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 "opts-diagnostic.h"
40 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
41 #include "insn-attr.h" /* For INSN_SCHEDULING. */
43 #include "tree-pass.h"
48 #include "lto-streamer.h"
50 /* Value of the -G xx switch, and whether it was passed or not. */
51 unsigned HOST_WIDE_INT g_switch_value;
54 /* Same for selective scheduling. */
55 bool sel_sched_switch_set;
57 /* True if we should exit after parsing options. */
58 bool exit_after_options;
60 /* True to warn about any objects definitions whose size is larger
61 than N bytes. Also want about function definitions whose returned
62 values are larger than N bytes, where N is `larger_than_size'. */
63 bool warn_larger_than;
64 HOST_WIDE_INT larger_than_size;
66 /* True to warn about any function whose frame size is larger
68 bool warn_frame_larger_than;
69 HOST_WIDE_INT frame_larger_than_size;
71 /* Type(s) of debugging information we are producing (if any). See
72 flags.h for the definitions of the different possible types of
73 debugging information. */
74 enum debug_info_type write_symbols = NO_DEBUG;
76 /* Level of debugging information we are producing. See flags.h for
77 the definitions of the different possible levels. */
78 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
80 /* A major contribution to object and executable size is debug
81 information size. A major contribution to debug information size
82 is struct descriptions replicated in several object files. The
83 following flags attempt to reduce this information. The basic
84 idea is to not emit struct debugging information in the current
85 compilation unit when that information will be generated by
86 another compilation unit.
88 Debug information for a struct defined in the current source
89 file should be generated in the object file. Likewise the
90 debug information for a struct defined in a header should be
91 generated in the object file of the corresponding source file.
92 Both of these case are handled when the base name of the file of
93 the struct definition matches the base name of the source file
94 of the current compilation unit. This matching emits minimal
95 struct debugging information.
97 The base file name matching rule above will fail to emit debug
98 information for structs defined in system headers. So a second
99 category of files includes system headers in addition to files
102 The remaining types of files are library headers and application
103 headers. We cannot currently distinguish these two types. */
105 enum debug_struct_file
107 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
108 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
109 same base name as the compilation unit. */
110 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
112 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
115 /* Generic structs (e.g. templates not explicitly specialized)
116 may not have a compilation unit associated with them, and so
117 may need to be treated differently from ordinary structs.
119 Structs only handled by reference (indirectly), will also usually
120 not need as much debugging information. */
122 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
123 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
124 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
125 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
127 /* Parse the -femit-struct-debug-detailed option value
128 and set the flag variables. */
130 #define MATCH( prefix, string ) \
131 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
132 ? ((string += sizeof prefix - 1), 1) : 0)
135 set_struct_debug_option (const char *spec)
137 /* various labels for comparison */
138 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
139 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
140 static char none_lbl[] = "none", any_lbl[] = "any";
141 static char base_lbl[] = "base", sys_lbl[] = "sys";
143 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
144 /* Default is to apply to as much as possible. */
145 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
146 int ord = 1, gen = 1;
149 if (MATCH (dfn_lbl, spec))
150 usage = DINFO_USAGE_DFN;
151 else if (MATCH (dir_lbl, spec))
152 usage = DINFO_USAGE_DIR_USE;
153 else if (MATCH (ind_lbl, spec))
154 usage = DINFO_USAGE_IND_USE;
156 /* Generics or not? */
157 if (MATCH (ord_lbl, spec))
159 else if (MATCH (gen_lbl, spec))
162 /* What allowable environment? */
163 if (MATCH (none_lbl, spec))
164 files = DINFO_STRUCT_FILE_NONE;
165 else if (MATCH (any_lbl, spec))
166 files = DINFO_STRUCT_FILE_ANY;
167 else if (MATCH (sys_lbl, spec))
168 files = DINFO_STRUCT_FILE_SYS;
169 else if (MATCH (base_lbl, spec))
170 files = DINFO_STRUCT_FILE_BASE;
172 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
175 /* Effect the specification. */
176 if (usage == DINFO_USAGE_NUM_ENUMS)
180 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
181 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
182 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
186 debug_struct_generic[DINFO_USAGE_DFN] = files;
187 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
188 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
194 debug_struct_ordinary[usage] = files;
196 debug_struct_generic[usage] = files;
200 set_struct_debug_option (spec+1);
203 /* No more -femit-struct-debug-detailed specifications.
206 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
208 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
209 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
210 || debug_struct_generic[DINFO_USAGE_DIR_USE]
211 < debug_struct_generic[DINFO_USAGE_IND_USE])
212 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
213 " as much as %<-femit-struct-debug-detailed=ind:...%>");
217 /* Find the base name of a path, stripping off both directories and
218 a single final extension. */
220 base_of_path (const char *path, const char **base_out)
222 const char *base = path;
224 const char *p = path;
228 if (IS_DIR_SEPARATOR(c))
243 /* Match the base name of a file to the base name of a compilation unit. */
245 static const char *main_input_basename;
246 static int main_input_baselength;
249 matches_main_base (const char *path)
251 /* Cache the last query. */
252 static const char *last_path = NULL;
253 static int last_match = 0;
254 if (path != last_path)
257 int length = base_of_path (path, &base);
259 last_match = (length == main_input_baselength
260 && memcmp (base, main_input_basename, length) == 0);
265 #ifdef DEBUG_DEBUG_STRUCT
268 dump_struct_debug (tree type, enum debug_info_usage usage,
269 enum debug_struct_file criterion, int generic,
270 int matches, int result)
272 /* Find the type name. */
273 tree type_decl = TYPE_STUB_DECL (type);
275 const char *name = 0;
276 if (TREE_CODE (t) == TYPE_DECL)
279 name = IDENTIFIER_POINTER (t);
281 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
283 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
284 matches ? "bas" : "hdr",
285 generic ? "gen" : "ord",
286 usage == DINFO_USAGE_DFN ? ";" :
287 usage == DINFO_USAGE_DIR_USE ? "." : "*",
289 (void*) type_decl, name);
292 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
293 dump_struct_debug (type, usage, criterion, generic, matches, result)
297 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
304 should_emit_struct_debug (tree type, enum debug_info_usage usage)
306 enum debug_struct_file criterion;
308 bool generic = lang_hooks.types.generic_p (type);
311 criterion = debug_struct_generic[usage];
