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, int kind);
376 static void handle_param (const char *);
377 static char *write_langs (unsigned int lang_mask);
378 static void complain_wrong_lang (const char *, const struct cl_option *,
379 unsigned int lang_mask);
380 static void set_debug_level (enum debug_info_type type, int extended,
383 /* If ARG is a non-negative integer made up solely of digits, return its
384 value, otherwise return -1. */
386 integral_argument (const char *arg)
390 while (*p && ISDIGIT (*p))
399 /* Return a malloced slash-separated list of languages in MASK. */
401 write_langs (unsigned int mask)
403 unsigned int n = 0, len = 0;
404 const char *lang_name;
407 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
408 if (mask & (1U << n))
409 len += strlen (lang_name) + 1;
411 result = XNEWVEC (char, len);
413 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
414 if (mask & (1U << n))
418 strcpy (result + len, lang_name);
419 len += strlen (lang_name);
427 /* Complain that switch OPT_INDEX does not apply to this front end. */
429 complain_wrong_lang (const char *text, const struct cl_option *option,
430 unsigned int lang_mask)
432 char *ok_langs, *bad_lang;
434 /* The LTO front end inherits all the options from the first front
435 end that was used. However, not all the original front end
436 options make sense in LTO.
438 A real solution would be to filter this in collect2, but collect2
439 does not have access to all the option attributes to know what to
440 filter. So, in lto1 we silently accept inherited flags and do
442 if (lang_mask & CL_LTO)
445 ok_langs = write_langs (option->flags);
446 bad_lang = write_langs (lang_mask);
448 /* Eventually this should become a hard error IMO. */
449 warning (0, "command line option \"%s\" is valid for %s but not for %s",
450 text, ok_langs, bad_lang);
456 /* Buffer the unknown option described by the string OPT. Currently,
457 we only complain about unknown -Wno-* options if they may have
458 prevented a diagnostic. Otherwise, we just ignore them.
459 Note that if we do complain, it is only as a warning, not an error;
460 passing the compiler an unrecognised -Wno-* option should never
461 change whether the compilation succeeds or fails. */
463 static void postpone_unknown_option_warning(const char *opt)
465 VEC_safe_push (const_char_p, heap, ignored_options, opt);
468 /* Produce a warning for each option previously buffered. */
470 void print_ignored_options (void)
472 location_t saved_loc = input_location;
476 while (!VEC_empty (const_char_p, ignored_options))
479 opt = VEC_pop (const_char_p, ignored_options);
480 warning (0, "unrecognized command line option \"%s\"", opt);
483 input_location = saved_loc;
487 /* Handle option OPT_INDEX, and argument ARG, for the language
488 indicated by LANG_MASK. VALUE is true, unless no- form of an -f or
489 -W option was given. KIND is the diagnostic_t if this is a
490 diagnostics option, DK_UNSPECIFIED otherwise. Returns false if the
491 switch was invalid. */
493 handle_option (int opt_index, int value, const char *arg,
494 unsigned int lang_mask, int kind)
496 const struct cl_option *option = &cl_options[opt_index];
498 if (option->flag_var)
499 set_option (opt_index, value, arg, kind);
501 if (option->flags & lang_mask)
503 if (lang_hooks.handle_option (opt_index, arg, value, kind) == 0)
506 lto_register_user_option (opt_index, arg, value, lang_mask);
509 if (option->flags & CL_COMMON)
511 if (common_handle_option (opt_index, arg, value, lang_mask, kind) == 0)
514 lto_register_user_option (opt_index, arg, value, CL_COMMON);
517 if (option->flags & CL_TARGET)
519 if (!targetm.handle_option (opt_index, arg, value))
522 lto_register_user_option (opt_index, arg, value, CL_TARGET);
527 /* Handle the switch beginning at ARGV for the language indicated by
528 LANG_MASK. Returns the number of switches consumed. */
530 read_cmdline_option (const char **argv, unsigned int lang_mask)
533 const char *opt, *arg = 0;
536 unsigned int result = 0;
537 const struct cl_option *option;
541 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
542 if (opt_index == cl_options_count
543 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
544 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
546 /* Drop the "no-" from negative switches. */
547 size_t len = strlen (opt) - 3;
549 dup = XNEWVEC (char, len + 1);
552 memcpy (dup + 2, opt + 5, len - 2 + 1);
555 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
556 if (opt_index == cl_options_count && opt[1] == 'W')
558 /* We don't generate warnings for unknown -Wno-* options
559 unless we issue diagnostics. */
560 postpone_unknown_option_warning (argv[0]);
566 if (opt_index == cl_options_count)
569 option = &cl_options[opt_index];
571 /* Reject negative form of switches that don't take negatives as
573 if (!value && (option->flags & CL_REJECT_NEGATIVE))
576 /* We've recognized this switch. */
579 /* Check to see if the option is disabled for this configuration. */
580 if (option->flags & CL_DISABLED)
582 error ("command line option %qs"
583 " is not supported by this configuration", opt);
587 /* Sort out any argument the switch takes. */
588 if (option->flags & CL_JOINED)
590 /* Have arg point to the original switch. This is because
591 some code, such as disable_builtin_function, expects its
592 argument to be persistent until the program exits. */
593 arg = argv[0] + cl_options[opt_index].opt_len + 1;
595 arg += strlen ("no-");
597 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
599 if (option->flags & CL_SEPARATE)
605 /* Missing argument. */
609 else if (option->flags & CL_SEPARATE)
615 /* Now we've swallowed any potential argument, complain if this
616 is a switch for a different front end. */
617 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
619 complain_wrong_lang (argv[0], option, lang_mask);
622 else if ((option->flags & CL_TARGET)
623 && (option->flags & CL_LANG_ALL)
624 && !(option->flags & lang_mask))
626 /* Complain for target flag language mismatches if any languages
