1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
31 #include "langhooks.h"
37 #include "diagnostic.h"
38 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
39 #include "insn-attr.h" /* For INSN_SCHEDULING. */
41 #include "tree-pass.h"
45 /* Value of the -G xx switch, and whether it was passed or not. */
46 unsigned HOST_WIDE_INT g_switch_value;
49 /* True if we should exit after parsing options. */
50 bool exit_after_options;
52 /* Print various extra warnings. -W/-Wextra. */
55 /* True to warn about any objects definitions whose size is larger
56 than N bytes. Also want about function definitions whose returned
57 values are larger than N bytes, where N is `larger_than_size'. */
58 bool warn_larger_than;
59 HOST_WIDE_INT larger_than_size;
61 /* True to warn about any function whose frame size is larger
63 bool warn_frame_larger_than;
64 HOST_WIDE_INT frame_larger_than_size;
66 /* Hack for cooperation between set_Wunused and set_Wextra. */
67 static bool maybe_warn_unused_parameter;
69 /* Type(s) of debugging information we are producing (if any). See
70 flags.h for the definitions of the different possible types of
71 debugging information. */
72 enum debug_info_type write_symbols = NO_DEBUG;
74 /* Level of debugging information we are producing. See flags.h for
75 the definitions of the different possible levels. */
76 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
78 /* A major contribution to object and executable size is debug
79 information size. A major contribution to debug information size
80 is struct descriptions replicated in several object files. The
81 following flags attempt to reduce this information. The basic
82 idea is to not emit struct debugging information in the current
83 compilation unit when that information will be generated by
84 another compilation unit.
86 Debug information for a struct defined in the current source
87 file should be generated in the object file. Likewise the
88 debug information for a struct defined in a header should be
89 generated in the object file of the corresponding source file.
90 Both of these case are handled when the base name of the file of
91 the struct definition matches the base name of the source file
92 of the current compilation unit. This matching emits minimal
93 struct debugging information.
95 The base file name matching rule above will fail to emit debug
96 information for structs defined in system headers. So a second
97 category of files includes system headers in addition to files
100 The remaining types of files are library headers and application
101 headers. We cannot currently distinguish these two types. */
103 enum debug_struct_file
105 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
106 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
107 same base name as the compilation unit. */
108 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
110 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
113 /* Generic structs (e.g. templates not explicitly specialized)
114 may not have a compilation unit associated with them, and so
115 may need to be treated differently from ordinary structs.
117 Structs only handled by reference (indirectly), will also usually
118 not need as much debugging information. */
120 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
121 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
122 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
123 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
125 /* Parse the -femit-struct-debug-detailed option value
126 and set the flag variables. */
128 #define MATCH( prefix, string ) \
129 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
130 ? ((string += sizeof prefix - 1), 1) : 0)
133 set_struct_debug_option (const char *spec)
135 /* various labels for comparison */
136 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
137 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
138 static char none_lbl[] = "none", any_lbl[] = "any";
139 static char base_lbl[] = "base", sys_lbl[] = "sys";
141 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
142 /* Default is to apply to as much as possible. */
143 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
144 int ord = 1, gen = 1;
147 if (MATCH (dfn_lbl, spec))
148 usage = DINFO_USAGE_DFN;
149 else if (MATCH (dir_lbl, spec))
150 usage = DINFO_USAGE_DIR_USE;
151 else if (MATCH (ind_lbl, spec))
152 usage = DINFO_USAGE_IND_USE;
154 /* Generics or not? */
155 if (MATCH (ord_lbl, spec))
157 else if (MATCH (gen_lbl, spec))
160 /* What allowable environment? */
161 if (MATCH (none_lbl, spec))
162 files = DINFO_STRUCT_FILE_NONE;
163 else if (MATCH (any_lbl, spec))
164 files = DINFO_STRUCT_FILE_ANY;
165 else if (MATCH (sys_lbl, spec))
166 files = DINFO_STRUCT_FILE_SYS;
167 else if (MATCH (base_lbl, spec))
168 files = DINFO_STRUCT_FILE_BASE;
170 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
173 /* Effect the specification. */
174 if (usage == DINFO_USAGE_NUM_ENUMS)
178 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
179 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
180 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
184 debug_struct_generic[DINFO_USAGE_DFN] = files;
185 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
186 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
192 debug_struct_ordinary[usage] = files;
194 debug_struct_generic[usage] = files;
198 set_struct_debug_option (spec+1);
201 /* No more -femit-struct-debug-detailed specifications.