313 criterion = debug_struct_ordinary[usage];
315 if (criterion == DINFO_STRUCT_FILE_NONE)
316 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
317 if (criterion == DINFO_STRUCT_FILE_ANY)
318 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
320 type_decl = TYPE_STUB_DECL (type);
322 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
323 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
325 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
326 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
327 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
330 /* Nonzero means use GNU-only extensions in the generated symbolic
331 debugging information. Currently, this only has an effect when
332 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
333 bool use_gnu_debug_info_extensions;
335 /* The default visibility for all symbols (unless overridden) */
336 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
338 /* Global visibility options. */
339 struct visibility_flags visibility_options;
341 /* What to print when a switch has no documentation. */
342 static const char undocumented_msg[] = N_("This switch lacks documentation");
344 /* Used for bookkeeping on whether user set these flags so
345 -fprofile-use/-fprofile-generate does not use them. */
346 static bool profile_arc_flag_set, flag_profile_values_set;
347 static bool flag_unroll_loops_set, flag_tracer_set;
348 static bool flag_value_profile_transformations_set;
349 static bool flag_peel_loops_set, flag_branch_probabilities_set;
350 static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set;
351 static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set;
353 /* Functions excluded from profiling. */
355 typedef char *char_p; /* For DEF_VEC_P. */
357 DEF_VEC_ALLOC_P(char_p,heap);
359 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
360 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
362 typedef const char *const_char_p; /* For DEF_VEC_P. */
363 DEF_VEC_P(const_char_p);
364 DEF_VEC_ALLOC_P(const_char_p,heap);
366 static VEC(const_char_p,heap) *ignored_options;
368 /* Language specific warning pass for unused results. */
369 bool flag_warn_unused_result = false;
371 /* Input file names. */
372 const char **in_fnames;
373 unsigned num_in_fnames;
375 static int common_handle_option (size_t scode, const char *arg, int value,
376 unsigned int lang_mask, int kind);
377 static void handle_param (const char *);
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 set_debug_level (enum debug_info_type type, int extended,
384 /* Return a malloced slash-separated list of languages in MASK. */
386 write_langs (unsigned int mask)
388 unsigned int n = 0, len = 0;
389 const char *lang_name;
392 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
393 if (mask & (1U << n))
394 len += strlen (lang_name) + 1;
396 result = XNEWVEC (char, len);
398 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
399 if (mask & (1U << n))
403 strcpy (result + len, lang_name);
404 len += strlen (lang_name);
412 /* Complain that switch OPT_INDEX does not apply to this front end. */
414 complain_wrong_lang (const char *text, const struct cl_option *option,
415 unsigned int lang_mask)
417 char *ok_langs, *bad_lang;
419 /* The LTO front end inherits all the options from the first front
420 end that was used. However, not all the original front end
421 options make sense in LTO.
423 A real solution would be to filter this in collect2, but collect2
424 does not have access to all the option attributes to know what to
425 filter. So, in lto1 we silently accept inherited flags and do
427 if (lang_mask & CL_LTO)
430 ok_langs = write_langs (option->flags);
431 bad_lang = write_langs (lang_mask);
433 /* Eventually this should become a hard error IMO. */
434 warning (0, "command line option \"%s\" is valid for %s but not for %s",
435 text, ok_langs, bad_lang);
441 /* Buffer the unknown option described by the string OPT. Currently,
442 we only complain about unknown -Wno-* options if they may have
443 prevented a diagnostic. Otherwise, we just ignore them.
444 Note that if we do complain, it is only as a warning, not an error;
445 passing the compiler an unrecognised -Wno-* option should never
446 change whether the compilation succeeds or fails. */
448 static void postpone_unknown_option_warning(const char *opt)
450 VEC_safe_push (const_char_p, heap, ignored_options, opt);
453 /* Produce a warning for each option previously buffered. */
455 void print_ignored_options (void)
457 location_t saved_loc = input_location;
461 while (!VEC_empty (const_char_p, ignored_options))
464 opt = VEC_pop (const_char_p, ignored_options);
465 warning (0, "unrecognized command line option \"%s\"", opt);
468 input_location = saved_loc;
472 /* Handle option OPT_INDEX, and argument ARG, for the language
473 indicated by LANG_MASK. VALUE is true, unless no- form of an -f or
474 -W option was given. KIND is the diagnostic_t if this is a
475 diagnostics option, DK_UNSPECIFIED otherwise. Returns false if the
476 switch was invalid. */
478 handle_option (int opt_index, int value, const char *arg,
479 unsigned int lang_mask, int kind)
481 const struct cl_option *option = &cl_options[opt_index];
483 if (option->flag_var)
484 set_option (opt_index, value, arg, kind);
486 if (option->flags & lang_mask)
488 if (lang_hooks.handle_option (opt_index, arg, value, kind) == 0)
492 lto_register_user_option (opt_index, arg, value, lang_mask);
496 if (option->flags & CL_COMMON)
498 if (common_handle_option (opt_index, arg, value, lang_mask, kind) == 0)
502 lto_register_user_option (opt_index, arg, value, CL_COMMON);
506 if (option->flags & CL_TARGET)
508 if (!targetm.handle_option (opt_index, arg, value))
512 lto_register_user_option (opt_index, arg, value, CL_TARGET);
518 /* Handle the switch beginning at ARGV for the language indicated by
519 LANG_MASK. Returns the number of switches consumed. */
521 read_cmdline_option (const char **argv, unsigned int lang_mask)
523 struct cl_decoded_option decoded;
526 const struct cl_option *option;
530 result = decode_cmdline_option (argv, lang_mask, &decoded);
531 if (decoded.opt_index == cl_options_count)
533 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
534 /* We don't generate warnings for unknown -Wno-* options
535 unless we issue diagnostics. */
536 postpone_unknown_option_warning (argv[0]);
538 error ("unrecognized command line option %qs", opt);
542 option = &cl_options[decoded.opt_index];
544 if (decoded.errors & CL_ERR_DISABLED)
546 error ("command line option %qs"
547 " is not supported by this configuration", opt);
551 if (decoded.errors & CL_ERR_WRONG_LANG)
553 complain_wrong_lang (argv[0], option, lang_mask);
557 if (decoded.errors & CL_ERR_MISSING_ARG)
559 if (!lang_hooks.missing_argument (opt, decoded.opt_index))
560 error ("missing argument to %qs", opt);
564 if (decoded.errors & CL_ERR_UINT_ARG)
566 error ("argument to %qs should be a non-negative integer",
571 gcc_assert (!decoded.errors);
573 if (!handle_option (decoded.opt_index, decoded.value, decoded.arg,
574 lang_mask, DK_UNSPECIFIED))
575 error ("unrecognized command line option %qs", opt);
581 /* Handle FILENAME from the command line. */
583 add_input_filename (const char *filename)
586 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
587 in_fnames[num_in_fnames - 1] = filename;
590 /* Add comma-separated strings to a char_p vector. */
593 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
600 /* We never free this string. */
613 VEC_safe_push (char_p, heap, *pvec, token_start);
616 if (*r == '\\' && r[1] == ',')
