2010-07-27 Paolo Carlini <paolo.carlini@oracle.com>
[official-gcc/alias-decl.git] / gcc / opts.c
blob12eb40a451a4855c2c19d1c2a0a40783f31b1b09
1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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
11 version.
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
16 for more details.
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/>. */
22 #include "config.h"
23 #include "system.h"
24 #include "intl.h"
25 #include "coretypes.h"
26 #include "tm.h"
27 #include "tree.h"
28 #include "rtl.h"
29 #include "expr.h"
30 #include "ggc.h"
31 #include "output.h"
32 #include "langhooks.h"
33 #include "opts.h"
34 #include "options.h"
35 #include "flags.h"
36 #include "toplev.h"
37 #include "params.h"
38 #include "diagnostic.h"
39 #include "opts-diagnostic.h"
40 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
41 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "target.h"
43 #include "tree-pass.h"
44 #include "dbgcnt.h"
45 #include "debug.h"
46 #include "plugin.h"
47 #include "except.h"
48 #include "lto-streamer.h"
50 /* Value of the -G xx switch, and whether it was passed or not. */
51 unsigned HOST_WIDE_INT g_switch_value;
52 bool g_switch_set;
54 /* Same for selective scheduling. */
55 bool sel_sched_switch_set;
57 /* True if we should exit after parsing options. */
58 bool exit_after_options;
60 /* True to warn about any objects definitions whose size is larger
61 than N bytes. Also want about function definitions whose returned
62 values are larger than N bytes, where N is `larger_than_size'. */
63 bool warn_larger_than;
64 HOST_WIDE_INT larger_than_size;
66 /* True to warn about any function whose frame size is larger
67 than N bytes. */
68 bool warn_frame_larger_than;
69 HOST_WIDE_INT frame_larger_than_size;
71 /* Type(s) of debugging information we are producing (if any). See
72 flags.h for the definitions of the different possible types of
73 debugging information. */
74 enum debug_info_type write_symbols = NO_DEBUG;
76 /* Level of debugging information we are producing. See flags.h for
77 the definitions of the different possible levels. */
78 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
80 /* A major contribution to object and executable size is debug
81 information size. A major contribution to debug information size
82 is struct descriptions replicated in several object files. The
83 following flags attempt to reduce this information. The basic
84 idea is to not emit struct debugging information in the current
85 compilation unit when that information will be generated by
86 another compilation unit.
88 Debug information for a struct defined in the current source
89 file should be generated in the object file. Likewise the
90 debug information for a struct defined in a header should be
91 generated in the object file of the corresponding source file.
92 Both of these case are handled when the base name of the file of
93 the struct definition matches the base name of the source file
94 of the current compilation unit. This matching emits minimal
95 struct debugging information.
97 The base file name matching rule above will fail to emit debug
98 information for structs defined in system headers. So a second
99 category of files includes system headers in addition to files
100 with matching bases.
102 The remaining types of files are library headers and application
103 headers. We cannot currently distinguish these two types. */
105 enum debug_struct_file
107 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
108 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
109 same base name as the compilation unit. */
110 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
111 header files. */
112 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
115 /* Generic structs (e.g. templates not explicitly specialized)
116 may not have a compilation unit associated with them, and so
117 may need to be treated differently from ordinary structs.
119 Structs only handled by reference (indirectly), will also usually
120 not need as much debugging information. */
122 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
123 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
124 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
125 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
127 /* Parse the -femit-struct-debug-detailed option value
128 and set the flag variables. */
130 #define MATCH( prefix, string ) \
131 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
132 ? ((string += sizeof prefix - 1), 1) : 0)
134 void
135 set_struct_debug_option (const char *spec)
137 /* various labels for comparison */
138 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
139 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
140 static char none_lbl[] = "none", any_lbl[] = "any";
141 static char base_lbl[] = "base", sys_lbl[] = "sys";
143 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
144 /* Default is to apply to as much as possible. */
145 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
146 int ord = 1, gen = 1;
148 /* What usage? */
149 if (MATCH (dfn_lbl, spec))
150 usage = DINFO_USAGE_DFN;
151 else if (MATCH (dir_lbl, spec))
152 usage = DINFO_USAGE_DIR_USE;
153 else if (MATCH (ind_lbl, spec))
154 usage = DINFO_USAGE_IND_USE;
156 /* Generics or not? */
157 if (MATCH (ord_lbl, spec))
158 gen = 0;
159 else if (MATCH (gen_lbl, spec))
160 ord = 0;
162 /* What allowable environment? */
163 if (MATCH (none_lbl, spec))
164 files = DINFO_STRUCT_FILE_NONE;
165 else if (MATCH (any_lbl, spec))
166 files = DINFO_STRUCT_FILE_ANY;
167 else if (MATCH (sys_lbl, spec))
168 files = DINFO_STRUCT_FILE_SYS;
169 else if (MATCH (base_lbl, spec))
170 files = DINFO_STRUCT_FILE_BASE;
171 else
172 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
173 spec);
175 /* Effect the specification. */
176 if (usage == DINFO_USAGE_NUM_ENUMS)
178 if (ord)
180 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
181 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
182 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
184 if (gen)
186 debug_struct_generic[DINFO_USAGE_DFN] = files;
187 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
188 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
191 else
193 if (ord)
194 debug_struct_ordinary[usage] = files;
195 if (gen)
196 debug_struct_generic[usage] = files;
199 if (*spec == ',')
200 set_struct_debug_option (spec+1);
201 else
203 /* No more -femit-struct-debug-detailed specifications.
204 Do final checks. */
205 if (*spec != '\0')
206 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
207 spec);
208 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
209 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
210 || debug_struct_generic[DINFO_USAGE_DIR_USE]
211 < debug_struct_generic[DINFO_USAGE_IND_USE])
212 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
213 " as much as %<-femit-struct-debug-detailed=ind:...%>");
217 /* Find the base name of a path, stripping off both directories and
218 a single final extension. */
219 static int
220 base_of_path (const char *path, const char **base_out)
222 const char *base = path;
223 const char *dot = 0;
224 const char *p = path;
225 char c = *p;
226 while (c)
228 if (IS_DIR_SEPARATOR(c))
230 base = p + 1;
231 dot = 0;
233 else if (c == '.')
