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. */
462 static void postpone_unknown_option_error(const char *opt)
464 VEC_safe_push (const_char_p, heap, ignored_options, opt);
467 /* Produce an error for each option previously buffered. */
469 void print_ignored_options (void)
471 location_t saved_loc = input_location;
475 while (!VEC_empty (const_char_p, ignored_options))
478 opt = VEC_pop (const_char_p, ignored_options);
479 error ("unrecognized command line option \"%s\"", opt);
482 input_location = saved_loc;
485 /* Handle the switch beginning at ARGV for the language indicated by
486 LANG_MASK. Returns the number of switches consumed. */
488 handle_option (const char **argv, unsigned int lang_mask)
491 const char *opt, *arg = 0;
494 unsigned int result = 0;
495 const struct cl_option *option;
499 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
500 if (opt_index == cl_options_count
501 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
502 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
504 /* Drop the "no-" from negative switches. */
505 size_t len = strlen (opt) - 3;
507 dup = XNEWVEC (char, len + 1);
510 memcpy (dup + 2, opt + 5, len - 2 + 1);
513 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
514 if (opt_index == cl_options_count && opt[1] == 'W')
516 /* We don't generate errors for unknown -Wno-* options
517 unless we issue diagnostics. */
518 postpone_unknown_option_error (argv[0]);
524 if (opt_index == cl_options_count)
527 option = &cl_options[opt_index];
529 /* Reject negative form of switches that don't take negatives as
531 if (!value && (option->flags & CL_REJECT_NEGATIVE))
534 /* We've recognized this switch. */
537 /* Check to see if the option is disabled for this configuration. */
538 if (option->flags & CL_DISABLED)
540 error ("command line option %qs"
541 " is not supported by this configuration", opt);
545 /* Sort out any argument the switch takes. */
546 if (option->flags & CL_JOINED)
548 /* Have arg point to the original switch. This is because
549 some code, such as disable_builtin_function, expects its
550 argument to be persistent until the program exits. */
551 arg = argv[0] + cl_options[opt_index].opt_len + 1;
553 arg += strlen ("no-");
555 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
557 if (option->flags & CL_SEPARATE)
563 /* Missing argument. */
567 else if (option->flags & CL_SEPARATE)
573 /* Now we've swallowed any potential argument, complain if this
574 is a switch for a different front end. */
575 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
577 complain_wrong_lang (argv[0], option, lang_mask);
580 else if ((option->flags & CL_TARGET)
581 && (option->flags & CL_LANG_ALL)
582 && !(option->flags & lang_mask))
584 /* Complain for target flag language mismatches if any languages
586 complain_wrong_lang (argv[0], option, lang_mask);
590 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
592 if (!lang_hooks.missing_argument (opt, opt_index))
593 error ("missing argument to \"%s\"", opt);
597 /* If the switch takes an integer, convert it. */
598 if (arg && (option->flags & CL_UINTEGER))
600 value = integral_argument (arg);
603 error ("argument to \"%s\" should be a non-negative integer",
609 if (option->flag_var)
610 switch (option->var_type)
613 *(int *) option->flag_var = value;
617 *(int *) option->flag_var = (value
619 : !option->var_value);
624 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
625 *(int *) option->flag_var |= option->var_value;
627 *(int *) option->flag_var &= ~option->var_value;
628 if (option->flag_var == &target_flags)
629 target_flags_explicit |= option->var_value;
633 *(const char **) option->flag_var = arg;
637 if (option->flags & lang_mask)
638 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
641 if (result && (option->flags & CL_COMMON))
642 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
645 if (result && (option->flags & CL_TARGET))
646 if (!targetm.handle_option (opt_index, arg, value))
655 /* Handle FILENAME from the command line. */
657 add_input_filename (const char *filename)
660 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
661 in_fnames[num_in_fnames - 1] = filename;
664 /* Add comma-separated strings to a char_p vector. */
667 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
674 /* We never free this string. */
687 VEC_safe_push (char_p, heap, *pvec, token_start);
690 if (*r == '\\' && r[1] == ',')
698 if (*token_start != '\0')
699 VEC_safe_push (char_p, heap, *pvec, token_start);
702 /* Return whether we should exclude FNDECL from instrumentation. */
705 flag_instrument_functions_exclude_p (tree fndecl)
