1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
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"
32 #include "langhooks.h"
38 #include "diagnostic.h"
39 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "tree-pass.h"
47 #include "lto-streamer.h"
49 /* Value of the -G xx switch, and whether it was passed or not. */
50 unsigned HOST_WIDE_INT g_switch_value;
53 /* Same for selective scheduling. */
54 bool sel_sched_switch_set;
56 /* True if we should exit after parsing options. */
57 bool exit_after_options;
59 /* True to warn about any objects definitions whose size is larger
60 than N bytes. Also want about function definitions whose returned
61 values are larger than N bytes, where N is `larger_than_size'. */
62 bool warn_larger_than;
63 HOST_WIDE_INT larger_than_size;
65 /* True to warn about any function whose frame size is larger
67 bool warn_frame_larger_than;
68 HOST_WIDE_INT frame_larger_than_size;
70 /* Type(s) of debugging information we are producing (if any). See
71 flags.h for the definitions of the different possible types of
72 debugging information. */
73 enum debug_info_type write_symbols = NO_DEBUG;
75 /* Level of debugging information we are producing. See flags.h for
76 the definitions of the different possible levels. */
77 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
79 /* A major contribution to object and executable size is debug
80 information size. A major contribution to debug information size
81 is struct descriptions replicated in several object files. The
82 following flags attempt to reduce this information. The basic
83 idea is to not emit struct debugging information in the current
84 compilation unit when that information will be generated by
85 another compilation unit.
87 Debug information for a struct defined in the current source
88 file should be generated in the object file. Likewise the
89 debug information for a struct defined in a header should be
90 generated in the object file of the corresponding source file.
91 Both of these case are handled when the base name of the file of
92 the struct definition matches the base name of the source file
93 of the current compilation unit. This matching emits minimal
94 struct debugging information.
96 The base file name matching rule above will fail to emit debug
97 information for structs defined in system headers. So a second
98 category of files includes system headers in addition to files
101 The remaining types of files are library headers and application
102 headers. We cannot currently distinguish these two types. */
104 enum debug_struct_file
106 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
107 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
108 same base name as the compilation unit. */
109 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
111 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
114 /* Generic structs (e.g. templates not explicitly specialized)
115 may not have a compilation unit associated with them, and so
116 may need to be treated differently from ordinary structs.
118 Structs only handled by reference (indirectly), will also usually
119 not need as much debugging information. */
121 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
122 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
123 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
124 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
126 /* Parse the -femit-struct-debug-detailed option value
127 and set the flag variables. */
129 #define MATCH( prefix, string ) \
130 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
131 ? ((string += sizeof prefix - 1), 1) : 0)
134 set_struct_debug_option (const char *spec)
136 /* various labels for comparison */
137 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
138 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
139 static char none_lbl[] = "none", any_lbl[] = "any";
140 static char base_lbl[] = "base", sys_lbl[] = "sys";
142 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
143 /* Default is to apply to as much as possible. */
144 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
145 int ord = 1, gen = 1;
148 if (MATCH (dfn_lbl, spec))
149 usage = DINFO_USAGE_DFN;
150 else if (MATCH (dir_lbl, spec))
151 usage = DINFO_USAGE_DIR_USE;
152 else if (MATCH (ind_lbl, spec))
153 usage = DINFO_USAGE_IND_USE;
155 /* Generics or not? */
156 if (MATCH (ord_lbl, spec))
158 else if (MATCH (gen_lbl, spec))
161 /* What allowable environment? */
162 if (MATCH (none_lbl, spec))
163 files = DINFO_STRUCT_FILE_NONE;
164 else if (MATCH (any_lbl, spec))
165 files = DINFO_STRUCT_FILE_ANY;
166 else if (MATCH (sys_lbl, spec))
167 files = DINFO_STRUCT_FILE_SYS;
168 else if (MATCH (base_lbl, spec))
169 files = DINFO_STRUCT_FILE_BASE;
171 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
174 /* Effect the specification. */
175 if (usage == DINFO_USAGE_NUM_ENUMS)
179 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
180 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
181 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
185 debug_struct_generic[DINFO_USAGE_DFN] = files;
186 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
187 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
193 debug_struct_ordinary[usage] = files;
195 debug_struct_generic[usage] = files;
199 set_struct_debug_option (spec+1);
202 /* No more -femit-struct-debug-detailed specifications.
205 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
207 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
208 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
209 || debug_struct_generic[DINFO_USAGE_DIR_USE]
210 < debug_struct_generic[DINFO_USAGE_IND_USE])
211 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
212 " as much as %<-femit-struct-debug-detailed=ind:...%>");
216 /* Find the base name of a path, stripping off both directories and
217 a single final extension. */
219 base_of_path (const char *path, const char **base_out)
221 const char *base = path;
223 const char *p = path;
227 if (IS_DIR_SEPARATOR(c))
242 /* Match the base name of a file to the base name of a compilation unit. */
244 static const char *main_input_basename;
245 static int main_input_baselength;
248 matches_main_base (const char *path)
250 /* Cache the last query. */
251 static const char *last_path = NULL;
252 static int last_match = 0;
253 if (path != last_path)
256 int length = base_of_path (path, &base);
258 last_match = (length == main_input_baselength
259 && memcmp (base, main_input_basename, length) == 0);
264 #ifdef DEBUG_DEBUG_STRUCT
267 dump_struct_debug (tree type, enum debug_info_usage usage,
268 enum debug_struct_file criterion, int generic,
269 int matches, int result)
271 /* Find the type name. */
272 tree type_decl = TYPE_STUB_DECL (type);
274 const char *name = 0;
275 if (TREE_CODE (t) == TYPE_DECL)
