Merged r158704 through r158906 into branch.
[official-gcc.git] / gcc / opts.c
blob507b50227ee9b242b9d21e0bce4230809d0d448c
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 "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
41 #include "target.h"
42 #include "tree-pass.h"
43 #include "dbgcnt.h"
44 #include "debug.h"
45 #include "plugin.h"
46 #include "except.h"
47 #include "lto-streamer.h"
49 /* Value of the -G xx switch, and whether it was passed or not. */
50 unsigned HOST_WIDE_INT g_switch_value;
51 bool g_switch_set;
53 /* Same for selective scheduling. */
54 bool sel_sched_switch_set;
56 /* True if we should exit after parsing options. */
57 bool exit_after_options;
59 /* True to warn about any objects definitions whose size is larger
60 than N bytes. Also want about function definitions whose returned
61 values are larger than N bytes, where N is `larger_than_size'. */
62 bool warn_larger_than;
63 HOST_WIDE_INT larger_than_size;
65 /* True to warn about any function whose frame size is larger
66 * than N bytes. */
67 bool warn_frame_larger_than;
68 HOST_WIDE_INT frame_larger_than_size;
70 /* Type(s) of debugging information we are producing (if any). See
71 flags.h for the definitions of the different possible types of
72 debugging information. */
73 enum debug_info_type write_symbols = NO_DEBUG;
75 /* Level of debugging information we are producing. See flags.h for
76 the definitions of the different possible levels. */
77 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
79 /* A major contribution to object and executable size is debug
80 information size. A major contribution to debug information size
81 is struct descriptions replicated in several object files. The
82 following flags attempt to reduce this information. The basic
83 idea is to not emit struct debugging information in the current
84 compilation unit when that information will be generated by
85 another compilation unit.
87 Debug information for a struct defined in the current source
88 file should be generated in the object file. Likewise the
89 debug information for a struct defined in a header should be
90 generated in the object file of the corresponding source file.
91 Both of these case are handled when the base name of the file of
92 the struct definition matches the base name of the source file
93 of the current compilation unit. This matching emits minimal
94 struct debugging information.
96 The base file name matching rule above will fail to emit debug
97 information for structs defined in system headers. So a second
98 category of files includes system headers in addition to files
99 with matching bases.
101 The remaining types of files are library headers and application
102 headers. We cannot currently distinguish these two types. */
104 enum debug_struct_file
106 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
107 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
108 same base name as the compilation unit. */
109 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
110 header files. */
111 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
114 /* Generic structs (e.g. templates not explicitly specialized)
115 may not have a compilation unit associated with them, and so
116 may need to be treated differently from ordinary structs.
118 Structs only handled by reference (indirectly), will also usually
119 not need as much debugging information. */
121 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
122 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
123 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
124 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
126 /* Parse the -femit-struct-debug-detailed option value
127 and set the flag variables. */
129 #define MATCH( prefix, string ) \
130 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
131 ? ((string += sizeof prefix - 1), 1) : 0)
133 void
134 set_struct_debug_option (const char *spec)
136 /* various labels for comparison */
137 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
138 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
139 static char none_lbl[] = "none", any_lbl[] = "any";
140 static char base_lbl[] = "base", sys_lbl[] = "sys";
142 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
143 /* Default is to apply to as much as possible. */
144 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
145 int ord = 1, gen = 1;
147 /* What usage? */
148 if (MATCH (dfn_lbl, spec))
149 usage = DINFO_USAGE_DFN;
150 else if (MATCH (dir_lbl, spec))
151 usage = DINFO_USAGE_DIR_USE;
152 else if (MATCH (ind_lbl, spec))
153 usage = DINFO_USAGE_IND_USE;
155 /* Generics or not? */
156 if (MATCH (ord_lbl, spec))
157 gen = 0;
158 else if (MATCH (gen_lbl, spec))
159 ord = 0;
161 /* What allowable environment? */
162 if (MATCH (none_lbl, spec))
163 files = DINFO_STRUCT_FILE_NONE;
164 else if (MATCH (any_lbl, spec))
165 files = DINFO_STRUCT_FILE_ANY;
166 else if (MATCH (sys_lbl, spec))
167 files = DINFO_STRUCT_FILE_SYS;
168 else if (MATCH (base_lbl, spec))
169 files = DINFO_STRUCT_FILE_BASE;
170 else
171 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
172 spec);
174 /* Effect the specification. */
175 if (usage == DINFO_USAGE_NUM_ENUMS)
177 if (ord)
179 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
180 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
181 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
183 if (gen)
185 debug_struct_generic[DINFO_USAGE_DFN] = files;
186 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
187 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
190 else
192 if (ord)
193 debug_struct_ordinary[usage] = files;
194 if (gen)
195 debug_struct_generic[usage] = files;
198 if (*spec == ',')
199 set_struct_debug_option (spec+1);
200 else
202 /* No more -femit-struct-debug-detailed specifications.
203 Do final checks. */
204 if (*spec != '\0')
205 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
206 spec);
207 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
208 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
209 || debug_struct_generic[DINFO_USAGE_DIR_USE]
210 < debug_struct_generic[DINFO_USAGE_IND_USE])
211 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
212 " as much as %<-femit-struct-debug-detailed=ind:...%>");
216 /* Find the base name of a path, stripping off both directories and
217 a single final extension. */
218 static int
219 base_of_path (const char *path, const char **base_out)
221 const char *base = path;
222 const char *dot = 0;
223 const char *p = path;
224 char c = *p;
225 while (c)
227 if (IS_DIR_SEPARATOR(c))
229 base = p + 1;
230 dot = 0;
232 else if (c == '.')
233 dot = p;
234 c = *++p;
236 if (!dot)
237 dot = p;
238 *base_out = base;
239 return dot - base;
242 /* Match the base name of a file to the base name of a compilation unit. */
244 static const char *main_input_basename;
245 static int main_input_baselength;
247 static int
248 matches_main_base (const char *path)
250 /* Cache the last query. */
251 static const char *last_path = NULL;
252 static int last_match = 0;
253 if (path != last_path)
255 const char *base;
256 int length = base_of_path (path, &base);
257 last_path = path;
258 last_match = (length == main_input_baselength
259 && memcmp (base, main_input_basename, length) == 0);
261 return last_match;
264 #ifdef DEBUG_DEBUG_STRUCT
266 static int
267 dump_struct_debug (tree type, enum debug_info_usage usage,
268 enum debug_struct_file criterion, int generic,
269 int matches, int result)
271 /* Find the type name. */
272 tree type_decl = TYPE_STUB_DECL (type);
273 tree t = type_decl;
274 const char *name = 0;
275 if (TREE_CODE (t) == TYPE_DECL)
276 t = DECL_NAME (t);
277 if (t)
278 name = IDENTIFIER_POINTER (t);
280 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
281 criterion,
282 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
283 matches ? "bas" : "hdr",
284 generic ? "gen" : "ord",
285 usage == DINFO_USAGE_DFN ? ";" :
286 usage == DINFO_USAGE_DIR_USE ? "." : "*",
287 result,
288 (void*) type_decl, name);
289 return result;
291 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
292 dump_struct_debug (type, usage, criterion, generic, matches, result)
294 #else
296 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
297 (result)
299 #endif
302 bool
303 should_emit_struct_debug (tree type, enum debug_info_usage usage)
305 enum debug_struct_file criterion;
306 tree type_decl;
307 bool generic = lang_hooks.types.generic_p (type);
309 if (generic)
310 criterion = debug_struct_generic[usage];
311 else
312 criterion = debug_struct_ordinary[usage];
314 if (criterion == DINFO_STRUCT_FILE_NONE)
315 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
316 if (criterion == DINFO_STRUCT_FILE_ANY)
317 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
319 type_decl = TYPE_STUB_DECL (type);
321 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
322 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
