:
544 set_struct_debug_option (&global_options, loc,
545 "dir:ord:sys,dir:gen:any,ind:base");
546 break;
547
548 case OPT_femit_struct_debug_detailed_:
549 set_struct_debug_option (&global_options, loc, arg);
550 break;
551
552 case OPT_fext_numeric_literals:
553 cpp_opts->ext_numeric_literals = value;
554 break;
555
556 case OPT_idirafter:
557 add_path (xstrdup (arg), INC_AFTER, 0, true);
558 break;
559
560 case OPT_imacros:
561 case OPT_include:
562 defer_opt (code, arg);
563 break;
564
565 case OPT_imultilib:
566 imultilib = arg;
567 break;
568
569 case OPT_iprefix:
570 iprefix = arg;
571 break;
572
573 case OPT_iquote:
574 add_path (xstrdup (arg), INC_QUOTE, 0, true);
575 break;
576
577 case OPT_isysroot:
578 sysroot = arg;
579 break;
580
581 case OPT_isystem:
582 add_path (xstrdup (arg), INC_SYSTEM, 0, true);
583 break;
584
585 case OPT_iwithprefix:
586 add_prefixed_path (arg, INC_SYSTEM);
587 break;
588
589 case OPT_iwithprefixbefore:
590 add_prefixed_path (arg, INC_BRACKET);
591 break;
592
593 case OPT_lang_asm:
594 cpp_set_lang (parse_in, CLK_ASM);
595 cpp_opts->dollars_in_ident = false;
596 break;
597
598 case OPT_nostdinc:
599 std_inc = false;
600 break;
601
602 case OPT_nostdinc__:
603 std_cxx_inc = false;
604 break;
605
606 case OPT_o:
607 if (!out_fname)
608 out_fname = arg;
609 else
610 error ("output filename specified twice");
611 break;
612
613 case OPT_print_objc_runtime_info:
614 print_struct_values = 1;
615 break;
616
617 case OPT_remap:
618 cpp_opts->remap = 1;
619 break;
620
621 case OPT_std_c__98:
622 case OPT_std_gnu__98:
623 if (!preprocessing_asm_p)
624 set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
625 break;
626
627 case OPT_std_c__11:
628 case OPT_std_gnu__11:
629 if (!preprocessing_asm_p)
630 set_std_cxx11 (code == OPT_std_c__11 /* ISO */);
631 break;
632
633 case OPT_std_c__14:
634 case OPT_std_gnu__14:
635 if (!preprocessing_asm_p)
636 set_std_cxx14 (code == OPT_std_c__14 /* ISO */);
637 break;
638
639 case OPT_std_c__17:
640 case OPT_std_gnu__17:
641 if (!preprocessing_asm_p)
642 set_std_cxx17 (code == OPT_std_c__17 /* ISO */);
643 break;
644
645 case OPT_std_c__2a:
646 case OPT_std_gnu__2a:
647 if (!preprocessing_asm_p)
648 set_std_cxx2a (code == OPT_std_c__2a /* ISO */);
649 break;
650
651 case OPT_std_c90:
652 case OPT_std_iso9899_199409:
653 if (!preprocessing_asm_p)
654 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
655 break;
656
657 case OPT_std_gnu90:
658 if (!preprocessing_asm_p)
659 set_std_c89 (false /* c94 */, false /* ISO */);
660 break;
661
662 case OPT_std_c99:
663 if (!preprocessing_asm_p)
664 set_std_c99 (true /* ISO */);
665 break;
666
667 case OPT_std_gnu99:
668 if (!preprocessing_asm_p)
669 set_std_c99 (false /* ISO */);
670 break;
671
672 case OPT_std_c11:
673 if (!preprocessing_asm_p)
674 set_std_c11 (true /* ISO */);
675 break;
676
677 case OPT_std_gnu11:
678 if (!preprocessing_asm_p)
679 set_std_c11 (false /* ISO */);
680 break;
681
682 case OPT_std_c17:
683 if (!preprocessing_asm_p)
684 set_std_c17 (true /* ISO */);
685 break;
686
687 case OPT_std_gnu17:
688 if (!preprocessing_asm_p)
689 set_std_c17 (false /* ISO */);
690 break;
691
692 case OPT_trigraphs:
693 cpp_opts->trigraphs = 1;
694 break;
695
696 case OPT_traditional_cpp:
697 cpp_opts->traditional = 1;
698 break;
699
700 case OPT_v:
701 verbose = true;
702 break;
703 }
704
705 switch (c_language)
706 {
707 case clk_c:
708 C_handle_option_auto (&global_options, &global_options_set,
709 scode, arg, value,
710 c_family_lang_mask, kind,
711 loc, handlers, global_dc);
712 break;
713
714 case clk_objc:
715 ObjC_handle_option_auto (&global_options, &global_options_set,
716 scode, arg, value,
717 c_family_lang_mask, kind,
718 loc, handlers, global_dc);
719 break;
720
721 case clk_cxx:
722 CXX_handle_option_auto (&global_options, &global_options_set,
723 scode, arg, value,
724 c_family_lang_mask, kind,
725 loc, handlers, global_dc);
726 break;
727
728 case clk_objcxx:
729 ObjCXX_handle_option_auto (&global_options, &global_options_set,
730 scode, arg, value,
731 c_family_lang_mask, kind,
732 loc, handlers, global_dc);
733 break;
734
735 default:
736 gcc_unreachable ();
737 }
738
739 cpp_handle_option_auto (&global_options, scode, cpp_opts);
740 return result;
741 }
742
743 /* Default implementation of TARGET_HANDLE_C_OPTION. */
744
745 bool
default_handle_c_option(size_t code ATTRIBUTE_UNUSED,const char * arg ATTRIBUTE_UNUSED,int value ATTRIBUTE_UNUSED)746 default_handle_c_option (size_t code ATTRIBUTE_UNUSED,
747 const char *arg ATTRIBUTE_UNUSED,
748 int value ATTRIBUTE_UNUSED)
749 {
750 return false;
751 }
752
753 /* Post-switch processing. */
754 bool
c_common_post_options(const char ** pfilename)755 c_common_post_options (const char **pfilename)
756 {
757 struct cpp_callbacks *cb;
758
759 /* Canonicalize the input and output filenames. */
760 if (in_fnames == NULL)
761 {
762 in_fnames = XNEWVEC (const char *, 1);
763 in_fnames[0] = "";
764 }
765 else if (strcmp (in_fnames[0], "-") == 0)
766 {
767 if (pch_file)
768 error ("cannot use %<-%> as input filename for a precompiled header");
769
770 in_fnames[0] = "";
771 }
772
773 if (out_fname == NULL || !strcmp (out_fname, "-"))
774 out_fname = "";
775
776 if (cpp_opts->deps.style == DEPS_NONE)
777 check_deps_environment_vars ();
778
779 handle_deferred_opts ();
780
781 sanitize_cpp_opts ();
782
783 register_include_chains (parse_in, sysroot, iprefix, imultilib,
784 std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
785
786 #ifdef C_COMMON_OVERRIDE_OPTIONS
787 /* Some machines may reject certain combinations of C
788 language-specific options. */
789 C_COMMON_OVERRIDE_OPTIONS;
790 #endif
791
792 /* Excess precision other than "fast" requires front-end
793 support. */
794 if (c_dialect_cxx ())
795 {
796 if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD)
797 sorry ("-fexcess-precision=standard for C++");
798 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
799 }
800 else if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
801 flag_excess_precision_cmdline = (flag_iso
802 ? EXCESS_PRECISION_STANDARD
803 : EXCESS_PRECISION_FAST);
804
805 /* ISO C restricts floating-point expression contraction to within
806 source-language expressions (-ffp-contract=on, currently an alias
807 for -ffp-contract=off). */
808 if (flag_iso
809 && !c_dialect_cxx ()
810 && (global_options_set.x_flag_fp_contract_mode
811 == (enum fp_contract_mode) 0)
812 && flag_unsafe_math_optimizations == 0)
813 flag_fp_contract_mode = FP_CONTRACT_OFF;
814
815 /* If we are compiling C, and we are outside of a standards mode,
816 we can permit the new values from ISO/IEC TS 18661-3 for
817 FLT_EVAL_METHOD. Otherwise, we must restrict the possible values to
818 the set specified in ISO C99/C11. */
819 if (!flag_iso
820 && !c_dialect_cxx ()
821 && (global_options_set.x_flag_permitted_flt_eval_methods
822 == PERMITTED_FLT_EVAL_METHODS_DEFAULT))
823 flag_permitted_flt_eval_methods = PERMITTED_FLT_EVAL_METHODS_TS_18661;
824 else
825 flag_permitted_flt_eval_methods = PERMITTED_FLT_EVAL_METHODS_C11;
826
827 /* By default we use C99 inline semantics in GNU99 or C99 mode. C99
828 inline semantics are not supported in GNU89 or C89 mode. */
829 if (flag_gnu89_inline == -1)
830 flag_gnu89_inline = !flag_isoc99;
831 else if (!flag_gnu89_inline && !flag_isoc99)
832 error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
833
834 /* Default to ObjC sjlj exception handling if NeXT runtime. */
835 if (flag_objc_sjlj_exceptions < 0)
836 flag_objc_sjlj_exceptions = flag_next_runtime;
837 if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
838 flag_exceptions = 1;
839
840 /* If -ffreestanding, -fno-hosted or -fno-builtin then disable
841 pattern recognition. */
842 if (!global_options_set.x_flag_tree_loop_distribute_patterns
843 && flag_no_builtin)
844 flag_tree_loop_distribute_patterns = 0;
845
846 /* -Woverlength-strings is off by default, but is enabled by -Wpedantic.