707 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
713 name = lang_hooks.decl_printable_name (fndecl, 0);
715 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
719 if (strstr (name, s) != NULL)
724 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
730 name = DECL_SOURCE_FILE (fndecl);
732 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
735 if (strstr (name, s) != NULL)
744 /* Return whether this function call is disallowed. */
746 warn_if_disallowed_function_p (const_tree exp)
748 if (TREE_CODE(exp) == CALL_EXPR
749 && VEC_length (char_p, warning_disallowed_functions) > 0)
754 IDENTIFIER_POINTER (DECL_NAME (get_callee_fndecl (exp)));
755 for (i = 0; VEC_iterate (char_p, warning_disallowed_functions, i, s);
758 if (strcmp (fnname, s) == 0)
760 warning (OPT_Wdisallowed_function_list_,
761 "disallowed call to %qs", fnname);
768 /* Decode and handle the vector of command line options. LANG_MASK
769 contains has a single bit set representing the current
772 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
776 for (i = 1; i < argc; i += n)
778 const char *opt = argv[i];
780 /* Interpret "-" or a non-switch as a file name. */
781 if (opt[0] != '-' || opt[1] == '\0')
783 if (main_input_filename == NULL)
785 main_input_filename = opt;
786 main_input_baselength
787 = base_of_path (main_input_filename, &main_input_basename);
789 add_input_filename (opt);
794 n = handle_option (argv + i, lang_mask);
799 error ("unrecognized command line option \"%s\"", opt);
804 /* Parse command line options and set default flag values. Do minimal
805 options processing. */
807 decode_options (unsigned int argc, const char **argv)
809 unsigned int i, lang_mask;
811 /* Perform language-specific options initialization. */
812 lang_mask = lang_hooks.init_options (argc, argv);
814 lang_hooks.initialize_diagnostics (global_dc);
816 /* Scan to see what optimization level has been specified. That will
817 determine the default value of many flags. */
818 for (i = 1; i < argc; i++)
820 if (!strcmp (argv[i], "-O"))
825 else if (argv[i][0] == '-' && argv[i][1] == 'O')
827 /* Handle -Os, -O2, -O3, -O69, ... */
828 const char *p = &argv[i][2];
830 if ((p[0] == 's') && (p[1] == 0))
834 /* Optimizing for size forces optimize to be 2. */
839 const int optimize_val = read_integral_parameter (p, p - 2, -1);
840 if (optimize_val != -1)
842 optimize = optimize_val;
851 flag_merge_constants = 0;
854 if (!no_unit_at_a_time_default)
856 flag_unit_at_a_time = 1;
858 flag_toplevel_reorder = 0;
865 flag_delayed_branch = 1;
867 #ifdef CAN_DEBUG_WITHOUT_FP
868 flag_omit_frame_pointer = 1;
870 flag_guess_branch_prob = 1;
871 flag_cprop_registers = 1;
872 flag_if_conversion = 1;
873 flag_if_conversion2 = 1;
874 flag_ipa_pure_const = 1;
875 flag_ipa_reference = 1;
876 flag_split_wide_types = 1;
883 flag_tree_copyrename = 1;
885 flag_tree_copy_prop = 1;
890 /* Loop header copying usually increases size of the code. This used
891 not to be true, since quite often it is possible to verify that
892 the condition is satisfied in the first iteration and therefore
893 to eliminate it. Jump threading handles these cases now. */
900 flag_inline_small_functions = 1;
901 flag_thread_jumps = 1;
902 flag_crossjumping = 1;
903 flag_optimize_sibling_calls = 1;
904 flag_forward_propagate = 1;
905 flag_cse_follow_jumps = 1;
907 flag_expensive_optimizations = 1;
908 flag_rerun_cse_after_loop = 1;
909 flag_caller_saves = 1;
911 #ifdef INSN_SCHEDULING
912 flag_schedule_insns = 1;
913 flag_schedule_insns_after_reload = 1;
916 flag_strict_aliasing = 1;
917 flag_strict_overflow = 1;
918 flag_delete_null_pointer_checks = 1;
919 flag_reorder_blocks = 1;
920 flag_reorder_functions = 1;
921 flag_tree_store_ccp = 1;
923 flag_tree_switch_conversion = 1;
927 /* Conditional DCE generates bigger code. */
928 flag_tree_builtin_call_dce = 1;
929 /* PRE tends to generate bigger code. */
933 /* Allow more virtual operators to increase alias precision. */
934 set_param_value ("max-aliased-vops", 500);
936 /* Track fields in field-sensitive alias analysis. */
937 set_param_value ("max-fields-for-field-sensitive", 100);
942 flag_predictive_commoning = 1;
943 flag_inline_functions = 1;
944 flag_unswitch_loops = 1;
945 flag_gcse_after_reload = 1;
946 flag_tree_vectorize = 1;
948 /* Allow even more virtual operators. */
949 set_param_value ("max-aliased-vops", 1000);
950 set_param_value ("avg-aliased-vops", 3);
953 if (optimize < 2 || optimize_size)
960 /* Don't reorder blocks when optimizing for size because extra
961 jump insns may be created; also barrier may create extra padding.