628 complain_wrong_lang (argv[0], option, lang_mask);
632 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
634 if (!lang_hooks.missing_argument (opt, opt_index))
635 error ("missing argument to \"%s\"", opt);
639 /* If the switch takes an integer, convert it. */
640 if (arg && (option->flags & CL_UINTEGER))
642 value = integral_argument (arg);
645 error ("argument to \"%s\" should be a non-negative integer",
651 if (!handle_option (opt_index, value, arg, lang_mask, DK_UNSPECIFIED))
660 /* Handle FILENAME from the command line. */
662 add_input_filename (const char *filename)
665 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
666 in_fnames[num_in_fnames - 1] = filename;
669 /* Add comma-separated strings to a char_p vector. */
672 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
679 /* We never free this string. */
692 VEC_safe_push (char_p, heap, *pvec, token_start);
695 if (*r == '\\' && r[1] == ',')
703 if (*token_start != '\0')
704 VEC_safe_push (char_p, heap, *pvec, token_start);
707 /* Return whether we should exclude FNDECL from instrumentation. */
710 flag_instrument_functions_exclude_p (tree fndecl)
712 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
718 name = lang_hooks.decl_printable_name (fndecl, 0);
720 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
724 if (strstr (name, s) != NULL)
729 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
735 name = DECL_SOURCE_FILE (fndecl);
737 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
740 if (strstr (name, s) != NULL)
749 /* Decode and handle the vector of command line options. LANG_MASK
750 contains has a single bit set representing the current
753 read_cmdline_options (unsigned int argc, const char **argv, unsigned int lang_mask)
757 for (i = 1; i < argc; i += n)
759 const char *opt = argv[i];
761 /* Interpret "-" or a non-switch as a file name. */
762 if (opt[0] != '-' || opt[1] == '\0')
764 if (main_input_filename == NULL)
766 main_input_filename = opt;
767 main_input_baselength
768 = base_of_path (main_input_filename, &main_input_basename);
770 add_input_filename (opt);
775 n = read_cmdline_option (argv + i, lang_mask);
780 error ("unrecognized command line option \"%s\"", opt);
785 /* Parse command line options and set default flag values. Do minimal
786 options processing. */
788 decode_options (unsigned int argc, const char **argv)
790 static bool first_time_p = true;
791 static int initial_min_crossjump_insns;
792 static int initial_max_fields_for_field_sensitive;
793 static int initial_loop_invariant_max_bbs_in_loop;
794 static unsigned int initial_lang_mask;
796 unsigned int i, lang_mask;
804 /* Perform language-specific options initialization. */
805 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
807 lang_hooks.initialize_diagnostics (global_dc);
809 /* Save initial values of parameters we reset. */
810 initial_min_crossjump_insns
811 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
812 initial_max_fields_for_field_sensitive
813 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
814 initial_loop_invariant_max_bbs_in_loop
815 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
818 lang_mask = initial_lang_mask;
820 /* Scan to see what optimization level has been specified. That will
821 determine the default value of many flags. */
822 for (i = 1; i < argc; i++)
824 if (!strcmp (argv[i], "-O"))
829 else if (argv[i][0] == '-' && argv[i][1] == 'O')
831 /* Handle -Os, -O2, -O3, -O69, ... */
832 const char *p = &argv[i][2];
834 if ((p[0] == 's') && (p[1] == 0))
838 /* Optimizing for size forces optimize to be 2. */
843 const int optimize_val = read_integral_parameter (p, p - 2, -1);
844 if (optimize_val != -1)
846 optimize = optimize_val;
847 if ((unsigned int) optimize > 255)
855 /* Use priority coloring if cover classes is not defined for the
857 if (targetm.ira_cover_classes == NULL)
858 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
860 /* -O1 optimizations. */
861 opt1 = (optimize >= 1);
862 flag_defer_pop = opt1;
864 flag_delayed_branch = opt1;
866 #ifdef CAN_DEBUG_WITHOUT_FP
867 flag_omit_frame_pointer = opt1;
869 flag_guess_branch_prob = opt1;
870 flag_cprop_registers = opt1;
871 flag_forward_propagate = opt1;
872 flag_if_conversion = opt1;
873 flag_if_conversion2 = opt1;
874 flag_ipa_pure_const = opt1;
875 flag_ipa_reference = opt1;
876 flag_ipa_profile = opt1;
877 flag_merge_constants = opt1;
878 flag_split_wide_types = opt1;
879 flag_tree_ccp = opt1;
880 flag_tree_dce = opt1;
881 flag_tree_dom = opt1;
882 flag_tree_dse = opt1;
883 flag_tree_ter = opt1;
884 flag_tree_sra = opt1;
885 flag_tree_copyrename = opt1;
886 flag_tree_fre = opt1;
887 flag_tree_copy_prop = opt1;
888 flag_tree_sink = opt1;
891 /* -O2 optimizations. */
892 opt2 = (optimize >= 2);
893 flag_inline_small_functions = opt2;
894 flag_indirect_inlining = opt2;
895 flag_thread_jumps = opt2;
896 flag_crossjumping = opt2;
897 flag_optimize_sibling_calls = opt2;
898 flag_cse_follow_jumps = opt2;
900 flag_expensive_optimizations = opt2;
901 flag_rerun_cse_after_loop = opt2;
902 flag_caller_saves = opt2;
903 flag_peephole2 = opt2;
904 #ifdef INSN_SCHEDULING
905 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
906 flag_schedule_insns = opt2 && ! optimize_size;
907 flag_schedule_insns_after_reload = opt2;
910 flag_strict_aliasing = opt2;
911 flag_strict_overflow = opt2;
912 flag_reorder_blocks = opt2;
913 flag_reorder_functions = opt2;
914 flag_tree_vrp = opt2;
915 flag_tree_builtin_call_dce = opt2;
916 flag_tree_pre = opt2;
917 flag_tree_switch_conversion = opt2;
921 /* Track fields in field-sensitive alias analysis. */
922 set_param_value ("max-fields-for-field-sensitive",
923 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
925 /* For -O1 only do loop invariant motion for very small loops. */
926 set_param_value ("loop-invariant-max-bbs-in-loop",
927 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
929 /* -O3 optimizations. */
930 opt3 = (optimize >= 3);
931 flag_predictive_commoning = opt3;