624 if (*token_start != '\0')
625 VEC_safe_push (char_p, heap, *pvec, token_start);
628 /* Return whether we should exclude FNDECL from instrumentation. */
631 flag_instrument_functions_exclude_p (tree fndecl)
633 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
639 name = lang_hooks.decl_printable_name (fndecl, 0);
641 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
645 if (strstr (name, s) != NULL)
650 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
656 name = DECL_SOURCE_FILE (fndecl);
658 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
661 if (strstr (name, s) != NULL)
670 /* Decode and handle the vector of command line options. LANG_MASK
671 contains has a single bit set representing the current
674 read_cmdline_options (unsigned int argc, const char **argv, unsigned int lang_mask)
678 for (i = 1; i < argc; i += n)
680 const char *opt = argv[i];
682 /* Interpret "-" or a non-switch as a file name. */
683 if (opt[0] != '-' || opt[1] == '\0')
685 if (main_input_filename == NULL)
687 main_input_filename = opt;
688 main_input_baselength
689 = base_of_path (main_input_filename, &main_input_basename);
691 add_input_filename (opt);
696 n = read_cmdline_option (argv + i, lang_mask);
700 /* Parse command line options and set default flag values. Do minimal
701 options processing. */
703 decode_options (unsigned int argc, const char **argv)
705 static bool first_time_p = true;
706 static int initial_min_crossjump_insns;
707 static int initial_max_fields_for_field_sensitive;
708 static int initial_loop_invariant_max_bbs_in_loop;
709 static unsigned int initial_lang_mask;
711 unsigned int i, lang_mask;
720 /* Perform language-specific options initialization. */
721 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
723 lang_hooks.initialize_diagnostics (global_dc);
725 /* Save initial values of parameters we reset. */
726 initial_min_crossjump_insns
727 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
728 initial_max_fields_for_field_sensitive
729 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
730 initial_loop_invariant_max_bbs_in_loop
731 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
734 lang_mask = initial_lang_mask;
736 /* Scan to see what optimization level has been specified. That will
737 determine the default value of many flags. */
738 for (i = 1; i < argc; i++)
740 if (!strcmp (argv[i], "-O"))
746 else if (argv[i][0] == '-' && argv[i][1] == 'O')
748 /* Handle -Os, -O2, -O3, -O69, ... */
749 const char *p = &argv[i][2];
751 if ((p[0] == 's') && (p[1] == 0))
755 /* Optimizing for size forces optimize to be 2. */
759 else if (strcmp (p, "fast") == 0)
761 /* -Ofast only adds flags to -O3. */
768 const int optimize_val = read_integral_parameter (p, p - 2, -1);
769 if (optimize_val != -1)
771 optimize = optimize_val;
772 if ((unsigned int) optimize > 255)
781 /* Use priority coloring if cover classes is not defined for the
783 if (targetm.ira_cover_classes == NULL)
784 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
786 /* -O1 optimizations. */
787 opt1 = (optimize >= 1);
788 flag_defer_pop = opt1;
790 flag_delayed_branch = opt1;
792 #ifdef CAN_DEBUG_WITHOUT_FP
793 flag_omit_frame_pointer = opt1;
795 flag_guess_branch_prob = opt1;
796 flag_cprop_registers = opt1;
797 flag_forward_propagate = opt1;
798 flag_if_conversion = opt1;
799 flag_if_conversion2 = opt1;
800 flag_ipa_pure_const = opt1;
801 flag_ipa_reference = opt1;
802 flag_ipa_profile = opt1;
803 flag_merge_constants = opt1;
804 flag_split_wide_types = opt1;
805 flag_tree_ccp = opt1;
806 flag_tree_dce = opt1;
807 flag_tree_dom = opt1;
808 flag_tree_dse = opt1;
809 flag_tree_ter = opt1;
810 flag_tree_sra = opt1;
811 flag_tree_copyrename = opt1;
812 flag_tree_fre = opt1;
813 flag_tree_copy_prop = opt1;
814 flag_tree_sink = opt1;
817 /* -O2 optimizations. */
818 opt2 = (optimize >= 2);
819 flag_inline_small_functions = opt2;
820 flag_indirect_inlining = opt2;
821 flag_thread_jumps = opt2;
822 flag_crossjumping = opt2;
823 flag_optimize_sibling_calls = opt2;
824 flag_cse_follow_jumps = opt2;
826 flag_expensive_optimizations = opt2;
827 flag_rerun_cse_after_loop = opt2;
828 flag_caller_saves = opt2;
829 flag_peephole2 = opt2;
830 #ifdef INSN_SCHEDULING
831 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
832 flag_schedule_insns = opt2 && ! optimize_size;
833 flag_schedule_insns_after_reload = opt2;
836 flag_strict_aliasing = opt2;
837 flag_strict_overflow = opt2;
838 flag_reorder_blocks = opt2;
839 flag_reorder_functions = opt2;
840 flag_tree_vrp = opt2;
841 flag_tree_builtin_call_dce = opt2;
842 flag_tree_pre = opt2;
843 flag_tree_switch_conversion = opt2;
847 /* Track fields in field-sensitive alias analysis. */
848 set_param_value ("max-fields-for-field-sensitive",
849 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
851 /* For -O1 only do loop invariant motion for very small loops. */
852 set_param_value ("loop-invariant-max-bbs-in-loop",
853 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
855 /* -O3 optimizations. */
856 opt3 = (optimize >= 3);
857 flag_predictive_commoning = opt3;
858 flag_inline_functions = opt3;
859 flag_unswitch_loops = opt3;
860 flag_gcse_after_reload = opt3;
861 flag_tree_vectorize = opt3;
862 flag_ipa_cp_clone = opt3;
863 if (flag_ipa_cp_clone)
866 /* Just -O1/-O0 optimizations. */
867 opt1_max = (optimize <= 1);
868 align_loops = opt1_max;
869 align_jumps = opt1_max;
870 align_labels = opt1_max;
871 align_functions = opt1_max;
875 /* Inlining of functions reducing size is a good idea regardless of them
876 being declared inline. */
877 flag_inline_functions = 1;
879 /* Basic optimization options. */
884 /* We want to crossjump as much as possible. */
885 set_param_value ("min-crossjump-insns", 1);
888 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
890 /* -Ofast adds optimizations to -O3. */
893 /* Which is -ffast-math for now. */
894 set_fast_math_flags (1);
895 /* Allow targets to enable extra options with -Ofast
896 before general options processing so disabling them
897 again afterwards works. */
898 targetm.handle_ofast ();
901 /* Enable -Werror=coverage-mismatch by default */
902 enable_warning_as_error("coverage-mismatch", 1, lang_mask);
906 /* Initialize whether `char' is signed. */
907 flag_signed_char = DEFAULT_SIGNED_CHAR;
908 /* Set this to a special "uninitialized" value. The actual default is
909 set after target options have been processed. */
910 flag_short_enums = 2;
912 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
914 target_flags = targetm.default_target_flags;
916 /* Some targets have ABI-specified unwind tables. */
917 flag_unwind_tables = targetm.unwind_tables_default;
921 /* Clear any options currently held for LTO. */
922 lto_clear_user_options ();
925 #ifdef OPTIMIZATION_OPTIONS
926 /* Allow default optimizations to be specified on a per-machine basis. */
927 OPTIMIZATION_OPTIONS (optimize, optimize_size);
930 read_cmdline_options (argc, argv, lang_mask);
932 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
934 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
935 directory. Then try to make DUMP_BASE_NAME relative to the
936 AUX_BASE_NAME directory, typically the directory to contain
939 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
940 else if (aux_base_name)
942 const char *aux_base;
944 base_of_path (aux_base_name, &aux_base);
945 if (aux_base_name != aux_base)
947 int dir_len = aux_base - aux_base_name;
948 char *new_dump_base_name =
949 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
951 /* Copy directory component from AUX_BASE_NAME. */