324 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
325 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
326 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
329 /* Nonzero means use GNU-only extensions in the generated symbolic
330 debugging information. Currently, this only has an effect when
331 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
332 bool use_gnu_debug_info_extensions;
334 /* The default visibility for all symbols (unless overridden) */
335 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
337 /* Global visibility options. */
338 struct visibility_flags visibility_options;
340 /* What to print when a switch has no documentation. */
341 static const char undocumented_msg[] = N_("This switch lacks documentation");
343 /* Used for bookkeeping on whether user set these flags so
344 -fprofile-use/-fprofile-generate does not use them. */
345 static bool profile_arc_flag_set, flag_profile_values_set;
346 static bool flag_unroll_loops_set, flag_tracer_set;
347 static bool flag_value_profile_transformations_set;
348 static bool flag_peel_loops_set, flag_branch_probabilities_set;
349 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
350 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
352 /* Functions excluded from profiling. */
354 typedef char *char_p; /* For DEF_VEC_P. */
355 DEF_VEC_P(char_p);
356 DEF_VEC_ALLOC_P(char_p,heap);
358 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
359 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
361 typedef const char *const_char_p; /* For DEF_VEC_P. */
362 DEF_VEC_P(const_char_p);
363 DEF_VEC_ALLOC_P(const_char_p,heap);
365 static VEC(const_char_p,heap) *ignored_options;
367 /* Language specific warning pass for unused results. */
368 bool flag_warn_unused_result = false;
370 /* Input file names. */
371 const char **in_fnames;
372 unsigned num_in_fnames;
374 static int common_handle_option (size_t scode, const char *arg, int value,
375 unsigned int lang_mask);
376 static void handle_param (const char *);
377 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
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 handle_options (unsigned int, const char **, unsigned int);
382 static void set_debug_level (enum debug_info_type type, int extended,
383 const char *arg);
385 /* If ARG is a non-negative integer made up solely of digits, return its
386 value, otherwise return -1. */
387 static int
388 integral_argument (const char *arg)
390 const char *p = arg;
392 while (*p && ISDIGIT (*p))
393 p++;
395 if (*p == '\0')
396 return atoi (arg);
398 return -1;
401 /* Return a malloced slash-separated list of languages in MASK. */
402 static char *
403 write_langs (unsigned int mask)
405 unsigned int n = 0, len = 0;
406 const char *lang_name;
407 char *result;
409 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
410 if (mask & (1U << n))
411 len += strlen (lang_name) + 1;
413 result = XNEWVEC (char, len);
414 len = 0;
415 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
416 if (mask & (1U << n))
418 if (len)
419 result[len++] = '/';
420 strcpy (result + len, lang_name);
421 len += strlen (lang_name);
424 result[len] = 0;
426 return result;
429 /* Complain that switch OPT_INDEX does not apply to this front end. */
430 static void
431 complain_wrong_lang (const char *text, const struct cl_option *option,
432 unsigned int lang_mask)
434 char *ok_langs, *bad_lang;
436 /* The LTO front end inherits all the options from the first front
437 end that was used. However, not all the original front end
438 options make sense in LTO.
440 A real solution would be to filter this in collect2, but collect2
441 does not have access to all the option attributes to know what to
442 filter. So, in lto1 we silently accept inherited flags and do
443 nothing about it. */
444 if (lang_mask & CL_LTO)
445 return;
447 ok_langs = write_langs (option->flags);
448 bad_lang = write_langs (lang_mask);
450 /* Eventually this should become a hard error IMO. */
451 warning (0, "command line option \"%s\" is valid for %s but not for %s",
452 text, ok_langs, bad_lang);
454 free (ok_langs);
455 free (bad_lang);
458 /* Buffer the unknown option described by the string OPT. Currently,
459 we only complain about unknown -Wno-* options if they may have
460 prevented a diagnostic. Otherwise, we just ignore them.
461 Note that if we do complain, it is only as a warning, not an error;
462 passing the compiler an unrecognised -Wno-* option should never
463 change whether the compilation succeeds or fails. */
465 static void postpone_unknown_option_warning(const char *opt)
467 VEC_safe_push (const_char_p, heap, ignored_options, opt);
470 /* Produce a warning for each option previously buffered. */
472 void print_ignored_options (void)
474 location_t saved_loc = input_location;
476 input_location = 0;
478 while (!VEC_empty (const_char_p, ignored_options))
480 const char *opt;
481 opt = VEC_pop (const_char_p, ignored_options);
482 warning (0, "unrecognized command line option \"%s\"", opt);
485 input_location = saved_loc;
488 /* Handle the switch beginning at ARGV for the language indicated by
489 LANG_MASK. Returns the number of switches consumed. */
490 static unsigned int
491 handle_option (const char **argv, unsigned int lang_mask)
493 size_t opt_index;
494 const char *opt, *arg = 0;
495 char *dup = 0;
496 int value = 1;
497 unsigned int result = 0;
498 const struct cl_option *option;
500 opt = argv[0];
502 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
503 if (opt_index == cl_options_count
504 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
505 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
507 /* Drop the "no-" from negative switches. */
508 size_t len = strlen (opt) - 3;
510 dup = XNEWVEC (char, len + 1);
511 dup[0] = '-';
512 dup[1] = opt[1];
513 memcpy (dup + 2, opt + 5, len - 2 + 1);
514 opt = dup;
515 value = 0;
516 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
517 if (opt_index == cl_options_count && opt[1] == 'W')
519 /* We don't generate warnings for unknown -Wno-* options
520 unless we issue diagnostics. */
521 postpone_unknown_option_warning (argv[0]);
522 result = 1;
523 goto done;
527 if (opt_index == cl_options_count)
528 goto done;
530 option = &cl_options[opt_index];
532 /* Reject negative form of switches that don't take negatives as
533 unrecognized. */
534 if (!value && (option->flags & CL_REJECT_NEGATIVE))
535 goto done;
537 /* We've recognized this switch. */
538 result = 1;
540 /* Check to see if the option is disabled for this configuration. */
541 if (option->flags & CL_DISABLED)
543 error ("command line option %qs"
544 " is not supported by this configuration", opt);
545 goto done;
548 /* Sort out any argument the switch takes. */
549 if (option->flags & CL_JOINED)
551 /* Have arg point to the original switch. This is because
552 some code, such as disable_builtin_function, expects its
553 argument to be persistent until the program exits. */
554 arg = argv[0] + cl_options[opt_index].opt_len + 1;
555 if (!value)
556 arg += strlen ("no-");
558 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
560 if (option->flags & CL_SEPARATE)
562 arg = argv[1];
563 result = 2;
565 else
566 /* Missing argument. */
567 arg = NULL;
570 else if (option->flags & CL_SEPARATE)
572 arg = argv[1];
573 result = 2;
576 /* Now we've swallowed any potential argument, complain if this
577 is a switch for a different front end. */
578 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
580 complain_wrong_lang (argv[0], option, lang_mask);
581 goto done;
583 else if ((option->flags & CL_TARGET)
584 && (option->flags & CL_LANG_ALL)
585 && !(option->flags & lang_mask))
587 /* Complain for target flag language mismatches if any languages
588 are specified. */
589 complain_wrong_lang (argv[0], option, lang_mask);
590 goto done;
593 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
595 if (!lang_hooks.missing_argument (opt, opt_index))
596 error ("missing argument to \"%s\"", opt);
597 goto done;
600 /* If the switch takes an integer, convert it. */
601 if (arg && (option->flags & CL_UINTEGER))
603 value = integral_argument (arg);
604 if (value == -1)
606 error ("argument to \"%s\" should be a non-negative integer",
607 option->opt_text);
608 goto done;
612 if (option->flag_var)
613 set_option (option, value, arg);
615 if (option->flags & lang_mask)
617 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
618 result = 0;
619 else
620 lto_register_user_option (opt_index, arg, value, lang_mask);
623 if (result && (option->flags & CL_COMMON))
625 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
626 result = 0;
627 else
628 lto_register_user_option (opt_index, arg, value, CL_COMMON);
631 if (result && (option->flags & CL_TARGET))
633 if (!targetm.handle_option (opt_index, arg, value))
634 result = 0;
635 else
636 lto_register_user_option (opt_index, arg, value, CL_TARGET);
639 done:
640 if (dup)