278 name = IDENTIFIER_POINTER (t);
280 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
282 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
283 matches ? "bas" : "hdr",
284 generic ? "gen" : "ord",
285 usage == DINFO_USAGE_DFN ? ";" :
286 usage == DINFO_USAGE_DIR_USE ? "." : "*",
288 (void*) type_decl, name);
291 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
292 dump_struct_debug (type, usage, criterion, generic, matches, result)
296 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
303 should_emit_struct_debug (tree type, enum debug_info_usage usage)
305 enum debug_struct_file criterion;
307 bool generic = lang_hooks.types.generic_p (type);
310 criterion = debug_struct_generic[usage];
312 criterion = debug_struct_ordinary[usage];
314 if (criterion == DINFO_STRUCT_FILE_NONE)
315 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
316 if (criterion == DINFO_STRUCT_FILE_ANY)
317 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
319 type_decl = TYPE_STUB_DECL (type);
321 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
322 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
324 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
325 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
326 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
329 /* Nonzero means use GNU-only extensions in the generated symbolic
330 debugging information. Currently, this only has an effect when
331 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
332 bool use_gnu_debug_info_extensions;
334 /* The default visibility for all symbols (unless overridden) */
335 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
337 /* Global visibility options. */
338 struct visibility_flags visibility_options;
340 /* What to print when a switch has no documentation. */
341 static const char undocumented_msg[] = N_("This switch lacks documentation");
343 /* Used for bookkeeping on whether user set these flags so
344 -fprofile-use/-fprofile-generate does not use them. */
345 static bool profile_arc_flag_set, flag_profile_values_set;
346 static bool flag_unroll_loops_set, flag_tracer_set;
347 static bool flag_value_profile_transformations_set;
348 static bool flag_peel_loops_set, flag_branch_probabilities_set;
349 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
350 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
352 /* Functions excluded from profiling. */
354 typedef char *char_p; /* For DEF_VEC_P. */
356 DEF_VEC_ALLOC_P(char_p,heap);
358 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
359 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
361 typedef const char *const_char_p; /* For DEF_VEC_P. */
362 DEF_VEC_P(const_char_p);
363 DEF_VEC_ALLOC_P(const_char_p,heap);
365 static VEC(const_char_p,heap) *ignored_options;
367 /* Language specific warning pass for unused results. */
368 bool flag_warn_unused_result = false;
370 /* Input file names. */
371 const char **in_fnames;
372 unsigned num_in_fnames;
374 static int common_handle_option (size_t scode, const char *arg, int value,
375 unsigned int lang_mask);
376 static void handle_param (const char *);
377 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
378 static char *write_langs (unsigned int lang_mask);
379 static void complain_wrong_lang (const char *, const struct cl_option *,
380 unsigned int lang_mask);
381 static void handle_options (unsigned int, const char **, unsigned int);
382 static void set_debug_level (enum debug_info_type type, int extended,
385 /* If ARG is a non-negative integer made up solely of digits, return its
386 value, otherwise return -1. */
388 integral_argument (const char *arg)
392 while (*p && ISDIGIT (*p))
401 /* Return a malloced slash-separated list of languages in MASK. */
403 write_langs (unsigned int mask)
405 unsigned int n = 0, len = 0;
406 const char *lang_name;
409 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
410 if (mask & (1U << n))
411 len += strlen (lang_name) + 1;
413 result = XNEWVEC (char, len);
415 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
416 if (mask & (1U << n))
420 strcpy (result + len, lang_name);
421 len += strlen (lang_name);
429 /* Complain that switch OPT_INDEX does not apply to this front end. */
431 complain_wrong_lang (const char *text, const struct cl_option *option,
432 unsigned int lang_mask)
434 char *ok_langs, *bad_lang;
436 /* The LTO front end inherits all the options from the first front
437 end that was used. However, not all the original front end
438 options make sense in LTO.
440 A real solution would be to filter this in collect2, but collect2
441 does not have access to all the option attributes to know what to
442 filter. So, in lto1 we silently accept inherited flags and do
444 if (lang_mask & CL_LTO)
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 set_option (option, value, arg);
615 if (option->flags & lang_mask)
617 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
620 lto_register_user_option (opt_index, arg, value, lang_mask);
623 if (result && (option->flags & CL_COMMON))
625 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
628 lto_register_user_option (opt_index, arg, value, CL_COMMON);
631 if (result && (option->flags & CL_TARGET))
633 if (!targetm.handle_option (opt_index, arg, value))
636 lto_register_user_option (opt_index, arg, value, CL_TARGET);
645 /* Handle FILENAME from the command line. */
647 add_input_filename (const char *filename)
650 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
651 in_fnames[num_in_fnames - 1] = filename;
654 /* Add comma-separated strings to a char_p vector. */
657 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
664 /* We never free this string. */
677 VEC_safe_push (char_p, heap, *pvec, token_start);
680 if (*r == '\\' && r[1] == ',')
688 if (*token_start != '\0')
689 VEC_safe_push (char_p, heap, *pvec, token_start);
692 /* Return whether we should exclude FNDECL from instrumentation. */
695 flag_instrument_functions_exclude_p (tree fndecl)
697 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
703 name = lang_hooks.decl_printable_name (fndecl, 0);
705 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
709 if (strstr (name, s) != NULL)
714 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
720 name = DECL_SOURCE_FILE (fndecl);
722 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
725 if (strstr (name, s) != NULL)
734 /* Decode and handle the vector of command line options. LANG_MASK
735 contains has a single bit set representing the current
738 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
742 for (i = 1; i < argc; i += n)
744 const char *opt = argv[i];
746 /* Interpret "-" or a non-switch as a file name. */
747 if (opt[0] != '-' || opt[1] == '\0')
749 if (main_input_filename == NULL)
751 main_input_filename = opt;
752 main_input_baselength