963 More correctly we should have a block reordering mode that tried
964 to minimize the combined size of all the jumps. This would more
965 or less automatically remove extra jumps, but would also try to
966 use more short jumps instead of long jumps. */
967 flag_reorder_blocks = 0;
968 flag_reorder_blocks_and_partition = 0;
973 /* Inlining of functions reducing size is a good idea regardless
974 of them being declared inline. */
975 flag_inline_functions = 1;
977 /* We want to crossjump as much as possible. */
978 set_param_value ("min-crossjump-insns", 1);
981 /* Initialize whether `char' is signed. */
982 flag_signed_char = DEFAULT_SIGNED_CHAR;
983 /* Set this to a special "uninitialized" value. The actual default is set
984 after target options have been processed. */
985 flag_short_enums = 2;
987 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
989 target_flags = targetm.default_target_flags;
991 /* Some targets have ABI-specified unwind tables. */
992 flag_unwind_tables = targetm.unwind_tables_default;
994 #ifdef OPTIMIZATION_OPTIONS
995 /* Allow default optimizations to be specified on a per-machine basis. */
996 OPTIMIZATION_OPTIONS (optimize, optimize_size);
999 handle_options (argc, argv, lang_mask);
1002 flag_pic = flag_pie;
1003 if (flag_pic && !flag_pie)
1006 if (flag_no_inline == 2)
1009 flag_really_no_inline = flag_no_inline;
1011 /* Set flag_no_inline before the post_options () hook. The C front
1012 ends use it to determine tree inlining defaults. FIXME: such
1013 code should be lang-independent when all front ends use tree
1014 inlining, in which case it, and this condition, should be moved
1015 to the top of process_options() instead. */
1018 /* Inlining does not work if not optimizing,
1019 so force it not to be done. */
1023 /* The c_decode_option function and decode_option hook set
1024 this to `2' if -Wall is used, so we can avoid giving out
1025 lots of errors for people who don't realize what -Wall does. */
1026 if (warn_uninitialized == 1)
1027 warning (OPT_Wuninitialized,
1028 "-Wuninitialized is not supported without -O");
1031 if (flag_really_no_inline == 2)
1032 flag_really_no_inline = flag_no_inline;
1034 /* Inlining of functions called just once will only work if we can look
1035 at the complete translation unit. */
1036 if (flag_inline_functions_called_once && !flag_unit_at_a_time)
1038 flag_inline_functions_called_once = 0;
1039 warning (OPT_Wdisabled_optimization,
1040 "-funit-at-a-time is required for inlining of functions "
1041 "that are only called once");
1044 /* The optimization to partition hot and cold basic blocks into separate
1045 sections of the .o and executable files does not work (currently)
1046 with exception handling. This is because there is no support for
1047 generating unwind info. If flag_exceptions is turned on we need to
1048 turn off the partitioning optimization. */
1050 if (flag_exceptions && flag_reorder_blocks_and_partition)
1053 ("-freorder-blocks-and-partition does not work with exceptions");
1054 flag_reorder_blocks_and_partition = 0;
1055 flag_reorder_blocks = 1;
1058 /* If user requested unwind info, then turn off the partitioning
1061 if (flag_unwind_tables && ! targetm.unwind_tables_default
1062 && flag_reorder_blocks_and_partition)
1064 inform ("-freorder-blocks-and-partition does not support unwind info");
1065 flag_reorder_blocks_and_partition = 0;
1066 flag_reorder_blocks = 1;
1069 /* If the target requested unwind info, then turn off the partitioning
1070 optimization with a different message. Likewise, if the target does not
1071 support named sections. */
1073 if (flag_reorder_blocks_and_partition
1074 && (!targetm.have_named_sections
1075 || (flag_unwind_tables && targetm.unwind_tables_default)))
1078 ("-freorder-blocks-and-partition does not work on this architecture");
1079 flag_reorder_blocks_and_partition = 0;
1080 flag_reorder_blocks = 1;
1084 #define LEFT_COLUMN 27
1086 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1087 followed by word-wrapped HELP in a second column. */
1089 wrap_help (const char *help,
1091 unsigned int item_width,
1092 unsigned int columns)
1094 unsigned int col_width = LEFT_COLUMN;
1095 unsigned int remaining, room, len;
1097 remaining = strlen (help);
1101 room = columns - 3 - MAX (col_width, item_width);
1110 for (i = 0; help[i]; i++)
1112 if (i >= room && len != remaining)
1116 else if ((help[i] == '-' || help[i] == '/')
1117 && help[i + 1] != ' '
1118 && i > 0 && ISALPHA (help[i - 1]))
1123 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1125 while (help[len] == ' ')