952 memcpy (new_dump_base_name, aux_base_name, dir_len);
953 /* Append existing DUMP_BASE_NAME. */
954 strcpy (new_dump_base_name + dir_len, dump_base_name);
955 dump_base_name = new_dump_base_name;
960 /* Handle related options for unit-at-a-time, toplevel-reorder, and
962 if (!flag_unit_at_a_time)
964 if (flag_section_anchors == 1)
965 error ("Section anchors must be disabled when unit-at-a-time "
967 flag_section_anchors = 0;
968 if (flag_toplevel_reorder == 1)
969 error ("Toplevel reorder must be disabled when unit-at-a-time "
971 flag_toplevel_reorder = 0;
974 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
975 if (warn_missing_noreturn)
976 warn_suggest_attribute_noreturn = true;
978 /* Unless the user has asked for section anchors, we disable toplevel
979 reordering at -O0 to disable transformations that might be surprising
980 to end users and to get -fno-toplevel-reorder tested. */
981 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
983 flag_toplevel_reorder = 0;
984 flag_section_anchors = 0;
986 if (!flag_toplevel_reorder)
988 if (flag_section_anchors == 1)
989 error ("section anchors must be disabled when toplevel reorder"
991 flag_section_anchors = 0;
998 if (flag_pic && !flag_pie)
1000 first_time_p = false;
1005 /* Inlining does not work if not optimizing,
1006 so force it not to be done. */
1011 /* The optimization to partition hot and cold basic blocks into separate
1012 sections of the .o and executable files does not work (currently)
1013 with exception handling. This is because there is no support for
1014 generating unwind info. If flag_exceptions is turned on we need to
1015 turn off the partitioning optimization. */
1017 if (flag_exceptions && flag_reorder_blocks_and_partition
1018 && (USING_SJLJ_EXCEPTIONS
1019 #ifdef TARGET_UNWIND_INFO
1024 inform (input_location,
1025 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1026 flag_reorder_blocks_and_partition = 0;
1027 flag_reorder_blocks = 1;
1030 /* If user requested unwind info, then turn off the partitioning
1033 if (flag_unwind_tables && ! targetm.unwind_tables_default
1034 && flag_reorder_blocks_and_partition
1035 && (USING_SJLJ_EXCEPTIONS
1036 #ifdef TARGET_UNWIND_INFO
1041 inform (input_location,
1042 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1043 flag_reorder_blocks_and_partition = 0;
1044 flag_reorder_blocks = 1;
1047 /* If the target requested unwind info, then turn off the partitioning
1048 optimization with a different message. Likewise, if the target does not
1049 support named sections. */
1051 if (flag_reorder_blocks_and_partition
1052 && (!targetm.have_named_sections
1053 || (flag_unwind_tables && targetm.unwind_tables_default
1054 && (USING_SJLJ_EXCEPTIONS
1055 #ifdef TARGET_UNWIND_INFO
1060 inform (input_location,
1061 "-freorder-blocks-and-partition does not work on this architecture");
1062 flag_reorder_blocks_and_partition = 0;
1063 flag_reorder_blocks = 1;
1066 /* Pipelining of outer loops is only possible when general pipelining
1067 capabilities are requested. */
1068 if (!flag_sel_sched_pipelining)
1069 flag_sel_sched_pipelining_outer_loops = 0;
1071 if (!targetm.ira_cover_classes
1072 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1074 inform (input_location,
1075 "-fira-algorithm=CB does not work on this architecture");
1076 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1079 if (flag_conserve_stack)
1081 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1082 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1083 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1084 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1086 if (flag_wpa || flag_ltrans)
1088 /* These passes are not WHOPR compatible yet. */
1090 flag_ipa_struct_reorg = 0;
1093 if (flag_lto || flag_whopr)
1096 flag_generate_lto = 1;
1098 /* When generating IL, do not operate in whole-program mode.
1099 Otherwise, symbols will be privatized too early, causing link
1101 flag_whole_program = 0;
1103 error ("LTO support has not been enabled in this configuration");
1107 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1108 check option consistency. */
1109 if (flag_lto && flag_whopr)
1110 error ("-flto and -fwhopr are mutually exclusive");
1113 #define LEFT_COLUMN 27
1115 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1116 followed by word-wrapped HELP in a second column. */
1118 wrap_help (const char *help,
1120 unsigned int item_width,
1121 unsigned int columns)
1123 unsigned int col_width = LEFT_COLUMN;
1124 unsigned int remaining, room, len;
1126 remaining = strlen (help);
1130 room = columns - 3 - MAX (col_width, item_width);
1139 for (i = 0; help[i]; i++)
1141 if (i >= room && len != remaining)
1145 else if ((help[i] == '-' || help[i] == '/')
1146 && help[i + 1] != ' '
1147 && i > 0 && ISALPHA (help[i - 1]))
1152 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1154 while (help[len] == ' ')
1162 /* Print help for a specific front-end, etc. */
1164 print_filtered_help (unsigned int include_flags,
1165 unsigned int exclude_flags,
1166 unsigned int any_flags,
1167 unsigned int columns)
1171 static char *printed = NULL;
1173 bool displayed = false;
1175 if (include_flags == CL_PARAMS)
1177 for (i = 0; i < LAST_PARAM; i++)
1179 const char *param = compiler_params[i].option;
1181 help = compiler_params[i].help;
1182 if (help == NULL || *help == '\0')
1184 if (exclude_flags & CL_UNDOCUMENTED)
1186 help = undocumented_msg;
1189 /* Get the translation. */
1192 wrap_help (help, param, strlen (param), columns);
1199 printed = XCNEWVAR (char, cl_options_count);
1201 for (i = 0; i < cl_options_count; i++)
1203 static char new_help[128];
1204 const struct cl_option *option = cl_options + i;
1209 if (include_flags == 0
1210 || ((option->flags & include_flags) != include_flags))
1212 if ((option->flags & any_flags) == 0)
1216 /* Skip unwanted switches. */
1217 if ((option->flags & exclude_flags) != 0)
1221 /* Skip switches that have already been printed. */
1227 help = option->help;
1230 if (exclude_flags & CL_UNDOCUMENTED)
1232 help = undocumented_msg;
1235 /* Get the translation. */
1238 /* Find the gap between the name of the
1239 option and its descriptive text. */
1240 tab = strchr (help, '\t');
1249 opt = option->opt_text;
1253 /* With the -Q option enabled we change the descriptive text associated
1254 with an option to be an indication of its current setting. */
1257 if (len < (LEFT_COLUMN + 2))
1258 strcpy (new_help, "\t\t");
1260 strcpy (new_help, "\t");
1262 if (option->flag_var != NULL)
1264 if (option->flags & CL_JOINED)
1266 if (option->var_type == CLVC_STRING)
1268 if (* (const char **) option->flag_var != NULL)
1269 snprintf (new_help + strlen (new_help),
1270 sizeof (new_help) - strlen (new_help),
1271 * (const char **) option->flag_var);
1274 sprintf (new_help + strlen (new_help),
1275 "%#x", * (int *) option->flag_var);
1278 strcat (new_help, option_enabled (i)
1279 ? _("[enabled]") : _("[disabled]"));
1285 wrap_help (help, opt, len, columns);
1291 unsigned int langs = include_flags & CL_LANG_ALL;
1294 printf (_(" No options with the desired characteristics were found\n"));
1299 /* PR 31349: Tell the user how to see all of the
1300 options supported by a specific front end. */
1301 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1302 if ((1U << i) & langs)
1303 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1304 lang_names[i], lang_names[i]);
1308 else if (! displayed)
1309 printf (_(" All options with the desired characteristics have already been displayed\n"));
1314 /* Display help for a specified type of option.