847 It is never enabled in C++, as the minimum limit is not normative
848 in that standard. */
849 if (c_dialect_cxx ())
850 warn_overlength_strings = 0;
851
852 /* Wmain is enabled by default in C++ but not in C. */
853 /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
854 even if -Wall or -Wpedantic was given (warn_main will be 2 if set
855 by -Wall, 1 if set by -Wmain). */
856 if (warn_main == -1)
857 warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
858 else if (warn_main == 2)
859 warn_main = flag_hosted ? 1 : 0;
860
861 /* In C, -Wall and -Wc++-compat enable -Wenum-compare; if it has not
862 yet been set, it is disabled by default. In C++, it is enabled
863 by default. */
864 if (warn_enum_compare == -1)
865 warn_enum_compare = c_dialect_cxx () ? 1 : 0;
866
867 /* -Wpacked-bitfield-compat is on by default for the C languages. The
868 warning is issued in stor-layout.c which is not part of the front-end so
869 we need to selectively turn it on here. */
870 if (warn_packed_bitfield_compat == -1)
871 warn_packed_bitfield_compat = 1;
872
873 /* Special format checking options don't work without -Wformat; warn if
874 they are used. */
875 if (!warn_format)
876 {
877 warning (OPT_Wformat_y2k,
878 "-Wformat-y2k ignored without -Wformat");
879 warning (OPT_Wformat_extra_args,
880 "-Wformat-extra-args ignored without -Wformat");
881 warning (OPT_Wformat_zero_length,
882 "-Wformat-zero-length ignored without -Wformat");
883 warning (OPT_Wformat_nonliteral,
884 "-Wformat-nonliteral ignored without -Wformat");
885 warning (OPT_Wformat_contains_nul,
886 "-Wformat-contains-nul ignored without -Wformat");
887 warning (OPT_Wformat_security,
888 "-Wformat-security ignored without -Wformat");
889 }
890
891 /* -Wimplicit-function-declaration is enabled by default for C99. */
892 if (warn_implicit_function_declaration == -1)
893 warn_implicit_function_declaration = flag_isoc99;
894
895 /* -Wimplicit-int is enabled by default for C99. */
896 if (warn_implicit_int == -1)
897 warn_implicit_int = flag_isoc99;
898
899 /* -Wshift-overflow is enabled by default in C99 and C++11 modes. */
900 if (warn_shift_overflow == -1)
901 warn_shift_overflow = cxx_dialect >= cxx11 || flag_isoc99;
902
903 /* -Wshift-negative-value is enabled by -Wextra in C99 and C++11 modes. */
904 if (warn_shift_negative_value == -1)
905 warn_shift_negative_value = (extra_warnings
906 && (cxx_dialect >= cxx11 || flag_isoc99));
907
908 /* -Wregister is enabled by default in C++17. */
909 if (!global_options_set.x_warn_register)
910 warn_register = cxx_dialect >= cxx17;
911
912 /* Declone C++ 'structors if -Os. */
913 if (flag_declone_ctor_dtor == -1)
914 flag_declone_ctor_dtor = optimize_size;
915
916 if (flag_abi_compat_version == 1)
917 {
918 warning (0, "%<-fabi-compat-version=1%> is not supported, using =2");
919 flag_abi_compat_version = 2;
920 }
921
922 /* Change flag_abi_version to be the actual current ABI level, for the
923 benefit of c_cpp_builtins, and to make comparison simpler. */
924 const int latest_abi_version = 13;
925 /* Generate compatibility aliases for ABI v11 (7.1) by default. */
926 const int abi_compat_default = 11;
927
928 #define clamp(X) if (X == 0 || X > latest_abi_version) X = latest_abi_version
929 clamp (flag_abi_version);
930 clamp (warn_abi_version);
931 clamp (flag_abi_compat_version);
932 #undef clamp
933
934 /* Default -Wabi= or -fabi-compat-version= from each other. */
935 if (warn_abi_version == -1 && flag_abi_compat_version != -1)
936 warn_abi_version = flag_abi_compat_version;
937 else if (flag_abi_compat_version == -1 && warn_abi_version != -1)
938 flag_abi_compat_version = warn_abi_version;
939 else if (warn_abi_version == -1 && flag_abi_compat_version == -1)
940 {
941 warn_abi_version = latest_abi_version;
942 if (flag_abi_version == latest_abi_version)
943 {
944 if (warning (OPT_Wabi, "-Wabi won't warn about anything"))
945 {
946 inform (input_location, "-Wabi warns about differences "
947 "from the most up-to-date ABI, which is also used "
948 "by default");
949 inform (input_location, "use e.g. -Wabi=11 to warn about "
950 "changes from GCC 7");
951 }
952 flag_abi_compat_version = abi_compat_default;
953 }
954 else
955 flag_abi_compat_version = latest_abi_version;
956 }
957
958 /* By default, enable the new inheriting constructor semantics along with ABI
959 11. New and old should coexist fine, but it is a change in what
960 artificial symbols are generated. */
961 if (!global_options_set.x_flag_new_inheriting_ctors)
962 flag_new_inheriting_ctors = abi_version_at_least (11);
963
964 /* For GCC 7, only enable DR150 resolution by default if -std=c++17. */
965 if (!global_options_set.x_flag_new_ttp)
966 flag_new_ttp = (cxx_dialect >= cxx17);
967
968 if (cxx_dialect >= cxx11)
969 {
970 /* If we're allowing C++0x constructs, don't warn about C++98
971 identifiers which are keywords in C++0x. */
972 warn_cxx11_compat = 0;
973 cpp_opts->cpp_warn_cxx11_compat = 0;
974
975 if (warn_narrowing == -1)
976 warn_narrowing = 1;
977
978 /* Unless -f{,no-}ext-numeric-literals has been used explicitly,
979 for -std=c++{11,14,17,2a} default to -fno-ext-numeric-literals. */
980 if (flag_iso && !global_options_set.x_flag_ext_numeric_literals)
981 cpp_opts->ext_numeric_literals = 0;
982 }
983 else if (warn_narrowing == -1)
984 warn_narrowing = 0;
985
986 /* C++17 has stricter evaluation order requirements; let's use some of them
987 for earlier C++ as well, so chaining works as expected. */