753 = base_of_path (main_input_filename, &main_input_basename);
755 add_input_filename (opt);
760 n = handle_option (argv + i, lang_mask);
765 error ("unrecognized command line option \"%s\"", opt);
770 /* Parse command line options and set default flag values. Do minimal
771 options processing. */
773 decode_options (unsigned int argc, const char **argv)
775 static bool first_time_p = true;
776 static int initial_min_crossjump_insns;
777 static int initial_max_fields_for_field_sensitive;
778 static int initial_loop_invariant_max_bbs_in_loop;
779 static unsigned int initial_lang_mask;
781 unsigned int i, lang_mask;
789 /* Perform language-specific options initialization. */
790 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
792 lang_hooks.initialize_diagnostics (global_dc);
794 /* Save initial values of parameters we reset. */
795 initial_min_crossjump_insns
796 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
797 initial_max_fields_for_field_sensitive
798 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
799 initial_loop_invariant_max_bbs_in_loop
800 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
803 lang_mask = initial_lang_mask;
805 /* Scan to see what optimization level has been specified. That will
806 determine the default value of many flags. */
807 for (i = 1; i < argc; i++)
809 if (!strcmp (argv[i], "-O"))
814 else if (argv[i][0] == '-' && argv[i][1] == 'O')
816 /* Handle -Os, -O2, -O3, -O69, ... */
817 const char *p = &argv[i][2];
819 if ((p[0] == 's') && (p[1] == 0))
823 /* Optimizing for size forces optimize to be 2. */
828 const int optimize_val = read_integral_parameter (p, p - 2, -1);
829 if (optimize_val != -1)
831 optimize = optimize_val;
832 if ((unsigned int) optimize > 255)
840 /* Use priority coloring if cover classes is not defined for the
842 if (targetm.ira_cover_classes == NULL)
843 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
845 /* -O1 optimizations. */
846 opt1 = (optimize >= 1);
847 flag_defer_pop = opt1;
849 flag_delayed_branch = opt1;
851 #ifdef CAN_DEBUG_WITHOUT_FP
852 flag_omit_frame_pointer = opt1;
854 flag_guess_branch_prob = opt1;
855 flag_cprop_registers = opt1;
856 flag_forward_propagate = opt1;
857 flag_if_conversion = opt1;
858 flag_if_conversion2 = opt1;
859 flag_ipa_pure_const = opt1;
860 flag_ipa_reference = opt1;
861 flag_ipa_profile = opt1;
862 flag_merge_constants = opt1;
863 flag_split_wide_types = opt1;
864 flag_tree_ccp = opt1;
865 flag_tree_dce = opt1;
866 flag_tree_dom = opt1;
867 flag_tree_dse = opt1;
868 flag_tree_ter = opt1;
869 flag_tree_sra = opt1;
870 flag_tree_copyrename = opt1;
871 flag_tree_fre = opt1;
872 flag_tree_copy_prop = opt1;
873 flag_tree_sink = opt1;
876 /* -O2 optimizations. */
877 opt2 = (optimize >= 2);
878 flag_inline_small_functions = opt2;
879 flag_indirect_inlining = opt2;
880 flag_thread_jumps = opt2;
881 flag_crossjumping = opt2;
882 flag_optimize_sibling_calls = opt2;
883 flag_cse_follow_jumps = opt2;
885 flag_expensive_optimizations = opt2;
886 flag_rerun_cse_after_loop = opt2;
887 flag_caller_saves = opt2;
888 flag_peephole2 = opt2;
889 #ifdef INSN_SCHEDULING
890 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
891 flag_schedule_insns = opt2 && ! optimize_size;
892 flag_schedule_insns_after_reload = opt2;
895 flag_strict_aliasing = opt2;
896 flag_strict_overflow = opt2;
897 flag_reorder_blocks = opt2;
898 flag_reorder_functions = opt2;
899 flag_tree_vrp = opt2;
900 flag_tree_builtin_call_dce = opt2;
901 flag_tree_pre = opt2;
902 flag_tree_switch_conversion = opt2;
906 /* Track fields in field-sensitive alias analysis. */
907 set_param_value ("max-fields-for-field-sensitive",
908 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
910 /* For -O1 only do loop invariant motion for very small loops. */
911 set_param_value ("loop-invariant-max-bbs-in-loop",
912 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
914 /* -O3 optimizations. */
915 opt3 = (optimize >= 3);
916 flag_predictive_commoning = opt3;
917 flag_inline_functions = opt3;
918 flag_unswitch_loops = opt3;
919 flag_gcse_after_reload = opt3;
920 flag_tree_vectorize = opt3;
921 flag_ipa_cp_clone = opt3;
922 if (flag_ipa_cp_clone)
925 /* Just -O1/-O0 optimizations. */
926 opt1_max = (optimize <= 1);
927 align_loops = opt1_max;
928 align_jumps = opt1_max;
929 align_labels = opt1_max;
930 align_functions = opt1_max;
934 /* Inlining of functions reducing size is a good idea regardless of them
935 being declared inline. */
936 flag_inline_functions = 1;
938 /* Basic optimization options. */
943 /* We want to crossjump as much as possible. */
944 set_param_value ("min-crossjump-insns", 1);
947 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
949 /* Enable -Werror=coverage-mismatch by default */
950 enable_warning_as_error("coverage-mismatch", 1, lang_mask);
954 /* Initialize whether `char' is signed. */
955 flag_signed_char = DEFAULT_SIGNED_CHAR;
956 /* Set this to a special "uninitialized" value. The actual default is
957 set after target options have been processed. */
958 flag_short_enums = 2;
960 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
962 target_flags = targetm.default_target_flags;
964 /* Some targets have ABI-specified unwind tables. */
965 flag_unwind_tables = targetm.unwind_tables_default;
968 /* Clear any options currently held for LTO. */
969 lto_clear_user_options ();
971 #ifdef OPTIMIZATION_OPTIONS
972 /* Allow default optimizations to be specified on a per-machine basis. */
973 OPTIMIZATION_OPTIONS (optimize, optimize_size);
976 handle_options (argc, argv, lang_mask);
978 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
980 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
981 directory. Then try to make DUMP_BASE_NAME relative to the
982 AUX_BASE_NAME directory, typically the directory to contain
985 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
986 else if (aux_base_name)
988 const char *aux_base;
990 base_of_path (aux_base_name, &aux_base);
991 if (aux_base_name != aux_base)
993 int dir_len = aux_base - aux_base_name;
994 char *new_dump_base_name =
995 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
997 /* Copy directory component from AUX_BASE_NAME. */
998 memcpy (new_dump_base_name, aux_base_name, dir_len);
999 /* Append existing DUMP_BASE_NAME. */
1000 strcpy (new_dump_base_name + dir_len, dump_base_name);
1001 dump_base_name = new_dump_base_name;
1006 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1008 if (!flag_unit_at_a_time)
1010 if (flag_section_anchors == 1)
1011 error ("Section anchors must be disabled when unit-at-a-time "
1013 flag_section_anchors = 0;
1014 if (flag_toplevel_reorder == 1)
1015 error ("Toplevel reorder must be disabled when unit-at-a-time "
1017 flag_toplevel_reorder = 0;
1019 /* Unless the user has asked for section anchors, we disable toplevel
1020 reordering at -O0 to disable transformations that might be surprising