204 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
206 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
207 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
208 || debug_struct_generic[DINFO_USAGE_DIR_USE]
209 < debug_struct_generic[DINFO_USAGE_IND_USE])
210 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
211 " as much as %<-femit-struct-debug-detailed=ind:...%>");
215 /* Find the base name of a path, stripping off both directories and
216 a single final extension. */
218 base_of_path (const char *path, const char **base_out)
220 const char *base = path;
222 const char *p = path;
226 if (IS_DIR_SEPARATOR(c))
241 /* Match the base name of a file to the base name of a compilation unit. */
243 static const char *main_input_basename;
244 static int main_input_baselength;
247 matches_main_base (const char *path)
249 /* Cache the last query. */
250 static const char *last_path = NULL;
251 static int last_match = 0;
252 if (path != last_path)
255 int length = base_of_path (path, &base);
257 last_match = (length == main_input_baselength
258 && memcmp (base, main_input_basename, length) == 0);
263 #ifdef DEBUG_DEBUG_STRUCT
266 dump_struct_debug (tree type, enum debug_info_usage usage,
267 enum debug_struct_file criterion, int generic,
268 int matches, int result)
270 /* Find the type name. */
271 tree type_decl = TYPE_STUB_DECL (type);
273 const char *name = 0;
274 if (TREE_CODE (t) == TYPE_DECL)
277 name = IDENTIFIER_POINTER (t);
279 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
281 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
282 matches ? "bas" : "hdr",
283 generic ? "gen" : "ord",
284 usage == DINFO_USAGE_DFN ? ";" :
285 usage == DINFO_USAGE_DIR_USE ? "." : "*",
287 (void*) type_decl, name);
290 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
291 dump_struct_debug (type, usage, criterion, generic, matches, result)
295 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
302 should_emit_struct_debug (tree type, enum debug_info_usage usage)
304 enum debug_struct_file criterion;
306 bool generic = lang_hooks.types.generic_p (type);
309 criterion = debug_struct_generic[usage];
311 criterion = debug_struct_ordinary[usage];
313 if (criterion == DINFO_STRUCT_FILE_NONE)
314 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
315 if (criterion == DINFO_STRUCT_FILE_ANY)
316 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
318 type_decl = TYPE_STUB_DECL (type);
320 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
321 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
323 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
324 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
325 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
328 /* Nonzero means use GNU-only extensions in the generated symbolic
329 debugging information. Currently, this only has an effect when
330 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
331 bool use_gnu_debug_info_extensions;
333 /* The default visibility for all symbols (unless overridden) */
334 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
336 /* Disable unit-at-a-time for frontends that might be still broken in this
339 bool no_unit_at_a_time_default;
341 /* Global visibility options. */
342 struct visibility_flags visibility_options;
344 /* What to print when a switch has no documentation. */
345 #ifdef ENABLE_CHECKING
346 static const char undocumented_msg[] = N_("This switch lacks documentation");
348 static const char undocumented_msg[] = "";
351 /* Used for bookkeeping on whether user set these flags so
352 -fprofile-use/-fprofile-generate does not use them. */
353 static bool profile_arc_flag_set, flag_profile_values_set;
354 static bool flag_unroll_loops_set, flag_tracer_set;
355 static bool flag_value_profile_transformations_set;
356 static bool flag_peel_loops_set, flag_branch_probabilities_set;
357 static bool flag_inline_functions_set;
359 /* Functions excluded from profiling. */
361 typedef char *char_p; /* For DEF_VEC_P. */
363 DEF_VEC_ALLOC_P(char_p,heap);
365 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
366 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
368 typedef const char *const_char_p; /* For DEF_VEC_P. */
369 DEF_VEC_P(const_char_p);
370 DEF_VEC_ALLOC_P(const_char_p,heap);
372 static VEC(const_char_p,heap) *ignored_options;
374 /* Function calls disallowed under -Wdisallowed-function-list=... */
375 static VEC(char_p,heap) *warning_disallowed_functions;
377 /* If -Wdisallowed-function-list=... */
378 bool warn_disallowed_functions = false;
380 /* Input file names. */
381 const char **in_fnames;
382 unsigned num_in_fnames;
384 static int common_handle_option (size_t scode, const char *arg, int value,
385 unsigned int lang_mask);
386 static void handle_param (const char *);
387 static void set_Wextra (int);
388 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
389 static char *write_langs (unsigned int lang_mask);
390 static void complain_wrong_lang (const char *, const struct cl_option *,
391 unsigned int lang_mask);
392 static void handle_options (unsigned int, const char **, unsigned int);
393 static void set_debug_level (enum debug_info_type type, int extended,
396 /* If ARG is a non-negative integer made up solely of digits, return its
397 value, otherwise return -1. */
399 integral_argument (const char *arg)
403 while (*p && ISDIGIT (*p))
412 /* Return a malloced slash-separated list of languages in MASK. */
414 write_langs (unsigned int mask)
416 unsigned int n = 0, len = 0;
417 const char *lang_name;
420 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
421 if (mask & (1U << n))
422 len += strlen (lang_name) + 1;
424 result = XNEWVEC (char, len);
426 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
427 if (mask & (1U << n))
431 strcpy (result + len, lang_name);
432 len += strlen (lang_name);
440 /* Complain that switch OPT_INDEX does not apply to this front end. */
442 complain_wrong_lang (const char *text, const struct cl_option *option,
443 unsigned int lang_mask)
445 char *ok_langs, *bad_lang;
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);
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;
478 while (!VEC_empty (const_char_p, ignored_options))
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. */
491 handle_option (const char **argv, unsigned int lang_mask)
494 const char *opt, *arg = 0;
497 unsigned int result = 0;
498 const struct cl_option *option;
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);
513 memcpy (dup + 2, opt + 5, len - 2 + 1);
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]);
527 if (opt_index == cl_options_count)
530 option = &cl_options[opt_index];
532 /* Reject negative form of switches that don't take negatives as
534 if (!value && (option->flags & CL_REJECT_NEGATIVE))