234 dot = p;
235 c = *++p;
237 if (!dot)
238 dot = p;
239 *base_out = base;
240 return dot - base;
243 /* Match the base name of a file to the base name of a compilation unit. */
245 static const char *main_input_basename;
246 static int main_input_baselength;
248 static int
249 matches_main_base (const char *path)
251 /* Cache the last query. */
252 static const char *last_path = NULL;
253 static int last_match = 0;
254 if (path != last_path)
256 const char *base;
257 int length = base_of_path (path, &base);
258 last_path = path;
259 last_match = (length == main_input_baselength
260 && memcmp (base, main_input_basename, length) == 0);
262 return last_match;
265 #ifdef DEBUG_DEBUG_STRUCT
267 static int
268 dump_struct_debug (tree type, enum debug_info_usage usage,
269 enum debug_struct_file criterion, int generic,
270 int matches, int result)
272 /* Find the type name. */
273 tree type_decl = TYPE_STUB_DECL (type);
274 tree t = type_decl;
275 const char *name = 0;
276 if (TREE_CODE (t) == TYPE_DECL)
277 t = DECL_NAME (t);
278 if (t)
279 name = IDENTIFIER_POINTER (t);
281 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
282 criterion,
283 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
284 matches ? "bas" : "hdr",
285 generic ? "gen" : "ord",
286 usage == DINFO_USAGE_DFN ? ";" :
287 usage == DINFO_USAGE_DIR_USE ? "." : "*",
288 result,
289 (void*) type_decl, name);
290 return result;
292 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
293 dump_struct_debug (type, usage, criterion, generic, matches, result)
295 #else
297 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
298 (result)
300 #endif
303 bool
304 should_emit_struct_debug (tree type, enum debug_info_usage usage)
306 enum debug_struct_file criterion;
307 tree type_decl;
308 bool generic = lang_hooks.types.generic_p (type);
310 if (generic)
311 criterion = debug_struct_generic[usage];
312 else
313 criterion = debug_struct_ordinary[usage];
315 if (criterion == DINFO_STRUCT_FILE_NONE)
316 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
317 if (criterion == DINFO_STRUCT_FILE_ANY)
318 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
320 type_decl = TYPE_STUB_DECL (type);
322 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
323 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
325 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
326 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
327 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
330 /* Nonzero means use GNU-only extensions in the generated symbolic
331 debugging information. Currently, this only has an effect when
332 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
333 bool use_gnu_debug_info_extensions;
335 /* The default visibility for all symbols (unless overridden) */
336 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
338 /* Global visibility options. */
339 struct visibility_flags visibility_options;
341 /* What to print when a switch has no documentation. */
342 static const char undocumented_msg[] = N_("This switch lacks documentation");
344 /* Used for bookkeeping on whether user set these flags so
345 -fprofile-use/-fprofile-generate does not use them. */
346 static bool profile_arc_flag_set, flag_profile_values_set;
347 static bool flag_unroll_loops_set, flag_tracer_set;
348 static bool flag_value_profile_transformations_set;
349 static bool flag_peel_loops_set, flag_branch_probabilities_set;
350 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
351 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
353 /* Functions excluded from profiling. */
355 typedef char *char_p; /* For DEF_VEC_P. */
356 DEF_VEC_P(char_p);
357 DEF_VEC_ALLOC_P(char_p,heap);
359 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
360 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
362 typedef const char *const_char_p; /* For DEF_VEC_P. */
363 DEF_VEC_P(const_char_p);
364 DEF_VEC_ALLOC_P(const_char_p,heap);
366 static VEC(const_char_p,heap) *ignored_options;
368 /* Language specific warning pass for unused results. */
369 bool flag_warn_unused_result = false;
371 /* Input file names. */
372 const char **in_fnames;
373 unsigned num_in_fnames;
375 static int common_handle_option (size_t scode, const char *arg, int value,
376 unsigned int lang_mask, int kind);
377 static void handle_param (const char *);
378 static char *write_langs (unsigned int lang_mask);
379 static void complain_wrong_lang (const char *, const struct cl_option *,
380 unsigned int lang_mask);
381 static void set_debug_level (enum debug_info_type type, int extended,
382 const char *arg);
384 /* Return a malloced slash-separated list of languages in MASK. */
385 static char *
386 write_langs (unsigned int mask)
388 unsigned int n = 0, len = 0;
389 const char *lang_name;
390 char *result;
392 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
393 if (mask & (1U << n))
394 len += strlen (lang_name) + 1;
396 result = XNEWVEC (char, len);
397 len = 0;
398 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
399 if (mask & (1U << n))
401 if (len)
402 result[len++] = '/';
403 strcpy (result + len, lang_name);
404 len += strlen (lang_name);
407 result[len] = 0;
409 return result;
412 /* Complain that switch OPT_INDEX does not apply to this front end. */
413 static void
414 complain_wrong_lang (const char *text, const struct cl_option *option,
415 unsigned int lang_mask)
417 char *ok_langs, *bad_lang;
419 if (!lang_hooks.complain_wrong_lang_p (option))
420 return;
422 ok_langs = write_langs (option->flags);
423 bad_lang = write_langs (lang_mask);
425 /* Eventually this should become a hard error IMO. */
426 warning (0, "command line option \"%s\" is valid for %s but not for %s",
427 text, ok_langs, bad_lang);
429 free (ok_langs);
430 free (bad_lang);
433 /* Buffer the unknown option described by the string OPT. Currently,
434 we only complain about unknown -Wno-* options if they may have
435 prevented a diagnostic. Otherwise, we just ignore them.
436 Note that if we do complain, it is only as a warning, not an error;
437 passing the compiler an unrecognised -Wno-* option should never
438 change whether the compilation succeeds or fails. */
440 static void postpone_unknown_option_warning(const char *opt)
442 VEC_safe_push (const_char_p, heap, ignored_options, opt);
445 /* Produce a warning for each option previously buffered. */
447 void print_ignored_options (void)
449 location_t saved_loc = input_location;
451 input_location = 0;
453 while (!VEC_empty (const_char_p, ignored_options))
455 const char *opt;
456 opt = VEC_pop (const_char_p, ignored_options);
457 warning (0, "unrecognized command line option \"%s\"", opt);
460 input_location = saved_loc;
464 /* Handle option OPT_INDEX, and argument ARG, for the language
465 indicated by LANG_MASK. VALUE is true, unless no- form of an -f or
466 -W option was given. KIND is the diagnostic_t if this is a
467 diagnostics option, DK_UNSPECIFIED otherwise. Returns false if the
468 switch was invalid. */
469 bool
470 handle_option (int opt_index, int value, const char *arg,
471 unsigned int lang_mask, int kind)
473 const struct cl_option *option = &cl_options[opt_index];
475 if (option->flag_var)
476 set_option (opt_index, value, arg, kind);
478 if (option->flags & lang_mask)
480 if (lang_hooks.handle_option (opt_index, arg, value, kind) == 0)
481 return false;
482 #ifdef ENABLE_LTO
483 else
484 lto_register_user_option (opt_index, arg, value, lang_mask);
485 #endif
488 if (option->flags & CL_COMMON)
490 if (common_handle_option (opt_index, arg, value, lang_mask, kind) == 0)
491 return false;
492 #ifdef ENABLE_LTO
493 else
494 lto_register_user_option (opt_index, arg, value, CL_COMMON);
495 #endif
498 if (option->flags & CL_TARGET)
500 if (!targetm.handle_option (opt_index, arg, value))
501 return false;
502 #ifdef ENABLE_LTO
503 else
504 lto_register_user_option (opt_index, arg, value, CL_TARGET);
505 #endif
507 return true;
510 /* Handle the switch DECODED for the language indicated by
511 LANG_MASK. */
512 static void
513 read_cmdline_option (struct cl_decoded_option *decoded,
514 unsigned int lang_mask)
516 const struct cl_option *option;
517 const char *opt;
519 if (decoded->opt_index == OPT_SPECIAL_unknown)
521 opt = decoded->arg;
523 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
524 /* We don't generate warnings for unknown -Wno-* options
525 unless we issue diagnostics. */
526 postpone_unknown_option_warning (opt);
527 else
528 error ("unrecognized command line option %qs", opt);
529 return;
532 option = &cl_options[decoded->opt_index];
533 opt = decoded->orig_option_with_args_text;
535 if (decoded->errors & CL_ERR_DISABLED)
537 error ("command line option %qs"
538 " is not supported by this configuration", opt);
539 return;
542 if (decoded->errors & CL_ERR_WRONG_LANG)
544 complain_wrong_lang (opt, option, lang_mask);
545 return;
548 if (decoded->errors & CL_ERR_MISSING_ARG)
550 if (option->missing_argument_error)
551 error (option->missing_argument_error, opt);
552 else
553 error ("missing argument to %qs", opt);
554 return;
557 if (decoded->errors & CL_ERR_UINT_ARG)
559 error ("argument to %qs should be a non-negative integer",
560 option->opt_text);
561 return;
564 gcc_assert (!decoded->errors);
566 if (!handle_option (decoded->opt_index, decoded->value, decoded->arg,
567 lang_mask, DK_UNSPECIFIED))
568 error ("unrecognized command line option %qs", opt);
571 /* Handle FILENAME from the command line. */
572 static void
573 add_input_filename (const char *filename)