641 free (dup);
642 return result;
645 /* Handle FILENAME from the command line. */
646 static void
647 add_input_filename (const char *filename)
649 num_in_fnames++;
650 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
651 in_fnames[num_in_fnames - 1] = filename;
654 /* Add comma-separated strings to a char_p vector. */
656 static void
657 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
659 char *tmp;
660 char *r;
661 char *w;
662 char *token_start;
664 /* We never free this string. */
665 tmp = xstrdup (arg);
667 r = tmp;
668 w = tmp;
669 token_start = tmp;
671 while (*r != '\0')
673 if (*r == ',')
675 *w++ = '\0';
676 ++r;
677 VEC_safe_push (char_p, heap, *pvec, token_start);
678 token_start = w;
680 if (*r == '\\' && r[1] == ',')
682 *w++ = ',';
683 r += 2;
685 else
686 *w++ = *r++;
688 if (*token_start != '\0')
689 VEC_safe_push (char_p, heap, *pvec, token_start);
692 /* Return whether we should exclude FNDECL from instrumentation. */
694 bool
695 flag_instrument_functions_exclude_p (tree fndecl)
697 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
699 const char *name;
700 int i;
701 char *s;
703 name = lang_hooks.decl_printable_name (fndecl, 0);
704 for (i = 0;
705 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
706 i, s);
707 ++i)
709 if (strstr (name, s) != NULL)
710 return true;
714 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
716 const char *name;
717 int i;
718 char *s;
720 name = DECL_SOURCE_FILE (fndecl);
721 for (i = 0;
722 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
723 ++i)
725 if (strstr (name, s) != NULL)
726 return true;
730 return false;
734 /* Decode and handle the vector of command line options. LANG_MASK
735 contains has a single bit set representing the current
736 language. */
737 static void
738 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
740 unsigned int n, i;
742 for (i = 1; i < argc; i += n)
744 const char *opt = argv[i];
746 /* Interpret "-" or a non-switch as a file name. */
747 if (opt[0] != '-' || opt[1] == '\0')
749 if (main_input_filename == NULL)
751 main_input_filename = opt;
752 main_input_baselength
753 = base_of_path (main_input_filename, &main_input_basename);
755 add_input_filename (opt);
756 n = 1;
757 continue;
760 n = handle_option (argv + i, lang_mask);
762 if (!n)
764 n = 1;
765 error ("unrecognized command line option \"%s\"", opt);
770 /* Parse command line options and set default flag values. Do minimal
771 options processing. */
772 void
773 decode_options (unsigned int argc, const char **argv)
775 static bool first_time_p = true;
776 static int initial_min_crossjump_insns;
777 static int initial_max_fields_for_field_sensitive;
778 static int initial_loop_invariant_max_bbs_in_loop;
779 static unsigned int initial_lang_mask;
781 unsigned int i, lang_mask;
782 int opt1;
783 int opt2;
784 int opt3;
785 int opt1_max;
787 if (first_time_p)
789 /* Perform language-specific options initialization. */
790 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
792 lang_hooks.initialize_diagnostics (global_dc);
794 /* Save initial values of parameters we reset. */
795 initial_min_crossjump_insns
796 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
797 initial_max_fields_for_field_sensitive
798 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
799 initial_loop_invariant_max_bbs_in_loop
800 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
802 else
803 lang_mask = initial_lang_mask;
805 /* Scan to see what optimization level has been specified. That will
806 determine the default value of many flags. */
807 for (i = 1; i < argc; i++)
809 if (!strcmp (argv[i], "-O"))
811 optimize = 1;
812 optimize_size = 0;
814 else if (argv[i][0] == '-' && argv[i][1] == 'O')
816 /* Handle -Os, -O2, -O3, -O69, ... */
817 const char *p = &argv[i][2];
819 if ((p[0] == 's') && (p[1] == 0))
821 optimize_size = 1;
823 /* Optimizing for size forces optimize to be 2. */
824 optimize = 2;
826 else
828 const int optimize_val = read_integral_parameter (p, p - 2, -1);
829 if (optimize_val != -1)
831 optimize = optimize_val;
832 if ((unsigned int) optimize > 255)
833 optimize = 255;
834 optimize_size = 0;
840 /* Use priority coloring if cover classes is not defined for the
841 target. */
842 if (targetm.ira_cover_classes == NULL)
843 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
845 /* -O1 optimizations. */
846 opt1 = (optimize >= 1);
847 flag_defer_pop = opt1;
848 #ifdef DELAY_SLOTS
849 flag_delayed_branch = opt1;
850 #endif
851 #ifdef CAN_DEBUG_WITHOUT_FP
852 flag_omit_frame_pointer = opt1;
853 #endif
854 flag_guess_branch_prob = opt1;
855 flag_cprop_registers = opt1;
856 flag_forward_propagate = opt1;
857 flag_if_conversion = opt1;
858 flag_if_conversion2 = opt1;
859 flag_ipa_pure_const = opt1;
860 flag_ipa_reference = opt1;
861 flag_ipa_profile = opt1;
862 flag_merge_constants = opt1;
863 flag_split_wide_types = opt1;
864 flag_tree_ccp = opt1;
865 flag_tree_dce = opt1;
866 flag_tree_dom = opt1;
867 flag_tree_dse = opt1;
868 flag_tree_ter = opt1;
869 flag_tree_sra = opt1;
870 flag_tree_copyrename = opt1;
871 flag_tree_fre = opt1;
872 flag_tree_copy_prop = opt1;
873 flag_tree_sink = opt1;
874 flag_tree_ch = opt1;
876 /* -O2 optimizations. */
877 opt2 = (optimize >= 2);
878 flag_inline_small_functions = opt2;
879 flag_indirect_inlining = opt2;
880 flag_thread_jumps = opt2;
881 flag_crossjumping = opt2;
882 flag_optimize_sibling_calls = opt2;
883 flag_cse_follow_jumps = opt2;
884 flag_gcse = opt2;
885 flag_expensive_optimizations = opt2;
886 flag_rerun_cse_after_loop = opt2;
887 flag_caller_saves = opt2;
888 flag_peephole2 = opt2;
889 #ifdef INSN_SCHEDULING
890 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
891 flag_schedule_insns = opt2 && ! optimize_size;
892 flag_schedule_insns_after_reload = opt2;
893 #endif
894 flag_regmove = opt2;
895 flag_strict_aliasing = opt2;
896 flag_strict_overflow = opt2;
897 flag_reorder_blocks = opt2;
898 flag_reorder_functions = opt2;
899 flag_tree_vrp = opt2;
900 flag_tree_builtin_call_dce = opt2;
901 flag_tree_pre = opt2;
902 flag_tree_switch_conversion = opt2;
903 flag_ipa_cp = opt2;
904 flag_ipa_sra = opt2;
906 /* Track fields in field-sensitive alias analysis. */
907 set_param_value ("max-fields-for-field-sensitive",
908 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
910 /* For -O1 only do loop invariant motion for very small loops. */
911 set_param_value ("loop-invariant-max-bbs-in-loop",
912 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
914 /* -O3 optimizations. */
915 opt3 = (optimize >= 3);
916 flag_predictive_commoning = opt3;
917 flag_inline_functions = opt3;
918 flag_unswitch_loops = opt3;
919 flag_gcse_after_reload = opt3;
920 flag_tree_vectorize = opt3;
921 flag_ipa_cp_clone = opt3;
922 if (flag_ipa_cp_clone)
923 flag_ipa_cp = 1;
925 /* Just -O1/-O0 optimizations. */
926 opt1_max = (optimize <= 1);
927 align_loops = opt1_max;
928 align_jumps = opt1_max;
929 align_labels = opt1_max;
930 align_functions = opt1_max;
932 if (optimize_size)
934 /* Inlining of functions reducing size is a good idea regardless of them
935 being declared inline. */
936 flag_inline_functions = 1;
938 /* Basic optimization options. */
939 optimize_size = 1;
940 if (optimize > 2)
941 optimize = 2;
943 /* We want to crossjump as much as possible. */
944 set_param_value ("min-crossjump-insns", 1);
946 else
947 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
949 if (first_time_p)
951 /* Initialize whether `char' is signed. */
952 flag_signed_char = DEFAULT_SIGNED_CHAR;
953 /* Set this to a special "uninitialized" value. The actual default is
954 set after target options have been processed. */
955 flag_short_enums = 2;
957 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
958 modify it. */
959 target_flags = targetm.default_target_flags;
961 /* Some targets have ABI-specified unwind tables. */
962 flag_unwind_tables = targetm.unwind_tables_default;
965 /* Clear any options currently held for LTO. */
966 lto_clear_user_options ();
968 #ifdef OPTIMIZATION_OPTIONS
969 /* Allow default optimizations to be specified on a per-machine basis. */
970 OPTIMIZATION_OPTIONS (optimize, optimize_size);
971 #endif
973 handle_options (argc, argv, lang_mask);
975 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
977 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
978 directory. Then try to make DUMP_BASE_NAME relative to the
979 AUX_BASE_NAME directory, typically the directory to contain
980 the object file. */
981 if (dump_dir_name)
982 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
983 else if (aux_base_name)
985 const char *aux_base;
987 base_of_path (aux_base_name, &aux_base);
988 if (aux_base_name != aux_base)
990 int dir_len = aux_base - aux_base_name;
991 char *new_dump_base_name =
992 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
994 /* Copy directory component from AUX_BASE_NAME. */
995 memcpy (new_dump_base_name, aux_base_name, dir_len);