932 flag_inline_functions = opt3;
933 flag_unswitch_loops = opt3;
934 flag_gcse_after_reload = opt3;
935 flag_tree_vectorize = opt3;
936 flag_ipa_cp_clone = opt3;
937 if (flag_ipa_cp_clone)
940 /* Just -O1/-O0 optimizations. */
941 opt1_max = (optimize <= 1);
942 align_loops = opt1_max;
943 align_jumps = opt1_max;
944 align_labels = opt1_max;
945 align_functions = opt1_max;
949 /* Inlining of functions reducing size is a good idea regardless of them
950 being declared inline. */
951 flag_inline_functions = 1;
953 /* Basic optimization options. */
958 /* We want to crossjump as much as possible. */
959 set_param_value ("min-crossjump-insns", 1);
962 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
964 /* Enable -Werror=coverage-mismatch by default */
965 enable_warning_as_error("coverage-mismatch", 1, lang_mask);
969 /* Initialize whether `char' is signed. */
970 flag_signed_char = DEFAULT_SIGNED_CHAR;
971 /* Set this to a special "uninitialized" value. The actual default is
972 set after target options have been processed. */
973 flag_short_enums = 2;
975 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
977 target_flags = targetm.default_target_flags;
979 /* Some targets have ABI-specified unwind tables. */
980 flag_unwind_tables = targetm.unwind_tables_default;
983 /* Clear any options currently held for LTO. */
984 lto_clear_user_options ();
986 #ifdef OPTIMIZATION_OPTIONS
987 /* Allow default optimizations to be specified on a per-machine basis. */
988 OPTIMIZATION_OPTIONS (optimize, optimize_size);
991 read_cmdline_options (argc, argv, lang_mask);
993 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
995 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
996 directory. Then try to make DUMP_BASE_NAME relative to the
997 AUX_BASE_NAME directory, typically the directory to contain
1000 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
1001 else if (aux_base_name)
1003 const char *aux_base;
1005 base_of_path (aux_base_name, &aux_base);
1006 if (aux_base_name != aux_base)
1008 int dir_len = aux_base - aux_base_name;
1009 char *new_dump_base_name =
1010 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
1012 /* Copy directory component from AUX_BASE_NAME. */
1013 memcpy (new_dump_base_name, aux_base_name, dir_len);
1014 /* Append existing DUMP_BASE_NAME. */
1015 strcpy (new_dump_base_name + dir_len, dump_base_name);
1016 dump_base_name = new_dump_base_name;
1021 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1023 if (!flag_unit_at_a_time)
1025 if (flag_section_anchors == 1)
1026 error ("Section anchors must be disabled when unit-at-a-time "
1028 flag_section_anchors = 0;
1029 if (flag_toplevel_reorder == 1)
1030 error ("Toplevel reorder must be disabled when unit-at-a-time "
1032 flag_toplevel_reorder = 0;
1034 /* Unless the user has asked for section anchors, we disable toplevel
1035 reordering at -O0 to disable transformations that might be surprising
1036 to end users and to get -fno-toplevel-reorder tested. */
1037 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1039 flag_toplevel_reorder = 0;
1040 flag_section_anchors = 0;
1042 if (!flag_toplevel_reorder)
1044 if (flag_section_anchors == 1)
1045 error ("section anchors must be disabled when toplevel reorder"
1047 flag_section_anchors = 0;
1053 flag_pic = flag_pie;
1054 if (flag_pic && !flag_pie)
1056 first_time_p = false;
1061 /* Inlining does not work if not optimizing,
1062 so force it not to be done. */
1067 /* The optimization to partition hot and cold basic blocks into separate
1068 sections of the .o and executable files does not work (currently)
1069 with exception handling. This is because there is no support for
1070 generating unwind info. If flag_exceptions is turned on we need to
1071 turn off the partitioning optimization. */
1073 if (flag_exceptions && flag_reorder_blocks_and_partition
1074 && (USING_SJLJ_EXCEPTIONS
1075 #ifdef TARGET_UNWIND_INFO
1080 inform (input_location,
1081 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1082 flag_reorder_blocks_and_partition = 0;
1083 flag_reorder_blocks = 1;
1086 /* If user requested unwind info, then turn off the partitioning
1089 if (flag_unwind_tables && ! targetm.unwind_tables_default
1090 && flag_reorder_blocks_and_partition
1091 && (USING_SJLJ_EXCEPTIONS
1092 #ifdef TARGET_UNWIND_INFO
1097 inform (input_location,
1098 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1099 flag_reorder_blocks_and_partition = 0;
1100 flag_reorder_blocks = 1;
1103 /* If the target requested unwind info, then turn off the partitioning
1104 optimization with a different message. Likewise, if the target does not
1105 support named sections. */
1107 if (flag_reorder_blocks_and_partition
1108 && (!targetm.have_named_sections
1109 || (flag_unwind_tables && targetm.unwind_tables_default
1110 && (USING_SJLJ_EXCEPTIONS
1111 #ifdef TARGET_UNWIND_INFO
1116 inform (input_location,
1117 "-freorder-blocks-and-partition does not work on this architecture");
1118 flag_reorder_blocks_and_partition = 0;
1119 flag_reorder_blocks = 1;
1122 /* Pipelining of outer loops is only possible when general pipelining
1123 capabilities are requested. */
1124 if (!flag_sel_sched_pipelining)
1125 flag_sel_sched_pipelining_outer_loops = 0;
1127 if (!targetm.ira_cover_classes
1128 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1130 inform (input_location,
1131 "-fira-algorithm=CB does not work on this architecture");
1132 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1135 if (flag_conserve_stack)
1137 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1138 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1139 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1140 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1142 if (flag_wpa || flag_ltrans)
1144 /* These passes are not WHOPR compatible yet. */
1146 flag_ipa_reference = 0;
1147 flag_ipa_type_escape = 0;
1149 flag_ipa_struct_reorg = 0;
1152 if (flag_lto || flag_whopr)
1155 flag_generate_lto = 1;
1157 /* When generating IL, do not operate in whole-program mode.