575 num_in_fnames++;
576 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
577 in_fnames[num_in_fnames - 1] = filename;
580 /* Add comma-separated strings to a char_p vector. */
582 static void
583 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
585 char *tmp;
586 char *r;
587 char *w;
588 char *token_start;
590 /* We never free this string. */
591 tmp = xstrdup (arg);
593 r = tmp;
594 w = tmp;
595 token_start = tmp;
597 while (*r != '\0')
599 if (*r == ',')
601 *w++ = '\0';
602 ++r;
603 VEC_safe_push (char_p, heap, *pvec, token_start);
604 token_start = w;
606 if (*r == '\\' && r[1] == ',')
608 *w++ = ',';
609 r += 2;
611 else
612 *w++ = *r++;
614 if (*token_start != '\0')
615 VEC_safe_push (char_p, heap, *pvec, token_start);
618 /* Return whether we should exclude FNDECL from instrumentation. */
620 bool
621 flag_instrument_functions_exclude_p (tree fndecl)
623 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
625 const char *name;
626 int i;
627 char *s;
629 name = lang_hooks.decl_printable_name (fndecl, 0);
630 for (i = 0;
631 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
632 i, s);
633 ++i)
635 if (strstr (name, s) != NULL)
636 return true;
640 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
642 const char *name;
643 int i;
644 char *s;
646 name = DECL_SOURCE_FILE (fndecl);
647 for (i = 0;
648 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
649 ++i)
651 if (strstr (name, s) != NULL)
652 return true;
656 return false;
660 /* Handle the vector of command line options. LANG_MASK
661 contains has a single bit set representing the current
662 language. */
663 static void
664 read_cmdline_options (struct cl_decoded_option *decoded_options,
665 unsigned int decoded_options_count,
666 unsigned int lang_mask)
668 unsigned int i;
670 for (i = 1; i < decoded_options_count; i++)
672 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
674 if (main_input_filename == NULL)
676 main_input_filename = decoded_options[i].arg;
677 main_input_baselength
678 = base_of_path (main_input_filename, &main_input_basename);
680 add_input_filename (decoded_options[i].arg);
681 continue;
684 read_cmdline_option (decoded_options + i, lang_mask);
688 /* Parse command line options and set default flag values. Do minimal
689 options processing. The decoded options are placed in *DECODED_OPTIONS
690 and *DECODED_OPTIONS_COUNT. */
691 void
692 decode_options (unsigned int argc, const char **argv,
693 struct cl_decoded_option **decoded_options,
694 unsigned int *decoded_options_count)
696 static bool first_time_p = true;
697 static int initial_min_crossjump_insns;
698 static int initial_max_fields_for_field_sensitive;
699 static int initial_loop_invariant_max_bbs_in_loop;
700 static unsigned int initial_lang_mask;
702 unsigned int i, lang_mask;
703 int opt1;
704 int opt2;
705 int opt3;
706 int opt1_max;
707 int ofast = 0;
709 if (first_time_p)
711 /* Perform language-specific options initialization. */
712 initial_lang_mask = lang_mask = lang_hooks.option_lang_mask ();
714 lang_hooks.initialize_diagnostics (global_dc);
716 /* Save initial values of parameters we reset. */
717 initial_min_crossjump_insns
718 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
719 initial_max_fields_for_field_sensitive
720 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
721 initial_loop_invariant_max_bbs_in_loop
722 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
724 else
725 lang_mask = initial_lang_mask;
727 decode_cmdline_options_to_array (argc, argv, lang_mask,
728 decoded_options, decoded_options_count);
729 if (first_time_p)
730 /* Perform language-specific options initialization. */
731 lang_hooks.init_options (*decoded_options_count, *decoded_options);
733 /* Scan to see what optimization level has been specified. That will
734 determine the default value of many flags. */
735 for (i = 1; i < *decoded_options_count; i++)
737 struct cl_decoded_option *opt = &(*decoded_options)[i];
738 switch (opt->opt_index)
740 case OPT_O:
741 if (*opt->arg == '\0')
743 optimize = 1;
744 optimize_size = 0;
745 ofast = 0;
747 else
749 const int optimize_val = integral_argument (opt->arg);
750 if (optimize_val == -1)
751 error ("argument to %qs should be a non-negative integer",
752 "-O");
753 else
755 optimize = optimize_val;
756 if ((unsigned int) optimize > 255)
757 optimize = 255;
758 optimize_size = 0;
759 ofast = 0;
762 break;
764 case OPT_Os:
765 optimize_size = 1;
767 /* Optimizing for size forces optimize to be 2. */
768 optimize = 2;
769 ofast = 0;
770 break;
772 case OPT_Ofast:
773 /* -Ofast only adds flags to -O3. */
774 optimize_size = 0;
775 optimize = 3;
776 ofast = 1;
777 break;
779 default:
780 /* Ignore other options in this prescan. */
781 break;
785 /* Use priority coloring if cover classes is not defined for the
786 target. */
787 if (targetm.ira_cover_classes == NULL)
788 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
790 /* -O1 optimizations. */
791 opt1 = (optimize >= 1);
792 flag_defer_pop = opt1;
793 #ifdef DELAY_SLOTS
794 flag_delayed_branch = opt1;
795 #endif
796 #ifdef CAN_DEBUG_WITHOUT_FP
797 flag_omit_frame_pointer = opt1;
798 #endif
799 flag_guess_branch_prob = opt1;
800 flag_cprop_registers = opt1;
801 flag_forward_propagate = opt1;
802 flag_if_conversion = opt1;
803 flag_if_conversion2 = opt1;
804 flag_ipa_pure_const = opt1;
805 flag_ipa_reference = opt1;
806 flag_ipa_profile = opt1;
807 flag_merge_constants = opt1;
808 flag_split_wide_types = opt1;
809 flag_tree_ccp = opt1;
810 flag_tree_dce = opt1;
811 flag_tree_dom = opt1;
812 flag_tree_dse = opt1;
813 flag_tree_ter = opt1;
814 flag_tree_sra = opt1;
815 flag_tree_copyrename = opt1;
816 flag_tree_fre = opt1;
817 flag_tree_copy_prop = opt1;
818 flag_tree_sink = opt1;
819 flag_tree_ch = opt1;
821 /* -O2 optimizations. */
822 opt2 = (optimize >= 2);
823 flag_inline_small_functions = opt2;
824 flag_indirect_inlining = opt2;
825 flag_partial_inlining = opt2;
826 flag_thread_jumps = opt2;
827 flag_crossjumping = opt2;
828 flag_optimize_sibling_calls = opt2;
829 flag_cse_follow_jumps = opt2;
830 flag_gcse = opt2;
831 flag_expensive_optimizations = opt2;
832 flag_rerun_cse_after_loop = opt2;
833 flag_caller_saves = opt2;
834 flag_peephole2 = opt2;
835 #ifdef INSN_SCHEDULING
836 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
837 flag_schedule_insns = opt2 && ! optimize_size;
838 flag_schedule_insns_after_reload = opt2;
839 #endif
840 flag_regmove = opt2;
841 flag_strict_aliasing = opt2;
842 flag_strict_overflow = opt2;
843 flag_reorder_blocks = opt2;
844 flag_reorder_functions = opt2;
845 flag_tree_vrp = opt2;
846 flag_tree_builtin_call_dce = opt2;
847 flag_tree_pre = opt2;
848 flag_tree_switch_conversion = opt2;
849 flag_ipa_cp = opt2;
850 flag_ipa_sra = opt2;
852 /* Track fields in field-sensitive alias analysis. */
853 set_param_value ("max-fields-for-field-sensitive",
854 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
856 /* For -O1 only do loop invariant motion for very small loops. */
857 set_param_value ("loop-invariant-max-bbs-in-loop",
858 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
860 /* -O3 optimizations. */
861 opt3 = (optimize >= 3);
862 flag_predictive_commoning = opt3;
863 flag_inline_functions = opt3;
864 flag_unswitch_loops = opt3;
865 flag_gcse_after_reload = opt3;
866 flag_tree_vectorize = opt3;
867 flag_ipa_cp_clone = opt3;
868 if (flag_ipa_cp_clone)
869 flag_ipa_cp = 1;
871 /* Just -O1/-O0 optimizations. */
872 opt1_max = (optimize <= 1);
873 align_loops = opt1_max;
874 align_jumps = opt1_max;
875 align_labels = opt1_max;
876 align_functions = opt1_max;
878 if (optimize_size)
880 /* Inlining of functions reducing size is a good idea regardless of them
881 being declared inline. */
882 flag_inline_functions = 1;
884 /* Basic optimization options. */
885 optimize_size = 1;
886 if (optimize > 2)
887 optimize = 2;
889 /* We want to crossjump as much as possible. */
890 set_param_value ("min-crossjump-insns", 1);
892 else
893 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
895 /* -Ofast adds optimizations to -O3. */
896 if (ofast)
898 /* Which is -ffast-math for now. */
899 set_fast_math_flags (1);
900 /* Allow targets to enable extra options with -Ofast
901 before general options processing so disabling them
902 again afterwards works. */
903 targetm.handle_ofast ();
906 /* Enable -Werror=coverage-mismatch by default */
907 enable_warning_as_error("coverage-mismatch", 1, lang_mask);
909 if (first_time_p)
911 /* Initialize whether `char' is signed. */
912 flag_signed_char = DEFAULT_SIGNED_CHAR;
913 /* Set this to a special "uninitialized" value. The actual default is
914 set after target options have been processed. */
915 flag_short_enums = 2;
917 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
918 modify it. */
919 target_flags = targetm.default_target_flags;
921 /* Some targets have ABI-specified unwind tables. */
922 flag_unwind_tables = targetm.unwind_tables_default;
925 #ifdef ENABLE_LTO
926 /* Clear any options currently held for LTO. */
927 lto_clear_user_options ();
928 #endif
930 #ifdef OPTIMIZATION_OPTIONS
931 /* Allow default optimizations to be specified on a per-machine basis. */
932 OPTIMIZATION_OPTIONS (optimize, optimize_size);
933 #endif
935 read_cmdline_options (*decoded_options, *decoded_options_count, lang_mask);
937 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
939 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
940 directory. Then try to make DUMP_BASE_NAME relative to the