996 /* Append existing DUMP_BASE_NAME. */
997 strcpy (new_dump_base_name + dir_len, dump_base_name);
998 dump_base_name = new_dump_base_name;
1003 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1004 section-anchors. */
1005 if (!flag_unit_at_a_time)
1007 if (flag_section_anchors == 1)
1008 error ("Section anchors must be disabled when unit-at-a-time "
1009 "is disabled.");
1010 flag_section_anchors = 0;
1011 if (flag_toplevel_reorder == 1)
1012 error ("Toplevel reorder must be disabled when unit-at-a-time "
1013 "is disabled.");
1014 flag_toplevel_reorder = 0;
1016 /* Unless the user has asked for section anchors, we disable toplevel
1017 reordering at -O0 to disable transformations that might be surprising
1018 to end users and to get -fno-toplevel-reorder tested. */
1019 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1021 flag_toplevel_reorder = 0;
1022 flag_section_anchors = 0;
1024 if (!flag_toplevel_reorder)
1026 if (flag_section_anchors == 1)
1027 error ("section anchors must be disabled when toplevel reorder"
1028 " is disabled");
1029 flag_section_anchors = 0;
1032 if (first_time_p)
1034 if (flag_pie)
1035 flag_pic = flag_pie;
1036 if (flag_pic && !flag_pie)
1037 flag_shlib = 1;
1038 first_time_p = false;
1041 if (optimize == 0)
1043 /* Inlining does not work if not optimizing,
1044 so force it not to be done. */
1045 warn_inline = 0;
1046 flag_no_inline = 1;
1049 /* The optimization to partition hot and cold basic blocks into separate
1050 sections of the .o and executable files does not work (currently)
1051 with exception handling. This is because there is no support for
1052 generating unwind info. If flag_exceptions is turned on we need to
1053 turn off the partitioning optimization. */
1055 if (flag_exceptions && flag_reorder_blocks_and_partition
1056 && (USING_SJLJ_EXCEPTIONS
1057 #ifdef TARGET_UNWIND_INFO
1058 || 1
1059 #endif
1062 inform (input_location,
1063 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1064 flag_reorder_blocks_and_partition = 0;
1065 flag_reorder_blocks = 1;
1068 /* If user requested unwind info, then turn off the partitioning
1069 optimization. */
1071 if (flag_unwind_tables && ! targetm.unwind_tables_default
1072 && flag_reorder_blocks_and_partition
1073 && (USING_SJLJ_EXCEPTIONS
1074 #ifdef TARGET_UNWIND_INFO
1075 || 1
1076 #endif
1079 inform (input_location,
1080 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1081 flag_reorder_blocks_and_partition = 0;
1082 flag_reorder_blocks = 1;
1085 /* If the target requested unwind info, then turn off the partitioning
1086 optimization with a different message. Likewise, if the target does not
1087 support named sections. */
1089 if (flag_reorder_blocks_and_partition
1090 && (!targetm.have_named_sections
1091 || (flag_unwind_tables && targetm.unwind_tables_default
1092 && (USING_SJLJ_EXCEPTIONS
1093 #ifdef TARGET_UNWIND_INFO
1094 || 1
1095 #endif
1096 ))))
1098 inform (input_location,
1099 "-freorder-blocks-and-partition does not work on this architecture");
1100 flag_reorder_blocks_and_partition = 0;
1101 flag_reorder_blocks = 1;
1104 /* Pipelining of outer loops is only possible when general pipelining
1105 capabilities are requested. */
1106 if (!flag_sel_sched_pipelining)
1107 flag_sel_sched_pipelining_outer_loops = 0;
1109 if (!targetm.ira_cover_classes
1110 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1112 inform (input_location,
1113 "-fira-algorithm=CB does not work on this architecture");
1114 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1117 if (flag_conserve_stack)
1119 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1120 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1121 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1122 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1124 if (flag_wpa || flag_ltrans)
1126 /* These passes are not WHOPR compatible yet. */
1127 flag_ipa_cp = 0;
1128 flag_ipa_reference = 0;
1129 flag_ipa_type_escape = 0;
1130 flag_ipa_pta = 0;
1131 flag_ipa_struct_reorg = 0;
1134 if (flag_lto || flag_whopr)
1136 #ifdef ENABLE_LTO
1137 flag_generate_lto = 1;
1139 /* When generating IL, do not operate in whole-program mode.
1140 Otherwise, symbols will be privatized too early, causing link
1141 errors later. */
1142 flag_whole_program = 0;
1143 #else
1144 error ("LTO support has not been enabled in this configuration");
1145 #endif
1148 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1149 check option consistency. */
1150 if (flag_lto && flag_whopr)
1151 error ("-flto and -fwhopr are mutually exclusive");
1154 #define LEFT_COLUMN 27
1156 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1157 followed by word-wrapped HELP in a second column. */
1158 static void
1159 wrap_help (const char *help,
1160 const char *item,
1161 unsigned int item_width,
1162 unsigned int columns)
1164 unsigned int col_width = LEFT_COLUMN;
1165 unsigned int remaining, room, len;
1167 remaining = strlen (help);
1171 room = columns - 3 - MAX (col_width, item_width);
1172 if (room > columns)
1173 room = 0;
1174 len = remaining;
1176 if (room < len)
1178 unsigned int i;
1180 for (i = 0; help[i]; i++)
1182 if (i >= room && len != remaining)
1183 break;
1184 if (help[i] == ' ')
1185 len = i;
1186 else if ((help[i] == '-' || help[i] == '/')
1187 && help[i + 1] != ' '
1188 && i > 0 && ISALPHA (help[i - 1]))
1189 len = i + 1;
1193 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1194 item_width = 0;
1195 while (help[len] == ' ')
1196 len++;
1197 help += len;
1198 remaining -= len;
1200 while (remaining);
1203 /* Print help for a specific front-end, etc. */
1204 static void
1205 print_filtered_help (unsigned int include_flags,
1206 unsigned int exclude_flags,
1207 unsigned int any_flags,
1208 unsigned int columns)
1210 unsigned int i;
1211 const char *help;
1212 static char *printed = NULL;
1213 bool found = false;
1214 bool displayed = false;
1216 if (include_flags == CL_PARAMS)
1218 for (i = 0; i < LAST_PARAM; i++)
1220 const char *param = compiler_params[i].option;
1222 help = compiler_params[i].help;
1223 if (help == NULL || *help == '\0')
1225 if (exclude_flags & CL_UNDOCUMENTED)
1226 continue;
1227 help = undocumented_msg;
1230 /* Get the translation. */
1231 help = _(help);
1233 wrap_help (help, param, strlen (param), columns);
1235 putchar ('\n');
1236 return;
1239 if (!printed)
1240 printed = XCNEWVAR (char, cl_options_count);
1242 for (i = 0; i < cl_options_count; i++)
1244 static char new_help[128];
1245 const struct cl_option *option = cl_options + i;
1246 unsigned int len;
1247 const char *opt;
1248 const char *tab;
1250 if (include_flags == 0
1251 || ((option->flags & include_flags) != include_flags))
1253 if ((option->flags & any_flags) == 0)
1254 continue;
1257 /* Skip unwanted switches. */
1258 if ((option->flags & exclude_flags) != 0)
1259 continue;
1261 found = true;
1262 /* Skip switches that have already been printed. */
1263 if (printed[i])
1264 continue;
1266 printed[i] = true;
1268 help = option->help;
1269 if (help == NULL)
1271 if (exclude_flags & CL_UNDOCUMENTED)
1272 continue;
1273 help = undocumented_msg;
1276 /* Get the translation. */
1277 help = _(help);
1279 /* Find the gap between the name of the
1280 option and its descriptive text. */
1281 tab = strchr (help, '\t');
1282 if (tab)
1284 len = tab - help;
1285 opt = help;
1286 help = tab + 1;
1288 else
1290 opt = option->opt_text;
1291 len = strlen (opt);
1294 /* With the -Q option enabled we change the descriptive text associated
1295 with an option to be an indication of its current setting. */
1296 if (!quiet_flag)
1298 if (len < (LEFT_COLUMN + 2))
1299 strcpy (new_help, "\t\t");
1300 else
1301 strcpy (new_help, "\t");
1303 if (option->flag_var != NULL)
1305 if (option->flags & CL_JOINED)
1307 if (option->var_type == CLVC_STRING)
1309 if (* (const char **) option->flag_var != NULL)
1310 snprintf (new_help + strlen (new_help),
1311 sizeof (new_help) - strlen (new_help),
1312 * (const char **) option->flag_var);
1314 else
1315 sprintf (new_help + strlen (new_help),
1316 "%#x", * (int *) option->flag_var);
1318 else
1319 strcat (new_help, option_enabled (i)
1320 ? _("[enabled]") : _("[disabled]"));
1323 help = new_help;
1326 wrap_help (help, opt, len, columns);
1327 displayed = true;
1330 if (! found)
1332 unsigned int langs = include_flags & CL_LANG_ALL;
1334 if (langs == 0)
1335 printf (_(" No options with the desired characteristics were found\n"));
1336 else
1338 unsigned int i;
1340 /* PR 31349: Tell the user how to see all of the
1341 options supported by a specific front end. */
1342 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1343 if ((1U << i) & langs)
1344 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1345 lang_names[i], lang_names[i]);
1349 else if (! displayed)
1350 printf (_(" All options with the desired characteristics have already been displayed\n"));
1352 putchar ('\n');
1355 /* Display help for a specified type of option.