1133 /* Print help for a specific front-end, etc. */
1135 print_filtered_help (unsigned int include_flags,
1136 unsigned int exclude_flags,
1137 unsigned int any_flags,
1138 unsigned int columns)
1142 static char *printed = NULL;
1144 bool displayed = false;
1146 if (include_flags == CL_PARAMS)
1148 for (i = 0; i < LAST_PARAM; i++)
1150 const char *param = compiler_params[i].option;
1152 help = compiler_params[i].help;
1153 if (help == NULL || *help == '\0')
1155 if (exclude_flags & CL_UNDOCUMENTED)
1157 help = undocumented_msg;
1160 /* Get the translation. */
1163 wrap_help (help, param, strlen (param), columns);
1170 printed = XCNEWVAR (char, cl_options_count);
1172 for (i = 0; i < cl_options_count; i++)
1174 static char new_help[128];
1175 const struct cl_option *option = cl_options + i;
1180 if (include_flags == 0
1181 || ((option->flags & include_flags) != include_flags))
1183 if ((option->flags & any_flags) == 0)
1187 /* Skip unwanted switches. */
1188 if ((option->flags & exclude_flags) != 0)
1192 /* Skip switches that have already been printed. */
1198 help = option->help;
1201 if (exclude_flags & CL_UNDOCUMENTED)
1203 help = undocumented_msg;
1206 /* Get the translation. */
1209 /* Find the gap between the name of the
1210 option and its descriptive text. */
1211 tab = strchr (help, '\t');
1220 opt = option->opt_text;
1224 /* With the -Q option enabled we change the descriptive text associated
1225 with an option to be an indication of its current setting. */
1228 if (len < (LEFT_COLUMN + 2))
1229 strcpy (new_help, "\t\t");
1231 strcpy (new_help, "\t");
1233 if (option->flag_var != NULL)
1235 if (option->flags & CL_JOINED)
1237 if (option->var_type == CLVC_STRING)
1239 if (* (const char **) option->flag_var != NULL)
1240 snprintf (new_help + strlen (new_help),
1241 sizeof (new_help) - strlen (new_help),
1242 * (const char **) option->flag_var);
1245 sprintf (new_help + strlen (new_help),
1246 "%#x", * (int *) option->flag_var);
1249 strcat (new_help, option_enabled (i)
1250 ? _("[enabled]") : _("[disabled]"));
1256 wrap_help (help, opt, len, columns);
1262 unsigned int langs = include_flags & CL_LANG_ALL;
1265 printf (_(" No options with the desired characteristics were found\n"));
1270 /* PR 31349: Tell the user how to see all of the
1271 options supported by a specific front end. */
1272 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1273 if ((1U << i) & langs)
1274 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1275 lang_names[i], lang_names[i]);
1279 else if (! displayed)
1280 printf (_(" All options with the desired characteristics have already been displayed\n"));
1285 /* Display help for a specified type of option.
1286 The options must have ALL of the INCLUDE_FLAGS set
1287 ANY of the flags in the ANY_FLAGS set
1288 and NONE of the EXCLUDE_FLAGS set. */
1290 print_specific_help (unsigned int include_flags,
1291 unsigned int exclude_flags,
1292 unsigned int any_flags)
1294 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1295 const char * description = NULL;
1296 const char * descrip_extra = "";
1299 static unsigned int columns = 0;
1301 /* Sanity check: Make sure that we do not have more
1302 languages than we have bits available to enumerate them. */
1303 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1305 /* If we have not done so already, obtain
1306 the desired maximum width of the output. */
1311 GET_ENVIRONMENT (p, "COLUMNS");
1314 int value = atoi (p);
1321 /* Use a reasonable default. */
1325 /* Decide upon the title for the options that we are going to display. */
1326 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1328 switch (flag & include_flags)
1334 description = _("The following options are target specific");
1337 description = _("The following options control compiler warning messages");
1339 case CL_OPTIMIZATION:
1340 description = _("The following options control optimizations");
1343 description = _("The following options are language-independent");
1346 description = _("The --param option recognizes the following as parameters");
1349 if (i >= cl_lang_count)
1351 if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
1352 description = _("The following options are specific to just the language ");
1354 description = _("The following options are supported by the language ");
1355 descrip_extra = lang_names [i];
1360 if (description == NULL)
1364 if (include_flags == CL_UNDOCUMENTED)
1365 description = _("The following options are not documented");