941 AUX_BASE_NAME directory, typically the directory to contain
942 the object file. */
943 if (dump_dir_name)
944 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
945 else if (aux_base_name)
947 const char *aux_base;
949 base_of_path (aux_base_name, &aux_base);
950 if (aux_base_name != aux_base)
952 int dir_len = aux_base - aux_base_name;
953 char *new_dump_base_name =
954 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
956 /* Copy directory component from AUX_BASE_NAME. */
957 memcpy (new_dump_base_name, aux_base_name, dir_len);
958 /* Append existing DUMP_BASE_NAME. */
959 strcpy (new_dump_base_name + dir_len, dump_base_name);
960 dump_base_name = new_dump_base_name;
965 /* Handle related options for unit-at-a-time, toplevel-reorder, and
966 section-anchors. */
967 if (!flag_unit_at_a_time)
969 if (flag_section_anchors == 1)
970 error ("Section anchors must be disabled when unit-at-a-time "
971 "is disabled.");
972 flag_section_anchors = 0;
973 if (flag_toplevel_reorder == 1)
974 error ("Toplevel reorder must be disabled when unit-at-a-time "
975 "is disabled.");
976 flag_toplevel_reorder = 0;
979 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
980 if (warn_missing_noreturn)
981 warn_suggest_attribute_noreturn = true;
983 /* Unless the user has asked for section anchors, we disable toplevel
984 reordering at -O0 to disable transformations that might be surprising
985 to end users and to get -fno-toplevel-reorder tested. */
986 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
988 flag_toplevel_reorder = 0;
989 flag_section_anchors = 0;
991 if (!flag_toplevel_reorder)
993 if (flag_section_anchors == 1)
994 error ("section anchors must be disabled when toplevel reorder"
995 " is disabled");
996 flag_section_anchors = 0;
999 if (first_time_p)
1001 if (flag_pie)
1002 flag_pic = flag_pie;
1003 if (flag_pic && !flag_pie)
1004 flag_shlib = 1;
1005 first_time_p = false;
1008 if (optimize == 0)
1010 /* Inlining does not work if not optimizing,
1011 so force it not to be done. */
1012 warn_inline = 0;
1013 flag_no_inline = 1;
1016 /* The optimization to partition hot and cold basic blocks into separate
1017 sections of the .o and executable files does not work (currently)
1018 with exception handling. This is because there is no support for
1019 generating unwind info. If flag_exceptions is turned on we need to
1020 turn off the partitioning optimization. */
1022 if (flag_exceptions && flag_reorder_blocks_and_partition
1023 && (USING_SJLJ_EXCEPTIONS
1024 #ifdef TARGET_UNWIND_INFO
1025 || 1
1026 #endif
1029 inform (input_location,
1030 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1031 flag_reorder_blocks_and_partition = 0;
1032 flag_reorder_blocks = 1;
1035 /* If user requested unwind info, then turn off the partitioning
1036 optimization. */
1038 if (flag_unwind_tables && ! targetm.unwind_tables_default
1039 && flag_reorder_blocks_and_partition
1040 && (USING_SJLJ_EXCEPTIONS
1041 #ifdef TARGET_UNWIND_INFO
1042 || 1
1043 #endif
1046 inform (input_location,
1047 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1048 flag_reorder_blocks_and_partition = 0;
1049 flag_reorder_blocks = 1;
1052 /* If the target requested unwind info, then turn off the partitioning
1053 optimization with a different message. Likewise, if the target does not
1054 support named sections. */
1056 if (flag_reorder_blocks_and_partition
1057 && (!targetm.have_named_sections
1058 || (flag_unwind_tables && targetm.unwind_tables_default
1059 && (USING_SJLJ_EXCEPTIONS
1060 #ifdef TARGET_UNWIND_INFO
1061 || 1
1062 #endif
1063 ))))
1065 inform (input_location,
1066 "-freorder-blocks-and-partition does not work on this architecture");
1067 flag_reorder_blocks_and_partition = 0;
1068 flag_reorder_blocks = 1;
1071 /* Pipelining of outer loops is only possible when general pipelining
1072 capabilities are requested. */
1073 if (!flag_sel_sched_pipelining)
1074 flag_sel_sched_pipelining_outer_loops = 0;
1076 if (!targetm.ira_cover_classes
1077 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1079 inform (input_location,
1080 "-fira-algorithm=CB does not work on this architecture");
1081 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1084 if (flag_conserve_stack)
1086 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1087 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1088 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1089 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1091 if (flag_wpa || flag_ltrans)
1093 /* These passes are not WHOPR compatible yet. */
1094 flag_ipa_pta = 0;
1095 flag_ipa_struct_reorg = 0;
1098 if (flag_lto || flag_whopr)
1100 #ifdef ENABLE_LTO
1101 flag_generate_lto = 1;
1103 /* When generating IL, do not operate in whole-program mode.
1104 Otherwise, symbols will be privatized too early, causing link
1105 errors later. */
1106 flag_whole_program = 0;
1107 #else
1108 error ("LTO support has not been enabled in this configuration");
1109 #endif
1112 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1113 check option consistency. */
1114 if (flag_lto && flag_whopr)
1115 error ("-flto and -fwhopr are mutually exclusive");
1118 #define LEFT_COLUMN 27
1120 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1121 followed by word-wrapped HELP in a second column. */
1122 static void
1123 wrap_help (const char *help,
1124 const char *item,
1125 unsigned int item_width,
1126 unsigned int columns)
1128 unsigned int col_width = LEFT_COLUMN;
1129 unsigned int remaining, room, len;
1131 remaining = strlen (help);
1135 room = columns - 3 - MAX (col_width, item_width);
1136 if (room > columns)
1137 room = 0;
1138 len = remaining;
1140 if (room < len)
1142 unsigned int i;
1144 for (i = 0; help[i]; i++)
1146 if (i >= room && len != remaining)
1147 break;
1148 if (help[i] == ' ')
1149 len = i;
1150 else if ((help[i] == '-' || help[i] == '/')
1151 && help[i + 1] != ' '
1152 && i > 0 && ISALPHA (help[i - 1]))
1153 len = i + 1;
1157 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1158 item_width = 0;
1159 while (help[len] == ' ')
1160 len++;
1161 help += len;
1162 remaining -= len;
1164 while (remaining);
1167 /* Print help for a specific front-end, etc. */
1168 static void
1169 print_filtered_help (unsigned int include_flags,
1170 unsigned int exclude_flags,
1171 unsigned int any_flags,
1172 unsigned int columns)
1174 unsigned int i;
1175 const char *help;
1176 static char *printed = NULL;
1177 bool found = false;
1178 bool displayed = false;
1180 if (include_flags == CL_PARAMS)
1182 for (i = 0; i < LAST_PARAM; i++)
1184 const char *param = compiler_params[i].option;
1186 help = compiler_params[i].help;
1187 if (help == NULL || *help == '\0')
1189 if (exclude_flags & CL_UNDOCUMENTED)
1190 continue;
1191 help = undocumented_msg;
1194 /* Get the translation. */
1195 help = _(help);
1197 wrap_help (help, param, strlen (param), columns);
1199 putchar ('\n');
1200 return;
1203 if (!printed)
1204 printed = XCNEWVAR (char, cl_options_count);
1206 for (i = 0; i < cl_options_count; i++)
1208 static char new_help[128];
1209 const struct cl_option *option = cl_options + i;
1210 unsigned int len;
1211 const char *opt;
1212 const char *tab;
1214 if (include_flags == 0
1215 || ((option->flags & include_flags) != include_flags))
1217 if ((option->flags & any_flags) == 0)
1218 continue;
1221 /* Skip unwanted switches. */
1222 if ((option->flags & exclude_flags) != 0)
1223 continue;
1225 found = true;
1226 /* Skip switches that have already been printed. */
1227 if (printed[i])
1228 continue;
1230 printed[i] = true;
1232 help = option->help;
1233 if (help == NULL)
1235 if (exclude_flags & CL_UNDOCUMENTED)
1236 continue;
1237 help = undocumented_msg;
1240 /* Get the translation. */
1241 help = _(help);
1243 /* Find the gap between the name of the
1244 option and its descriptive text. */
1245 tab = strchr (help, '\t');
1246 if (tab)
1248 len = tab - help;
1249 opt = help;
1250 help = tab + 1;
1252 else
1254 opt = option->opt_text;
1255 len = strlen (opt);
1258 /* With the -Q option enabled we change the descriptive text associated
1259 with an option to be an indication of its current setting. */
1260 if (!quiet_flag)
1262 if (len < (LEFT_COLUMN + 2))
1263 strcpy (new_help, "\t\t");
1264 else
1265 strcpy (new_help, "\t");
1267 if (option->flag_var != NULL)
1269 if (option->flags & CL_JOINED)
1271 if (option->var_type == CLVC_STRING)
1273 if (* (const char **) option->flag_var != NULL)
1274 snprintf (new_help + strlen (new_help),
1275 sizeof (new_help) - strlen (new_help),
1276 * (const char **) option->flag_var);
1278 else
1279 sprintf (new_help + strlen (new_help),
1280 "%#x", * (int *) option->flag_var);
1282 else
1283 strcat (new_help, option_enabled (i)
1284 ? _("[enabled]") : _("[disabled]"));
1287 help = new_help;
1290 wrap_help (help, opt, len, columns);
1291 displayed = true;
1294 if (! found)
1296 unsigned int langs = include_flags & CL_LANG_ALL;
1298 if (langs == 0)
1299 printf (_(" No options with the desired characteristics were found\n"));
1300 else
1302 unsigned int i;
1304 /* PR 31349: Tell the user how to see all of the
1305 options supported by a specific front end. */
1306 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1307 if ((1U << i) & langs)
1308 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1309 lang_names[i], lang_names[i]);
1313 else if (! displayed)
1314 printf (_(" All options with the desired characteristics have already been displayed\n"));
1316 putchar ('\n');
1319 /* Display help for a specified type of option.