988 if (c_dialect_cxx ()
989 && flag_strong_eval_order == -1)
990 flag_strong_eval_order = (cxx_dialect >= cxx17 ? 2 : 1);
991
992 /* Global sized deallocation is new in C++14. */
993 if (flag_sized_deallocation == -1)
994 flag_sized_deallocation = (cxx_dialect >= cxx14);
995
996 if (flag_extern_tls_init)
997 {
998 if (!TARGET_SUPPORTS_ALIASES || !SUPPORTS_WEAK)
999 {
1000 /* Lazy TLS initialization for a variable in another TU requires
1001 alias and weak reference support. */
1002 if (flag_extern_tls_init > 0)
1003 sorry ("external TLS initialization functions not supported "
1004 "on this target");
1005
1006 flag_extern_tls_init = 0;
1007 }
1008 else
1009 flag_extern_tls_init = 1;
1010 }
1011
1012 if (warn_return_type == -1)
1013 warn_return_type = c_dialect_cxx ();
1014
1015 if (num_in_fnames > 1)
1016 error ("too many filenames given. Type %s --help for usage",
1017 progname);
1018
1019 if (flag_preprocess_only)
1020 {
1021 /* Open the output now. We must do so even if flag_no_output is
1022 on, because there may be other output than from the actual
1023 preprocessing (e.g. from -dM). */
1024 if (out_fname[0] == '\0')
1025 out_stream = stdout;
1026 else
1027 out_stream = fopen (out_fname, "w");
1028
1029 if (out_stream == NULL)
1030 {
1031 fatal_error (input_location, "opening output file %s: %m", out_fname);
1032 return false;
1033 }
1034
1035 init_pp_output (out_stream);
1036 }
1037 else
1038 {
1039 init_c_lex ();
1040
1041 /* When writing a PCH file, avoid reading some other PCH file,
1042 because the default address space slot then can't be used
1043 for the output PCH file. */
1044 if (pch_file)
1045 {
1046 c_common_no_more_pch ();
1047 /* Only -g0 and -gdwarf* are supported with PCH, for other
1048 debug formats we warn here and refuse to load any PCH files. */
1049 if (write_symbols != NO_DEBUG && write_symbols != DWARF2_DEBUG)
1050 warning (OPT_Wdeprecated,
1051 "the \"%s\" debug format cannot be used with "
1052 "pre-compiled headers", debug_type_names[write_symbols]);
1053 }
1054 else if (write_symbols != NO_DEBUG && write_symbols != DWARF2_DEBUG)
1055 c_common_no_more_pch ();
1056
1057 /* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
1058 input_location = UNKNOWN_LOCATION;
1059 }
1060
1061 cb = cpp_get_callbacks (parse_in);
1062 cb->file_change = cb_file_change;
1063 cb->dir_change = cb_dir_change;
1064 cpp_post_options (parse_in);
1065 init_global_opts_from_cpp (&global_options, cpp_get_options (parse_in));
1066
1067 input_location = UNKNOWN_LOCATION;
1068
1069 *pfilename = this_input_filename
1070 = cpp_read_main_file (parse_in, in_fnames[0]);
1071 /* Don't do any compilation or preprocessing if there is no input file. */
1072 if (this_input_filename == NULL)
1073 {
1074 errorcount++;
1075 return false;
1076 }
1077
1078 if (flag_working_directory
1079 && flag_preprocess_only && !flag_no_line_commands)
1080 pp_dir_change (parse_in, get_src_pwd ());
1081
1082 /* Disable LTO output when outputting a precompiled header. */
1083 if (pch_file && flag_lto)
1084 {
1085 flag_lto = 0;
1086 flag_generate_lto = 0;
1087 }
1088
1089 return flag_preprocess_only;
1090 }
1091
1092 /* Front end initialization common to C, ObjC and C++. */
1093 bool
c_common_init(void)1094 c_common_init (void)
1095 {
1096 /* Set up preprocessor arithmetic. Must be done after call to
1097 c_common_nodes_and_builtins for type nodes to be good. */
1098 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1099 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1100 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1101 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1102 cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
1103 cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
1104
1105 /* This can't happen until after wchar_precision and bytes_big_endian
1106 are known. */
1107 cpp_init_iconv (parse_in);
1108
1109 if (version_flag)
1110 {
1111 int i;
1112 fputs ("Compiler executable checksum: ", stderr);
1113 for (i = 0; i < 16; i++)
1114 fprintf (stderr, "%02x", executable_checksum[i]);
1115 putc ('\n', stderr);
1116 }
1117
1118 /* Has to wait until now so that cpplib has its hash table. */
1119 init_pragma ();
1120
1121 if (flag_preprocess_only)
1122 {
1123 c_finish_options ();
1124 preprocess_file (parse_in);
1125 return false;
1126 }
1127
1128 return true;
1129 }
1130
1131 /* Initialize the integrated preprocessor after debug output has been
1132 initialized; loop over each input file. */
1133 void
c_common_parse_file(void)1134 c_common_parse_file (void)
1135 {
1136 unsigned int i;
1137
1138 i = 0;
1139 for (;;)
1140 {
1141 c_finish_options ();
1142 /* Open the dump file to use for the original dump output
1143 here, to be used during parsing for the current file. */
1144 original_dump_file = dump_begin (TDI_original, &original_dump_flags);
1145 pch_init ();
1146 push_file_scope ();
1147 c_parse_file ();
1148 pop_file_scope ();
1149 /* And end the main input file, if the debug writer wants it */
1150 if (debug_hooks->start_end_main_source_file)
1151 (*debug_hooks->end_source_file) (0);
1152 if (++i >= num_in_fnames)
1153 break;
1154 cpp_undef_all (parse_in);
1155 cpp_clear_file_cache (parse_in);
1156 this_input_filename
1157 = cpp_read_main_file (parse_in, in_fnames[i]);
1158 if (original_dump_file)
1159 {
1160 dump_end (TDI_original, original_dump_file);
1161 original_dump_file = NULL;
1162 }
1163 /* If an input file is missing, abandon further compilation.