1158 Otherwise, symbols will be privatized too early, causing link
1160 flag_whole_program = 0;
1162 error ("LTO support has not been enabled in this configuration");
1166 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1167 check option consistency. */
1168 if (flag_lto && flag_whopr)
1169 error ("-flto and -fwhopr are mutually exclusive");
1172 #define LEFT_COLUMN 27
1174 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1175 followed by word-wrapped HELP in a second column. */
1177 wrap_help (const char *help,
1179 unsigned int item_width,
1180 unsigned int columns)
1182 unsigned int col_width = LEFT_COLUMN;
1183 unsigned int remaining, room, len;
1185 remaining = strlen (help);
1189 room = columns - 3 - MAX (col_width, item_width);
1198 for (i = 0; help[i]; i++)
1200 if (i >= room && len != remaining)
1204 else if ((help[i] == '-' || help[i] == '/')
1205 && help[i + 1] != ' '
1206 && i > 0 && ISALPHA (help[i - 1]))
1211 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1213 while (help[len] == ' ')
1221 /* Print help for a specific front-end, etc. */
1223 print_filtered_help (unsigned int include_flags,
1224 unsigned int exclude_flags,
1225 unsigned int any_flags,
1226 unsigned int columns)
1230 static char *printed = NULL;
1232 bool displayed = false;
1234 if (include_flags == CL_PARAMS)
1236 for (i = 0; i < LAST_PARAM; i++)
1238 const char *param = compiler_params[i].option;
1240 help = compiler_params[i].help;
1241 if (help == NULL || *help == '\0')
1243 if (exclude_flags & CL_UNDOCUMENTED)
1245 help = undocumented_msg;
1248 /* Get the translation. */
1251 wrap_help (help, param, strlen (param), columns);
1258 printed = XCNEWVAR (char, cl_options_count);
1260 for (i = 0; i < cl_options_count; i++)
1262 static char new_help[128];
1263 const struct cl_option *option = cl_options + i;
1268 if (include_flags == 0
1269 || ((option->flags & include_flags) != include_flags))
1271 if ((option->flags & any_flags) == 0)
1275 /* Skip unwanted switches. */
1276 if ((option->flags & exclude_flags) != 0)
1280 /* Skip switches that have already been printed. */
1286 help = option->help;
1289 if (exclude_flags & CL_UNDOCUMENTED)
1291 help = undocumented_msg;
1294 /* Get the translation. */
1297 /* Find the gap between the name of the
1298 option and its descriptive text. */
1299 tab = strchr (help, '\t');
1308 opt = option->opt_text;
1312 /* With the -Q option enabled we change the descriptive text associated
1313 with an option to be an indication of its current setting. */
1316 if (len < (LEFT_COLUMN + 2))
1317 strcpy (new_help, "\t\t");
1319 strcpy (new_help, "\t");
1321 if (option->flag_var != NULL)
1323 if (option->flags & CL_JOINED)
1325 if (option->var_type == CLVC_STRING)
1327 if (* (const char **) option->flag_var != NULL)
1328 snprintf (new_help + strlen (new_help),
1329 sizeof (new_help) - strlen (new_help),
1330 * (const char **) option->flag_var);
1333 sprintf (new_help + strlen (new_help),
1334 "%#x", * (int *) option->flag_var);
1337 strcat (new_help, option_enabled (i)
1338 ? _("[enabled]") : _("[disabled]"));
1344 wrap_help (help, opt, len, columns);
1350 unsigned int langs = include_flags & CL_LANG_ALL;
1353 printf (_(" No options with the desired characteristics were found\n"));
1358 /* PR 31349: Tell the user how to see all of the
1359 options supported by a specific front end. */
1360 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1361 if ((1U << i) & langs)
1362 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1363 lang_names[i], lang_names[i]);
1367 else if (! displayed)
1368 printf (_(" All options with the desired characteristics have already been displayed\n"));
1373 /* Display help for a specified type of option.
1374 The options must have ALL of the INCLUDE_FLAGS set
1375 ANY of the flags in the ANY_FLAGS set
1376 and NONE of the EXCLUDE_FLAGS set. */
1378 print_specific_help (unsigned int include_flags,
1379 unsigned int exclude_flags,
1380 unsigned int any_flags)
1382 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1383 const char * description = NULL;
1384 const char * descrip_extra = "";
1387 static unsigned int columns = 0;
1389 /* Sanity check: Make sure that we do not have more
1390 languages than we have bits available to enumerate them. */
1391 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1393 /* If we have not done so already, obtain
1394 the desired maximum width of the output. */
1399 GET_ENVIRONMENT (p, "COLUMNS");
1402 int value = atoi (p);
1409 /* Use a reasonable default. */
1413 /* Decide upon the title for the options that we are going to display. */
1414 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1416 switch (flag & include_flags)
1422 description = _("The following options are target specific");
1425 description = _("The following options control compiler warning messages");
1427 case CL_OPTIMIZATION:
1428 description = _("The following options control optimizations");
1431 description = _("The following options are language-independent");
1434 description = _("The --param option recognizes the following as parameters");
1437 if (i >= cl_lang_count)
1439 if (exclude_flags & all_langs_mask)
1440 description = _("The following options are specific to just the language ");
1442 description = _("The following options are supported by the language ");
1443 descrip_extra = lang_names [i];
1448 if (description == NULL)
1452 if (include_flags & CL_UNDOCUMENTED)
1453 description = _("The following options are not documented");
1454 else if (include_flags & CL_SEPARATE)
1455 description = _("The following options take separate arguments");
1456 else if (include_flags & CL_JOINED)
1457 description = _("The following options take joined arguments");
1460 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1467 if (any_flags & all_langs_mask)
1468 description = _("The following options are language-related");
1470 description = _("The following options are language-independent");
1474 printf ("%s%s:\n", description, descrip_extra);
1475 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1478 /* Handle target- and language-independent options. Return zero to
1479 generate an "unknown option" message. Only options that need
1480 extra handling need to be listed here; if you simply want
1481 VALUE assigned to a variable, it happens automatically. */
1484 common_handle_option (size_t scode, const char *arg, int value,
1485 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED)
1487 static bool verbose = false;
1488 enum opt_code code = (enum opt_code) scode;
1503 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1504 unsigned int undoc_mask;
1507 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1508 /* First display any single language specific options. */
1509 for (i = 0; i < cl_lang_count; i++)
1511 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1512 /* Next display any multi language specific options. */
1513 print_specific_help (0, undoc_mask, all_langs_mask);
1514 /* Then display any remaining, non-language options. */
1515 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1516 print_specific_help (i, undoc_mask, 0);
1517 exit_after_options = true;
1521 case OPT_ftarget_help:
1522 case OPT__target_help:
1523 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1524 exit_after_options = true;
1526 /* Allow the target a chance to give the user some additional information. */
1527 if (targetm.target_help)
1528 targetm.target_help ();
1534 const char * a = arg;
1535 unsigned int include_flags = 0;
1536 /* Note - by default we include undocumented options when listing
1537 specific classes. If you only want to see documented options
1538 then add ",^undocumented" to the --help= option. E.g.:
1540 --help=target,^undocumented */
1541 unsigned int exclude_flags = 0;
1543 /* Walk along the argument string, parsing each word in turn.