1021 to end users and to get -fno-toplevel-reorder tested. */
1022 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1024 flag_toplevel_reorder = 0;
1025 flag_section_anchors = 0;
1027 if (!flag_toplevel_reorder)
1029 if (flag_section_anchors == 1)
1030 error ("section anchors must be disabled when toplevel reorder"
1032 flag_section_anchors = 0;
1038 flag_pic = flag_pie;
1039 if (flag_pic && !flag_pie)
1041 first_time_p = false;
1046 /* Inlining does not work if not optimizing,
1047 so force it not to be done. */
1052 /* The optimization to partition hot and cold basic blocks into separate
1053 sections of the .o and executable files does not work (currently)
1054 with exception handling. This is because there is no support for
1055 generating unwind info. If flag_exceptions is turned on we need to
1056 turn off the partitioning optimization. */
1058 if (flag_exceptions && flag_reorder_blocks_and_partition
1059 && (USING_SJLJ_EXCEPTIONS
1060 #ifdef TARGET_UNWIND_INFO
1065 inform (input_location,
1066 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1067 flag_reorder_blocks_and_partition = 0;
1068 flag_reorder_blocks = 1;
1071 /* If user requested unwind info, then turn off the partitioning
1074 if (flag_unwind_tables && ! targetm.unwind_tables_default
1075 && flag_reorder_blocks_and_partition
1076 && (USING_SJLJ_EXCEPTIONS
1077 #ifdef TARGET_UNWIND_INFO
1082 inform (input_location,
1083 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1084 flag_reorder_blocks_and_partition = 0;
1085 flag_reorder_blocks = 1;
1088 /* If the target requested unwind info, then turn off the partitioning
1089 optimization with a different message. Likewise, if the target does not
1090 support named sections. */
1092 if (flag_reorder_blocks_and_partition
1093 && (!targetm.have_named_sections
1094 || (flag_unwind_tables && targetm.unwind_tables_default
1095 && (USING_SJLJ_EXCEPTIONS
1096 #ifdef TARGET_UNWIND_INFO
1101 inform (input_location,
1102 "-freorder-blocks-and-partition does not work on this architecture");
1103 flag_reorder_blocks_and_partition = 0;
1104 flag_reorder_blocks = 1;
1107 /* Pipelining of outer loops is only possible when general pipelining
1108 capabilities are requested. */
1109 if (!flag_sel_sched_pipelining)
1110 flag_sel_sched_pipelining_outer_loops = 0;
1112 if (!targetm.ira_cover_classes
1113 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1115 inform (input_location,
1116 "-fira-algorithm=CB does not work on this architecture");
1117 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1120 if (flag_conserve_stack)
1122 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1123 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1124 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1125 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1127 if (flag_wpa || flag_ltrans)
1129 /* These passes are not WHOPR compatible yet. */
1131 flag_ipa_reference = 0;
1132 flag_ipa_type_escape = 0;
1134 flag_ipa_struct_reorg = 0;
1137 if (flag_lto || flag_whopr)
1140 flag_generate_lto = 1;
1142 /* When generating IL, do not operate in whole-program mode.
1143 Otherwise, symbols will be privatized too early, causing link
1145 flag_whole_program = 0;
1147 error ("LTO support has not been enabled in this configuration");
1151 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1152 check option consistency. */
1153 if (flag_lto && flag_whopr)
1154 error ("-flto and -fwhopr are mutually exclusive");
1157 #define LEFT_COLUMN 27
1159 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1160 followed by word-wrapped HELP in a second column. */
1162 wrap_help (const char *help,
1164 unsigned int item_width,
1165 unsigned int columns)
1167 unsigned int col_width = LEFT_COLUMN;
1168 unsigned int remaining, room, len;
1170 remaining = strlen (help);
1174 room = columns - 3 - MAX (col_width, item_width);
1183 for (i = 0; help[i]; i++)
1185 if (i >= room && len != remaining)
1189 else if ((help[i] == '-' || help[i] == '/')
1190 && help[i + 1] != ' '
1191 && i > 0 && ISALPHA (help[i - 1]))
1196 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1198 while (help[len] == ' ')
1206 /* Print help for a specific front-end, etc. */
1208 print_filtered_help (unsigned int include_flags,
1209 unsigned int exclude_flags,
1210 unsigned int any_flags,
1211 unsigned int columns)
1215 static char *printed = NULL;
1217 bool displayed = false;
1219 if (include_flags == CL_PARAMS)
1221 for (i = 0; i < LAST_PARAM; i++)
1223 const char *param = compiler_params[i].option;
1225 help = compiler_params[i].help;
1226 if (help == NULL || *help == '\0')
1228 if (exclude_flags & CL_UNDOCUMENTED)
1230 help = undocumented_msg;
1233 /* Get the translation. */
1236 wrap_help (help, param, strlen (param), columns);
1243 printed = XCNEWVAR (char, cl_options_count);
1245 for (i = 0; i < cl_options_count; i++)
1247 static char new_help[128];
1248 const struct cl_option *option = cl_options + i;
1253 if (include_flags == 0
1254 || ((option->flags & include_flags) != include_flags))
1256 if ((option->flags & any_flags) == 0)
1260 /* Skip unwanted switches. */
1261 if ((option->flags & exclude_flags) != 0)
1265 /* Skip switches that have already been printed. */
1271 help = option->help;
1274 if (exclude_flags & CL_UNDOCUMENTED)
1276 help = undocumented_msg;
1279 /* Get the translation. */
1282 /* Find the gap between the name of the
1283 option and its descriptive text. */
1284 tab = strchr (help, '\t');
1293 opt = option->opt_text;
1297 /* With the -Q option enabled we change the descriptive text associated
1298 with an option to be an indication of its current setting. */
1301 if (len < (LEFT_COLUMN + 2))
1302 strcpy (new_help, "\t\t");
1304 strcpy (new_help, "\t");
1306 if (option->flag_var != NULL)
1308 if (option->flags & CL_JOINED)
1310 if (option->var_type == CLVC_STRING)
1312 if (* (const char **) option->flag_var != NULL)
1313 snprintf (new_help + strlen (new_help),
1314 sizeof (new_help) - strlen (new_help),
1315 * (const char **) option->flag_var);
1318 sprintf (new_help + strlen (new_help),
1319 "%#x", * (int *) option->flag_var);
1322 strcat (new_help, option_enabled (i)
1323 ? _("[enabled]") : _("[disabled]"));
1329 wrap_help (help, opt, len, columns);
1335 unsigned int langs = include_flags & CL_LANG_ALL;
1338 printf (_(" No options with the desired characteristics were found\n"));
1343 /* PR 31349: Tell the user how to see all of the
1344 options supported by a specific front end. */
1345 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1346 if ((1U << i) & langs)
1347 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1348 lang_names[i], lang_names[i]);
1352 else if (! displayed)
1353 printf (_(" All options with the desired characteristics have already been displayed\n"));
1358 /* Display help for a specified type of option.