537 /* We've recognized this switch. */
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);
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;
556 arg += strlen ("no-");
558 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
560 if (option->flags & CL_SEPARATE)
566 /* Missing argument. */
570 else if (option->flags & CL_SEPARATE)
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);
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
589 complain_wrong_lang (argv[0], option, lang_mask);
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);
600 /* If the switch takes an integer, convert it. */
601 if (arg && (option->flags & CL_UINTEGER))
603 value = integral_argument (arg);
606 error ("argument to \"%s\" should be a non-negative integer",
612 if (option->flag_var)
613 switch (option->var_type)
616 *(int *) option->flag_var = value;
620 *(int *) option->flag_var = (value
622 : !option->var_value);
627 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
628 *(int *) option->flag_var |= option->var_value;
630 *(int *) option->flag_var &= ~option->var_value;
631 if (option->flag_var == &target_flags)
632 target_flags_explicit |= option->var_value;
636 *(const char **) option->flag_var = arg;
640 if (option->flags & lang_mask)
641 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
644 if (result && (option->flags & CL_COMMON))
645 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
648 if (result && (option->flags & CL_TARGET))
649 if (!targetm.handle_option (opt_index, arg, value))
658 /* Handle FILENAME from the command line. */
660 add_input_filename (const char *filename)
663 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
664 in_fnames[num_in_fnames - 1] = filename;
667 /* Add comma-separated strings to a char_p vector. */
670 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
677 /* We never free this string. */
690 VEC_safe_push (char_p, heap, *pvec, token_start);
693 if (*r == '\\' && r[1] == ',')
701 if (*token_start != '\0')
702 VEC_safe_push (char_p, heap, *pvec, token_start);
705 /* Return whether we should exclude FNDECL from instrumentation. */
708 flag_instrument_functions_exclude_p (tree fndecl)
710 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
716 name = lang_hooks.decl_printable_name (fndecl, 0);
718 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
722 if (strstr (name, s) != NULL)
727 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
733 name = DECL_SOURCE_FILE (fndecl);
735 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
738 if (strstr (name, s) != NULL)
747 /* Return whether this function call is disallowed. */
749 warn_if_disallowed_function_p (const_tree exp)
751 if (TREE_CODE(exp) == CALL_EXPR
752 && VEC_length (char_p, warning_disallowed_functions) > 0)
757 IDENTIFIER_POINTER (DECL_NAME (get_callee_fndecl (exp)));
758 for (i = 0; VEC_iterate (char_p, warning_disallowed_functions, i, s);
761 if (strcmp (fnname, s) == 0)
763 warning (OPT_Wdisallowed_function_list_,
764 "disallowed call to %qs", fnname);
771 /* Decode and handle the vector of command line options. LANG_MASK
772 contains has a single bit set representing the current
775 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
779 for (i = 1; i < argc; i += n)
781 const char *opt = argv[i];
783 /* Interpret "-" or a non-switch as a file name. */
784 if (opt[0] != '-' || opt[1] == '\0')
786 if (main_input_filename == NULL)
788 main_input_filename = opt;
789 main_input_baselength
790 = base_of_path (main_input_filename, &main_input_basename);
792 add_input_filename (opt);
797 n = handle_option (argv + i, lang_mask);
802 error ("unrecognized command line option \"%s\"", opt);
807 /* Parse command line options and set default flag values. Do minimal
808 options processing. */
810 decode_options (unsigned int argc, const char **argv)
812 unsigned int i, lang_mask;
814 /* Perform language-specific options initialization. */
815 lang_mask = lang_hooks.init_options (argc, argv);
817 lang_hooks.initialize_diagnostics (global_dc);
819 /* Scan to see what optimization level has been specified. That will
820 determine the default value of many flags. */
821 for (i = 1; i < argc; i++)
823 if (!strcmp (argv[i], "-O"))
828 else if (argv[i][0] == '-' && argv[i][1] == 'O')
830 /* Handle -Os, -O2, -O3, -O69, ... */
831 const char *p = &argv[i][2];
833 if ((p[0] == 's') && (p[1] == 0))
837 /* Optimizing for size forces optimize to be 2. */
842 const int optimize_val = read_integral_parameter (p, p - 2, -1);
843 if (optimize_val != -1)
845 optimize = optimize_val;
854 flag_merge_constants = 0;
857 if (!no_unit_at_a_time_default)
859 flag_unit_at_a_time = 1;
861 flag_toplevel_reorder = 0;
868 flag_delayed_branch = 1;
870 #ifdef CAN_DEBUG_WITHOUT_FP
871 flag_omit_frame_pointer = 1;
873 flag_guess_branch_prob = 1;
874 flag_cprop_registers = 1;
875 flag_if_conversion = 1;
876 flag_if_conversion2 = 1;
877 flag_ipa_pure_const = 1;
878 flag_ipa_reference = 1;
879 flag_split_wide_types = 1;
886 flag_tree_copyrename = 1;
888 flag_tree_copy_prop = 1;
893 /* Loop header copying usually increases size of the code. This used
894 not to be true, since quite often it is possible to verify that
895 the condition is satisfied in the first iteration and therefore
896 to eliminate it. Jump threading handles these cases now. */
903 flag_inline_small_functions = 1;
904 flag_thread_jumps = 1;
905 flag_crossjumping = 1;
906 flag_optimize_sibling_calls = 1;
907 flag_forward_propagate = 1;
908 flag_cse_follow_jumps = 1;
910 flag_expensive_optimizations = 1;
911 flag_rerun_cse_after_loop = 1;
912 flag_caller_saves = 1;
914 #ifdef INSN_SCHEDULING
915 flag_schedule_insns = 1;
916 flag_schedule_insns_after_reload = 1;
919 flag_strict_aliasing = 1;
920 flag_strict_overflow = 1;
921 flag_delete_null_pointer_checks = 1;
922 flag_reorder_blocks = 1;
923 flag_reorder_functions = 1;
924 flag_tree_store_ccp = 1;
926 flag_tree_switch_conversion = 1;
930 /* Conditional DCE generates bigger code. */
931 flag_tree_builtin_call_dce = 1;
932 /* PRE tends to generate bigger code. */
936 /* Allow more virtual operators to increase alias precision. */
937 set_param_value ("max-aliased-vops", 500);
939 /* Track fields in field-sensitive alias analysis. */
940 set_param_value ("max-fields-for-field-sensitive", 100);
945 flag_predictive_commoning = 1;
946 flag_inline_functions = 1;
947 flag_unswitch_loops = 1;
948 flag_gcse_after_reload = 1;
949 flag_tree_vectorize = 1;
951 /* Allow even more virtual operators. */
952 set_param_value ("max-aliased-vops", 1000);
953 set_param_value ("avg-aliased-vops", 3);
956 if (optimize < 2 || optimize_size)
963 /* Don't reorder blocks when optimizing for size because extra
964 jump insns may be created; also barrier may create extra padding.