1315 The options must have ALL of the INCLUDE_FLAGS set
1316 ANY of the flags in the ANY_FLAGS set
1317 and NONE of the EXCLUDE_FLAGS set. */
1319 print_specific_help (unsigned int include_flags,
1320 unsigned int exclude_flags,
1321 unsigned int any_flags)
1323 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1324 const char * description = NULL;
1325 const char * descrip_extra = "";
1328 static unsigned int columns = 0;
1330 /* Sanity check: Make sure that we do not have more
1331 languages than we have bits available to enumerate them. */
1332 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1334 /* If we have not done so already, obtain
1335 the desired maximum width of the output. */
1340 GET_ENVIRONMENT (p, "COLUMNS");
1343 int value = atoi (p);
1350 /* Use a reasonable default. */
1354 /* Decide upon the title for the options that we are going to display. */
1355 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1357 switch (flag & include_flags)
1363 description = _("The following options are target specific");
1366 description = _("The following options control compiler warning messages");
1368 case CL_OPTIMIZATION:
1369 description = _("The following options control optimizations");
1372 description = _("The following options are language-independent");
1375 description = _("The --param option recognizes the following as parameters");
1378 if (i >= cl_lang_count)
1380 if (exclude_flags & all_langs_mask)
1381 description = _("The following options are specific to just the language ");
1383 description = _("The following options are supported by the language ");
1384 descrip_extra = lang_names [i];
1389 if (description == NULL)
1393 if (include_flags & CL_UNDOCUMENTED)
1394 description = _("The following options are not documented");
1395 else if (include_flags & CL_SEPARATE)
1396 description = _("The following options take separate arguments");
1397 else if (include_flags & CL_JOINED)
1398 description = _("The following options take joined arguments");
1401 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1408 if (any_flags & all_langs_mask)
1409 description = _("The following options are language-related");
1411 description = _("The following options are language-independent");
1415 printf ("%s%s:\n", description, descrip_extra);
1416 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1419 /* Handle target- and language-independent options. Return zero to
1420 generate an "unknown option" message. Only options that need
1421 extra handling need to be listed here; if you simply want
1422 VALUE assigned to a variable, it happens automatically. */
1425 common_handle_option (size_t scode, const char *arg, int value,
1426 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED)
1428 static bool verbose = false;
1429 enum opt_code code = (enum opt_code) scode;
1444 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1445 unsigned int undoc_mask;
1448 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1449 /* First display any single language specific options. */
1450 for (i = 0; i < cl_lang_count; i++)
1452 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1453 /* Next display any multi language specific options. */
1454 print_specific_help (0, undoc_mask, all_langs_mask);
1455 /* Then display any remaining, non-language options. */
1456 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1457 print_specific_help (i, undoc_mask, 0);
1458 exit_after_options = true;
1462 case OPT_ftarget_help:
1463 case OPT__target_help:
1464 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1465 exit_after_options = true;
1467 /* Allow the target a chance to give the user some additional information. */
1468 if (targetm.target_help)
1469 targetm.target_help ();
1475 const char * a = arg;
1476 unsigned int include_flags = 0;
1477 /* Note - by default we include undocumented options when listing
1478 specific classes. If you only want to see documented options
1479 then add ",^undocumented" to the --help= option. E.g.:
1481 --help=target,^undocumented */
1482 unsigned int exclude_flags = 0;
1484 /* Walk along the argument string, parsing each word in turn.
1486 arg = [^]{word}[,{arg}]
1487 word = {optimizers|target|warnings|undocumented|
1488 params|common|<language>} */
1493 const char * string;
1498 { "optimizers", CL_OPTIMIZATION },
1499 { "target", CL_TARGET },
1500 { "warnings", CL_WARNING },
1501 { "undocumented", CL_UNDOCUMENTED },
1502 { "params", CL_PARAMS },
1503 { "joined", CL_JOINED },
1504 { "separate", CL_SEPARATE },
1505 { "common", CL_COMMON },
1508 unsigned int * pflags;
1510 unsigned int lang_flag, specific_flag;
1517 pflags = & exclude_flags;
1520 pflags = & include_flags;
1522 comma = strchr (a, ',');
1533 /* Check to see if the string matches an option class name. */
1534 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1535 if (strncasecmp (a, specifics[i].string, len) == 0)
1537 specific_flag = specifics[i].flag;
1541 /* Check to see if the string matches a language name.
1542 Note - we rely upon the alpha-sorted nature of the entries in
1543 the lang_names array, specifically that shorter names appear
1544 before their longer variants. (i.e. C before C++). That way
1545 when we are attempting to match --help=c for example we will
1546 match with C first and not C++. */
1547 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1548 if (strncasecmp (a, lang_names[i], len) == 0)
1550 lang_flag = 1U << i;
1554 if (specific_flag != 0)
1557 * pflags |= specific_flag;
1560 /* The option's argument matches both the start of a
1561 language name and the start of an option class name.
1562 We have a special case for when the user has
1563 specified "--help=c", but otherwise we have to issue
1565 if (strncasecmp (a, "c", len) == 0)
1566 * pflags |= lang_flag;
1569 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1573 else if (lang_flag != 0)
1574 * pflags |= lang_flag;
1577 "warning: unrecognized argument to --help= option: %.*s\n",
1586 print_specific_help (include_flags, exclude_flags, 0);
1587 exit_after_options = true;
1593 exit_after_options = true;
1597 g_switch_value = value;
1598 g_switch_set = true;
1604 /* Currently handled in a prescan. */
1608 enable_warning_as_error (arg, value, lang_mask);
1611 case OPT_Wlarger_than_:
1612 /* This form corresponds to -Wlarger-than-.