1368 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1375 if (any_flags & all_langs_mask)
1376 description = _("The following options are language-related");
1378 description = _("The following options are language-independent");
1382 printf ("%s%s:\n", description, descrip_extra);
1383 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1386 /* Handle target- and language-independent options. Return zero to
1387 generate an "unknown option" message. Only options that need
1388 extra handling need to be listed here; if you simply want
1389 VALUE assigned to a variable, it happens automatically. */
1392 common_handle_option (size_t scode, const char *arg, int value,
1393 unsigned int lang_mask)
1395 static bool verbose = false;
1396 enum opt_code code = (enum opt_code) scode;
1411 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1412 unsigned int undoc_mask;
1415 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1416 /* First display any single language specific options. */
1417 for (i = 0; i < cl_lang_count; i++)
1419 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1420 /* Next display any multi language specific options. */
1421 print_specific_help (0, undoc_mask, all_langs_mask);
1422 /* Then display any remaining, non-language options. */
1423 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1424 print_specific_help (i, undoc_mask, 0);
1425 exit_after_options = true;
1429 case OPT_ftarget_help:
1430 case OPT__target_help:
1431 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1432 exit_after_options = true;
1434 /* Allow the target a chance to give the user some additional information. */
1435 if (targetm.target_help)
1436 targetm.target_help ();
1442 const char * a = arg;
1443 unsigned int include_flags = 0;
1444 /* Note - by default we include undocumented options when listing
1445 specific classes. If you only want to see documented options
1446 then add ",^undocumented" to the --help= option. E.g.:
1448 --help=target,^undocumented */
1449 unsigned int exclude_flags = 0;
1451 /* Walk along the argument string, parsing each word in turn.
1453 arg = [^]{word}[,{arg}]
1454 word = {optimizers|target|warnings|undocumented|
1455 params|common|<language>} */
1460 const char * string;
1465 { "optimizers", CL_OPTIMIZATION },
1466 { "target", CL_TARGET },
1467 { "warnings", CL_WARNING },
1468 { "undocumented", CL_UNDOCUMENTED },
1469 { "params", CL_PARAMS },
1470 { "joined", CL_JOINED },
1471 { "separate", CL_SEPARATE },
1472 { "common", CL_COMMON },
1475 unsigned int * pflags;
1477 unsigned int lang_flag, specific_flag;
1484 pflags = & exclude_flags;
1487 pflags = & include_flags;
1489 comma = strchr (a, ',');
1495 /* Check to see if the string matches an option class name. */
1496 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1497 if (strncasecmp (a, specifics[i].string, len) == 0)
1499 specific_flag = specifics[i].flag;
1503 /* Check to see if the string matches a language name.
1504 Note - we rely upon the alpha-sorted nature of the entries in
1505 the lang_names array, specifically that shorter names appear
1506 before their longer variants. (i.e. C before C++). That way
1507 when we are attempting to match --help=c for example we will
1508 match with C first and not C++. */
1509 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1510 if (strncasecmp (a, lang_names[i], len) == 0)
1512 lang_flag = 1U << i;
1516 if (specific_flag != 0)
1519 * pflags |= specific_flag;
1522 /* The option's argument matches both the start of a
1523 language name and the start of an option class name.
1524 We have a special case for when the user has
1525 specified "--help=c", but otherwise we have to issue
1527 if (strncasecmp (a, "c", len) == 0)
1528 * pflags |= lang_flag;
1531 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1535 else if (lang_flag != 0)
1536 * pflags |= lang_flag;
1539 "warning: unrecognized argument to --help= option: %.*s\n",
1548 print_specific_help (include_flags, exclude_flags, 0);
1549 exit_after_options = true;
1554 print_version (stderr, "");
1555 exit_after_options = true;
1559 g_switch_value = value;
1560 g_switch_set = true;
1565 /* Currently handled in a prescan. */
1569 /* For backward compatibility, -W is the same as -Wextra. */
1573 case OPT_Wdisallowed_function_list_:
1574 warn_disallowed_functions = true;
1575 add_comma_separated_to_vector
1576 (&warning_disallowed_functions, arg);
1580 enable_warning_as_error (arg, value, lang_mask);
1587 case OPT_Wlarger_than_:
1588 /* This form corresponds to -Wlarger-than-.