966 More correctly we should have a block reordering mode that tried
967 to minimize the combined size of all the jumps. This would more
968 or less automatically remove extra jumps, but would also try to
969 use more short jumps instead of long jumps. */
970 flag_reorder_blocks = 0;
971 flag_reorder_blocks_and_partition = 0;
976 /* Inlining of functions reducing size is a good idea regardless
977 of them being declared inline. */
978 flag_inline_functions = 1;
980 /* We want to crossjump as much as possible. */
981 set_param_value ("min-crossjump-insns", 1);
984 /* Initialize whether `char' is signed. */
985 flag_signed_char = DEFAULT_SIGNED_CHAR;
986 /* Set this to a special "uninitialized" value. The actual default is set
987 after target options have been processed. */
988 flag_short_enums = 2;
990 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
992 target_flags = targetm.default_target_flags;
994 /* Some targets have ABI-specified unwind tables. */
995 flag_unwind_tables = targetm.unwind_tables_default;
997 #ifdef OPTIMIZATION_OPTIONS
998 /* Allow default optimizations to be specified on a per-machine basis. */
999 OPTIMIZATION_OPTIONS (optimize, optimize_size);
1002 handle_options (argc, argv, lang_mask);
1005 flag_pic = flag_pie;
1006 if (flag_pic && !flag_pie)
1009 if (flag_no_inline == 2)
1012 flag_really_no_inline = flag_no_inline;
1014 /* Set flag_no_inline before the post_options () hook. The C front
1015 ends use it to determine tree inlining defaults. FIXME: such
1016 code should be lang-independent when all front ends use tree
1017 inlining, in which case it, and this condition, should be moved
1018 to the top of process_options() instead. */
1021 /* Inlining does not work if not optimizing,
1022 so force it not to be done. */
1026 /* The c_decode_option function and decode_option hook set
1027 this to `2' if -Wall is used, so we can avoid giving out
1028 lots of errors for people who don't realize what -Wall does. */
1029 if (warn_uninitialized == 1)
1030 warning (OPT_Wuninitialized,
1031 "-Wuninitialized is not supported without -O");
1034 if (flag_really_no_inline == 2)
1035 flag_really_no_inline = flag_no_inline;
1037 /* Inlining of functions called just once will only work if we can look
1038 at the complete translation unit. */
1039 if (flag_inline_functions_called_once && !flag_unit_at_a_time)
1041 flag_inline_functions_called_once = 0;
1042 warning (OPT_Wdisabled_optimization,
1043 "-funit-at-a-time is required for inlining of functions "
1044 "that are only called once");
1047 /* The optimization to partition hot and cold basic blocks into separate
1048 sections of the .o and executable files does not work (currently)
1049 with exception handling. This is because there is no support for
1050 generating unwind info. If flag_exceptions is turned on we need to
1051 turn off the partitioning optimization. */
1053 if (flag_exceptions && flag_reorder_blocks_and_partition)
1056 ("-freorder-blocks-and-partition does not work with exceptions");
1057 flag_reorder_blocks_and_partition = 0;
1058 flag_reorder_blocks = 1;
1061 /* If user requested unwind info, then turn off the partitioning
1064 if (flag_unwind_tables && ! targetm.unwind_tables_default
1065 && flag_reorder_blocks_and_partition)
1067 inform ("-freorder-blocks-and-partition does not support unwind info");
1068 flag_reorder_blocks_and_partition = 0;
1069 flag_reorder_blocks = 1;
1072 /* If the target requested unwind info, then turn off the partitioning
1073 optimization with a different message. Likewise, if the target does not
1074 support named sections. */
1076 if (flag_reorder_blocks_and_partition
1077 && (!targetm.have_named_sections
1078 || (flag_unwind_tables && targetm.unwind_tables_default)))
1081 ("-freorder-blocks-and-partition does not work on this architecture");
1082 flag_reorder_blocks_and_partition = 0;
1083 flag_reorder_blocks = 1;
1087 #define LEFT_COLUMN 27
1089 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1090 followed by word-wrapped HELP in a second column. */
1092 wrap_help (const char *help,
1094 unsigned int item_width,
1095 unsigned int columns)
1097 unsigned int col_width = LEFT_COLUMN;
1098 unsigned int remaining, room, len;
1100 remaining = strlen (help);
1104 room = columns - 3 - MAX (col_width, item_width);
1113 for (i = 0; help[i]; i++)
1115 if (i >= room && len != remaining)
1119 else if ((help[i] == '-' || help[i] == '/')
1120 && help[i + 1] != ' '
1121 && i > 0 && ISALPHA (help[i - 1]))
1126 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1128 while (help[len] == ' ')
1136 /* Print help for a specific front-end, etc. */
1138 print_filtered_help (unsigned int include_flags,
1139 unsigned int exclude_flags,
1140 unsigned int any_flags,
1141 unsigned int columns)
1145 static char *printed = NULL;
1147 bool displayed = false;
1149 if (include_flags == CL_PARAMS)
1151 for (i = 0; i < LAST_PARAM; i++)
1153 const char *param = compiler_params[i].option;
1155 help = compiler_params[i].help;
1156 if (help == NULL || *help == '\0')
1158 if (exclude_flags & CL_UNDOCUMENTED)
1160 help = undocumented_msg;
1163 /* Get the translation. */
1166 wrap_help (help, param, strlen (param), columns);
1173 printed = XCNEWVAR (char, cl_options_count);
1175 for (i = 0; i < cl_options_count; i++)
1177 static char new_help[128];
1178 const struct cl_option *option = cl_options + i;
1183 if (include_flags == 0
1184 || ((option->flags & include_flags) != include_flags))
1186 if ((option->flags & any_flags) == 0)
1190 /* Skip unwanted switches. */
1191 if ((option->flags & exclude_flags) != 0)