1545 arg = [^]{word}[,{arg}]
1546 word = {optimizers|target|warnings|undocumented|
1547 params|common|<language>} */
1552 const char * string;
1557 { "optimizers", CL_OPTIMIZATION },
1558 { "target", CL_TARGET },
1559 { "warnings", CL_WARNING },
1560 { "undocumented", CL_UNDOCUMENTED },
1561 { "params", CL_PARAMS },
1562 { "joined", CL_JOINED },
1563 { "separate", CL_SEPARATE },
1564 { "common", CL_COMMON },
1567 unsigned int * pflags;
1569 unsigned int lang_flag, specific_flag;
1576 pflags = & exclude_flags;
1579 pflags = & include_flags;
1581 comma = strchr (a, ',');
1592 /* Check to see if the string matches an option class name. */
1593 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1594 if (strncasecmp (a, specifics[i].string, len) == 0)
1596 specific_flag = specifics[i].flag;
1600 /* Check to see if the string matches a language name.
1601 Note - we rely upon the alpha-sorted nature of the entries in
1602 the lang_names array, specifically that shorter names appear
1603 before their longer variants. (i.e. C before C++). That way
1604 when we are attempting to match --help=c for example we will
1605 match with C first and not C++. */
1606 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1607 if (strncasecmp (a, lang_names[i], len) == 0)
1609 lang_flag = 1U << i;
1613 if (specific_flag != 0)
1616 * pflags |= specific_flag;
1619 /* The option's argument matches both the start of a
1620 language name and the start of an option class name.
1621 We have a special case for when the user has
1622 specified "--help=c", but otherwise we have to issue
1624 if (strncasecmp (a, "c", len) == 0)
1625 * pflags |= lang_flag;
1628 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1632 else if (lang_flag != 0)
1633 * pflags |= lang_flag;
1636 "warning: unrecognized argument to --help= option: %.*s\n",
1645 print_specific_help (include_flags, exclude_flags, 0);
1646 exit_after_options = true;
1652 exit_after_options = true;
1656 g_switch_value = value;
1657 g_switch_set = true;
1662 /* Currently handled in a prescan. */
1666 enable_warning_as_error (arg, value, lang_mask);
1669 case OPT_Wlarger_than_:
1670 /* This form corresponds to -Wlarger-than-.
1671 Kept for backward compatibility.
1672 Don't use it as the first argument of warning(). */
1674 case OPT_Wlarger_than_eq:
1675 larger_than_size = value;
1676 warn_larger_than = value != -1;
1679 case OPT_Wframe_larger_than_:
1680 frame_larger_than_size = value;
1681 warn_frame_larger_than = value != -1;
1684 case OPT_Wstrict_aliasing:
1685 set_Wstrict_aliasing (value);
1688 case OPT_Wstrict_aliasing_:
1689 warn_strict_aliasing = value;
1692 case OPT_Wstrict_overflow:
1693 warn_strict_overflow = (value
1694 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1698 case OPT_Wstrict_overflow_:
1699 warn_strict_overflow = value;
1703 warn_unused = value;
1708 aux_info_file_name = arg;
1709 flag_gen_aux_info = 1;
1713 aux_base_name = arg;
1716 case OPT_auxbase_strip:
1718 char *tmp = xstrdup (arg);
1719 strip_off_ending (tmp, strlen (tmp));
1721 aux_base_name = tmp;
1726 decode_d_option (arg);
1730 dump_base_name = arg;
1734 dump_dir_name = arg;
1737 case OPT_falign_functions_:
1738 align_functions = value;
1741 case OPT_falign_jumps_:
1742 align_jumps = value;
1745 case OPT_falign_labels_:
1746 align_labels = value;
1749 case OPT_falign_loops_:
1750 align_loops = value;
1753 case OPT_fbranch_probabilities:
1754 flag_branch_probabilities_set = true;
1757 case OPT_fcall_used_:
1758 fix_register (arg, 0, 1);
1761 case OPT_fcall_saved_:
1762 fix_register (arg, 0, 0);
1766 dbg_cnt_process_opt (arg);
1769 case OPT_fdbg_cnt_list:
1770 dbg_cnt_list_all_counters ();
1773 case OPT_fdebug_prefix_map_:
1774 add_debug_prefix_map (arg);
1777 case OPT_fdiagnostics_show_location_:
1778 if (!strcmp (arg, "once"))
1779 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1780 else if (!strcmp (arg, "every-line"))
1781 diagnostic_prefixing_rule (global_dc)
1782 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1787 case OPT_fdiagnostics_show_option:
1788 global_dc->show_option_requested = value;
1792 if (!dump_switch_p (arg))
1796 case OPT_fexcess_precision_:
1797 if (!strcmp (arg, "fast"))
1798 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1799 else if (!strcmp (arg, "standard"))
1800 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1802 error ("unknown excess precision style \"%s\"", arg);
1805 case OPT_ffast_math:
1806 set_fast_math_flags (value);