1320 The options must have ALL of the INCLUDE_FLAGS set
1321 ANY of the flags in the ANY_FLAGS set
1322 and NONE of the EXCLUDE_FLAGS set. */
1323 static void
1324 print_specific_help (unsigned int include_flags,
1325 unsigned int exclude_flags,
1326 unsigned int any_flags)
1328 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1329 const char * description = NULL;
1330 const char * descrip_extra = "";
1331 size_t i;
1332 unsigned int flag;
1333 static unsigned int columns = 0;
1335 /* Sanity check: Make sure that we do not have more
1336 languages than we have bits available to enumerate them. */
1337 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1339 /* If we have not done so already, obtain
1340 the desired maximum width of the output. */
1341 if (columns == 0)
1343 const char *p;
1345 GET_ENVIRONMENT (p, "COLUMNS");
1346 if (p != NULL)
1348 int value = atoi (p);
1350 if (value > 0)
1351 columns = value;
1354 if (columns == 0)
1355 /* Use a reasonable default. */
1356 columns = 80;
1359 /* Decide upon the title for the options that we are going to display. */
1360 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1362 switch (flag & include_flags)
1364 case 0:
1365 break;
1367 case CL_TARGET:
1368 description = _("The following options are target specific");
1369 break;
1370 case CL_WARNING:
1371 description = _("The following options control compiler warning messages");
1372 break;
1373 case CL_OPTIMIZATION:
1374 description = _("The following options control optimizations");
1375 break;
1376 case CL_COMMON:
1377 description = _("The following options are language-independent");
1378 break;
1379 case CL_PARAMS:
1380 description = _("The --param option recognizes the following as parameters");
1381 break;
1382 default:
1383 if (i >= cl_lang_count)
1384 break;
1385 if (exclude_flags & all_langs_mask)
1386 description = _("The following options are specific to just the language ");
1387 else
1388 description = _("The following options are supported by the language ");
1389 descrip_extra = lang_names [i];
1390 break;
1394 if (description == NULL)
1396 if (any_flags == 0)
1398 if (include_flags & CL_UNDOCUMENTED)
1399 description = _("The following options are not documented");
1400 else if (include_flags & CL_SEPARATE)
1401 description = _("The following options take separate arguments");
1402 else if (include_flags & CL_JOINED)
1403 description = _("The following options take joined arguments");
1404 else
1406 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1407 include_flags);
1408 return;
1411 else
1413 if (any_flags & all_langs_mask)
1414 description = _("The following options are language-related");
1415 else
1416 description = _("The following options are language-independent");
1420 printf ("%s%s:\n", description, descrip_extra);
1421 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1424 /* Handle target- and language-independent options. Return zero to
1425 generate an "unknown option" message. Only options that need
1426 extra handling need to be listed here; if you simply want
1427 VALUE assigned to a variable, it happens automatically. */
1429 static int
1430 common_handle_option (size_t scode, const char *arg, int value,
1431 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED)
1433 static bool verbose = false;
1434 enum opt_code code = (enum opt_code) scode;
1436 switch (code)
1438 case OPT__param:
1439 handle_param (arg);
1440 break;
1442 case OPT_v:
1443 verbose = true;
1444 break;
1446 case OPT_fhelp:
1447 case OPT__help:
1449 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1450 unsigned int undoc_mask;
1451 unsigned int i;
1453 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1454 /* First display any single language specific options. */
1455 for (i = 0; i < cl_lang_count; i++)
1456 print_specific_help
1457 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1458 /* Next display any multi language specific options. */
1459 print_specific_help (0, undoc_mask, all_langs_mask);
1460 /* Then display any remaining, non-language options. */
1461 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1462 print_specific_help (i, undoc_mask, 0);
1463 exit_after_options = true;
1464 break;
1467 case OPT_ftarget_help:
1468 case OPT__target_help:
1469 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1470 exit_after_options = true;
1472 /* Allow the target a chance to give the user some additional information. */
1473 if (targetm.help)
1474 targetm.help ();
1475 break;
1477 case OPT_fhelp_:
1478 case OPT__help_:
1480 const char * a = arg;
1481 unsigned int include_flags = 0;
1482 /* Note - by default we include undocumented options when listing
1483 specific classes. If you only want to see documented options
1484 then add ",^undocumented" to the --help= option. E.g.:
1486 --help=target,^undocumented */
1487 unsigned int exclude_flags = 0;
1489 /* Walk along the argument string, parsing each word in turn.
1490 The format is:
1491 arg = [^]{word}[,{arg}]
1492 word = {optimizers|target|warnings|undocumented|
1493 params|common|<language>} */
1494 while (* a != 0)
1496 static struct
1498 const char * string;
1499 unsigned int flag;
1501 specifics[] =
1503 { "optimizers", CL_OPTIMIZATION },
1504 { "target", CL_TARGET },
1505 { "warnings", CL_WARNING },
1506 { "undocumented", CL_UNDOCUMENTED },
1507 { "params", CL_PARAMS },
1508 { "joined", CL_JOINED },
1509 { "separate", CL_SEPARATE },
1510 { "common", CL_COMMON },
1511 { NULL, 0 }
1513 unsigned int * pflags;
1514 const char * comma;
1515 unsigned int lang_flag, specific_flag;
1516 unsigned int len;
1517 unsigned int i;
1519 if (* a == '^')
1521 ++ a;
1522 pflags = & exclude_flags;
1524 else
1525 pflags = & include_flags;
1527 comma = strchr (a, ',');
1528 if (comma == NULL)
1529 len = strlen (a);
1530 else
1531 len = comma - a;
1532 if (len == 0)
1534 a = comma + 1;
1535 continue;
1538 /* Check to see if the string matches an option class name. */
1539 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1540 if (strncasecmp (a, specifics[i].string, len) == 0)
1542 specific_flag = specifics[i].flag;
1543 break;
1546 /* Check to see if the string matches a language name.
1547 Note - we rely upon the alpha-sorted nature of the entries in
1548 the lang_names array, specifically that shorter names appear
1549 before their longer variants. (i.e. C before C++). That way
1550 when we are attempting to match --help=c for example we will
1551 match with C first and not C++. */
1552 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1553 if (strncasecmp (a, lang_names[i], len) == 0)
1555 lang_flag = 1U << i;
1556 break;
1559 if (specific_flag != 0)
1561 if (lang_flag == 0)
1562 * pflags |= specific_flag;
1563 else
1565 /* The option's argument matches both the start of a
1566 language name and the start of an option class name.
1567 We have a special case for when the user has
1568 specified "--help=c", but otherwise we have to issue
1569 a warning. */
1570 if (strncasecmp (a, "c", len) == 0)
1571 * pflags |= lang_flag;
1572 else
1573 fnotice (stderr,
1574 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1575 len, a);
1578 else if (lang_flag != 0)
1579 * pflags |= lang_flag;
1580 else
1581 fnotice (stderr,
1582 "warning: unrecognized argument to --help= option: %.*s\n",
1583 len, a);
1585 if (comma == NULL)
1586 break;
1587 a = comma + 1;
1590 if (include_flags)
1591 print_specific_help (include_flags, exclude_flags, 0);
1592 exit_after_options = true;
1593 break;
1596 case OPT_fversion:
1597 case OPT__version:
1598 exit_after_options = true;
1599 break;
1601 case OPT_G:
1602 g_switch_value = value;
1603 g_switch_set = true;
1604 break;
1606 case OPT_O:
1607 case OPT_Os:
1608 case OPT_Ofast:
1609 /* Currently handled in a prescan. */
1610 break;
1612 case OPT_Werror_:
1613 enable_warning_as_error (arg, value, lang_mask);
1614 break;
1616 case OPT_Wlarger_than_:
1617 /* This form corresponds to -Wlarger-than-.