1195 /* Skip switches that have already been printed. */
1201 help = option->help;
1204 if (exclude_flags & CL_UNDOCUMENTED)
1206 help = undocumented_msg;
1209 /* Get the translation. */
1212 /* Find the gap between the name of the
1213 option and its descriptive text. */
1214 tab = strchr (help, '\t');
1223 opt = option->opt_text;
1227 /* With the -Q option enabled we change the descriptive text associated
1228 with an option to be an indication of its current setting. */
1231 if (len < (LEFT_COLUMN + 2))
1232 strcpy (new_help, "\t\t");
1234 strcpy (new_help, "\t");
1236 if (option->flag_var != NULL)
1238 if (option->flags & CL_JOINED)
1240 if (option->var_type == CLVC_STRING)
1242 if (* (const char **) option->flag_var != NULL)
1243 snprintf (new_help + strlen (new_help),
1244 sizeof (new_help) - strlen (new_help),
1245 * (const char **) option->flag_var);
1248 sprintf (new_help + strlen (new_help),
1249 "%#x", * (int *) option->flag_var);
1252 strcat (new_help, option_enabled (i)
1253 ? _("[enabled]") : _("[disabled]"));
1259 wrap_help (help, opt, len, columns);
1265 unsigned int langs = include_flags & CL_LANG_ALL;
1268 printf (_(" No options with the desired characteristics were found\n"));
1273 /* PR 31349: Tell the user how to see all of the
1274 options supported by a specific front end. */
1275 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1276 if ((1U << i) & langs)
1277 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1278 lang_names[i], lang_names[i]);
1282 else if (! displayed)
1283 printf (_(" All options with the desired characteristics have already been displayed\n"));
1288 /* Display help for a specified type of option.
1289 The options must have ALL of the INCLUDE_FLAGS set
1290 ANY of the flags in the ANY_FLAGS set
1291 and NONE of the EXCLUDE_FLAGS set. */
1293 print_specific_help (unsigned int include_flags,
1294 unsigned int exclude_flags,
1295 unsigned int any_flags)
1297 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1298 const char * description = NULL;
1299 const char * descrip_extra = "";
1302 static unsigned int columns = 0;
1304 /* Sanity check: Make sure that we do not have more
1305 languages than we have bits available to enumerate them. */
1306 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1308 /* If we have not done so already, obtain
1309 the desired maximum width of the output. */
1314 GET_ENVIRONMENT (p, "COLUMNS");
1317 int value = atoi (p);
1324 /* Use a reasonable default. */
1328 /* Decide upon the title for the options that we are going to display. */
1329 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1331 switch (flag & include_flags)
1337 description = _("The following options are target specific");
1340 description = _("The following options control compiler warning messages");
1342 case CL_OPTIMIZATION:
1343 description = _("The following options control optimizations");
1346 description = _("The following options are language-independent");
1349 description = _("The --param option recognizes the following as parameters");
1352 if (i >= cl_lang_count)
1354 if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
1355 description = _("The following options are specific to just the language ");
1357 description = _("The following options are supported by the language ");
1358 descrip_extra = lang_names [i];
1363 if (description == NULL)
1367 if (include_flags == CL_UNDOCUMENTED)
1368 description = _("The following options are not documented");
1371 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1378 if (any_flags & all_langs_mask)
1379 description = _("The following options are language-related");
1381 description = _("The following options are language-independent");
1385 printf ("%s%s:\n", description, descrip_extra);
1386 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1389 /* Handle target- and language-independent options. Return zero to
1390 generate an "unknown option" message. Only options that need
1391 extra handling need to be listed here; if you simply want
1392 VALUE assigned to a variable, it happens automatically. */
1395 common_handle_option (size_t scode, const char *arg, int value,
1396 unsigned int lang_mask)
1398 static bool verbose = false;
1399 enum opt_code code = (enum opt_code) scode;
1414 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1415 unsigned int undoc_mask;
1418 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1419 /* First display any single language specific options. */
1420 for (i = 0; i < cl_lang_count; i++)
1422 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1423 /* Next display any multi language specific options. */
1424 print_specific_help (0, undoc_mask, all_langs_mask);
1425 /* Then display any remaining, non-language options. */
1426 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1427 print_specific_help (i, undoc_mask, 0);
1428 exit_after_options = true;
1432 case OPT_ftarget_help:
1433 case OPT__target_help:
1434 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1435 exit_after_options = true;
1437 /* Allow the target a chance to give the user some additional information. */
1438 if (targetm.target_help)
1439 targetm.target_help ();
1445 const char * a = arg;
1446 unsigned int include_flags = 0;
1447 /* Note - by default we include undocumented options when listing
1448 specific classes. If you only want to see documented options
1449 then add ",^undocumented" to the --help= option. E.g.:
1451 --help=target,^undocumented */
1452 unsigned int exclude_flags = 0;
1454 /* Walk along the argument string, parsing each word in turn.