1809 case OPT_funsafe_math_optimizations:
1810 set_unsafe_math_optimizations_flags (value);
1814 fix_register (arg, 1, 1);
1817 case OPT_finline_limit_:
1818 case OPT_finline_limit_eq:
1819 set_param_value ("max-inline-insns-single", value / 2);
1820 set_param_value ("max-inline-insns-auto", value / 2);
1823 case OPT_finstrument_functions_exclude_function_list_:
1824 add_comma_separated_to_vector
1825 (&flag_instrument_functions_exclude_functions, arg);
1828 case OPT_finstrument_functions_exclude_file_list_:
1829 add_comma_separated_to_vector
1830 (&flag_instrument_functions_exclude_files, arg);
1833 case OPT_fmessage_length_:
1834 pp_set_line_maximum_length (global_dc->printer, value);
1837 case OPT_fpack_struct_:
1838 if (value <= 0 || (value & (value - 1)) || value > 16)
1839 error ("structure alignment must be a small power of two, not %d", value);
1842 initial_max_fld_align = value;
1843 maximum_field_alignment = value * BITS_PER_UNIT;
1847 case OPT_fpeel_loops:
1848 flag_peel_loops_set = true;
1852 #ifdef ENABLE_PLUGIN
1853 add_new_plugin (arg);
1855 error ("Plugin support is disabled. Configure with --enable-plugin.");
1859 case OPT_fplugin_arg_:
1860 #ifdef ENABLE_PLUGIN
1861 parse_plugin_arg_opt (arg);
1863 error ("Plugin support is disabled. Configure with --enable-plugin.");
1867 case OPT_fprofile_arcs:
1868 profile_arc_flag_set = true;
1871 case OPT_finline_functions:
1872 flag_inline_functions_set = true;
1875 case OPT_fprofile_dir_:
1876 profile_data_prefix = xstrdup (arg);
1879 case OPT_fprofile_use_:
1880 profile_data_prefix = xstrdup (arg);
1881 flag_profile_use = true;
1883 /* No break here - do -fprofile-use processing. */
1884 case OPT_fprofile_use:
1885 if (!flag_branch_probabilities_set)
1886 flag_branch_probabilities = value;
1887 if (!flag_profile_values_set)
1888 flag_profile_values = value;
1889 if (!flag_unroll_loops_set)
1890 flag_unroll_loops = value;
1891 if (!flag_peel_loops_set)
1892 flag_peel_loops = value;
1893 if (!flag_tracer_set)
1894 flag_tracer = value;
1895 if (!flag_value_profile_transformations_set)
1896 flag_value_profile_transformations = value;
1897 if (!flag_inline_functions_set)
1898 flag_inline_functions = value;
1899 if (!flag_ipa_cp_set)
1900 flag_ipa_cp = value;
1901 if (!flag_ipa_cp_clone_set
1902 && value && flag_ipa_cp)
1903 flag_ipa_cp_clone = value;
1904 if (!flag_predictive_commoning_set)
1905 flag_predictive_commoning = value;
1906 if (!flag_unswitch_loops_set)
1907 flag_unswitch_loops = value;
1908 if (!flag_gcse_after_reload_set)
1909 flag_gcse_after_reload = value;
1912 case OPT_fprofile_generate_:
1913 profile_data_prefix = xstrdup (arg);
1915 /* No break here - do -fprofile-generate processing. */
1916 case OPT_fprofile_generate:
1917 if (!profile_arc_flag_set)
1918 profile_arc_flag = value;
1919 if (!flag_profile_values_set)
1920 flag_profile_values = value;
1921 if (!flag_value_profile_transformations_set)
1922 flag_value_profile_transformations = value;
1923 if (!flag_inline_functions_set)
1924 flag_inline_functions = value;
1927 case OPT_fprofile_values:
1928 flag_profile_values_set = true;
1931 case OPT_fvisibility_:
1933 if (!strcmp(arg, "default"))
1934 default_visibility = VISIBILITY_DEFAULT;
1935 else if (!strcmp(arg, "internal"))
1936 default_visibility = VISIBILITY_INTERNAL;
1937 else if (!strcmp(arg, "hidden"))
1938 default_visibility = VISIBILITY_HIDDEN;
1939 else if (!strcmp(arg, "protected"))
1940 default_visibility = VISIBILITY_PROTECTED;
1942 error ("unrecognized visibility value \"%s\"", arg);
1947 flag_value_profile_transformations_set = true;
1950 case OPT_frandom_seed:
1951 /* The real switch is -fno-random-seed. */
1954 set_random_seed (NULL);
1957 case OPT_frandom_seed_:
1958 set_random_seed (arg);
1961 case OPT_fselective_scheduling:
1962 case OPT_fselective_scheduling2:
1963 sel_sched_switch_set = true;
1966 case OPT_fsched_verbose_:
1967 #ifdef INSN_SCHEDULING
1968 fix_sched_param ("verbose", arg);
1974 case OPT_fsched_stalled_insns_:
1975 flag_sched_stalled_insns = value;
1976 if (flag_sched_stalled_insns == 0)
1977 flag_sched_stalled_insns = -1;
1980 case OPT_fsched_stalled_insns_dep_:
1981 flag_sched_stalled_insns_dep = value;
1984 case OPT_fstack_check_:
1985 if (!strcmp (arg, "no"))
1986 flag_stack_check = NO_STACK_CHECK;
1987 else if (!strcmp (arg, "generic"))
1988 /* This is the old stack checking method. */
1989 flag_stack_check = STACK_CHECK_BUILTIN
1990 ? FULL_BUILTIN_STACK_CHECK
1991 : GENERIC_STACK_CHECK;