1164 cpplib has issued a diagnostic. */
1165 if (!this_input_filename)
1166 break;
1167 }
1168
1169 c_parse_final_cleanups ();
1170 }
1171
1172 /* Returns the appropriate dump file for PHASE to dump with FLAGS. */
1173
1174 FILE *
get_dump_info(int phase,dump_flags_t * flags)1175 get_dump_info (int phase, dump_flags_t *flags)
1176 {
1177 gcc_assert (phase == TDI_original);
1178
1179 *flags = original_dump_flags;
1180 return original_dump_file;
1181 }
1182
1183 /* Common finish hook for the C, ObjC and C++ front ends. */
1184 void
c_common_finish(void)1185 c_common_finish (void)
1186 {
1187 FILE *deps_stream = NULL;
1188
1189 /* Note that we write the dependencies even if there are errors. This is
1190 useful for handling outdated generated headers that now trigger errors
1191 (for example, with #error) which would be resolved by re-generating
1192 them. In a sense, this complements -MG. */
1193 if (cpp_opts->deps.style != DEPS_NONE)
1194 {
1195 /* If -M or -MM was seen without -MF, default output to the
1196 output stream. */
1197 if (!deps_file)
1198 deps_stream = out_stream;
1199 else if (deps_file[0] == '-' && deps_file[1] == '\0')
1200 deps_stream = stdout;
1201 else
1202 {
1203 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1204 if (!deps_stream)
1205 fatal_error (input_location, "opening dependency file %s: %m",
1206 deps_file);
1207 }
1208 }
1209
1210 /* For performance, avoid tearing down cpplib's internal structures
1211 with cpp_destroy (). */
1212 cpp_finish (parse_in, deps_stream);
1213
1214 if (deps_stream && deps_stream != out_stream && deps_stream != stdout
1215 && (ferror (deps_stream) || fclose (deps_stream)))
1216 fatal_error (input_location, "closing dependency file %s: %m", deps_file);
1217
1218 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1219 fatal_error (input_location, "when writing output to %s: %m", out_fname);
1220 }
1221
1222 /* Either of two environment variables can specify output of
1223 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1224 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1225 and DEPS_TARGET is the target to mention in the deps. They also
1226 result in dependency information being appended to the output file
1227 rather than overwriting it, and like Sun's compiler
1228 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1229 static void
check_deps_environment_vars(void)1230 check_deps_environment_vars (void)
1231 {
1232 char *spec;
1233
1234 spec = getenv ("DEPENDENCIES_OUTPUT");
1235 if (spec)
1236 cpp_opts->deps.style = DEPS_USER;
1237 else
1238 {
1239 spec = getenv ("SUNPRO_DEPENDENCIES");
1240 if (spec)
1241 {
1242 cpp_opts->deps.style = DEPS_SYSTEM;
1243 cpp_opts->deps.ignore_main_file = true;
1244 }
1245 }
1246
1247 if (spec)
1248 {
1249 /* Find the space before the DEPS_TARGET, if there is one. */
1250 char *s = strchr (spec, ' ');
1251 if (s)
1252 {
1253 /* Let the caller perform MAKE quoting. */
1254 defer_opt (OPT_MT, s + 1);
1255 *s = '\0';
1256 }
1257
1258 /* Command line -MF overrides environment variables and default. */
1259 if (!deps_file)
1260 deps_file = spec;
1261
1262 deps_append = 1;
1263 deps_seen = true;
1264 }
1265 }
1266
1267 /* Handle deferred command line switches. */
1268 static void
handle_deferred_opts(void)1269 handle_deferred_opts (void)
1270 {
1271 size_t i;
1272 struct deps *deps;
1273
1274 /* Avoid allocating the deps buffer if we don't need it.