1359 The options must have ALL of the INCLUDE_FLAGS set
1360 ANY of the flags in the ANY_FLAGS set
1361 and NONE of the EXCLUDE_FLAGS set. */
1363 print_specific_help (unsigned int include_flags,
1364 unsigned int exclude_flags,
1365 unsigned int any_flags)
1367 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1368 const char * description = NULL;
1369 const char * descrip_extra = "";
1372 static unsigned int columns = 0;
1374 /* Sanity check: Make sure that we do not have more
1375 languages than we have bits available to enumerate them. */
1376 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1378 /* If we have not done so already, obtain
1379 the desired maximum width of the output. */
1384 GET_ENVIRONMENT (p, "COLUMNS");
1387 int value = atoi (p);
1394 /* Use a reasonable default. */
1398 /* Decide upon the title for the options that we are going to display. */
1399 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1401 switch (flag & include_flags)
1407 description = _("The following options are target specific");
1410 description = _("The following options control compiler warning messages");
1412 case CL_OPTIMIZATION:
1413 description = _("The following options control optimizations");
1416 description = _("The following options are language-independent");
1419 description = _("The --param option recognizes the following as parameters");
1422 if (i >= cl_lang_count)
1424 if (exclude_flags & all_langs_mask)
1425 description = _("The following options are specific to just the language ");
1427 description = _("The following options are supported by the language ");
1428 descrip_extra = lang_names [i];
1433 if (description == NULL)
1437 if (include_flags & CL_UNDOCUMENTED)
1438 description = _("The following options are not documented");
1439 else if (include_flags & CL_SEPARATE)
1440 description = _("The following options take separate arguments");
1441 else if (include_flags & CL_JOINED)
1442 description = _("The following options take joined arguments");
1445 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1452 if (any_flags & all_langs_mask)
1453 description = _("The following options are language-related");
1455 description = _("The following options are language-independent");
1459 printf ("%s%s:\n", description, descrip_extra);
1460 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1463 /* Handle target- and language-independent options. Return zero to
1464 generate an "unknown option" message. Only options that need
1465 extra handling need to be listed here; if you simply want
1466 VALUE assigned to a variable, it happens automatically. */
1469 common_handle_option (size_t scode, const char *arg, int value,
1470 unsigned int lang_mask)
1472 static bool verbose = false;
1473 enum opt_code code = (enum opt_code) scode;
1488 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1489 unsigned int undoc_mask;
1492 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1493 /* First display any single language specific options. */
1494 for (i = 0; i < cl_lang_count; i++)
1496 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1497 /* Next display any multi language specific options. */
1498 print_specific_help (0, undoc_mask, all_langs_mask);
1499 /* Then display any remaining, non-language options. */
1500 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1501 print_specific_help (i, undoc_mask, 0);
1502 exit_after_options = true;
1506 case OPT_ftarget_help:
1507 case OPT__target_help:
1508 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1509 exit_after_options = true;
1511 /* Allow the target a chance to give the user some additional information. */
1512 if (targetm.target_help)
1513 targetm.target_help ();
1519 const char * a = arg;
1520 unsigned int include_flags = 0;
1521 /* Note - by default we include undocumented options when listing
1522 specific classes. If you only want to see documented options
1523 then add ",^undocumented" to the --help= option. E.g.:
1525 --help=target,^undocumented */
1526 unsigned int exclude_flags = 0;
1528 /* Walk along the argument string, parsing each word in turn.
1530 arg = [^]{word}[,{arg}]
1531 word = {optimizers|target|warnings|undocumented|
1532 params|common|<language>} */
1537 const char * string;
1542 { "optimizers", CL_OPTIMIZATION },
1543 { "target", CL_TARGET },
1544 { "warnings", CL_WARNING },
1545 { "undocumented", CL_UNDOCUMENTED },
1546 { "params", CL_PARAMS },
1547 { "joined", CL_JOINED },
1548 { "separate", CL_SEPARATE },
1549 { "common", CL_COMMON },
1552 unsigned int * pflags;
1554 unsigned int lang_flag, specific_flag;
1561 pflags = & exclude_flags;
1564 pflags = & include_flags;
1566 comma = strchr (a, ',');
1577 /* Check to see if the string matches an option class name. */
1578 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1579 if (strncasecmp (a, specifics[i].string, len) == 0)
1581 specific_flag = specifics[i].flag;
1585 /* Check to see if the string matches a language name.
1586 Note - we rely upon the alpha-sorted nature of the entries in
1587 the lang_names array, specifically that shorter names appear
1588 before their longer variants. (i.e. C before C++). That way
1589 when we are attempting to match --help=c for example we will
1590 match with C first and not C++. */
1591 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1592 if (strncasecmp (a, lang_names[i], len) == 0)
1594 lang_flag = 1U << i;
1598 if (specific_flag != 0)
1601 * pflags |= specific_flag;
1604 /* The option's argument matches both the start of a
1605 language name and the start of an option class name.
1606 We have a special case for when the user has
1607 specified "--help=c", but otherwise we have to issue
1609 if (strncasecmp (a, "c", len) == 0)
1610 * pflags |= lang_flag;
1613 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1617 else if (lang_flag != 0)
1618 * pflags |= lang_flag;
1621 "warning: unrecognized argument to --help= option: %.*s\n",
1630 print_specific_help (include_flags, exclude_flags, 0);
1631 exit_after_options = true;
1637 exit_after_options = true;
1641 g_switch_value = value;
1642 g_switch_set = true;
1647 /* Currently handled in a prescan. */
1651 enable_warning_as_error (arg, value, lang_mask);
1654 case OPT_Wlarger_than_:
1655 /* This form corresponds to -Wlarger-than-.