1456 arg = [^]{word}[,{arg}]
1457 word = {optimizers|target|warnings|undocumented|
1458 params|common|<language>} */
1463 const char * string;
1468 { "optimizers", CL_OPTIMIZATION },
1469 { "target", CL_TARGET },
1470 { "warnings", CL_WARNING },
1471 { "undocumented", CL_UNDOCUMENTED },
1472 { "params", CL_PARAMS },
1473 { "joined", CL_JOINED },
1474 { "separate", CL_SEPARATE },
1475 { "common", CL_COMMON },
1478 unsigned int * pflags;
1480 unsigned int lang_flag, specific_flag;
1487 pflags = & exclude_flags;
1490 pflags = & include_flags;
1492 comma = strchr (a, ',');
1498 /* Check to see if the string matches an option class name. */
1499 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1500 if (strncasecmp (a, specifics[i].string, len) == 0)
1502 specific_flag = specifics[i].flag;
1506 /* Check to see if the string matches a language name.
1507 Note - we rely upon the alpha-sorted nature of the entries in
1508 the lang_names array, specifically that shorter names appear
1509 before their longer variants. (i.e. C before C++). That way
1510 when we are attempting to match --help=c for example we will
1511 match with C first and not C++. */
1512 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1513 if (strncasecmp (a, lang_names[i], len) == 0)
1515 lang_flag = 1U << i;
1519 if (specific_flag != 0)
1522 * pflags |= specific_flag;
1525 /* The option's argument matches both the start of a
1526 language name and the start of an option class name.
1527 We have a special case for when the user has
1528 specified "--help=c", but otherwise we have to issue
1530 if (strncasecmp (a, "c", len) == 0)
1531 * pflags |= lang_flag;
1534 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1538 else if (lang_flag != 0)
1539 * pflags |= lang_flag;
1542 "warning: unrecognized argument to --help= option: %.*s\n",
1551 print_specific_help (include_flags, exclude_flags, 0);
1552 exit_after_options = true;
1557 print_version (stderr, "");
1558 exit_after_options = true;
1562 g_switch_value = value;
1563 g_switch_set = true;
1568 /* Currently handled in a prescan. */
1572 /* For backward compatibility, -W is the same as -Wextra. */
1576 case OPT_Wdisallowed_function_list_:
1577 warn_disallowed_functions = true;
1578 add_comma_separated_to_vector
1579 (&warning_disallowed_functions, arg);
1583 enable_warning_as_error (arg, value, lang_mask);
1590 case OPT_Wlarger_than_:
1591 /* This form corresponds to -Wlarger-than-.
1592 Kept for backward compatibility.
1593 Don't use it as the first argument of warning(). */
1595 case OPT_Wlarger_than_eq:
1596 larger_than_size = value;
1597 warn_larger_than = value != -1;
1600 case OPT_Wframe_larger_than_:
1601 frame_larger_than_size = value;
1602 warn_frame_larger_than = value != -1;
1605 case OPT_Wstrict_aliasing:
1606 set_Wstrict_aliasing (value);
1609 case OPT_Wstrict_aliasing_:
1610 warn_strict_aliasing = value;
1613 case OPT_Wstrict_overflow:
1614 warn_strict_overflow = (value
1615 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1619 case OPT_Wstrict_overflow_:
1620 warn_strict_overflow = value;
1624 set_Wunused (value);
1629 aux_info_file_name = arg;
1630 flag_gen_aux_info = 1;
1634 aux_base_name = arg;
1637 case OPT_auxbase_strip:
1639 char *tmp = xstrdup (arg);
1640 strip_off_ending (tmp, strlen (tmp));
1642 aux_base_name = tmp;
1647 decode_d_option (arg);
1651 dump_base_name = arg;
1654 case OPT_falign_functions_:
1655 align_functions = value;
1658 case OPT_falign_jumps_:
1659 align_jumps = value;
1662 case OPT_falign_labels_:
1663 align_labels = value;
1666 case OPT_falign_loops_:
1667 align_loops = value;
1670 case OPT_fbranch_probabilities:
1671 flag_branch_probabilities_set = true;
1674 case OPT_fcall_used_:
1675 fix_register (arg, 0, 1);
1678 case OPT_fcall_saved_:
1679 fix_register (arg, 0, 0);
1683 dbg_cnt_process_opt (arg);
1686 case OPT_fdbg_cnt_list:
1687 dbg_cnt_list_all_counters ();
1690 case OPT_fdebug_prefix_map_:
1691 add_debug_prefix_map (arg);
1694 case OPT_fdiagnostics_show_location_:
1695 if (!strcmp (arg, "once"))
1696 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1697 else if (!strcmp (arg, "every-line"))
1698 diagnostic_prefixing_rule (global_dc)
1699 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1704 case OPT_fdiagnostics_show_option:
1705 global_dc->show_option_requested = true;
1709 if (!dump_switch_p (arg))
1713 case OPT_ffast_math:
1714 set_fast_math_flags (value);
1717 case OPT_funsafe_math_optimizations:
1718 set_unsafe_math_optimizations_flags (value);
1722 fix_register (arg, 1, 1);
1725 case OPT_finline_limit_:
1726 case OPT_finline_limit_eq:
1727 set_param_value ("max-inline-insns-single", value / 2);
1728 set_param_value ("max-inline-insns-auto", value / 2);
1731 case OPT_finstrument_functions_exclude_function_list_:
1732 add_comma_separated_to_vector
1733 (&flag_instrument_functions_exclude_functions, arg);
1736 case OPT_finstrument_functions_exclude_file_list_:
1737 add_comma_separated_to_vector
1738 (&flag_instrument_functions_exclude_files, arg);
1741 case OPT_fmessage_length_:
1742 pp_set_line_maximum_length (global_dc->printer, value);
1745 case OPT_fpack_struct_:
1746 if (value <= 0 || (value & (value - 1)) || value > 16)
1747 error ("structure alignment must be a small power of two, not %d", value);
1750 initial_max_fld_align = value;
1751 maximum_field_alignment = value * BITS_PER_UNIT;
1755 case OPT_fpeel_loops:
1756 flag_peel_loops_set = true;
1759 case OPT_fprofile_arcs:
1760 profile_arc_flag_set = true;
1763 case OPT_finline_functions:
1764 flag_inline_functions_set = true;
1767 case OPT_fprofile_dir_:
1768 profile_data_prefix = xstrdup (arg);