1992 else if (!strcmp (arg, "specific"))
1993 /* This is the new stack checking method. */
1994 flag_stack_check = STACK_CHECK_BUILTIN
1995 ? FULL_BUILTIN_STACK_CHECK
1996 : STACK_CHECK_STATIC_BUILTIN
1997 ? STATIC_BUILTIN_STACK_CHECK
1998 : GENERIC_STACK_CHECK;
2000 warning (0, "unknown stack check parameter \"%s\"", arg);
2003 case OPT_fstack_check:
2004 /* This is the same as the "specific" mode above. */
2006 flag_stack_check = STACK_CHECK_BUILTIN
2007 ? FULL_BUILTIN_STACK_CHECK
2008 : STACK_CHECK_STATIC_BUILTIN
2009 ? STATIC_BUILTIN_STACK_CHECK
2010 : GENERIC_STACK_CHECK;
2012 flag_stack_check = NO_STACK_CHECK;
2015 case OPT_fstack_limit:
2016 /* The real switch is -fno-stack-limit. */
2019 stack_limit_rtx = NULL_RTX;
2022 case OPT_fstack_limit_register_:
2024 int reg = decode_reg_name (arg);
2026 error ("unrecognized register name \"%s\"", arg);
2028 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2032 case OPT_fstack_limit_symbol_:
2033 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2036 case OPT_ftree_vectorizer_verbose_:
2037 vect_set_verbosity_level (arg);
2040 case OPT_ftls_model_:
2041 if (!strcmp (arg, "global-dynamic"))
2042 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2043 else if (!strcmp (arg, "local-dynamic"))
2044 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2045 else if (!strcmp (arg, "initial-exec"))
2046 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2047 else if (!strcmp (arg, "local-exec"))
2048 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2050 warning (0, "unknown tls-model \"%s\"", arg);
2053 case OPT_fira_algorithm_:
2054 if (!strcmp (arg, "CB"))
2055 flag_ira_algorithm = IRA_ALGORITHM_CB;
2056 else if (!strcmp (arg, "priority"))
2057 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2059 warning (0, "unknown ira algorithm \"%s\"", arg);
2062 case OPT_fira_region_:
2063 if (!strcmp (arg, "one"))
2064 flag_ira_region = IRA_REGION_ONE;
2065 else if (!strcmp (arg, "all"))
2066 flag_ira_region = IRA_REGION_ALL;
2067 else if (!strcmp (arg, "mixed"))
2068 flag_ira_region = IRA_REGION_MIXED;
2070 warning (0, "unknown ira region \"%s\"", arg);
2073 case OPT_fira_verbose_:
2074 flag_ira_verbose = value;
2078 flag_tracer_set = true;
2082 flag_ipa_cp_set = true;
2085 case OPT_fipa_cp_clone:
2086 flag_ipa_cp_clone_set = true;
2089 case OPT_fpredictive_commoning:
2090 flag_predictive_commoning_set = true;
2093 case OPT_funswitch_loops:
2094 flag_unswitch_loops_set = true;
2097 case OPT_fgcse_after_reload:
2098 flag_gcse_after_reload_set = true;
2101 case OPT_funroll_loops:
2102 flag_unroll_loops_set = true;
2106 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2110 set_debug_level (SDB_DEBUG, false, arg);
2114 if (value < 2 || value > 4)
2115 error ("dwarf version %d is not supported", value);
2117 dwarf_version = value;
2118 set_debug_level (DWARF2_DEBUG, false, "");
2122 set_debug_level (NO_DEBUG, 2, arg);
2127 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2131 set_debug_level (VMS_DEBUG, false, arg);
2136 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2140 asm_file_name = arg;
2143 case OPT_pedantic_errors:
2144 flag_pedantic_errors = pedantic = 1;
2148 case OPT_fcse_skip_blocks:
2149 case OPT_floop_optimize:
2150 case OPT_frerun_loop_opt:
2151 case OPT_fsched2_use_traces:
2152 case OPT_fstrength_reduce:
2153 case OPT_ftree_store_copy_prop:
2154 case OPT_fforce_addr:
2155 case OPT_ftree_salias:
2156 case OPT_ftree_store_ccp:
2157 case OPT_Wunreachable_code:
2158 case OPT_fargument_alias:
2159 case OPT_fargument_noalias:
2160 case OPT_fargument_noalias_anything:
2161 case OPT_fargument_noalias_global:
2162 /* These are no-ops, preserved for backward compatibility. */
2165 case OPT_fuse_linker_plugin:
2166 /* No-op. Used by the driver and passed to us because it starts with f.*/
2170 /* If the flag was handled in a standard way, assume the lack of
2171 processing here is intentional. */
2172 gcc_assert (cl_options[scode].flag_var);
2179 /* Handle --param NAME=VALUE. */
2181 handle_param (const char *carg)
2186 arg = xstrdup (carg);
2187 equal = strchr (arg, '=');
2189 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2192 value = integral_argument (equal + 1);
2194 error ("invalid --param value %qs", equal + 1);
2198 set_param_value (arg, value);
2205 /* Used to set the level of strict aliasing warnings,
2206 when no level is specified (i.e., when -Wstrict-aliasing, and not
2207 -Wstrict-aliasing=level was given).