1656 Kept for backward compatibility.
1657 Don't use it as the first argument of warning(). */
1659 case OPT_Wlarger_than_eq:
1660 larger_than_size = value;
1661 warn_larger_than = value != -1;
1664 case OPT_Wframe_larger_than_:
1665 frame_larger_than_size = value;
1666 warn_frame_larger_than = value != -1;
1669 case OPT_Wstrict_aliasing:
1670 set_Wstrict_aliasing (value);
1673 case OPT_Wstrict_aliasing_:
1674 warn_strict_aliasing = value;
1677 case OPT_Wstrict_overflow:
1678 warn_strict_overflow = (value
1679 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1683 case OPT_Wstrict_overflow_:
1684 warn_strict_overflow = value;
1688 warn_unused = value;
1693 aux_info_file_name = arg;
1694 flag_gen_aux_info = 1;
1698 aux_base_name = arg;
1701 case OPT_auxbase_strip:
1703 char *tmp = xstrdup (arg);
1704 strip_off_ending (tmp, strlen (tmp));
1706 aux_base_name = tmp;
1711 decode_d_option (arg);
1715 dump_base_name = arg;
1719 dump_dir_name = arg;
1722 case OPT_falign_functions_:
1723 align_functions = value;
1726 case OPT_falign_jumps_:
1727 align_jumps = value;
1730 case OPT_falign_labels_:
1731 align_labels = value;
1734 case OPT_falign_loops_:
1735 align_loops = value;
1738 case OPT_fbranch_probabilities:
1739 flag_branch_probabilities_set = true;
1742 case OPT_fcall_used_:
1743 fix_register (arg, 0, 1);
1746 case OPT_fcall_saved_:
1747 fix_register (arg, 0, 0);
1751 dbg_cnt_process_opt (arg);
1754 case OPT_fdbg_cnt_list:
1755 dbg_cnt_list_all_counters ();
1758 case OPT_fdebug_prefix_map_:
1759 add_debug_prefix_map (arg);
1762 case OPT_fdiagnostics_show_location_:
1763 if (!strcmp (arg, "once"))
1764 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1765 else if (!strcmp (arg, "every-line"))
1766 diagnostic_prefixing_rule (global_dc)
1767 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1772 case OPT_fdiagnostics_show_option:
1773 global_dc->show_option_requested = value;
1777 if (!dump_switch_p (arg))
1781 case OPT_fexcess_precision_:
1782 if (!strcmp (arg, "fast"))
1783 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1784 else if (!strcmp (arg, "standard"))
1785 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1787 error ("unknown excess precision style \"%s\"", arg);
1790 case OPT_ffast_math:
1791 set_fast_math_flags (value);
1794 case OPT_funsafe_math_optimizations:
1795 set_unsafe_math_optimizations_flags (value);
1799 fix_register (arg, 1, 1);
1802 case OPT_finline_limit_:
1803 case OPT_finline_limit_eq:
1804 set_param_value ("max-inline-insns-single", value / 2);
1805 set_param_value ("max-inline-insns-auto", value / 2);
1808 case OPT_finstrument_functions_exclude_function_list_:
1809 add_comma_separated_to_vector
1810 (&flag_instrument_functions_exclude_functions, arg);
1813 case OPT_finstrument_functions_exclude_file_list_:
1814 add_comma_separated_to_vector
1815 (&flag_instrument_functions_exclude_files, arg);
1818 case OPT_fmessage_length_:
1819 pp_set_line_maximum_length (global_dc->printer, value);
1822 case OPT_fpack_struct_:
1823 if (value <= 0 || (value & (value - 1)) || value > 16)
1824 error ("structure alignment must be a small power of two, not %d", value);
1827 initial_max_fld_align = value;
1828 maximum_field_alignment = value * BITS_PER_UNIT;
1832 case OPT_fpeel_loops:
1833 flag_peel_loops_set = true;
1837 #ifdef ENABLE_PLUGIN
1838 add_new_plugin (arg);
1840 error ("Plugin support is disabled. Configure with --enable-plugin.");
1844 case OPT_fplugin_arg_:
1845 #ifdef ENABLE_PLUGIN
1846 parse_plugin_arg_opt (arg);
1848 error ("Plugin support is disabled. Configure with --enable-plugin.");
1852 case OPT_fprofile_arcs:
1853 profile_arc_flag_set = true;
1856 case OPT_finline_functions:
1857 flag_inline_functions_set = true;
1860 case OPT_fprofile_dir_:
1861 profile_data_prefix = xstrdup (arg);
1864 case OPT_fprofile_use_:
1865 profile_data_prefix = xstrdup (arg);
1866 flag_profile_use = true;
1868 /* No break here - do -fprofile-use processing. */
1869 case OPT_fprofile_use:
1870 if (!flag_branch_probabilities_set)
1871 flag_branch_probabilities = value;
1872 if (!flag_profile_values_set)
1873 flag_profile_values = value;
1874 if (!flag_unroll_loops_set)
1875 flag_unroll_loops = value;
1876 if (!flag_peel_loops_set)
1877 flag_peel_loops = value;
1878 if (!flag_tracer_set)
1879 flag_tracer = value;
1880 if (!flag_value_profile_transformations_set)
1881 flag_value_profile_transformations = value;
1882 if (!flag_inline_functions_set)
1883 flag_inline_functions = value;
1884 if (!flag_ipa_cp_set)
1885 flag_ipa_cp = value;
1886 if (!flag_ipa_cp_clone_set
1887 && value && flag_ipa_cp)
1888 flag_ipa_cp_clone = value;
1889 if (!flag_predictive_commoning_set)
1890 flag_predictive_commoning = value;
1891 if (!flag_unswitch_loops_set)
1892 flag_unswitch_loops = value;
1893 if (!flag_gcse_after_reload_set)
1894 flag_gcse_after_reload = value;
1897 case OPT_fprofile_generate_:
1898 profile_data_prefix = xstrdup (arg);
1900 /* No break here - do -fprofile-generate processing. */
1901 case OPT_fprofile_generate:
1902 if (!profile_arc_flag_set)
1903 profile_arc_flag = value;
1904 if (!flag_profile_values_set)
1905 flag_profile_values = value;
1906 if (!flag_value_profile_transformations_set)
1907 flag_value_profile_transformations = value;
1908 if (!flag_inline_functions_set)
1909 flag_inline_functions = value;
1912 case OPT_fprofile_values:
1913 flag_profile_values_set = true;
1916 case OPT_fvisibility_:
1918 if (!strcmp(arg, "default"))
1919 default_visibility = VISIBILITY_DEFAULT;
1920 else if (!strcmp(arg, "internal"))
1921 default_visibility = VISIBILITY_INTERNAL;
1922 else if (!strcmp(arg, "hidden"))