1771 case OPT_fprofile_use_:
1772 profile_data_prefix = xstrdup (arg);
1773 flag_profile_use = true;
1775 /* No break here - do -fprofile-use processing. */
1776 case OPT_fprofile_use:
1777 if (!flag_branch_probabilities_set)
1778 flag_branch_probabilities = value;
1779 if (!flag_profile_values_set)
1780 flag_profile_values = value;
1781 if (!flag_unroll_loops_set)
1782 flag_unroll_loops = value;
1783 if (!flag_peel_loops_set)
1784 flag_peel_loops = value;
1785 if (!flag_tracer_set)
1786 flag_tracer = value;
1787 if (!flag_value_profile_transformations_set)
1788 flag_value_profile_transformations = value;
1789 if (!flag_inline_functions_set)
1790 flag_inline_functions = value;
1793 case OPT_fprofile_generate_:
1794 profile_data_prefix = xstrdup (arg);
1796 /* No break here - do -fprofile-generate processing. */
1797 case OPT_fprofile_generate:
1798 if (!profile_arc_flag_set)
1799 profile_arc_flag = value;
1800 if (!flag_profile_values_set)
1801 flag_profile_values = value;
1802 if (!flag_value_profile_transformations_set)
1803 flag_value_profile_transformations = value;
1804 if (!flag_inline_functions_set)
1805 flag_inline_functions = value;
1808 case OPT_fprofile_values:
1809 flag_profile_values_set = true;
1812 case OPT_fvisibility_:
1814 if (!strcmp(arg, "default"))
1815 default_visibility = VISIBILITY_DEFAULT;
1816 else if (!strcmp(arg, "internal"))
1817 default_visibility = VISIBILITY_INTERNAL;
1818 else if (!strcmp(arg, "hidden"))
1819 default_visibility = VISIBILITY_HIDDEN;
1820 else if (!strcmp(arg, "protected"))
1821 default_visibility = VISIBILITY_PROTECTED;
1823 error ("unrecognized visibility value \"%s\"", arg);
1828 flag_value_profile_transformations_set = true;
1831 case OPT_frandom_seed:
1832 /* The real switch is -fno-random-seed. */
1835 set_random_seed (NULL);
1838 case OPT_frandom_seed_:
1839 set_random_seed (arg);
1842 case OPT_fsched_verbose_:
1843 #ifdef INSN_SCHEDULING
1844 fix_sched_param ("verbose", arg);
1850 case OPT_fsched_stalled_insns_:
1851 flag_sched_stalled_insns = value;
1852 if (flag_sched_stalled_insns == 0)
1853 flag_sched_stalled_insns = -1;
1856 case OPT_fsched_stalled_insns_dep_:
1857 flag_sched_stalled_insns_dep = value;
1860 case OPT_fstack_limit:
1861 /* The real switch is -fno-stack-limit. */
1864 stack_limit_rtx = NULL_RTX;
1867 case OPT_fstack_limit_register_:
1869 int reg = decode_reg_name (arg);
1871 error ("unrecognized register name \"%s\"", arg);
1873 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1877 case OPT_fstack_limit_symbol_:
1878 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1881 case OPT_ftree_vectorizer_verbose_:
1882 vect_set_verbosity_level (arg);
1885 case OPT_ftls_model_:
1886 if (!strcmp (arg, "global-dynamic"))
1887 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1888 else if (!strcmp (arg, "local-dynamic"))
1889 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1890 else if (!strcmp (arg, "initial-exec"))
1891 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1892 else if (!strcmp (arg, "local-exec"))
1893 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1895 warning (0, "unknown tls-model \"%s\"", arg);
1899 flag_tracer_set = true;
1902 case OPT_funroll_loops:
1903 flag_unroll_loops_set = true;
1907 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1911 set_debug_level (SDB_DEBUG, false, arg);
1915 set_debug_level (DWARF2_DEBUG, false, arg);
1919 set_debug_level (NO_DEBUG, 2, arg);
1924 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1928 set_debug_level (VMS_DEBUG, false, arg);
1933 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1937 asm_file_name = arg;
1940 case OPT_pedantic_errors:
1941 flag_pedantic_errors = pedantic = 1;
1944 case OPT_floop_optimize:
1945 case OPT_frerun_loop_opt:
1946 case OPT_fstrength_reduce:
1947 case OPT_ftree_store_copy_prop:
1948 case OPT_fforce_addr:
1949 case OPT_ftree_salias:
1950 /* These are no-ops, preserved for backward compatibility. */
1954 /* If the flag was handled in a standard way, assume the lack of
1955 processing here is intentional. */
1956 gcc_assert (cl_options[scode].flag_var);
1963 /* Handle --param NAME=VALUE. */
1965 handle_param (const char *carg)
1970 arg = xstrdup (carg);
1971 equal = strchr (arg, '=');
1973 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1976 value = integral_argument (equal + 1);
1978 error ("invalid --param value %qs", equal + 1);
1982 set_param_value (arg, value);
1989 /* Handle -W and -Wextra. */
1991 set_Wextra (int setting)
1993 extra_warnings = setting;
1994 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1996 /* We save the value of warn_uninitialized, since if they put
1997 -Wuninitialized on the command line, we need to generate a
1998 warning about not using it without also specifying -O. */
2000 warn_uninitialized = 0;
2001 else if (warn_uninitialized != 1)
2002 warn_uninitialized = 2;
2005 /* Initialize unused warning flags. */
2007 set_Wunused (int setting)
2009 warn_unused_function = setting;
2010 warn_unused_label = setting;
2011 /* Unused function parameter warnings are reported when either
2012 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
2013 Thus, if -Wextra has already been seen, set warn_unused_parameter;
2014 otherwise set maybe_warn_extra_parameter, which will be picked up
2016 maybe_warn_unused_parameter = setting;
2017 warn_unused_parameter = (setting && extra_warnings);
2018 warn_unused_variable = setting;
2019 warn_unused_value = setting;
2022 /* Used to set the level of strict aliasing warnings,
2023 when no level is specified (i.e., when -Wstrict-aliasing, and not
2024 -Wstrict-aliasing=level was given).