1589 Kept for backward compatibility.
1590 Don't use it as the first argument of warning(). */
1592 case OPT_Wlarger_than_eq:
1593 larger_than_size = value;
1594 warn_larger_than = value != -1;
1597 case OPT_Wframe_larger_than_:
1598 frame_larger_than_size = value;
1599 warn_frame_larger_than = value != -1;
1602 case OPT_Wstrict_aliasing:
1603 set_Wstrict_aliasing (value);
1606 case OPT_Wstrict_aliasing_:
1607 warn_strict_aliasing = value;
1610 case OPT_Wstrict_overflow:
1611 warn_strict_overflow = (value
1612 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1616 case OPT_Wstrict_overflow_:
1617 warn_strict_overflow = value;
1621 set_Wunused (value);
1626 aux_info_file_name = arg;
1627 flag_gen_aux_info = 1;
1631 aux_base_name = arg;
1634 case OPT_auxbase_strip:
1636 char *tmp = xstrdup (arg);
1637 strip_off_ending (tmp, strlen (tmp));
1639 aux_base_name = tmp;
1644 decode_d_option (arg);
1648 dump_base_name = arg;
1651 case OPT_falign_functions_:
1652 align_functions = value;
1655 case OPT_falign_jumps_:
1656 align_jumps = value;
1659 case OPT_falign_labels_:
1660 align_labels = value;
1663 case OPT_falign_loops_:
1664 align_loops = value;
1667 case OPT_fbranch_probabilities:
1668 flag_branch_probabilities_set = true;
1671 case OPT_fcall_used_:
1672 fix_register (arg, 0, 1);
1675 case OPT_fcall_saved_:
1676 fix_register (arg, 0, 0);
1680 dbg_cnt_process_opt (arg);
1683 case OPT_fdbg_cnt_list:
1684 dbg_cnt_list_all_counters ();
1687 case OPT_fdebug_prefix_map_:
1688 add_debug_prefix_map (arg);
1691 case OPT_fdiagnostics_show_location_:
1692 if (!strcmp (arg, "once"))
1693 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1694 else if (!strcmp (arg, "every-line"))
1695 diagnostic_prefixing_rule (global_dc)
1696 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1701 case OPT_fdiagnostics_show_option:
1702 global_dc->show_option_requested = true;
1706 if (!dump_switch_p (arg))
1710 case OPT_ffast_math:
1711 set_fast_math_flags (value);
1714 case OPT_funsafe_math_optimizations:
1715 set_unsafe_math_optimizations_flags (value);
1719 fix_register (arg, 1, 1);
1722 case OPT_finline_limit_:
1723 case OPT_finline_limit_eq:
1724 set_param_value ("max-inline-insns-single", value / 2);
1725 set_param_value ("max-inline-insns-auto", value / 2);
1728 case OPT_finstrument_functions_exclude_function_list_:
1729 add_comma_separated_to_vector
1730 (&flag_instrument_functions_exclude_functions, arg);
1733 case OPT_finstrument_functions_exclude_file_list_:
1734 add_comma_separated_to_vector
1735 (&flag_instrument_functions_exclude_files, arg);
1738 case OPT_fmessage_length_:
1739 pp_set_line_maximum_length (global_dc->printer, value);
1742 case OPT_fpack_struct_:
1743 if (value <= 0 || (value & (value - 1)) || value > 16)
1744 error ("structure alignment must be a small power of two, not %d", value);
1747 initial_max_fld_align = value;
1748 maximum_field_alignment = value * BITS_PER_UNIT;
1752 case OPT_fpeel_loops:
1753 flag_peel_loops_set = true;
1756 case OPT_fprofile_arcs:
1757 profile_arc_flag_set = true;
1760 case OPT_finline_functions:
1761 flag_inline_functions_set = true;
1764 case OPT_fprofile_dir_:
1765 profile_data_prefix = xstrdup (arg);
1768 case OPT_fprofile_use_:
1769 profile_data_prefix = xstrdup (arg);
1770 flag_profile_use = true;
1772 /* No break here - do -fprofile-use processing. */
1773 case OPT_fprofile_use:
1774 if (!flag_branch_probabilities_set)
1775 flag_branch_probabilities = value;
1776 if (!flag_profile_values_set)
1777 flag_profile_values = value;
1778 if (!flag_unroll_loops_set)
1779 flag_unroll_loops = value;
1780 if (!flag_peel_loops_set)
1781 flag_peel_loops = value;
1782 if (!flag_tracer_set)
1783 flag_tracer = value;
1784 if (!flag_value_profile_transformations_set)
1785 flag_value_profile_transformations = value;
1786 if (!flag_inline_functions_set)
1787 flag_inline_functions = value;
1790 case OPT_fprofile_generate_:
1791 profile_data_prefix = xstrdup (arg);
1793 /* No break here - do -fprofile-generate processing. */
1794 case OPT_fprofile_generate:
1795 if (!profile_arc_flag_set)
1796 profile_arc_flag = value;
1797 if (!flag_profile_values_set)
1798 flag_profile_values = value;
1799 if (!flag_value_profile_transformations_set)
1800 flag_value_profile_transformations = value;
1801 if (!flag_inline_functions_set)
1802 flag_inline_functions = value;
1805 case OPT_fprofile_values:
1806 flag_profile_values_set = true;