1618 Kept for backward compatibility.
1619 Don't use it as the first argument of warning(). */
1621 case OPT_Wlarger_than_eq:
1622 larger_than_size = value;
1623 warn_larger_than = value != -1;
1624 break;
1626 case OPT_Wfatal_errors:
1627 global_dc->fatal_errors = value;
1628 break;
1630 case OPT_Wframe_larger_than_:
1631 frame_larger_than_size = value;
1632 warn_frame_larger_than = value != -1;
1633 break;
1635 case OPT_Wstrict_aliasing:
1636 set_Wstrict_aliasing (value);
1637 break;
1639 case OPT_Wstrict_aliasing_:
1640 warn_strict_aliasing = value;
1641 break;
1643 case OPT_Wstrict_overflow:
1644 warn_strict_overflow = (value
1645 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1646 : 0);
1647 break;
1649 case OPT_Wstrict_overflow_:
1650 warn_strict_overflow = value;
1651 break;
1653 case OPT_Wsystem_headers:
1654 global_dc->warn_system_headers = value;
1655 break;
1657 case OPT_Wunused:
1658 warn_unused = value;
1659 break;
1661 case OPT_aux_info:
1662 case OPT_aux_info_:
1663 aux_info_file_name = arg;
1664 flag_gen_aux_info = 1;
1665 break;
1667 case OPT_auxbase:
1668 aux_base_name = arg;
1669 break;
1671 case OPT_auxbase_strip:
1673 char *tmp = xstrdup (arg);
1674 strip_off_ending (tmp, strlen (tmp));
1675 if (tmp[0])
1676 aux_base_name = tmp;
1678 break;
1680 case OPT_d:
1681 decode_d_option (arg);
1682 break;
1684 case OPT_dumpbase:
1685 dump_base_name = arg;
1686 break;
1688 case OPT_dumpdir:
1689 dump_dir_name = arg;
1690 break;
1692 case OPT_falign_functions_:
1693 align_functions = value;
1694 break;
1696 case OPT_falign_jumps_:
1697 align_jumps = value;
1698 break;
1700 case OPT_falign_labels_:
1701 align_labels = value;
1702 break;
1704 case OPT_falign_loops_:
1705 align_loops = value;
1706 break;
1708 case OPT_fbranch_probabilities:
1709 flag_branch_probabilities_set = true;
1710 break;
1712 case OPT_fcall_used_:
1713 fix_register (arg, 0, 1);
1714 break;
1716 case OPT_fcall_saved_:
1717 fix_register (arg, 0, 0);
1718 break;
1720 case OPT_fdbg_cnt_:
1721 dbg_cnt_process_opt (arg);
1722 break;
1724 case OPT_fdbg_cnt_list:
1725 dbg_cnt_list_all_counters ();
1726 break;
1728 case OPT_fdebug_prefix_map_:
1729 add_debug_prefix_map (arg);
1730 break;
1732 case OPT_fdiagnostics_show_location_:
1733 if (!strcmp (arg, "once"))
1734 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1735 else if (!strcmp (arg, "every-line"))
1736 diagnostic_prefixing_rule (global_dc)
1737 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1738 else
1739 return 0;
1740 break;
1742 case OPT_fdiagnostics_show_option:
1743 global_dc->show_option_requested = value;
1744 break;
1746 case OPT_fdump_:
1747 if (!dump_switch_p (arg))
1748 return 0;
1749 break;
1751 case OPT_fexcess_precision_:
1752 if (!strcmp (arg, "fast"))
1753 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1754 else if (!strcmp (arg, "standard"))
1755 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1756 else
1757 error ("unknown excess precision style \"%s\"", arg);
1758 break;
1760 case OPT_ffast_math:
1761 set_fast_math_flags (value);
1762 break;
1764 case OPT_funsafe_math_optimizations:
1765 set_unsafe_math_optimizations_flags (value);
1766 break;
1768 case OPT_ffixed_:
1769 fix_register (arg, 1, 1);
1770 break;
1772 case OPT_finline_limit_:
1773 case OPT_finline_limit_eq:
1774 set_param_value ("max-inline-insns-single", value / 2);
1775 set_param_value ("max-inline-insns-auto", value / 2);
1776 break;
1778 case OPT_finstrument_functions_exclude_function_list_:
1779 add_comma_separated_to_vector
1780 (&flag_instrument_functions_exclude_functions, arg);
1781 break;
1783 case OPT_finstrument_functions_exclude_file_list_:
1784 add_comma_separated_to_vector
1785 (&flag_instrument_functions_exclude_files, arg);
1786 break;
1788 case OPT_fmessage_length_:
1789 pp_set_line_maximum_length (global_dc->printer, value);
1790 break;
1792 case OPT_fpack_struct_:
1793 if (value <= 0 || (value & (value - 1)) || value > 16)
1794 error ("structure alignment must be a small power of two, not %d", value);
1795 else
1797 initial_max_fld_align = value;
1798 maximum_field_alignment = value * BITS_PER_UNIT;
1800 break;
1802 case OPT_fpeel_loops:
1803 flag_peel_loops_set = true;
1804 break;
1806 case OPT_fplugin_:
1807 #ifdef ENABLE_PLUGIN
1808 add_new_plugin (arg);
1809 #else
1810 error ("Plugin support is disabled. Configure with --enable-plugin.");
1811 #endif
1812 break;
1814 case OPT_fplugin_arg_:
1815 #ifdef ENABLE_PLUGIN
1816 parse_plugin_arg_opt (arg);
1817 #else
1818 error ("Plugin support is disabled. Configure with --enable-plugin.");
1819 #endif
1820 break;
1822 case OPT_fprofile_arcs:
1823 profile_arc_flag_set = true;
1824 break;
1826 case OPT_finline_functions:
1827 flag_inline_functions_set = true;
1828 break;
1830 case OPT_fprofile_dir_:
1831 profile_data_prefix = xstrdup (arg);
1832 break;
1834 case OPT_fprofile_use_:
1835 profile_data_prefix = xstrdup (arg);
1836 flag_profile_use = true;
1837 value = true;
1838 /* No break here - do -fprofile-use processing. */
1839 case OPT_fprofile_use:
1840 if (!flag_branch_probabilities_set)
1841 flag_branch_probabilities = value;
1842 if (!flag_profile_values_set)
1843 flag_profile_values = value;
1844 if (!flag_unroll_loops_set)
1845 flag_unroll_loops = value;
1846 if (!flag_peel_loops_set)
1847 flag_peel_loops = value;
1848 if (!flag_tracer_set)
1849 flag_tracer = value;
1850 if (!flag_value_profile_transformations_set)
1851 flag_value_profile_transformations = value;
1852 if (!flag_inline_functions_set)
1853 flag_inline_functions = value;
1854 if (!flag_ipa_cp_set)
1855 flag_ipa_cp = value;
1856 if (!flag_ipa_cp_clone_set
1857 && value && flag_ipa_cp)
1858 flag_ipa_cp_clone = value;
1859 if (!flag_predictive_commoning_set)
1860 flag_predictive_commoning = value;
1861 if (!flag_unswitch_loops_set)
1862 flag_unswitch_loops = value;
1863 if (!flag_gcse_after_reload_set)
1864 flag_gcse_after_reload = value;
1865 break;
1867 case OPT_fprofile_generate_:
1868 profile_data_prefix = xstrdup (arg);
1869 value = true;
1870 /* No break here - do -fprofile-generate processing. */
1871 case OPT_fprofile_generate:
1872 if (!profile_arc_flag_set)
1873 profile_arc_flag = value;
1874 if (!flag_profile_values_set)
1875 flag_profile_values = value;
1876 if (!flag_value_profile_transformations_set)
1877 flag_value_profile_transformations = value;
1878 if (!flag_inline_functions_set)
1879 flag_inline_functions = value;
1880 break;
1882 case OPT_fprofile_values:
1883 flag_profile_values_set = true;
1884 break;
1886 case OPT_fshow_column:
1887 global_dc->show_column = value;
1888 break;
1890 case OPT_fvisibility_:
1892 if (!strcmp(arg, "default"))
1893 default_visibility = VISIBILITY_DEFAULT;
1894 else if (!strcmp(arg, "internal"))
1895 default_visibility = VISIBILITY_INTERNAL;
1896 else if (!strcmp(arg, "hidden"))
1897 default_visibility = VISIBILITY_HIDDEN;