1613 Kept for backward compatibility.
1614 Don't use it as the first argument of warning(). */
1616 case OPT_Wlarger_than_eq:
1617 larger_than_size = value;
1618 warn_larger_than = value != -1;
1621 case OPT_Wfatal_errors:
1622 global_dc->fatal_errors = value;
1625 case OPT_Wframe_larger_than_:
1626 frame_larger_than_size = value;
1627 warn_frame_larger_than = value != -1;
1630 case OPT_Wstrict_aliasing:
1631 set_Wstrict_aliasing (value);
1634 case OPT_Wstrict_aliasing_:
1635 warn_strict_aliasing = value;
1638 case OPT_Wstrict_overflow:
1639 warn_strict_overflow = (value
1640 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1644 case OPT_Wstrict_overflow_:
1645 warn_strict_overflow = value;
1648 case OPT_Wsystem_headers:
1649 global_dc->warn_system_headers = value;
1653 warn_unused = value;
1658 aux_info_file_name = arg;
1659 flag_gen_aux_info = 1;
1663 aux_base_name = arg;
1666 case OPT_auxbase_strip:
1668 char *tmp = xstrdup (arg);
1669 strip_off_ending (tmp, strlen (tmp));
1671 aux_base_name = tmp;
1676 decode_d_option (arg);
1680 dump_base_name = arg;
1684 dump_dir_name = arg;
1687 case OPT_falign_functions_:
1688 align_functions = value;
1691 case OPT_falign_jumps_:
1692 align_jumps = value;
1695 case OPT_falign_labels_:
1696 align_labels = value;
1699 case OPT_falign_loops_:
1700 align_loops = value;
1703 case OPT_fbranch_probabilities:
1704 flag_branch_probabilities_set = true;
1707 case OPT_fcall_used_:
1708 fix_register (arg, 0, 1);
1711 case OPT_fcall_saved_:
1712 fix_register (arg, 0, 0);
1716 dbg_cnt_process_opt (arg);
1719 case OPT_fdbg_cnt_list:
1720 dbg_cnt_list_all_counters ();
1723 case OPT_fdebug_prefix_map_:
1724 add_debug_prefix_map (arg);
1727 case OPT_fdiagnostics_show_location_:
1728 if (!strcmp (arg, "once"))
1729 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1730 else if (!strcmp (arg, "every-line"))
1731 diagnostic_prefixing_rule (global_dc)
1732 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1737 case OPT_fdiagnostics_show_option:
1738 global_dc->show_option_requested = value;
1742 if (!dump_switch_p (arg))
1746 case OPT_fexcess_precision_:
1747 if (!strcmp (arg, "fast"))
1748 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1749 else if (!strcmp (arg, "standard"))
1750 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1752 error ("unknown excess precision style \"%s\"", arg);
1755 case OPT_ffast_math:
1756 set_fast_math_flags (value);
1759 case OPT_funsafe_math_optimizations:
1760 set_unsafe_math_optimizations_flags (value);
1764 fix_register (arg, 1, 1);
1767 case OPT_finline_limit_:
1768 case OPT_finline_limit_eq:
1769 set_param_value ("max-inline-insns-single", value / 2);
1770 set_param_value ("max-inline-insns-auto", value / 2);
1773 case OPT_finstrument_functions_exclude_function_list_:
1774 add_comma_separated_to_vector
1775 (&flag_instrument_functions_exclude_functions, arg);
1778 case OPT_finstrument_functions_exclude_file_list_:
1779 add_comma_separated_to_vector
1780 (&flag_instrument_functions_exclude_files, arg);
1783 case OPT_fmessage_length_:
1784 pp_set_line_maximum_length (global_dc->printer, value);
1787 case OPT_fpack_struct_:
1788 if (value <= 0 || (value & (value - 1)) || value > 16)
1789 error ("structure alignment must be a small power of two, not %d", value);
1792 initial_max_fld_align = value;
1793 maximum_field_alignment = value * BITS_PER_UNIT;
1797 case OPT_fpeel_loops:
1798 flag_peel_loops_set = true;
1802 #ifdef ENABLE_PLUGIN
1803 add_new_plugin (arg);
1805 error ("Plugin support is disabled. Configure with --enable-plugin.");
1809 case OPT_fplugin_arg_:
1810 #ifdef ENABLE_PLUGIN
1811 parse_plugin_arg_opt (arg);
1813 error ("Plugin support is disabled. Configure with --enable-plugin.");
1817 case OPT_fprofile_arcs:
1818 profile_arc_flag_set = true;
1821 case OPT_finline_functions:
1822 flag_inline_functions_set = true;
1825 case OPT_fprofile_dir_:
1826 profile_data_prefix = xstrdup (arg);
1829 case OPT_fprofile_use_:
1830 profile_data_prefix = xstrdup (arg);
1831 flag_profile_use = true;
1833 /* No break here - do -fprofile-use processing. */
1834 case OPT_fprofile_use:
1835 if (!flag_branch_probabilities_set)
1836 flag_branch_probabilities = value;
1837 if (!flag_profile_values_set)
1838 flag_profile_values = value;
1839 if (!flag_unroll_loops_set)
1840 flag_unroll_loops = value;
1841 if (!flag_peel_loops_set)
1842 flag_peel_loops = value;
1843 if (!flag_tracer_set)
1844 flag_tracer = value;
1845 if (!flag_value_profile_transformations_set)
1846 flag_value_profile_transformations = value;
1847 if (!flag_inline_functions_set)
1848 flag_inline_functions = value;
1849 if (!flag_ipa_cp_set)
1850 flag_ipa_cp = value;
1851 if (!flag_ipa_cp_clone_set
1852 && value && flag_ipa_cp)
1853 flag_ipa_cp_clone = value;
1854 if (!flag_predictive_commoning_set)
1855 flag_predictive_commoning = value;
1856 if (!flag_unswitch_loops_set)
1857 flag_unswitch_loops = value;
1858 if (!flag_gcse_after_reload_set)
1859 flag_gcse_after_reload = value;
1862 case OPT_fprofile_generate_:
1863 profile_data_prefix = xstrdup (arg);
1865 /* No break here - do -fprofile-generate processing. */
1866 case OPT_fprofile_generate:
1867 if (!profile_arc_flag_set)
1868 profile_arc_flag = value;
1869 if (!flag_profile_values_set)
1870 flag_profile_values = value;
1871 if (!flag_value_profile_transformations_set)
1872 flag_value_profile_transformations = value;
1873 if (!flag_inline_functions_set)
1874 flag_inline_functions = value;
1877 case OPT_fprofile_values:
1878 flag_profile_values_set = true;
1881 case OPT_fshow_column:
1882 global_dc->show_column = value;
1885 case OPT_fvisibility_:
1887 if (!strcmp(arg, "default"))
1888 default_visibility = VISIBILITY_DEFAULT;
1889 else if (!strcmp(arg, "internal"))