2025 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2026 and 0 otherwise. After calling this function, wstrict_aliasing will be
2027 set to the default value of -Wstrict_aliasing=level, currently 3. */
2029 set_Wstrict_aliasing (int onoff)
2031 gcc_assert (onoff == 0 || onoff == 1);
2033 warn_strict_aliasing = 3;
2035 warn_strict_aliasing = 0;
2038 /* The following routines are useful in setting all the flags that
2039 -ffast-math and -fno-fast-math imply. */
2041 set_fast_math_flags (int set)
2043 flag_unsafe_math_optimizations = set;
2044 set_unsafe_math_optimizations_flags (set);
2045 flag_finite_math_only = set;
2046 flag_errno_math = !set;
2049 flag_signaling_nans = 0;
2050 flag_rounding_math = 0;
2051 flag_cx_limited_range = 1;
2055 /* When -funsafe-math-optimizations is set the following
2056 flags are set as well. */
2058 set_unsafe_math_optimizations_flags (int set)
2060 flag_trapping_math = !set;
2061 flag_signed_zeros = !set;
2062 flag_associative_math = set;
2063 flag_reciprocal_math = set;
2066 /* Return true iff flags are set as if -ffast-math. */
2068 fast_math_flags_set_p (void)
2070 return (!flag_trapping_math
2071 && flag_unsafe_math_optimizations
2072 && flag_finite_math_only
2073 && !flag_signed_zeros
2074 && !flag_errno_math);
2077 /* Handle a debug output -g switch. EXTENDED is true or false to support
2078 extended output (2 is special and means "-ggdb" was given). */
2080 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2082 static bool type_explicit;
2084 use_gnu_debug_info_extensions = extended;
2086 if (type == NO_DEBUG)
2088 if (write_symbols == NO_DEBUG)
2090 write_symbols = PREFERRED_DEBUGGING_TYPE;
2094 #ifdef DWARF2_DEBUGGING_INFO
2095 write_symbols = DWARF2_DEBUG;
2096 #elif defined DBX_DEBUGGING_INFO
2097 write_symbols = DBX_DEBUG;
2101 if (write_symbols == NO_DEBUG)
2102 warning (0, "target system does not support debug output");
2107 /* Does it conflict with an already selected type? */
2108 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2109 error ("debug format \"%s\" conflicts with prior selection",
2110 debug_type_names[type]);
2111 write_symbols = type;
2112 type_explicit = true;
2115 /* A debug flag without a level defaults to level 2. */
2118 if (!debug_info_level)
2119 debug_info_level = 2;
2123 debug_info_level = integral_argument (arg);
2124 if (debug_info_level == (unsigned int) -1)
2125 error ("unrecognised debug output level \"%s\"", arg);
2126 else if (debug_info_level > 3)
2127 error ("debug output level %s is too high", arg);
2131 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2132 a simple on-off switch. */
2135 option_enabled (int opt_idx)
2137 const struct cl_option *option = &(cl_options[opt_idx]);
2139 if (option->flag_var)
2140 switch (option->var_type)
2143 return *(int *) option->flag_var != 0;
2146 return *(int *) option->flag_var == option->var_value;
2148 case CLVC_BIT_CLEAR:
2149 return (*(int *) option->flag_var & option->var_value) == 0;
2152 return (*(int *) option->flag_var & option->var_value) != 0;
2160 /* Fill STATE with the current state of option OPTION. Return true if
2161 there is some state to store. */
2164 get_option_state (int option, struct cl_option_state *state)
2166 if (cl_options[option].flag_var == 0)
2169 switch (cl_options[option].var_type)
2173 state->data = cl_options[option].flag_var;
2174 state->size = sizeof (int);
2177 case CLVC_BIT_CLEAR:
2179 state->ch = option_enabled (option);
2180 state->data = &state->ch;
2185 state->data = *(const char **) cl_options[option].flag_var;
2186 if (state->data == 0)
2188 state->size = strlen ((const char *) state->data) + 1;
2194 /* Enable a warning option as an error. This is used by -Werror= and
2195 also by legacy Werror-implicit-function-declaration. */
2198 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2203 new_option = XNEWVEC (char, strlen (arg) + 2);
2204 new_option[0] = 'W';
2205 strcpy (new_option + 1, arg);
2206 option_index = find_opt (new_option, lang_mask);
2207 if (option_index == N_OPTS)
2209 error ("-Werror=%s: No option -%s", arg, new_option);
2213 int kind = value ? DK_ERROR : DK_WARNING;
2214 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2216 /* -Werror=foo implies -Wfoo. */
2217 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2218 && cl_options[option_index].flag_var
2219 && kind == DK_ERROR)
2220 *(int *) cl_options[option_index].flag_var = 1;