1275 (This flag may be true without there having been -MT or -MQ
1276 options, but we'll still need the deps buffer.) */
1277 if (!deps_seen)
1278 return;
1279
1280 deps = cpp_get_deps (parse_in);
1281
1282 for (i = 0; i < deferred_count; i++)
1283 {
1284 struct deferred_opt *opt = &deferred_opts[i];
1285
1286 if (opt->code == OPT_MT || opt->code == OPT_MQ)
1287 deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
1288 }
1289 }
1290
1291 /* These settings are appropriate for GCC, but not necessarily so for
1292 cpplib as a library. */
1293 static void
sanitize_cpp_opts(void)1294 sanitize_cpp_opts (void)
1295 {
1296 /* If we don't know what style of dependencies to output, complain
1297 if any other dependency switches have been given. */
1298 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1299 error ("to generate dependencies you must specify either -M or -MM");
1300
1301 /* -dM and dependencies suppress normal output; do it here so that
1302 the last -d[MDN] switch overrides earlier ones. */
1303 if (flag_dump_macros == 'M')
1304 flag_no_output = 1;
1305
1306 /* By default, -fdirectives-only implies -dD. This allows subsequent phases
1307 to perform proper macro expansion. */
1308 if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
1309 flag_dump_macros = 'D';
1310
1311 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1312 -dM since at least glibc relies on -M -dM to work. */
1313 /* Also, flag_no_output implies flag_no_line_commands, always. */
1314 if (flag_no_output)
1315 {
1316 if (flag_dump_macros != 'M')
1317 flag_dump_macros = 0;
1318 flag_dump_includes = 0;
1319 flag_no_line_commands = 1;
1320 }
1321 else if (cpp_opts->deps.missing_files)
1322 error ("-MG may only be used with -M or -MM");
1323
1324 cpp_opts->unsigned_char = !flag_signed_char;
1325 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1326
1327 /* Wlong-long is disabled by default. It is enabled by:
1328 [-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or
1329 [-Wpedantic | -Wtraditional] -std=non-c99
1330
1331 Either -Wlong-long or -Wno-long-long override any other settings.
1332 ??? These conditions should be handled in c.opt. */
1333 if (warn_long_long == -1)
1334 {
1335 warn_long_long = ((pedantic || warn_traditional)
1336 && (c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99));
1337 cpp_opts->cpp_warn_long_long = warn_long_long;
1338 }
1339
1340 /* If we're generating preprocessor output, emit current directory
1341 if explicitly requested or if debugging information is enabled.
1342 ??? Maybe we should only do it for debugging formats that
1343 actually output the current directory? */
1344 if (flag_working_directory == -1)
1345 flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
1346
1347 if (warn_implicit_fallthrough < 5)
1348 cpp_opts->cpp_warn_implicit_fallthrough = warn_implicit_fallthrough;
1349 else
1350 cpp_opts->cpp_warn_implicit_fallthrough = 0;
1351
1352 if (cpp_opts->directives_only)
1353 {
1354 if (cpp_warn_unused_macros)
1355 error ("-fdirectives-only is incompatible with -Wunused_macros");
1356 if (cpp_opts->traditional)
1357 error ("-fdirectives-only is incompatible with -traditional");
1358 }
1359 }
1360
1361 /* Add include path with a prefix at the front of its name. */
1362 static void
add_prefixed_path(const char * suffix,incpath_kind chain)1363 add_prefixed_path (const char *suffix, incpath_kind chain)
1364 {
1365 char *path;
1366 const char *prefix;
1367 size_t prefix_len, suffix_len;
1368
1369 suffix_len = strlen (suffix);
1370 prefix = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
1371 prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
1372
1373 path = (char *) xmalloc (prefix_len + suffix_len + 1);
1374 memcpy (path, prefix, prefix_len);
1375 memcpy (path + prefix_len, suffix, suffix_len);
1376 path[prefix_len + suffix_len] = '\0';
1377
1378 add_path (path, chain, 0, false);
1379 }
1380
1381 /* Handle -D, -U, -A, -imacros, and the first -include. */
1382 static void
c_finish_options(void)1383 c_finish_options (void)
1384 {
1385 if (!cpp_opts->preprocessed)
1386 {
1387 size_t i;
1388
1389 cb_file_change (parse_in,
1390 linemap_check_ordinary (linemap_add (line_table,
1391 LC_RENAME, 0,
1392 _("<built-in>"),
1393 0)));
1394 /* Make sure all of the builtins about to be declared have
1395 BUILTINS_LOCATION has their source_location. */
1396 source_location builtins_loc = BUILTINS_LOCATION;
1397 cpp_force_token_locations (parse_in, &builtins_loc);
1398
1399 cpp_init_builtins (parse_in, flag_hosted);
1400 c_cpp_builtins (parse_in);
1401
1402 cpp_stop_forcing_token_locations (parse_in);
1403
1404 /* We're about to send user input to cpplib, so make it warn for
1405 things that we previously (when we sent it internal definitions)
1406 told it to not warn.