1898 else if (!strcmp(arg, "protected"))
1899 default_visibility = VISIBILITY_PROTECTED;
1900 else
1901 error ("unrecognized visibility value \"%s\"", arg);
1903 break;
1905 case OPT_fvpt:
1906 flag_value_profile_transformations_set = true;
1907 break;
1909 case OPT_frandom_seed:
1910 /* The real switch is -fno-random-seed. */
1911 if (value)
1912 return 0;
1913 set_random_seed (NULL);
1914 break;
1916 case OPT_frandom_seed_:
1917 set_random_seed (arg);
1918 break;
1920 case OPT_fselective_scheduling:
1921 case OPT_fselective_scheduling2:
1922 sel_sched_switch_set = true;
1923 break;
1925 case OPT_fsched_verbose_:
1926 #ifdef INSN_SCHEDULING
1927 fix_sched_param ("verbose", arg);
1928 break;
1929 #else
1930 return 0;
1931 #endif
1933 case OPT_fsched_stalled_insns_:
1934 flag_sched_stalled_insns = value;
1935 if (flag_sched_stalled_insns == 0)
1936 flag_sched_stalled_insns = -1;
1937 break;
1939 case OPT_fsched_stalled_insns_dep_:
1940 flag_sched_stalled_insns_dep = value;
1941 break;
1943 case OPT_fstack_check_:
1944 if (!strcmp (arg, "no"))
1945 flag_stack_check = NO_STACK_CHECK;
1946 else if (!strcmp (arg, "generic"))
1947 /* This is the old stack checking method. */
1948 flag_stack_check = STACK_CHECK_BUILTIN
1949 ? FULL_BUILTIN_STACK_CHECK
1950 : GENERIC_STACK_CHECK;
1951 else if (!strcmp (arg, "specific"))
1952 /* This is the new stack checking method. */
1953 flag_stack_check = STACK_CHECK_BUILTIN
1954 ? FULL_BUILTIN_STACK_CHECK
1955 : STACK_CHECK_STATIC_BUILTIN
1956 ? STATIC_BUILTIN_STACK_CHECK
1957 : GENERIC_STACK_CHECK;
1958 else
1959 warning (0, "unknown stack check parameter \"%s\"", arg);
1960 break;
1962 case OPT_fstack_check:
1963 /* This is the same as the "specific" mode above. */
1964 if (value)
1965 flag_stack_check = STACK_CHECK_BUILTIN
1966 ? FULL_BUILTIN_STACK_CHECK
1967 : STACK_CHECK_STATIC_BUILTIN
1968 ? STATIC_BUILTIN_STACK_CHECK
1969 : GENERIC_STACK_CHECK;
1970 else
1971 flag_stack_check = NO_STACK_CHECK;
1972 break;
1974 case OPT_fstack_limit:
1975 /* The real switch is -fno-stack-limit. */
1976 if (value)
1977 return 0;
1978 stack_limit_rtx = NULL_RTX;
1979 break;
1981 case OPT_fstack_limit_register_:
1983 int reg = decode_reg_name (arg);
1984 if (reg < 0)
1985 error ("unrecognized register name \"%s\"", arg);
1986 else
1987 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1989 break;
1991 case OPT_fstack_limit_symbol_:
1992 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1993 break;
1995 case OPT_ftree_vectorizer_verbose_:
1996 vect_set_verbosity_level (arg);
1997 break;
1999 case OPT_ftls_model_:
2000 if (!strcmp (arg, "global-dynamic"))
2001 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2002 else if (!strcmp (arg, "local-dynamic"))
2003 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2004 else if (!strcmp (arg, "initial-exec"))
2005 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2006 else if (!strcmp (arg, "local-exec"))
2007 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2008 else
2009 warning (0, "unknown tls-model \"%s\"", arg);
2010 break;
2012 case OPT_fira_algorithm_:
2013 if (!strcmp (arg, "CB"))
2014 flag_ira_algorithm = IRA_ALGORITHM_CB;
2015 else if (!strcmp (arg, "priority"))
2016 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2017 else
2018 warning (0, "unknown ira algorithm \"%s\"", arg);
2019 break;
2021 case OPT_fira_region_:
2022 if (!strcmp (arg, "one"))
2023 flag_ira_region = IRA_REGION_ONE;
2024 else if (!strcmp (arg, "all"))
2025 flag_ira_region = IRA_REGION_ALL;
2026 else if (!strcmp (arg, "mixed"))
2027 flag_ira_region = IRA_REGION_MIXED;
2028 else
2029 warning (0, "unknown ira region \"%s\"", arg);
2030 break;
2032 case OPT_fira_verbose_:
2033 flag_ira_verbose = value;
2034 break;
2036 case OPT_ftracer:
2037 flag_tracer_set = true;
2038 break;
2040 case OPT_fipa_cp:
2041 flag_ipa_cp_set = true;
2042 break;
2044 case OPT_fipa_cp_clone:
2045 flag_ipa_cp_clone_set = true;
2046 break;
2048 case OPT_fpredictive_commoning:
2049 flag_predictive_commoning_set = true;
2050 break;
2052 case OPT_funswitch_loops:
2053 flag_unswitch_loops_set = true;
2054 break;
2056 case OPT_fgcse_after_reload:
2057 flag_gcse_after_reload_set = true;
2058 break;
2060 case OPT_funroll_loops:
2061 flag_unroll_loops_set = true;
2062 break;
2064 case OPT_g:
2065 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2066 break;
2068 case OPT_gcoff:
2069 set_debug_level (SDB_DEBUG, false, arg);
2070 break;
2072 case OPT_gdwarf_:
2073 if (value < 2 || value > 4)
2074 error ("dwarf version %d is not supported", value);
2075 else
2076 dwarf_version = value;
2077 set_debug_level (DWARF2_DEBUG, false, "");
2078 break;
2080 case OPT_ggdb:
2081 set_debug_level (NO_DEBUG, 2, arg);
2082 break;
2084 case OPT_gstabs:
2085 case OPT_gstabs_:
2086 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2087 break;
2089 case OPT_gvms:
2090 set_debug_level (VMS_DEBUG, false, arg);
2091 break;
2093 case OPT_gxcoff:
2094 case OPT_gxcoff_:
2095 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2096 break;
2098 case OPT_o:
2099 asm_file_name = arg;
2100 break;
2102 case OPT_pedantic_errors:
2103 flag_pedantic_errors = pedantic = 1;
2104 global_dc->pedantic_errors = 1;
2105 break;
2107 case OPT_fwhopr:
2108 flag_whopr = value;
2109 break;
2111 case OPT_w:
2112 global_dc->inhibit_warnings = true;
2113 break;
2115 case OPT_fsee:
2116 case OPT_fcse_skip_blocks:
2117 case OPT_floop_optimize:
2118 case OPT_frerun_loop_opt:
2119 case OPT_fsched2_use_traces:
2120 case OPT_fstrength_reduce:
2121 case OPT_ftree_store_copy_prop:
2122 case OPT_fforce_addr:
2123 case OPT_ftree_salias:
2124 case OPT_ftree_store_ccp:
2125 case OPT_Wunreachable_code:
2126 case OPT_fargument_alias:
2127 case OPT_fargument_noalias:
2128 case OPT_fargument_noalias_anything:
2129 case OPT_fargument_noalias_global:
2130 /* These are no-ops, preserved for backward compatibility. */
2131 break;
2133 case OPT_fuse_linker_plugin:
2134 /* No-op. Used by the driver and passed to us because it starts with f.*/
2135 break;
2137 default:
2138 /* If the flag was handled in a standard way, assume the lack of
2139 processing here is intentional. */
2140 gcc_assert (cl_options[scode].flag_var);
2141 break;
2144 return 1;
2147 /* Handle --param NAME=VALUE. */
2148 static void
2149 handle_param (const char *carg)
2151 char *equal, *arg;
2152 int value;
2154 arg = xstrdup (carg);
2155 equal = strchr (arg, '=');
2156 if (!equal)
2157 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2158 else
2160 value = integral_argument (equal + 1);
2161 if (value == -1)
2162 error ("invalid --param value %qs", equal + 1);
2163 else
2165 *equal = '\0';
2166 set_param_value (arg, value);
2170 free (arg);
2173 /* Used to set the level of strict aliasing warnings,
2174 when no level is specified (i.e., when -Wstrict-aliasing, and not
2175 -Wstrict-aliasing=level was given).