1356 The options must have ALL of the INCLUDE_FLAGS set
1357 ANY of the flags in the ANY_FLAGS set
1358 and NONE of the EXCLUDE_FLAGS set. */
1359 static void
1360 print_specific_help (unsigned int include_flags,
1361 unsigned int exclude_flags,
1362 unsigned int any_flags)
1364 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1365 const char * description = NULL;
1366 const char * descrip_extra = "";
1367 size_t i;
1368 unsigned int flag;
1369 static unsigned int columns = 0;
1371 /* Sanity check: Make sure that we do not have more
1372 languages than we have bits available to enumerate them. */
1373 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1375 /* If we have not done so already, obtain
1376 the desired maximum width of the output. */
1377 if (columns == 0)
1379 const char *p;
1381 GET_ENVIRONMENT (p, "COLUMNS");
1382 if (p != NULL)
1384 int value = atoi (p);
1386 if (value > 0)
1387 columns = value;
1390 if (columns == 0)
1391 /* Use a reasonable default. */
1392 columns = 80;
1395 /* Decide upon the title for the options that we are going to display. */
1396 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1398 switch (flag & include_flags)
1400 case 0:
1401 break;
1403 case CL_TARGET:
1404 description = _("The following options are target specific");
1405 break;
1406 case CL_WARNING:
1407 description = _("The following options control compiler warning messages");
1408 break;
1409 case CL_OPTIMIZATION:
1410 description = _("The following options control optimizations");
1411 break;
1412 case CL_COMMON:
1413 description = _("The following options are language-independent");
1414 break;
1415 case CL_PARAMS:
1416 description = _("The --param option recognizes the following as parameters");
1417 break;
1418 default:
1419 if (i >= cl_lang_count)
1420 break;
1421 if (exclude_flags & all_langs_mask)
1422 description = _("The following options are specific to just the language ");
1423 else
1424 description = _("The following options are supported by the language ");
1425 descrip_extra = lang_names [i];
1426 break;
1430 if (description == NULL)
1432 if (any_flags == 0)
1434 if (include_flags & CL_UNDOCUMENTED)
1435 description = _("The following options are not documented");
1436 else if (include_flags & CL_SEPARATE)
1437 description = _("The following options take separate arguments");
1438 else if (include_flags & CL_JOINED)
1439 description = _("The following options take joined arguments");
1440 else
1442 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1443 include_flags);
1444 return;
1447 else
1449 if (any_flags & all_langs_mask)
1450 description = _("The following options are language-related");
1451 else
1452 description = _("The following options are language-independent");
1456 printf ("%s%s:\n", description, descrip_extra);
1457 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1460 /* Handle target- and language-independent options. Return zero to
1461 generate an "unknown option" message. Only options that need
1462 extra handling need to be listed here; if you simply want
1463 VALUE assigned to a variable, it happens automatically. */
1465 static int
1466 common_handle_option (size_t scode, const char *arg, int value,
1467 unsigned int lang_mask)
1469 static bool verbose = false;
1470 enum opt_code code = (enum opt_code) scode;
1472 switch (code)
1474 case OPT__param:
1475 handle_param (arg);
1476 break;
1478 case OPT_v:
1479 verbose = true;
1480 break;
1482 case OPT_fhelp:
1483 case OPT__help:
1485 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1486 unsigned int undoc_mask;
1487 unsigned int i;
1489 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1490 /* First display any single language specific options. */
1491 for (i = 0; i < cl_lang_count; i++)
1492 print_specific_help
1493 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1494 /* Next display any multi language specific options. */
1495 print_specific_help (0, undoc_mask, all_langs_mask);
1496 /* Then display any remaining, non-language options. */
1497 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1498 print_specific_help (i, undoc_mask, 0);
1499 exit_after_options = true;
1500 break;
1503 case OPT_ftarget_help:
1504 case OPT__target_help:
1505 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1506 exit_after_options = true;
1508 /* Allow the target a chance to give the user some additional information. */
1509 if (targetm.target_help)
1510 targetm.target_help ();
1511 break;
1513 case OPT_fhelp_:
1514 case OPT__help_:
1516 const char * a = arg;
1517 unsigned int include_flags = 0;
1518 /* Note - by default we include undocumented options when listing
1519 specific classes. If you only want to see documented options
1520 then add ",^undocumented" to the --help= option. E.g.:
1522 --help=target,^undocumented */
1523 unsigned int exclude_flags = 0;
1525 /* Walk along the argument string, parsing each word in turn.
1526 The format is:
1527 arg = [^]{word}[,{arg}]
1528 word = {optimizers|target|warnings|undocumented|
1529 params|common|<language>} */
1530 while (* a != 0)
1532 static struct
1534 const char * string;
1535 unsigned int flag;
1537 specifics[] =
1539 { "optimizers", CL_OPTIMIZATION },
1540 { "target", CL_TARGET },
1541 { "warnings", CL_WARNING },
1542 { "undocumented", CL_UNDOCUMENTED },
1543 { "params", CL_PARAMS },
1544 { "joined", CL_JOINED },
1545 { "separate", CL_SEPARATE },
1546 { "common", CL_COMMON },
1547 { NULL, 0 }
1549 unsigned int * pflags;
1550 const char * comma;
1551 unsigned int lang_flag, specific_flag;
1552 unsigned int len;
1553 unsigned int i;
1555 if (* a == '^')
1557 ++ a;
1558 pflags = & exclude_flags;
1560 else
1561 pflags = & include_flags;
1563 comma = strchr (a, ',');
1564 if (comma == NULL)
1565 len = strlen (a);
1566 else
1567 len = comma - a;
1568 if (len == 0)
1570 a = comma + 1;
1571 continue;
1574 /* Check to see if the string matches an option class name. */
1575 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1576 if (strncasecmp (a, specifics[i].string, len) == 0)
1578 specific_flag = specifics[i].flag;
1579 break;
1582 /* Check to see if the string matches a language name.
1583 Note - we rely upon the alpha-sorted nature of the entries in
1584 the lang_names array, specifically that shorter names appear
1585 before their longer variants. (i.e. C before C++). That way
1586 when we are attempting to match --help=c for example we will
1587 match with C first and not C++. */
1588 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1589 if (strncasecmp (a, lang_names[i], len) == 0)
1591 lang_flag = 1U << i;
1592 break;
1595 if (specific_flag != 0)
1597 if (lang_flag == 0)
1598 * pflags |= specific_flag;
1599 else
1601 /* The option's argument matches both the start of a
1602 language name and the start of an option class name.