1407
1408 C99 permits implementation-defined characters in identifiers.
1409 The documented meaning of -std= is to turn off extensions that
1410 conflict with the specified standard, and since a strictly
1411 conforming program cannot contain a '$', we do not condition
1412 their acceptance on the -std= setting. */
1413 cpp_opts->warn_dollars = (cpp_opts->cpp_pedantic && !cpp_opts->c99);
1414
1415 cb_file_change (parse_in,
1416 linemap_check_ordinary (linemap_add (line_table, LC_RENAME, 0,
1417 _("<command-line>"), 0)));
1418
1419 for (i = 0; i < deferred_count; i++)
1420 {
1421 struct deferred_opt *opt = &deferred_opts[i];
1422
1423 if (opt->code == OPT_D)
1424 cpp_define (parse_in, opt->arg);
1425 else if (opt->code == OPT_U)
1426 cpp_undef (parse_in, opt->arg);
1427 else if (opt->code == OPT_A)
1428 {
1429 if (opt->arg[0] == '-')
1430 cpp_unassert (parse_in, opt->arg + 1);
1431 else
1432 cpp_assert (parse_in, opt->arg);
1433 }
1434 }
1435
1436 /* Start the main input file, if the debug writer wants it. */
1437 if (debug_hooks->start_end_main_source_file
1438 && !flag_preprocess_only)
1439 (*debug_hooks->start_source_file) (0, this_input_filename);
1440
1441 /* Handle -imacros after -D and -U. */
1442 for (i = 0; i < deferred_count; i++)
1443 {
1444 struct deferred_opt *opt = &deferred_opts[i];
1445
1446 if (opt->code == OPT_imacros
1447 && cpp_push_include (parse_in, opt->arg))
1448 {
1449 /* Disable push_command_line_include callback for now. */
1450 include_cursor = deferred_count + 1;
1451 cpp_scan_nooutput (parse_in);
1452 }
1453 }
1454 }
1455 else
1456 {
1457 if (cpp_opts->directives_only)
1458 cpp_init_special_builtins (parse_in);
1459
1460 /* Start the main input file, if the debug writer wants it. */
1461 if (debug_hooks->start_end_main_source_file
1462 && !flag_preprocess_only)
1463 (*debug_hooks->start_source_file) (0, this_input_filename);
1464 }
1465
1466 include_cursor = 0;
1467 push_command_line_include ();
1468 }
1469
1470 /* Give CPP the next file given by -include, if any. */
1471 static void
push_command_line_include(void)1472 push_command_line_include (void)
1473 {
1474 /* This can happen if disabled by -imacros for example.
1475 Punt so that we don't set "<command-line>" as the filename for
1476 the header. */
1477 if (include_cursor > deferred_count)
1478 return;
1479
1480 if (!done_preinclude)
1481 {
1482 done_preinclude = true;
1483 if (flag_hosted && std_inc && !cpp_opts->preprocessed)
1484 {
1485 const char *preinc = targetcm.c_preinclude ();
1486 if (preinc && cpp_push_default_include (parse_in, preinc))
1487 return;
1488 }
1489 }
1490
1491 pch_cpp_save_state ();
1492
1493 while (include_cursor < deferred_count)
1494 {
1495 struct deferred_opt *opt = &deferred_opts[include_cursor++];
1496
1497 if (!cpp_opts->preprocessed && opt->code == OPT_include
1498 && cpp_push_include (parse_in, opt->arg))
1499 return;
1500 }
1501
1502 if (include_cursor == deferred_count)
1503 {
1504 include_cursor++;
1505 /* -Wunused-macros should only warn about macros defined hereafter. */
1506 cpp_opts->warn_unused_macros = cpp_warn_unused_macros;
1507 /* Restore the line map from <command line>. */
1508 if (!cpp_opts->preprocessed)
1509 cpp_change_file (parse_in, LC_RENAME, this_input_filename);
1510
1511 /* Set this here so the client can change the option if it wishes,
1512 and after stacking the main file so we don't trace the main file. */
1513 line_table->trace_includes = cpp_opts->print_include_names;
1514 }
1515 }
1516
1517 /* File change callback. Has to handle -include files. */
1518 static void
cb_file_change(cpp_reader * ARG_UNUSED (pfile),const line_map_ordinary * new_map)1519 cb_file_change (cpp_reader * ARG_UNUSED (pfile),
1520 const line_map_ordinary *new_map)
1521 {
1522 if (flag_preprocess_only)
1523 pp_file_change (new_map);
1524 else
1525 fe_file_change (new_map);
1526
1527 if (new_map
1528 && (new_map->reason == LC_ENTER || new_map->reason == LC_RENAME))
1529 {
1530 /* Signal to plugins that a file is included. This could happen
1531 several times with the same file path, e.g. because of
1532 several '#include' or '#line' directives... */
1533 invoke_plugin_callbacks
1534 (PLUGIN_INCLUDE_FILE,
1535 const_cast<char*> (ORDINARY_MAP_FILE_NAME (new_map)));
1536 }
1537
1538 if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
1539 {
1540 pch_cpp_save_state ();
1541 push_command_line_include ();
1542 }
1543 }
1544
1545 void
cb_dir_change(cpp_reader * ARG_UNUSED (pfile),const char * dir)1546 cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
1547 {
1548 if (!set_src_pwd (dir))