1809 case OPT_fvisibility_:
1811 if (!strcmp(arg, "default"))
1812 default_visibility = VISIBILITY_DEFAULT;
1813 else if (!strcmp(arg, "internal"))
1814 default_visibility = VISIBILITY_INTERNAL;
1815 else if (!strcmp(arg, "hidden"))
1816 default_visibility = VISIBILITY_HIDDEN;
1817 else if (!strcmp(arg, "protected"))
1818 default_visibility = VISIBILITY_PROTECTED;
1820 error ("unrecognized visibility value \"%s\"", arg);
1825 flag_value_profile_transformations_set = true;
1828 case OPT_frandom_seed:
1829 /* The real switch is -fno-random-seed. */
1832 set_random_seed (NULL);
1835 case OPT_frandom_seed_:
1836 set_random_seed (arg);
1839 case OPT_fsched_verbose_:
1840 #ifdef INSN_SCHEDULING
1841 fix_sched_param ("verbose", arg);
1847 case OPT_fsched_stalled_insns_:
1848 flag_sched_stalled_insns = value;
1849 if (flag_sched_stalled_insns == 0)
1850 flag_sched_stalled_insns = -1;
1853 case OPT_fsched_stalled_insns_dep_:
1854 flag_sched_stalled_insns_dep = value;
1857 case OPT_fstack_limit:
1858 /* The real switch is -fno-stack-limit. */
1861 stack_limit_rtx = NULL_RTX;
1864 case OPT_fstack_limit_register_:
1866 int reg = decode_reg_name (arg);
1868 error ("unrecognized register name \"%s\"", arg);
1870 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1874 case OPT_fstack_limit_symbol_:
1875 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1878 case OPT_ftree_vectorizer_verbose_:
1879 vect_set_verbosity_level (arg);
1882 case OPT_ftls_model_:
1883 if (!strcmp (arg, "global-dynamic"))
1884 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1885 else if (!strcmp (arg, "local-dynamic"))
1886 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1887 else if (!strcmp (arg, "initial-exec"))
1888 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1889 else if (!strcmp (arg, "local-exec"))
1890 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1892 warning (0, "unknown tls-model \"%s\"", arg);
1896 flag_tracer_set = true;
1899 case OPT_funroll_loops:
1900 flag_unroll_loops_set = true;
1904 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1908 set_debug_level (SDB_DEBUG, false, arg);
1912 set_debug_level (DWARF2_DEBUG, false, arg);
1916 set_debug_level (NO_DEBUG, 2, arg);
1921 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1925 set_debug_level (VMS_DEBUG, false, arg);
1930 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1934 asm_file_name = arg;
1937 case OPT_pedantic_errors:
1938 flag_pedantic_errors = pedantic = 1;
1941 case OPT_floop_optimize:
1942 case OPT_frerun_loop_opt:
1943 case OPT_fstrength_reduce:
1944 case OPT_ftree_store_copy_prop:
1945 case OPT_fforce_addr:
1946 case OPT_ftree_salias:
1947 /* These are no-ops, preserved for backward compatibility. */
1951 /* If the flag was handled in a standard way, assume the lack of
1952 processing here is intentional. */
1953 gcc_assert (cl_options[scode].flag_var);
1960 /* Handle --param NAME=VALUE. */
1962 handle_param (const char *carg)
1967 arg = xstrdup (carg);
1968 equal = strchr (arg, '=');
1970 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1973 value = integral_argument (equal + 1);
1975 error ("invalid --param value %qs", equal + 1);
1979 set_param_value (arg, value);
1986 /* Handle -W and -Wextra. */
1988 set_Wextra (int setting)
1990 extra_warnings = setting;
1991 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1993 /* We save the value of warn_uninitialized, since if they put
1994 -Wuninitialized on the command line, we need to generate a
1995 warning about not using it without also specifying -O. */
1997 warn_uninitialized = 0;
1998 else if (warn_uninitialized != 1)
1999 warn_uninitialized = 2;
2002 /* Initialize unused warning flags. */
2004 set_Wunused (int setting)
2006 warn_unused_function = setting;
2007 warn_unused_label = setting;
2008 /* Unused function parameter warnings are reported when either
2009 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
2010 Thus, if -Wextra has already been seen, set warn_unused_parameter;
2011 otherwise set maybe_warn_extra_parameter, which will be picked up
2013 maybe_warn_unused_parameter = setting;
2014 warn_unused_parameter = (setting && extra_warnings);
2015 warn_unused_variable = setting;
2016 warn_unused_value = setting;
2019 /* Used to set the level of strict aliasing warnings,
2020 when no level is specified (i.e., when -Wstrict-aliasing, and not
2021 -Wstrict-aliasing=level was given).