1923 default_visibility = VISIBILITY_HIDDEN;
1924 else if (!strcmp(arg, "protected"))
1925 default_visibility = VISIBILITY_PROTECTED;
1927 error ("unrecognized visibility value \"%s\"", arg);
1932 flag_value_profile_transformations_set = true;
1935 case OPT_frandom_seed:
1936 /* The real switch is -fno-random-seed. */
1939 set_random_seed (NULL);
1942 case OPT_frandom_seed_:
1943 set_random_seed (arg);
1946 case OPT_fselective_scheduling:
1947 case OPT_fselective_scheduling2:
1948 sel_sched_switch_set = true;
1951 case OPT_fsched_verbose_:
1952 #ifdef INSN_SCHEDULING
1953 fix_sched_param ("verbose", arg);
1959 case OPT_fsched_stalled_insns_:
1960 flag_sched_stalled_insns = value;
1961 if (flag_sched_stalled_insns == 0)
1962 flag_sched_stalled_insns = -1;
1965 case OPT_fsched_stalled_insns_dep_:
1966 flag_sched_stalled_insns_dep = value;
1969 case OPT_fstack_check_:
1970 if (!strcmp (arg, "no"))
1971 flag_stack_check = NO_STACK_CHECK;
1972 else if (!strcmp (arg, "generic"))
1973 /* This is the old stack checking method. */
1974 flag_stack_check = STACK_CHECK_BUILTIN
1975 ? FULL_BUILTIN_STACK_CHECK
1976 : GENERIC_STACK_CHECK;
1977 else if (!strcmp (arg, "specific"))
1978 /* This is the new stack checking method. */
1979 flag_stack_check = STACK_CHECK_BUILTIN
1980 ? FULL_BUILTIN_STACK_CHECK
1981 : STACK_CHECK_STATIC_BUILTIN
1982 ? STATIC_BUILTIN_STACK_CHECK
1983 : GENERIC_STACK_CHECK;
1985 warning (0, "unknown stack check parameter \"%s\"", arg);
1988 case OPT_fstack_check:
1989 /* This is the same as the "specific" mode above. */
1991 flag_stack_check = STACK_CHECK_BUILTIN
1992 ? FULL_BUILTIN_STACK_CHECK
1993 : STACK_CHECK_STATIC_BUILTIN
1994 ? STATIC_BUILTIN_STACK_CHECK
1995 : GENERIC_STACK_CHECK;
1997 flag_stack_check = NO_STACK_CHECK;
2000 case OPT_fstack_limit:
2001 /* The real switch is -fno-stack-limit. */
2004 stack_limit_rtx = NULL_RTX;
2007 case OPT_fstack_limit_register_:
2009 int reg = decode_reg_name (arg);
2011 error ("unrecognized register name \"%s\"", arg);
2013 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2017 case OPT_fstack_limit_symbol_:
2018 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2021 case OPT_ftree_vectorizer_verbose_:
2022 vect_set_verbosity_level (arg);
2025 case OPT_ftls_model_:
2026 if (!strcmp (arg, "global-dynamic"))
2027 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2028 else if (!strcmp (arg, "local-dynamic"))
2029 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2030 else if (!strcmp (arg, "initial-exec"))
2031 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2032 else if (!strcmp (arg, "local-exec"))
2033 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2035 warning (0, "unknown tls-model \"%s\"", arg);
2038 case OPT_fira_algorithm_:
2039 if (!strcmp (arg, "CB"))
2040 flag_ira_algorithm = IRA_ALGORITHM_CB;
2041 else if (!strcmp (arg, "priority"))
2042 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2044 warning (0, "unknown ira algorithm \"%s\"", arg);
2047 case OPT_fira_region_:
2048 if (!strcmp (arg, "one"))
2049 flag_ira_region = IRA_REGION_ONE;
2050 else if (!strcmp (arg, "all"))
2051 flag_ira_region = IRA_REGION_ALL;
2052 else if (!strcmp (arg, "mixed"))
2053 flag_ira_region = IRA_REGION_MIXED;
2055 warning (0, "unknown ira region \"%s\"", arg);
2058 case OPT_fira_verbose_:
2059 flag_ira_verbose = value;
2063 flag_tracer_set = true;
2067 flag_ipa_cp_set = true;
2070 case OPT_fipa_cp_clone:
2071 flag_ipa_cp_clone_set = true;
2074 case OPT_fpredictive_commoning:
2075 flag_predictive_commoning_set = true;
2078 case OPT_funswitch_loops:
2079 flag_unswitch_loops_set = true;
2082 case OPT_fgcse_after_reload:
2083 flag_gcse_after_reload_set = true;
2086 case OPT_funroll_loops:
2087 flag_unroll_loops_set = true;
2091 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2095 set_debug_level (SDB_DEBUG, false, arg);
2099 if (value < 2 || value > 4)
2100 error ("dwarf version %d is not supported", value);
2102 dwarf_version = value;
2103 set_debug_level (DWARF2_DEBUG, false, "");
2107 set_debug_level (NO_DEBUG, 2, arg);
2112 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2116 set_debug_level (VMS_DEBUG, false, arg);
2121 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2125 asm_file_name = arg;
2128 case OPT_pedantic_errors:
2129 flag_pedantic_errors = pedantic = 1;
2133 case OPT_fcse_skip_blocks:
2134 case OPT_floop_optimize:
2135 case OPT_frerun_loop_opt:
2136 case OPT_fsched2_use_traces:
2137 case OPT_fstrength_reduce:
2138 case OPT_ftree_store_copy_prop:
2139 case OPT_fforce_addr:
2140 case OPT_ftree_salias:
2141 case OPT_ftree_store_ccp:
2142 case OPT_Wunreachable_code:
2143 case OPT_fargument_alias:
2144 case OPT_fargument_noalias:
2145 case OPT_fargument_noalias_anything:
2146 case OPT_fargument_noalias_global:
2147 /* These are no-ops, preserved for backward compatibility. */
2150 case OPT_fuse_linker_plugin:
2151 /* No-op. Used by the driver and passed to us because it starts with f.*/
2155 /* If the flag was handled in a standard way, assume the lack of
2156 processing here is intentional. */
2157 gcc_assert (cl_options[scode].flag_var);
2164 /* Handle --param NAME=VALUE. */
2166 handle_param (const char *carg)
2171 arg = xstrdup (carg);
2172 equal = strchr (arg, '=');
2174 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2177 value = integral_argument (equal + 1);
2179 error ("invalid --param value %qs", equal + 1);
2183 set_param_value (arg, value);
2190 /* Used to set the level of strict aliasing warnings,
2191 when no level is specified (i.e., when -Wstrict-aliasing, and not
2192 -Wstrict-aliasing=level was given).