1549 warning (0, "too late for # directive to set debug directory");
1550 }
1551
1552 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1553 extensions if ISO). There is no concept of gnu94. */
1554 static void
set_std_c89(int c94,int iso)1555 set_std_c89 (int c94, int iso)
1556 {
1557 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1558 flag_iso = iso;
1559 flag_no_asm = iso;
1560 flag_no_gnu_keywords = iso;
1561 flag_no_nonansi_builtin = iso;
1562 flag_isoc94 = c94;
1563 flag_isoc99 = 0;
1564 flag_isoc11 = 0;
1565 lang_hooks.name = "GNU C89";
1566 }
1567
1568 /* Set the C 99 standard (without GNU extensions if ISO). */
1569 static void
set_std_c99(int iso)1570 set_std_c99 (int iso)
1571 {
1572 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1573 flag_no_asm = iso;
1574 flag_no_nonansi_builtin = iso;
1575 flag_iso = iso;
1576 flag_isoc11 = 0;
1577 flag_isoc99 = 1;
1578 flag_isoc94 = 1;
1579 lang_hooks.name = "GNU C99";
1580 }
1581
1582 /* Set the C 11 standard (without GNU extensions if ISO). */
1583 static void
set_std_c11(int iso)1584 set_std_c11 (int iso)
1585 {
1586 cpp_set_lang (parse_in, iso ? CLK_STDC11: CLK_GNUC11);
1587 flag_no_asm = iso;
1588 flag_no_nonansi_builtin = iso;
1589 flag_iso = iso;
1590 flag_isoc11 = 1;
1591 flag_isoc99 = 1;
1592 flag_isoc94 = 1;
1593 lang_hooks.name = "GNU C11";
1594 }
1595
1596 /* Set the C 17 standard (without GNU extensions if ISO). */
1597 static void
set_std_c17(int iso)1598 set_std_c17 (int iso)
1599 {
1600 cpp_set_lang (parse_in, iso ? CLK_STDC17: CLK_GNUC17);
1601 flag_no_asm = iso;
1602 flag_no_nonansi_builtin = iso;
1603 flag_iso = iso;
1604 flag_isoc11 = 1;
1605 flag_isoc99 = 1;
1606 flag_isoc94 = 1;
1607 lang_hooks.name = "GNU C17";
1608 }
1609
1610
1611 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1612 static void
set_std_cxx98(int iso)1613 set_std_cxx98 (int iso)
1614 {
1615 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1616 flag_no_gnu_keywords = iso;
1617 flag_no_nonansi_builtin = iso;
1618 flag_iso = iso;
1619 flag_isoc94 = 0;
1620 flag_isoc99 = 0;
1621 cxx_dialect = cxx98;
1622 lang_hooks.name = "GNU C++98";
1623 }
1624
1625 /* Set the C++ 2011 standard (without GNU extensions if ISO). */
1626 static void
set_std_cxx11(int iso)1627 set_std_cxx11 (int iso)
1628 {
1629 cpp_set_lang (parse_in, iso ? CLK_CXX11: CLK_GNUCXX11);
1630 flag_no_gnu_keywords = iso;
1631 flag_no_nonansi_builtin = iso;
1632 flag_iso = iso;
1633 /* C++11 includes the C99 standard library. */
1634 flag_isoc94 = 1;
1635 flag_isoc99 = 1;
1636 cxx_dialect = cxx11;
1637 lang_hooks.name = "GNU C++11";
1638 }
1639
1640 /* Set the C++ 2014 standard (without GNU extensions if ISO). */
1641 static void
set_std_cxx14(int iso)1642 set_std_cxx14 (int iso)
1643 {
1644 cpp_set_lang (parse_in, iso ? CLK_CXX14: CLK_GNUCXX14);
1645 flag_no_gnu_keywords = iso;
1646 flag_no_nonansi_builtin = iso;
1647 flag_iso = iso;
1648 /* C++14 includes the C99 standard library. */
1649 flag_isoc94 = 1;
1650 flag_isoc99 = 1;
1651 cxx_dialect = cxx14;
1652 lang_hooks.name = "GNU C++14";
1653 }
1654
1655 /* Set the C++ 2017 standard (without GNU extensions if ISO). */
1656 static void
set_std_cxx17(int iso)1657 set_std_cxx17 (int iso)
1658 {
1659 cpp_set_lang (parse_in, iso ? CLK_CXX17: CLK_GNUCXX17);
1660 flag_no_gnu_keywords = iso;
1661 flag_no_nonansi_builtin = iso;
1662 flag_iso = iso;
1663 /* C++17 includes the C11 standard library. */
1664 flag_isoc94 = 1;
1665 flag_isoc99 = 1;
1666 flag_isoc11 = 1;
1667 cxx_dialect = cxx17;
1668 lang_hooks.name = "GNU C++17";
1669 }
1670
1671 /* Set the C++ 202a draft standard (without GNU extensions if ISO). */
1672 static void
set_std_cxx2a(int iso)1673 set_std_cxx2a (int iso)
1674 {
1675 cpp_set_lang (parse_in, iso ? CLK_CXX2A: CLK_GNUCXX2A);
1676 flag_no_gnu_keywords = iso;
1677 flag_no_nonansi_builtin = iso;
1678 flag_iso = iso;
1679 /* C++17 includes the C11 standard library. */
1680 flag_isoc94 = 1;
1681 flag_isoc99 = 1;
1682 flag_isoc11 = 1;
1683 cxx_dialect = cxx2a;
1684 lang_hooks.name = "GNU C++17"; /* Pretend C++17 until standardization. */
1685 }
1686
1687 /* Args to -d specify what to dump. Silently ignore
1688 unrecognized options; they may be aimed at toplev.c. */
1689 static void
handle_OPT_d(const char * arg)1690 handle_OPT_d (const char *arg)
1691 {
1692 char c;
1693
1694 while ((c = *arg++) != '\0')
1695 switch (c)
1696 {
1697 case 'M': /* Dump macros only. */
1698 case 'N': /* Dump names. */
1699 case 'D': /* Dump definitions. */
1700 case 'U': /* Dump used macros. */
1701 flag_dump_macros = c;
1702 break;
1703
1704 case 'I':
1705 flag_dump_includes = 1;
1706 break;
1707 }
1708 }
1709