2176 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2177 and 0 otherwise. After calling this function, wstrict_aliasing will be
2178 set to the default value of -Wstrict_aliasing=level, currently 3. */
2179 void
2180 set_Wstrict_aliasing (int onoff)
2182 gcc_assert (onoff == 0 || onoff == 1);
2183 if (onoff != 0)
2184 warn_strict_aliasing = 3;
2185 else
2186 warn_strict_aliasing = 0;
2189 /* The following routines are useful in setting all the flags that
2190 -ffast-math and -fno-fast-math imply. */
2191 void
2192 set_fast_math_flags (int set)
2194 flag_unsafe_math_optimizations = set;
2195 set_unsafe_math_optimizations_flags (set);
2196 flag_finite_math_only = set;
2197 flag_errno_math = !set;
2198 if (set)
2200 flag_signaling_nans = 0;
2201 flag_rounding_math = 0;
2202 flag_cx_limited_range = 1;
2206 /* When -funsafe-math-optimizations is set the following
2207 flags are set as well. */
2208 void
2209 set_unsafe_math_optimizations_flags (int set)
2211 flag_trapping_math = !set;
2212 flag_signed_zeros = !set;
2213 flag_associative_math = set;
2214 flag_reciprocal_math = set;
2217 /* Return true iff flags are set as if -ffast-math. */
2218 bool
2219 fast_math_flags_set_p (void)
2221 return (!flag_trapping_math
2222 && flag_unsafe_math_optimizations
2223 && flag_finite_math_only
2224 && !flag_signed_zeros
2225 && !flag_errno_math);
2228 /* Return true iff flags are set as if -ffast-math but using the flags stored
2229 in the struct cl_optimization structure. */
2230 bool
2231 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2233 return (!opt->flag_trapping_math
2234 && opt->flag_unsafe_math_optimizations
2235 && opt->flag_finite_math_only
2236 && !opt->flag_signed_zeros
2237 && !opt->flag_errno_math);
2240 /* Handle a debug output -g switch. EXTENDED is true or false to support
2241 extended output (2 is special and means "-ggdb" was given). */
2242 static void
2243 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2245 static bool type_explicit;
2247 use_gnu_debug_info_extensions = extended;
2249 if (type == NO_DEBUG)
2251 if (write_symbols == NO_DEBUG)
2253 write_symbols = PREFERRED_DEBUGGING_TYPE;
2255 if (extended == 2)
2257 #ifdef DWARF2_DEBUGGING_INFO
2258 write_symbols = DWARF2_DEBUG;
2259 #elif defined DBX_DEBUGGING_INFO
2260 write_symbols = DBX_DEBUG;
2261 #endif
2264 if (write_symbols == NO_DEBUG)
2265 warning (0, "target system does not support debug output");
2268 else
2270 /* Does it conflict with an already selected type? */
2271 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2272 error ("debug format \"%s\" conflicts with prior selection",
2273 debug_type_names[type]);
2274 write_symbols = type;
2275 type_explicit = true;
2278 /* A debug flag without a level defaults to level 2. */
2279 if (*arg == '\0')
2281 if (!debug_info_level)
2282 debug_info_level = DINFO_LEVEL_NORMAL;
2284 else
2286 int argval = integral_argument (arg);
2287 if (argval == -1)
2288 error ("unrecognised debug output level \"%s\"", arg);
2289 else if (argval > 3)
2290 error ("debug output level %s is too high", arg);
2291 else
2292 debug_info_level = (enum debug_info_level) argval;
2296 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2297 a simple on-off switch. */
2300 option_enabled (int opt_idx)
2302 const struct cl_option *option = &(cl_options[opt_idx]);
2304 if (option->flag_var)
2305 switch (option->var_type)
2307 case CLVC_BOOLEAN:
2308 return *(int *) option->flag_var != 0;
2310 case CLVC_EQUAL:
2311 return *(int *) option->flag_var == option->var_value;
2313 case CLVC_BIT_CLEAR:
2314 return (*(int *) option->flag_var & option->var_value) == 0;
2316 case CLVC_BIT_SET:
2317 return (*(int *) option->flag_var & option->var_value) != 0;
2319 case CLVC_STRING:
2320 break;
2322 return -1;
2325 /* Fill STATE with the current state of option OPTION. Return true if
2326 there is some state to store. */
2328 bool
2329 get_option_state (int option, struct cl_option_state *state)
2331 if (cl_options[option].flag_var == 0)
2332 return false;
2334 switch (cl_options[option].var_type)
2336 case CLVC_BOOLEAN:
2337 case CLVC_EQUAL:
2338 state->data = cl_options[option].flag_var;
2339 state->size = sizeof (int);
2340 break;
2342 case CLVC_BIT_CLEAR:
2343 case CLVC_BIT_SET:
2344 state->ch = option_enabled (option);
2345 state->data = &state->ch;
2346 state->size = 1;
2347 break;
2349 case CLVC_STRING:
2350 state->data = *(const char **) cl_options[option].flag_var;
2351 if (state->data == 0)
2352 state->data = "";
2353 state->size = strlen ((const char *) state->data) + 1;
2354 break;
2356 return true;
2359 /* Set *OPTION according to VALUE and ARG. */
2361 void
2362 set_option (int opt_index, int value, const char *arg, int kind)
2364 const struct cl_option *option = &cl_options[opt_index];
2366 if (!option->flag_var)
2367 return;
2369 switch (option->var_type)
2371 case CLVC_BOOLEAN:
2372 *(int *) option->flag_var = value;
2373 break;
2375 case CLVC_EQUAL:
2376 *(int *) option->flag_var = (value
2377 ? option->var_value
2378 : !option->var_value);
2379 break;
2381 case CLVC_BIT_CLEAR:
2382 case CLVC_BIT_SET:
2383 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2384 *(int *) option->flag_var |= option->var_value;
2385 else
2386 *(int *) option->flag_var &= ~option->var_value;
2387 if (option->flag_var == &target_flags)
2388 target_flags_explicit |= option->var_value;
2389 break;
2391 case CLVC_STRING:
2392 *(const char **) option->flag_var = arg;
2393 break;
2396 if ((diagnostic_t)kind != DK_UNSPECIFIED)
2397 diagnostic_classify_diagnostic (global_dc, opt_index, (diagnostic_t)kind,
2398 UNKNOWN_LOCATION);
2402 /* Callback function, called when -Werror= enables a warning. */
2404 static void (*warning_as_error_callback) (int) = NULL;
2406 /* Register a callback for enable_warning_as_error calls. */
2408 void
2409 register_warning_as_error_callback (void (*callback) (int))
2411 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2412 warning_as_error_callback = callback;
2415 /* Enable a warning option as an error. This is used by -Werror= and
2416 also by legacy Werror-implicit-function-declaration. */
2418 void
2419 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2421 char *new_option;
2422 int option_index;
2424 new_option = XNEWVEC (char, strlen (arg) + 2);
2425 new_option[0] = 'W';
2426 strcpy (new_option + 1, arg);
2427 option_index = find_opt (new_option, lang_mask);
2428 if (option_index == OPT_SPECIAL_unknown)
2430 error ("-Werror=%s: No option -%s", arg, new_option);
2432 else
2434 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2436 diagnostic_classify_diagnostic (global_dc, option_index, kind,
2437 UNKNOWN_LOCATION);
2438 if (kind == DK_ERROR)
2440 const struct cl_option * const option = cl_options + option_index;
2442 /* -Werror=foo implies -Wfoo. */
2443 if (option->var_type == CLVC_BOOLEAN)
2444 handle_option (option_index, value, arg, lang_mask, (int)kind);
2446 if (warning_as_error_callback)
2447 warning_as_error_callback (option_index);
2450 free (new_option);
2453 /* Return malloced memory for the name of the option OPTION_INDEX
2454 which enabled a diagnostic (context CONTEXT), originally of type
2455 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2456 as -Werror. */
2458 char *
2459 option_name (diagnostic_context *context, int option_index,
2460 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2462 if (option_index)
2464 /* A warning classified as an error. */
2465 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2466 && diag_kind == DK_ERROR)
2467 return concat (cl_options[OPT_Werror_].opt_text,
2468 /* Skip over "-W". */
2469 cl_options[option_index].opt_text + 2,
2470 NULL);
2471 /* A warning with option. */
2472 else
2473 return xstrdup (cl_options[option_index].opt_text);
2475 /* A warning without option classified as an error. */
2476 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2477 || diag_kind == DK_WARNING)
2479 if (context->warning_as_error_requested)
2480 return xstrdup (cl_options[OPT_Werror].opt_text);
2481 else
2482 return xstrdup (_("enabled by default"));
2484 else
2485 return NULL;