1890 default_visibility = VISIBILITY_INTERNAL;
1891 else if (!strcmp(arg, "hidden"))
1892 default_visibility = VISIBILITY_HIDDEN;
1893 else if (!strcmp(arg, "protected"))
1894 default_visibility = VISIBILITY_PROTECTED;
1896 error ("unrecognized visibility value \"%s\"", arg);
1901 flag_value_profile_transformations_set = true;
1904 case OPT_frandom_seed:
1905 /* The real switch is -fno-random-seed. */
1908 set_random_seed (NULL);
1911 case OPT_frandom_seed_:
1912 set_random_seed (arg);
1915 case OPT_fselective_scheduling:
1916 case OPT_fselective_scheduling2:
1917 sel_sched_switch_set = true;
1920 case OPT_fsched_verbose_:
1921 #ifdef INSN_SCHEDULING
1922 fix_sched_param ("verbose", arg);
1928 case OPT_fsched_stalled_insns_:
1929 flag_sched_stalled_insns = value;
1930 if (flag_sched_stalled_insns == 0)
1931 flag_sched_stalled_insns = -1;
1934 case OPT_fsched_stalled_insns_dep_:
1935 flag_sched_stalled_insns_dep = value;
1938 case OPT_fstack_check_:
1939 if (!strcmp (arg, "no"))
1940 flag_stack_check = NO_STACK_CHECK;
1941 else if (!strcmp (arg, "generic"))
1942 /* This is the old stack checking method. */
1943 flag_stack_check = STACK_CHECK_BUILTIN
1944 ? FULL_BUILTIN_STACK_CHECK
1945 : GENERIC_STACK_CHECK;
1946 else if (!strcmp (arg, "specific"))
1947 /* This is the new stack checking method. */
1948 flag_stack_check = STACK_CHECK_BUILTIN
1949 ? FULL_BUILTIN_STACK_CHECK
1950 : STACK_CHECK_STATIC_BUILTIN
1951 ? STATIC_BUILTIN_STACK_CHECK
1952 : GENERIC_STACK_CHECK;
1954 warning (0, "unknown stack check parameter \"%s\"", arg);
1957 case OPT_fstack_check:
1958 /* This is the same as the "specific" mode above. */
1960 flag_stack_check = STACK_CHECK_BUILTIN
1961 ? FULL_BUILTIN_STACK_CHECK
1962 : STACK_CHECK_STATIC_BUILTIN
1963 ? STATIC_BUILTIN_STACK_CHECK
1964 : GENERIC_STACK_CHECK;
1966 flag_stack_check = NO_STACK_CHECK;
1969 case OPT_fstack_limit:
1970 /* The real switch is -fno-stack-limit. */
1973 stack_limit_rtx = NULL_RTX;
1976 case OPT_fstack_limit_register_:
1978 int reg = decode_reg_name (arg);
1980 error ("unrecognized register name \"%s\"", arg);
1982 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1986 case OPT_fstack_limit_symbol_:
1987 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1990 case OPT_ftree_vectorizer_verbose_:
1991 vect_set_verbosity_level (arg);
1994 case OPT_ftls_model_:
1995 if (!strcmp (arg, "global-dynamic"))
1996 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1997 else if (!strcmp (arg, "local-dynamic"))
1998 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1999 else if (!strcmp (arg, "initial-exec"))
2000 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2001 else if (!strcmp (arg, "local-exec"))
2002 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2004 warning (0, "unknown tls-model \"%s\"", arg);
2007 case OPT_fira_algorithm_:
2008 if (!strcmp (arg, "CB"))
2009 flag_ira_algorithm = IRA_ALGORITHM_CB;
2010 else if (!strcmp (arg, "priority"))
2011 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2013 warning (0, "unknown ira algorithm \"%s\"", arg);
2016 case OPT_fira_region_:
2017 if (!strcmp (arg, "one"))
2018 flag_ira_region = IRA_REGION_ONE;
2019 else if (!strcmp (arg, "all"))
2020 flag_ira_region = IRA_REGION_ALL;
2021 else if (!strcmp (arg, "mixed"))
2022 flag_ira_region = IRA_REGION_MIXED;
2024 warning (0, "unknown ira region \"%s\"", arg);
2027 case OPT_fira_verbose_:
2028 flag_ira_verbose = value;
2032 flag_tracer_set = true;
2036 flag_ipa_cp_set = true;
2039 case OPT_fipa_cp_clone:
2040 flag_ipa_cp_clone_set = true;
2043 case OPT_fpredictive_commoning:
2044 flag_predictive_commoning_set = true;
2047 case OPT_funswitch_loops:
2048 flag_unswitch_loops_set = true;
2051 case OPT_fgcse_after_reload:
2052 flag_gcse_after_reload_set = true;
2055 case OPT_funroll_loops:
2056 flag_unroll_loops_set = true;
2060 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2064 set_debug_level (SDB_DEBUG, false, arg);
2068 if (value < 2 || value > 4)
2069 error ("dwarf version %d is not supported", value);
2071 dwarf_version = value;
2072 set_debug_level (DWARF2_DEBUG, false, "");
2076 set_debug_level (NO_DEBUG, 2, arg);
2081 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2085 set_debug_level (VMS_DEBUG, false, arg);
2090 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2094 asm_file_name = arg;
2097 case OPT_pedantic_errors:
2098 flag_pedantic_errors = pedantic = 1;
2099 global_dc->pedantic_errors = 1;
2107 global_dc->inhibit_warnings = true;
2111 case OPT_fcse_skip_blocks:
2112 case OPT_floop_optimize:
2113 case OPT_frerun_loop_opt:
2114 case OPT_fsched2_use_traces:
2115 case OPT_fstrength_reduce:
2116 case OPT_ftree_store_copy_prop:
2117 case OPT_fforce_addr:
2118 case OPT_ftree_salias:
2119 case OPT_ftree_store_ccp:
2120 case OPT_Wunreachable_code:
2121 case OPT_fargument_alias:
2122 case OPT_fargument_noalias:
2123 case OPT_fargument_noalias_anything:
2124 case OPT_fargument_noalias_global:
2125 /* These are no-ops, preserved for backward compatibility. */
2128 case OPT_fuse_linker_plugin:
2129 /* No-op. Used by the driver and passed to us because it starts with f.*/
2133 /* If the flag was handled in a standard way, assume the lack of
2134 processing here is intentional. */
2135 gcc_assert (cl_options[scode].flag_var);
2142 /* Handle --param NAME=VALUE. */
2144 handle_param (const char *carg)
2149 arg = xstrdup (carg);
2150 equal = strchr (arg, '=');
2152 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2155 value = integral_argument (equal + 1);
2157 error ("invalid --param value %qs", equal + 1);
2161 set_param_value (arg, value);
2168 /* Used to set the level of strict aliasing warnings,
2169 when no level is specified (i.e., when -Wstrict-aliasing, and not
2170 -Wstrict-aliasing=level was given).