1603 We have a special case for when the user has
1604 specified "--help=c", but otherwise we have to issue
1605 a warning. */
1606 if (strncasecmp (a, "c", len) == 0)
1607 * pflags |= lang_flag;
1608 else
1609 fnotice (stderr,
1610 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1611 len, a);
1614 else if (lang_flag != 0)
1615 * pflags |= lang_flag;
1616 else
1617 fnotice (stderr,
1618 "warning: unrecognized argument to --help= option: %.*s\n",
1619 len, a);
1621 if (comma == NULL)
1622 break;
1623 a = comma + 1;
1626 if (include_flags)
1627 print_specific_help (include_flags, exclude_flags, 0);
1628 exit_after_options = true;
1629 break;
1632 case OPT_fversion:
1633 case OPT__version:
1634 exit_after_options = true;
1635 break;
1637 case OPT_G:
1638 g_switch_value = value;
1639 g_switch_set = true;
1640 break;
1642 case OPT_O:
1643 case OPT_Os:
1644 /* Currently handled in a prescan. */
1645 break;
1647 case OPT_Werror_:
1648 enable_warning_as_error (arg, value, lang_mask);
1649 break;
1651 case OPT_Wlarger_than_:
1652 /* This form corresponds to -Wlarger-than-.
1653 Kept for backward compatibility.
1654 Don't use it as the first argument of warning(). */
1656 case OPT_Wlarger_than_eq:
1657 larger_than_size = value;
1658 warn_larger_than = value != -1;
1659 break;
1661 case OPT_Wframe_larger_than_:
1662 frame_larger_than_size = value;
1663 warn_frame_larger_than = value != -1;
1664 break;
1666 case OPT_Wstrict_aliasing:
1667 set_Wstrict_aliasing (value);
1668 break;
1670 case OPT_Wstrict_aliasing_:
1671 warn_strict_aliasing = value;
1672 break;
1674 case OPT_Wstrict_overflow:
1675 warn_strict_overflow = (value
1676 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1677 : 0);
1678 break;
1680 case OPT_Wstrict_overflow_:
1681 warn_strict_overflow = value;
1682 break;
1684 case OPT_Wunused:
1685 warn_unused = value;
1686 break;
1688 case OPT_aux_info:
1689 case OPT_aux_info_:
1690 aux_info_file_name = arg;
1691 flag_gen_aux_info = 1;
1692 break;
1694 case OPT_auxbase:
1695 aux_base_name = arg;
1696 break;
1698 case OPT_auxbase_strip:
1700 char *tmp = xstrdup (arg);
1701 strip_off_ending (tmp, strlen (tmp));
1702 if (tmp[0])
1703 aux_base_name = tmp;
1705 break;
1707 case OPT_d:
1708 decode_d_option (arg);
1709 break;
1711 case OPT_dumpbase:
1712 dump_base_name = arg;
1713 break;
1715 case OPT_dumpdir:
1716 dump_dir_name = arg;
1717 break;
1719 case OPT_falign_functions_:
1720 align_functions = value;
1721 break;
1723 case OPT_falign_jumps_:
1724 align_jumps = value;
1725 break;
1727 case OPT_falign_labels_:
1728 align_labels = value;
1729 break;
1731 case OPT_falign_loops_:
1732 align_loops = value;
1733 break;
1735 case OPT_fbranch_probabilities:
1736 flag_branch_probabilities_set = true;
1737 break;
1739 case OPT_fcall_used_:
1740 fix_register (arg, 0, 1);
1741 break;
1743 case OPT_fcall_saved_:
1744 fix_register (arg, 0, 0);
1745 break;
1747 case OPT_fdbg_cnt_:
1748 dbg_cnt_process_opt (arg);
1749 break;
1751 case OPT_fdbg_cnt_list:
1752 dbg_cnt_list_all_counters ();
1753 break;
1755 case OPT_fdebug_prefix_map_:
1756 add_debug_prefix_map (arg);
1757 break;
1759 case OPT_fdiagnostics_show_location_:
1760 if (!strcmp (arg, "once"))
1761 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1762 else if (!strcmp (arg, "every-line"))
1763 diagnostic_prefixing_rule (global_dc)
1764 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1765 else
1766 return 0;
1767 break;
1769 case OPT_fdiagnostics_show_option:
1770 global_dc->show_option_requested = value;
1771 break;
1773 case OPT_fdump_:
1774 if (!dump_switch_p (arg))
1775 return 0;
1776 break;
1778 case OPT_fexcess_precision_:
1779 if (!strcmp (arg, "fast"))
1780 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1781 else if (!strcmp (arg, "standard"))
1782 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1783 else
1784 error ("unknown excess precision style \"%s\"", arg);
1785 break;
1787 case OPT_ffast_math:
1788 set_fast_math_flags (value);
1789 break;
1791 case OPT_funsafe_math_optimizations:
1792 set_unsafe_math_optimizations_flags (value);
1793 break;
1795 case OPT_ffixed_:
1796 fix_register (arg, 1, 1);
1797 break;
1799 case OPT_finline_limit_:
1800 case OPT_finline_limit_eq:
1801 set_param_value ("max-inline-insns-single", value / 2);
1802 set_param_value ("max-inline-insns-auto", value / 2);
1803 break;
1805 case OPT_finstrument_functions_exclude_function_list_:
1806 add_comma_separated_to_vector
1807 (&flag_instrument_functions_exclude_functions, arg);
1808 break;
1810 case OPT_finstrument_functions_exclude_file_list_:
1811 add_comma_separated_to_vector
1812 (&flag_instrument_functions_exclude_files, arg);
1813 break;
1815 case OPT_fmessage_length_:
1816 pp_set_line_maximum_length (global_dc->printer, value);
1817 break;
1819 case OPT_fpack_struct_:
1820 if (value <= 0 || (value & (value - 1)) || value > 16)
1821 error ("structure alignment must be a small power of two, not %d", value);
1822 else
1824 initial_max_fld_align = value;
1825 maximum_field_alignment = value * BITS_PER_UNIT;
1827 break;
1829 case OPT_fpeel_loops:
1830 flag_peel_loops_set = true;
1831 break;
1833 case OPT_fplugin_:
1834 #ifdef ENABLE_PLUGIN
1835 add_new_plugin (arg);
1836 #else
1837 error ("Plugin support is disabled. Configure with --enable-plugin.");
1838 #endif
1839 break;
1841 case OPT_fplugin_arg_:
1842 #ifdef ENABLE_PLUGIN
1843 parse_plugin_arg_opt (arg);
1844 #else
1845 error ("Plugin support is disabled. Configure with --enable-plugin.");
1846 #endif
1847 break;
1849 case OPT_fprofile_arcs:
1850 profile_arc_flag_set = true;
1851 break;
1853 case OPT_finline_functions:
1854 flag_inline_functions_set = true;
1855 break;
1857 case OPT_fprofile_dir_:
1858 profile_data_prefix = xstrdup (arg);
1859 break;
1861 case OPT_fprofile_use_:
1862 profile_data_prefix = xstrdup (arg);
1863 flag_profile_use = true;
1864 value = true;
1865 /* No break here - do -fprofile-use processing. */
1866 case OPT_fprofile_use:
1867 if (!flag_branch_probabilities_set)
1868 flag_branch_probabilities = value;
1869 if (!flag_profile_values_set)
1870 flag_profile_values = value;
1871 if (!flag_unroll_loops_set)
1872 flag_unroll_loops = value;
1873 if (!flag_peel_loops_set)
1874 flag_peel_loops = value;
1875 if (!flag_tracer_set)
1876 flag_tracer = value;
1877 if (!flag_value_profile_transformations_set)
1878 flag_value_profile_transformations = value;
1879 if (!flag_inline_functions_set)
1880 flag_inline_functions = value;
1881 if (!flag_ipa_cp_set)
1882 flag_ipa_cp = value;
1883 if (!flag_ipa_cp_clone_set
1884 && value && flag_ipa_cp)
1885 flag_ipa_cp_clone = value;
1886 if (!flag_predictive_commoning_set)
1887 flag_predictive_commoning = value;
1888 if (!flag_unswitch_loops_set)
1889 flag_unswitch_loops = value;
1890 if (!flag_gcse_after_reload_set)
1891 flag_gcse_after_reload = value;
1892 break;
1894 case OPT_fprofile_generate_:
1895 profile_data_prefix = xstrdup (arg);
1896 value = true;
1897 /* No break here - do -fprofile-generate processing. */
1898 case OPT_fprofile_generate:
1899 if (!profile_arc_flag_set)
1900 profile_arc_flag = value;
1901 if (!flag_profile_values_set)
1902 flag_profile_values = value;
1903 if (!flag_value_profile_transformations_set)