2193 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2194 and 0 otherwise. After calling this function, wstrict_aliasing will be
2195 set to the default value of -Wstrict_aliasing=level, currently 3. */
2197 set_Wstrict_aliasing (int onoff)
2199 gcc_assert (onoff == 0 || onoff == 1);
2201 warn_strict_aliasing = 3;
2203 warn_strict_aliasing = 0;
2206 /* The following routines are useful in setting all the flags that
2207 -ffast-math and -fno-fast-math imply. */
2209 set_fast_math_flags (int set)
2211 flag_unsafe_math_optimizations = set;
2212 set_unsafe_math_optimizations_flags (set);
2213 flag_finite_math_only = set;
2214 flag_errno_math = !set;
2217 flag_signaling_nans = 0;
2218 flag_rounding_math = 0;
2219 flag_cx_limited_range = 1;
2223 /* When -funsafe-math-optimizations is set the following
2224 flags are set as well. */
2226 set_unsafe_math_optimizations_flags (int set)
2228 flag_trapping_math = !set;
2229 flag_signed_zeros = !set;
2230 flag_associative_math = set;
2231 flag_reciprocal_math = set;
2234 /* Return true iff flags are set as if -ffast-math. */
2236 fast_math_flags_set_p (void)
2238 return (!flag_trapping_math
2239 && flag_unsafe_math_optimizations
2240 && flag_finite_math_only
2241 && !flag_signed_zeros
2242 && !flag_errno_math);
2245 /* Return true iff flags are set as if -ffast-math but using the flags stored
2246 in the struct cl_optimization structure. */
2248 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2250 return (!opt->flag_trapping_math
2251 && opt->flag_unsafe_math_optimizations
2252 && opt->flag_finite_math_only
2253 && !opt->flag_signed_zeros
2254 && !opt->flag_errno_math);
2257 /* Handle a debug output -g switch. EXTENDED is true or false to support
2258 extended output (2 is special and means "-ggdb" was given). */
2260 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2262 static bool type_explicit;
2264 use_gnu_debug_info_extensions = extended;
2266 if (type == NO_DEBUG)
2268 if (write_symbols == NO_DEBUG)
2270 write_symbols = PREFERRED_DEBUGGING_TYPE;
2274 #ifdef DWARF2_DEBUGGING_INFO
2275 write_symbols = DWARF2_DEBUG;
2276 #elif defined DBX_DEBUGGING_INFO
2277 write_symbols = DBX_DEBUG;
2281 if (write_symbols == NO_DEBUG)
2282 warning (0, "target system does not support debug output");
2287 /* Does it conflict with an already selected type? */
2288 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2289 error ("debug format \"%s\" conflicts with prior selection",
2290 debug_type_names[type]);
2291 write_symbols = type;
2292 type_explicit = true;
2295 /* A debug flag without a level defaults to level 2. */
2298 if (!debug_info_level)
2299 debug_info_level = DINFO_LEVEL_NORMAL;
2303 int argval = integral_argument (arg);
2305 error ("unrecognised debug output level \"%s\"", arg);
2306 else if (argval > 3)
2307 error ("debug output level %s is too high", arg);
2309 debug_info_level = (enum debug_info_level) argval;
2313 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2314 a simple on-off switch. */
2317 option_enabled (int opt_idx)
2319 const struct cl_option *option = &(cl_options[opt_idx]);
2321 if (option->flag_var)
2322 switch (option->var_type)
2325 return *(int *) option->flag_var != 0;
2328 return *(int *) option->flag_var == option->var_value;
2330 case CLVC_BIT_CLEAR:
2331 return (*(int *) option->flag_var & option->var_value) == 0;
2334 return (*(int *) option->flag_var & option->var_value) != 0;
2342 /* Fill STATE with the current state of option OPTION. Return true if
2343 there is some state to store. */
2346 get_option_state (int option, struct cl_option_state *state)
2348 if (cl_options[option].flag_var == 0)
2351 switch (cl_options[option].var_type)
2355 state->data = cl_options[option].flag_var;
2356 state->size = sizeof (int);
2359 case CLVC_BIT_CLEAR:
2361 state->ch = option_enabled (option);
2362 state->data = &state->ch;
2367 state->data = *(const char **) cl_options[option].flag_var;
2368 if (state->data == 0)
2370 state->size = strlen ((const char *) state->data) + 1;
2376 /* Set *OPTION according to VALUE and ARG. */
2379 set_option (const struct cl_option *option, int value, const char *arg)
2381 if (!option->flag_var)
2384 switch (option->var_type)
2387 *(int *) option->flag_var = value;
2391 *(int *) option->flag_var = (value
2393 : !option->var_value);
2396 case CLVC_BIT_CLEAR:
2398 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2399 *(int *) option->flag_var |= option->var_value;
2401 *(int *) option->flag_var &= ~option->var_value;
2402 if (option->flag_var == &target_flags)
2403 target_flags_explicit |= option->var_value;
2407 *(const char **) option->flag_var = arg;
2413 /* Callback function, called when -Werror= enables a warning. */
2415 static void (*warning_as_error_callback) (int) = NULL;
2417 /* Register a callback for enable_warning_as_error calls. */
2420 register_warning_as_error_callback (void (*callback) (int))
2422 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2423 warning_as_error_callback = callback;
2426 /* Enable a warning option as an error. This is used by -Werror= and
2427 also by legacy Werror-implicit-function-declaration. */
2430 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2435 new_option = XNEWVEC (char, strlen (arg) + 2);
2436 new_option[0] = 'W';
2437 strcpy (new_option + 1, arg);
2438 option_index = find_opt (new_option, lang_mask);
2439 if (option_index == N_OPTS)
2441 error ("-Werror=%s: No option -%s", arg, new_option);
2445 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2447 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2448 if (kind == DK_ERROR)
2450 const struct cl_option * const option = cl_options + option_index;
2452 /* -Werror=foo implies -Wfoo. */
2453 if (option->var_type == CLVC_BOOLEAN && option->flag_var)
2454 *(int *) option->flag_var = 1;
2456 if (warning_as_error_callback)
2457 warning_as_error_callback (option_index);