2171 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2172 and 0 otherwise. After calling this function, wstrict_aliasing will be
2173 set to the default value of -Wstrict_aliasing=level, currently 3. */
2175 set_Wstrict_aliasing (int onoff)
2177 gcc_assert (onoff == 0 || onoff == 1);
2179 warn_strict_aliasing = 3;
2181 warn_strict_aliasing = 0;
2184 /* The following routines are useful in setting all the flags that
2185 -ffast-math and -fno-fast-math imply. */
2187 set_fast_math_flags (int set)
2189 flag_unsafe_math_optimizations = set;
2190 set_unsafe_math_optimizations_flags (set);
2191 flag_finite_math_only = set;
2192 flag_errno_math = !set;
2195 flag_signaling_nans = 0;
2196 flag_rounding_math = 0;
2197 flag_cx_limited_range = 1;
2201 /* When -funsafe-math-optimizations is set the following
2202 flags are set as well. */
2204 set_unsafe_math_optimizations_flags (int set)
2206 flag_trapping_math = !set;
2207 flag_signed_zeros = !set;
2208 flag_associative_math = set;
2209 flag_reciprocal_math = set;
2212 /* Return true iff flags are set as if -ffast-math. */
2214 fast_math_flags_set_p (void)
2216 return (!flag_trapping_math
2217 && flag_unsafe_math_optimizations
2218 && flag_finite_math_only
2219 && !flag_signed_zeros
2220 && !flag_errno_math);
2223 /* Return true iff flags are set as if -ffast-math but using the flags stored
2224 in the struct cl_optimization structure. */
2226 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2228 return (!opt->flag_trapping_math
2229 && opt->flag_unsafe_math_optimizations
2230 && opt->flag_finite_math_only
2231 && !opt->flag_signed_zeros
2232 && !opt->flag_errno_math);
2235 /* Handle a debug output -g switch. EXTENDED is true or false to support
2236 extended output (2 is special and means "-ggdb" was given). */
2238 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2240 static bool type_explicit;
2242 use_gnu_debug_info_extensions = extended;
2244 if (type == NO_DEBUG)
2246 if (write_symbols == NO_DEBUG)
2248 write_symbols = PREFERRED_DEBUGGING_TYPE;
2252 #ifdef DWARF2_DEBUGGING_INFO
2253 write_symbols = DWARF2_DEBUG;
2254 #elif defined DBX_DEBUGGING_INFO
2255 write_symbols = DBX_DEBUG;
2259 if (write_symbols == NO_DEBUG)
2260 warning (0, "target system does not support debug output");
2265 /* Does it conflict with an already selected type? */
2266 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2267 error ("debug format \"%s\" conflicts with prior selection",
2268 debug_type_names[type]);
2269 write_symbols = type;
2270 type_explicit = true;
2273 /* A debug flag without a level defaults to level 2. */
2276 if (!debug_info_level)
2277 debug_info_level = DINFO_LEVEL_NORMAL;
2281 int argval = integral_argument (arg);
2283 error ("unrecognised debug output level \"%s\"", arg);
2284 else if (argval > 3)
2285 error ("debug output level %s is too high", arg);
2287 debug_info_level = (enum debug_info_level) argval;
2291 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2292 a simple on-off switch. */
2295 option_enabled (int opt_idx)
2297 const struct cl_option *option = &(cl_options[opt_idx]);
2299 if (option->flag_var)
2300 switch (option->var_type)
2303 return *(int *) option->flag_var != 0;
2306 return *(int *) option->flag_var == option->var_value;
2308 case CLVC_BIT_CLEAR:
2309 return (*(int *) option->flag_var & option->var_value) == 0;
2312 return (*(int *) option->flag_var & option->var_value) != 0;
2320 /* Fill STATE with the current state of option OPTION. Return true if
2321 there is some state to store. */
2324 get_option_state (int option, struct cl_option_state *state)
2326 if (cl_options[option].flag_var == 0)
2329 switch (cl_options[option].var_type)
2333 state->data = cl_options[option].flag_var;
2334 state->size = sizeof (int);
2337 case CLVC_BIT_CLEAR:
2339 state->ch = option_enabled (option);
2340 state->data = &state->ch;
2345 state->data = *(const char **) cl_options[option].flag_var;
2346 if (state->data == 0)
2348 state->size = strlen ((const char *) state->data) + 1;
2354 /* Set *OPTION according to VALUE and ARG. */
2357 set_option (int opt_index, int value, const char *arg, int kind)
2359 const struct cl_option *option = &cl_options[opt_index];
2361 if (!option->flag_var)
2364 switch (option->var_type)
2367 *(int *) option->flag_var = value;
2371 *(int *) option->flag_var = (value
2373 : !option->var_value);
2376 case CLVC_BIT_CLEAR:
2378 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
2379 *(int *) option->flag_var |= option->var_value;
2381 *(int *) option->flag_var &= ~option->var_value;
2382 if (option->flag_var == &target_flags)
2383 target_flags_explicit |= option->var_value;
2387 *(const char **) option->flag_var = arg;
2391 if ((diagnostic_t)kind != DK_UNSPECIFIED)
2392 diagnostic_classify_diagnostic (global_dc, opt_index, (diagnostic_t)kind);
2396 /* Callback function, called when -Werror= enables a warning. */
2398 static void (*warning_as_error_callback) (int) = NULL;
2400 /* Register a callback for enable_warning_as_error calls. */
2403 register_warning_as_error_callback (void (*callback) (int))
2405 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2406 warning_as_error_callback = callback;
2409 /* Enable a warning option as an error. This is used by -Werror= and
2410 also by legacy Werror-implicit-function-declaration. */
2413 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2418 new_option = XNEWVEC (char, strlen (arg) + 2);
2419 new_option[0] = 'W';
2420 strcpy (new_option + 1, arg);
2421 option_index = find_opt (new_option, lang_mask);
2422 if (option_index == N_OPTS)
2424 error ("-Werror=%s: No option -%s", arg, new_option);
2428 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2430 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2431 if (kind == DK_ERROR)
2433 const struct cl_option * const option = cl_options + option_index;
2435 /* -Werror=foo implies -Wfoo. */
2436 if (option->var_type == CLVC_BOOLEAN)
2437 handle_option (option_index, value, arg, lang_mask, (int)kind);
2439 if (warning_as_error_callback)
2440 warning_as_error_callback (option_index);
2446 /* Return malloced memory for the name of the option OPTION_INDEX
2447 which enabled a diagnostic (context CONTEXT), originally of type
2448 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2452 option_name (diagnostic_context *context, int option_index,
2453 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2457 /* A warning classified as an error. */
2458 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2459 && diag_kind == DK_ERROR)
2460 return concat (cl_options[OPT_Werror_].opt_text,
2461 /* Skip over "-W". */
2462 cl_options[option_index].opt_text + 2,
2464 /* A warning with option. */
2466 return xstrdup (cl_options[option_index].opt_text);
2468 /* A warning without option classified as an error. */
2469 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2470 || diag_kind == DK_WARNING)
2472 if (context->warning_as_error_requested)
2473 return xstrdup (cl_options[OPT_Werror].opt_text);
2475 return xstrdup (_("enabled by default"));