1904 flag_value_profile_transformations = value;
1905 if (!flag_inline_functions_set)
1906 flag_inline_functions = value;
1907 break;
1909 case OPT_fprofile_values:
1910 flag_profile_values_set = true;
1911 break;
1913 case OPT_fvisibility_:
1915 if (!strcmp(arg, "default"))
1916 default_visibility = VISIBILITY_DEFAULT;
1917 else if (!strcmp(arg, "internal"))
1918 default_visibility = VISIBILITY_INTERNAL;
1919 else if (!strcmp(arg, "hidden"))
1920 default_visibility = VISIBILITY_HIDDEN;
1921 else if (!strcmp(arg, "protected"))
1922 default_visibility = VISIBILITY_PROTECTED;
1923 else
1924 error ("unrecognized visibility value \"%s\"", arg);
1926 break;
1928 case OPT_fvpt:
1929 flag_value_profile_transformations_set = true;
1930 break;
1932 case OPT_frandom_seed:
1933 /* The real switch is -fno-random-seed. */
1934 if (value)
1935 return 0;
1936 set_random_seed (NULL);
1937 break;
1939 case OPT_frandom_seed_:
1940 set_random_seed (arg);
1941 break;
1943 case OPT_fselective_scheduling:
1944 case OPT_fselective_scheduling2:
1945 sel_sched_switch_set = true;
1946 break;
1948 case OPT_fsched_verbose_:
1949 #ifdef INSN_SCHEDULING
1950 fix_sched_param ("verbose", arg);
1951 break;
1952 #else
1953 return 0;
1954 #endif
1956 case OPT_fsched_stalled_insns_:
1957 flag_sched_stalled_insns = value;
1958 if (flag_sched_stalled_insns == 0)
1959 flag_sched_stalled_insns = -1;
1960 break;
1962 case OPT_fsched_stalled_insns_dep_:
1963 flag_sched_stalled_insns_dep = value;
1964 break;
1966 case OPT_fstack_check_:
1967 if (!strcmp (arg, "no"))
1968 flag_stack_check = NO_STACK_CHECK;
1969 else if (!strcmp (arg, "generic"))
1970 /* This is the old stack checking method. */
1971 flag_stack_check = STACK_CHECK_BUILTIN
1972 ? FULL_BUILTIN_STACK_CHECK
1973 : GENERIC_STACK_CHECK;
1974 else if (!strcmp (arg, "specific"))
1975 /* This is the new stack checking method. */
1976 flag_stack_check = STACK_CHECK_BUILTIN
1977 ? FULL_BUILTIN_STACK_CHECK
1978 : STACK_CHECK_STATIC_BUILTIN
1979 ? STATIC_BUILTIN_STACK_CHECK
1980 : GENERIC_STACK_CHECK;
1981 else
1982 warning (0, "unknown stack check parameter \"%s\"", arg);
1983 break;
1985 case OPT_fstack_check:
1986 /* This is the same as the "specific" mode above. */
1987 if (value)
1988 flag_stack_check = STACK_CHECK_BUILTIN
1989 ? FULL_BUILTIN_STACK_CHECK
1990 : STACK_CHECK_STATIC_BUILTIN
1991 ? STATIC_BUILTIN_STACK_CHECK
1992 : GENERIC_STACK_CHECK;
1993 else
1994 flag_stack_check = NO_STACK_CHECK;
1995 break;
1997 case OPT_fstack_limit:
1998 /* The real switch is -fno-stack-limit. */
1999 if (value)
2000 return 0;
2001 stack_limit_rtx = NULL_RTX;
2002 break;
2004 case OPT_fstack_limit_register_:
2006 int reg = decode_reg_name (arg);
2007 if (reg < 0)
2008 error ("unrecognized register name \"%s\"", arg);
2009 else
2010 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2012 break;
2014 case OPT_fstack_limit_symbol_:
2015 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2016 break;
2018 case OPT_ftree_vectorizer_verbose_:
2019 vect_set_verbosity_level (arg);
2020 break;
2022 case OPT_ftls_model_:
2023 if (!strcmp (arg, "global-dynamic"))
2024 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2025 else if (!strcmp (arg, "local-dynamic"))
2026 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2027 else if (!strcmp (arg, "initial-exec"))
2028 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2029 else if (!strcmp (arg, "local-exec"))
2030 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2031 else
2032 warning (0, "unknown tls-model \"%s\"", arg);
2033 break;
2035 case OPT_fira_algorithm_:
2036 if (!strcmp (arg, "CB"))
2037 flag_ira_algorithm = IRA_ALGORITHM_CB;
2038 else if (!strcmp (arg, "priority"))
2039 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2040 else
2041 warning (0, "unknown ira algorithm \"%s\"", arg);
2042 break;
2044 case OPT_fira_region_:
2045 if (!strcmp (arg, "one"))
2046 flag_ira_region = IRA_REGION_ONE;
2047 else if (!strcmp (arg, "all"))
2048 flag_ira_region = IRA_REGION_ALL;
2049 else if (!strcmp (arg, "mixed"))
2050 flag_ira_region = IRA_REGION_MIXED;
2051 else
2052 warning (0, "unknown ira region \"%s\"", arg);
2053 break;
2055 case OPT_fira_verbose_:
2056 flag_ira_verbose = value;
2057 break;
2059 case OPT_ftracer:
2060 flag_tracer_set = true;
2061 break;
2063 case OPT_fipa_cp:
2064 flag_ipa_cp_set = true;
2065 break;
2067 case OPT_fipa_cp_clone:
2068 flag_ipa_cp_clone_set = true;
2069 break;
2071 case OPT_fpredictive_commoning:
2072 flag_predictive_commoning_set = true;
2073 break;
2075 case OPT_funswitch_loops:
2076 flag_unswitch_loops_set = true;
2077 break;
2079 case OPT_fgcse_after_reload:
2080 flag_gcse_after_reload_set = true;
2081 break;
2083 case OPT_funroll_loops:
2084 flag_unroll_loops_set = true;
2085 break;
2087 case OPT_g:
2088 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2089 break;
2091 case OPT_gcoff:
2092 set_debug_level (SDB_DEBUG, false, arg);
2093 break;
2095 case OPT_gdwarf_:
2096 if (value < 2 || value > 4)
2097 error ("dwarf version %d is not supported", value);
2098 else
2099 dwarf_version = value;
2100 set_debug_level (DWARF2_DEBUG, false, "");
2101 break;
2103 case OPT_ggdb:
2104 set_debug_level (NO_DEBUG, 2, arg);
2105 break;
2107 case OPT_gstabs:
2108 case OPT_gstabs_:
2109 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2110 break;
2112 case OPT_gvms:
2113 set_debug_level (VMS_DEBUG, false, arg);
2114 break;
2116 case OPT_gxcoff:
2117 case OPT_gxcoff_:
2118 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2119 break;
2121 case OPT_o:
2122 asm_file_name = arg;
2123 break;
2125 case OPT_pedantic_errors:
2126 flag_pedantic_errors = pedantic = 1;
2127 break;
2129 case OPT_fsee:
2130 case OPT_fcse_skip_blocks:
2131 case OPT_floop_optimize:
2132 case OPT_frerun_loop_opt:
2133 case OPT_fsched2_use_traces:
2134 case OPT_fstrength_reduce:
2135 case OPT_ftree_store_copy_prop:
2136 case OPT_fforce_addr:
2137 case OPT_ftree_salias:
2138 case OPT_ftree_store_ccp:
2139 case OPT_Wunreachable_code:
2140 case OPT_fargument_alias:
2141 case OPT_fargument_noalias:
2142 case OPT_fargument_noalias_anything:
2143 case OPT_fargument_noalias_global:
2144 /* These are no-ops, preserved for backward compatibility. */
2145 break;
2147 case OPT_fuse_linker_plugin:
2148 /* No-op. Used by the driver and passed to us because it starts with f.*/
2149 break;
2151 default:
2152 /* If the flag was handled in a standard way, assume the lack of
2153 processing here is intentional. */
2154 gcc_assert (cl_options[scode].flag_var);
2155 break;
2158 return 1;
2161 /* Handle --param NAME=VALUE. */
2162 static void
2163 handle_param (const char *carg)
2165 char *equal, *arg;
2166 int value;
2168 arg = xstrdup (carg);
2169 equal = strchr (arg, '=');
2170 if (!equal)
2171 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2172 else
2174 value = integral_argument (equal + 1);
2175 if (value == -1)
2176 error ("invalid --param value %qs", equal + 1);
2177 else
2179 *equal = '\0';
2180 set_param_value (arg, value);
2184 free (arg);
2187 /* Used to set the level of strict aliasing warnings,
2188 when no level is specified (i.e., when -Wstrict-aliasing, and not
2189 -Wstrict-aliasing=level was given).