2022 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2023 and 0 otherwise. After calling this function, wstrict_aliasing will be
2024 set to the default value of -Wstrict_aliasing=level, currently 3. */
2026 set_Wstrict_aliasing (int onoff)
2028 gcc_assert (onoff == 0 || onoff == 1);
2030 warn_strict_aliasing = 3;
2032 warn_strict_aliasing = 0;
2035 /* The following routines are useful in setting all the flags that
2036 -ffast-math and -fno-fast-math imply. */
2038 set_fast_math_flags (int set)
2040 flag_unsafe_math_optimizations = set;
2041 set_unsafe_math_optimizations_flags (set);
2042 flag_finite_math_only = set;
2043 flag_errno_math = !set;
2046 flag_signaling_nans = 0;
2047 flag_rounding_math = 0;
2048 flag_cx_limited_range = 1;
2052 /* When -funsafe-math-optimizations is set the following
2053 flags are set as well. */
2055 set_unsafe_math_optimizations_flags (int set)
2057 flag_trapping_math = !set;
2058 flag_signed_zeros = !set;
2059 flag_associative_math = set;
2060 flag_reciprocal_math = set;
2063 /* Return true iff flags are set as if -ffast-math. */
2065 fast_math_flags_set_p (void)
2067 return (!flag_trapping_math
2068 && flag_unsafe_math_optimizations
2069 && flag_finite_math_only
2070 && !flag_signed_zeros
2071 && !flag_errno_math);
2074 /* Handle a debug output -g switch. EXTENDED is true or false to support
2075 extended output (2 is special and means "-ggdb" was given). */
2077 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2079 static bool type_explicit;
2081 use_gnu_debug_info_extensions = extended;
2083 if (type == NO_DEBUG)
2085 if (write_symbols == NO_DEBUG)
2087 write_symbols = PREFERRED_DEBUGGING_TYPE;
2091 #ifdef DWARF2_DEBUGGING_INFO
2092 write_symbols = DWARF2_DEBUG;
2093 #elif defined DBX_DEBUGGING_INFO
2094 write_symbols = DBX_DEBUG;
2098 if (write_symbols == NO_DEBUG)
2099 warning (0, "target system does not support debug output");
2104 /* Does it conflict with an already selected type? */
2105 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2106 error ("debug format \"%s\" conflicts with prior selection",
2107 debug_type_names[type]);
2108 write_symbols = type;
2109 type_explicit = true;
2112 /* A debug flag without a level defaults to level 2. */
2115 if (!debug_info_level)
2116 debug_info_level = 2;
2120 debug_info_level = integral_argument (arg);
2121 if (debug_info_level == (unsigned int) -1)
2122 error ("unrecognised debug output level \"%s\"", arg);
2123 else if (debug_info_level > 3)
2124 error ("debug output level %s is too high", arg);
2128 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2129 a simple on-off switch. */
2132 option_enabled (int opt_idx)
2134 const struct cl_option *option = &(cl_options[opt_idx]);
2136 if (option->flag_var)
2137 switch (option->var_type)
2140 return *(int *) option->flag_var != 0;
2143 return *(int *) option->flag_var == option->var_value;
2145 case CLVC_BIT_CLEAR:
2146 return (*(int *) option->flag_var & option->var_value) == 0;
2149 return (*(int *) option->flag_var & option->var_value) != 0;
2157 /* Fill STATE with the current state of option OPTION. Return true if
2158 there is some state to store. */
2161 get_option_state (int option, struct cl_option_state *state)
2163 if (cl_options[option].flag_var == 0)
2166 switch (cl_options[option].var_type)
2170 state->data = cl_options[option].flag_var;
2171 state->size = sizeof (int);
2174 case CLVC_BIT_CLEAR:
2176 state->ch = option_enabled (option);
2177 state->data = &state->ch;
2182 state->data = *(const char **) cl_options[option].flag_var;
2183 if (state->data == 0)
2185 state->size = strlen ((const char *) state->data) + 1;
2191 /* Enable a warning option as an error. This is used by -Werror= and
2192 also by legacy Werror-implicit-function-declaration. */
2195 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2200 new_option = XNEWVEC (char, strlen (arg) + 2);
2201 new_option[0] = 'W';
2202 strcpy (new_option + 1, arg);
2203 option_index = find_opt (new_option, lang_mask);
2204 if (option_index == N_OPTS)
2206 error ("-Werror=%s: No option -%s", arg, new_option);
2210 int kind = value ? DK_ERROR : DK_WARNING;
2211 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2213 /* -Werror=foo implies -Wfoo. */
2214 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2215 && cl_options[option_index].flag_var
2216 && kind == DK_ERROR)
2217 *(int *) cl_options[option_index].flag_var = 1;