2208 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2209 and 0 otherwise. After calling this function, wstrict_aliasing will be
2210 set to the default value of -Wstrict_aliasing=level, currently 3. */
2212 set_Wstrict_aliasing (int onoff)
2214 gcc_assert (onoff == 0 || onoff == 1);
2216 warn_strict_aliasing = 3;
2218 warn_strict_aliasing = 0;
2221 /* The following routines are useful in setting all the flags that
2222 -ffast-math and -fno-fast-math imply. */
2224 set_fast_math_flags (int set)
2226 flag_unsafe_math_optimizations = set;
2227 set_unsafe_math_optimizations_flags (set);
2228 flag_finite_math_only = set;
2229 flag_errno_math = !set;
2232 flag_signaling_nans = 0;
2233 flag_rounding_math = 0;
2234 flag_cx_limited_range = 1;
2238 /* When -funsafe-math-optimizations is set the following
2239 flags are set as well. */
2241 set_unsafe_math_optimizations_flags (int set)
2243 flag_trapping_math = !set;
2244 flag_signed_zeros = !set;
2245 flag_associative_math = set;
2246 flag_reciprocal_math = set;
2249 /* Return true iff flags are set as if -ffast-math. */
2251 fast_math_flags_set_p (void)
2253 return (!flag_trapping_math
2254 && flag_unsafe_math_optimizations
2255 && flag_finite_math_only
2256 && !flag_signed_zeros
2257 && !flag_errno_math);
2260 /* Return true iff flags are set as if -ffast-math but using the flags stored
2261 in the struct cl_optimization structure. */
2263 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2265 return (!opt->flag_trapping_math
2266 && opt->flag_unsafe_math_optimizations
2267 && opt->flag_finite_math_only
2268 && !opt->flag_signed_zeros
2269 && !opt->flag_errno_math);
2272 /* Handle a debug output -g switch. EXTENDED is true or false to support
2273 extended output (2 is special and means "-ggdb" was given). */
2275 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2277 static bool type_explicit;
2279 use_gnu_debug_info_extensions = extended;
2281 if (type == NO_DEBUG)
2283 if (write_symbols == NO_DEBUG)
2285 write_symbols = PREFERRED_DEBUGGING_TYPE;
2289 #ifdef DWARF2_DEBUGGING_INFO
2290 write_symbols = DWARF2_DEBUG;
2291 #elif defined DBX_DEBUGGING_INFO
2292 write_symbols = DBX_DEBUG;
2296 if (write_symbols == NO_DEBUG)
2297 warning (0, "target system does not support debug output");
2302 /* Does it conflict with an already selected type? */
2303 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2304 error ("debug format \"%s\" conflicts with prior selection",
2305 debug_type_names[type]);
2306 write_symbols = type;
2307 type_explicit = true;
2310 /* A debug flag without a level defaults to level 2. */
2313 if (!debug_info_level)
2314 debug_info_level = DINFO_LEVEL_NORMAL;
2318 int argval = integral_argument (arg);
2320 error ("unrecognised debug output level \"%s\"", arg);
2321 else if (argval > 3)
2322 error ("debug output level %s is too high", arg);
2324 debug_info_level = (enum debug_info_level) argval;
2328 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2329 a simple on-off switch. */
2332 option_enabled (int opt_idx)
2334 const struct cl_option *option = &(cl_options[opt_idx]);
2336 if (option->flag_var)
2337 switch (option->var_type)
2340 return *(int *) option->flag_var != 0;
2343 return *(int *) option->flag_var == option->var_value;
2345 case CLVC_BIT_CLEAR:
2346 return (*(int *) option->flag_var & option->var_value) == 0;
2349 return (*(int *) option->flag_var & option->var_value) != 0;
2357 /* Fill STATE with the current state of option OPTION. Return true if
2358 there is some state to store. */
2361 get_option_state (int option, struct cl_option_state *state)
2363 if (cl_options[option].flag_var == 0)
2366 switch (cl_options[option].var_type)
2370 state->data = cl_options[option].flag_var;
2371 state->size = sizeof (int);
2374 case CLVC_BIT_CLEAR:
2376 state->ch = option_enabled (option);
2377 state->data = &state->ch;
2382 state->data = *(const char **) cl_options[option].flag_var;
2383 if (state->data == 0)
2385 state->size = strlen ((const char *) state->data) + 1;
2391 /* Set *OPTION according to VALUE and ARG. */
2394 set_option (int opt_index, int value, const char *arg, int kind)
2396 const struct cl_option *option = &cl_options[opt_index];
2398 if (!option->flag_var)
2401 switch (option->var_type)
2404 *(int *) option->flag_var = value;
2408 *(int *) option->flag_var = (value
2410 : !option->var_value);
2413 case CLVC_BIT_CLEAR:
2415 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2416 *(int *) option->flag_var |= option->var_value;
2418 *(int *) option->flag_var &= ~option->var_value;
2419 if (option->flag_var == &target_flags)
2420 target_flags_explicit |= option->var_value;
2424 *(const char **) option->flag_var = arg;
2428 if ((diagnostic_t)kind != DK_UNSPECIFIED)
2429 diagnostic_classify_diagnostic (global_dc, opt_index, (diagnostic_t)kind);
2433 /* Callback function, called when -Werror= enables a warning. */
2435 static void (*warning_as_error_callback) (int) = NULL;
2437 /* Register a callback for enable_warning_as_error calls. */
2440 register_warning_as_error_callback (void (*callback) (int))
2442 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2443 warning_as_error_callback = callback;
2446 /* Enable a warning option as an error. This is used by -Werror= and
2447 also by legacy Werror-implicit-function-declaration. */
2450 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2455 new_option = XNEWVEC (char, strlen (arg) + 2);
2456 new_option[0] = 'W';
2457 strcpy (new_option + 1, arg);
2458 option_index = find_opt (new_option, lang_mask);
2459 if (option_index == N_OPTS)
2461 error ("-Werror=%s: No option -%s", arg, new_option);
2465 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2467 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2468 if (kind == DK_ERROR)
2470 const struct cl_option * const option = cl_options + option_index;
2472 /* -Werror=foo implies -Wfoo. */
2473 if (option->var_type == CLVC_BOOLEAN)
2474 handle_option (option_index, value, arg, lang_mask, (int)kind);
2476 if (warning_as_error_callback)
2477 warning_as_error_callback (option_index);