2190 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2191 and 0 otherwise. After calling this function, wstrict_aliasing will be
2192 set to the default value of -Wstrict_aliasing=level, currently 3. */
2193 void
2194 set_Wstrict_aliasing (int onoff)
2196 gcc_assert (onoff == 0 || onoff == 1);
2197 if (onoff != 0)
2198 warn_strict_aliasing = 3;
2199 else
2200 warn_strict_aliasing = 0;
2203 /* The following routines are useful in setting all the flags that
2204 -ffast-math and -fno-fast-math imply. */
2205 void
2206 set_fast_math_flags (int set)
2208 flag_unsafe_math_optimizations = set;
2209 set_unsafe_math_optimizations_flags (set);
2210 flag_finite_math_only = set;
2211 flag_errno_math = !set;
2212 if (set)
2214 flag_signaling_nans = 0;
2215 flag_rounding_math = 0;
2216 flag_cx_limited_range = 1;
2220 /* When -funsafe-math-optimizations is set the following
2221 flags are set as well. */
2222 void
2223 set_unsafe_math_optimizations_flags (int set)
2225 flag_trapping_math = !set;
2226 flag_signed_zeros = !set;
2227 flag_associative_math = set;
2228 flag_reciprocal_math = set;
2231 /* Return true iff flags are set as if -ffast-math. */
2232 bool
2233 fast_math_flags_set_p (void)
2235 return (!flag_trapping_math
2236 && flag_unsafe_math_optimizations
2237 && flag_finite_math_only
2238 && !flag_signed_zeros
2239 && !flag_errno_math);
2242 /* Return true iff flags are set as if -ffast-math but using the flags stored
2243 in the struct cl_optimization structure. */
2244 bool
2245 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2247 return (!opt->flag_trapping_math
2248 && opt->flag_unsafe_math_optimizations
2249 && opt->flag_finite_math_only
2250 && !opt->flag_signed_zeros
2251 && !opt->flag_errno_math);
2254 /* Handle a debug output -g switch. EXTENDED is true or false to support
2255 extended output (2 is special and means "-ggdb" was given). */
2256 static void
2257 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2259 static bool type_explicit;
2261 use_gnu_debug_info_extensions = extended;
2263 if (type == NO_DEBUG)
2265 if (write_symbols == NO_DEBUG)
2267 write_symbols = PREFERRED_DEBUGGING_TYPE;
2269 if (extended == 2)
2271 #ifdef DWARF2_DEBUGGING_INFO
2272 write_symbols = DWARF2_DEBUG;
2273 #elif defined DBX_DEBUGGING_INFO
2274 write_symbols = DBX_DEBUG;
2275 #endif
2278 if (write_symbols == NO_DEBUG)
2279 warning (0, "target system does not support debug output");
2282 else
2284 /* Does it conflict with an already selected type? */
2285 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2286 error ("debug format \"%s\" conflicts with prior selection",
2287 debug_type_names[type]);
2288 write_symbols = type;
2289 type_explicit = true;
2292 /* A debug flag without a level defaults to level 2. */
2293 if (*arg == '\0')
2295 if (!debug_info_level)
2296 debug_info_level = DINFO_LEVEL_NORMAL;
2298 else
2300 int argval = integral_argument (arg);
2301 if (argval == -1)
2302 error ("unrecognised debug output level \"%s\"", arg);
2303 else if (argval > 3)
2304 error ("debug output level %s is too high", arg);
2305 else
2306 debug_info_level = (enum debug_info_level) argval;
2310 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2311 a simple on-off switch. */
2314 option_enabled (int opt_idx)
2316 const struct cl_option *option = &(cl_options[opt_idx]);
2318 if (option->flag_var)
2319 switch (option->var_type)
2321 case CLVC_BOOLEAN:
2322 return *(int *) option->flag_var != 0;
2324 case CLVC_EQUAL:
2325 return *(int *) option->flag_var == option->var_value;
2327 case CLVC_BIT_CLEAR:
2328 return (*(int *) option->flag_var & option->var_value) == 0;
2330 case CLVC_BIT_SET:
2331 return (*(int *) option->flag_var & option->var_value) != 0;
2333 case CLVC_STRING:
2334 break;
2336 return -1;
2339 /* Fill STATE with the current state of option OPTION. Return true if
2340 there is some state to store. */
2342 bool
2343 get_option_state (int option, struct cl_option_state *state)
2345 if (cl_options[option].flag_var == 0)
2346 return false;
2348 switch (cl_options[option].var_type)
2350 case CLVC_BOOLEAN:
2351 case CLVC_EQUAL:
2352 state->data = cl_options[option].flag_var;
2353 state->size = sizeof (int);
2354 break;
2356 case CLVC_BIT_CLEAR:
2357 case CLVC_BIT_SET:
2358 state->ch = option_enabled (option);
2359 state->data = &state->ch;
2360 state->size = 1;
2361 break;
2363 case CLVC_STRING:
2364 state->data = *(const char **) cl_options[option].flag_var;
2365 if (state->data == 0)
2366 state->data = "";
2367 state->size = strlen ((const char *) state->data) + 1;
2368 break;
2370 return true;
2373 /* Set *OPTION according to VALUE and ARG. */
2375 void
2376 set_option (const struct cl_option *option, int value, const char *arg)
2378 if (!option->flag_var)
2379 return;
2381 switch (option->var_type)
2383 case CLVC_BOOLEAN:
2384 *(int *) option->flag_var = value;
2385 break;
2387 case CLVC_EQUAL:
2388 *(int *) option->flag_var = (value
2389 ? option->var_value
2390 : !option->var_value);
2391 break;
2393 case CLVC_BIT_CLEAR:
2394 case CLVC_BIT_SET:
2395 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2396 *(int *) option->flag_var |= option->var_value;
2397 else
2398 *(int *) option->flag_var &= ~option->var_value;
2399 if (option->flag_var == &target_flags)
2400 target_flags_explicit |= option->var_value;
2401 break;
2403 case CLVC_STRING:
2404 *(const char **) option->flag_var = arg;
2405 break;
2410 /* Callback function, called when -Werror= enables a warning. */
2412 static void (*warning_as_error_callback) (int) = NULL;
2414 /* Register a callback for enable_warning_as_error calls. */
2416 void
2417 register_warning_as_error_callback (void (*callback) (int))
2419 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2420 warning_as_error_callback = callback;
2423 /* Enable a warning option as an error. This is used by -Werror= and
2424 also by legacy Werror-implicit-function-declaration. */
2426 void
2427 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2429 char *new_option;
2430 int option_index;
2432 new_option = XNEWVEC (char, strlen (arg) + 2);
2433 new_option[0] = 'W';
2434 strcpy (new_option + 1, arg);
2435 option_index = find_opt (new_option, lang_mask);
2436 if (option_index == N_OPTS)
2438 error ("-Werror=%s: No option -%s", arg, new_option);
2440 else
2442 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2444 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2445 if (kind == DK_ERROR)
2447 const struct cl_option * const option = cl_options + option_index;
2449 /* -Werror=foo implies -Wfoo. */
2450 if (option->var_type == CLVC_BOOLEAN && option->flag_var)
2451 *(int *) option->flag_var = 1;
2453 if (warning_as_error_callback)
2454 warning_as_error_callback (option_index);
2457 free (new_option);