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 bool common_handle_option (const struct cl_decoded_option *decoded,
376 unsigned int lang_mask, int kind,
377 const struct cl_option_handlers *handlers);
378 static void handle_param (const char *);
379 static char *write_langs (unsigned int lang_mask);
380 static void complain_wrong_lang (const struct cl_decoded_option *,
381 unsigned int lang_mask);
382 static void set_debug_level (enum debug_info_type type, int extended,
385 /* Return a malloced slash-separated list of languages in MASK. */
387 write_langs (unsigned int mask)
389 unsigned int n = 0, len = 0;
390 const char *lang_name;
393 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
394 if (mask & (1U << n))
395 len += strlen (lang_name) + 1;
397 result = XNEWVEC (char, len);
399 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
400 if (mask & (1U << n))
404 strcpy (result + len, lang_name);
405 len += strlen (lang_name);
413 /* Complain that switch DECODED does not apply to this front end (mask
416 complain_wrong_lang (const struct cl_decoded_option *decoded,
417 unsigned int lang_mask)
419 const struct cl_option *option = &cl_options[decoded->opt_index];
420 const char *text = decoded->orig_option_with_args_text;
421 char *ok_langs = NULL, *bad_lang = NULL;
422 unsigned int opt_flags = option->flags;
424 if (!lang_hooks.complain_wrong_lang_p (option))
427 opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
428 if (opt_flags != CL_DRIVER)
429 ok_langs = write_langs (opt_flags);
430 if (lang_mask != CL_DRIVER)
431 bad_lang = write_langs (lang_mask);
433 if (opt_flags == CL_DRIVER)
434 error ("command line option %qs is valid for the driver but not for %s",
436 else if (lang_mask == CL_DRIVER)
439 /* Eventually this should become a hard error IMO. */
440 warning (0, "command line option %qs is valid for %s but not for %s",
441 text, ok_langs, bad_lang);
447 /* Buffer the unknown option described by the string OPT. Currently,
448 we only complain about unknown -Wno-* options if they may have
449 prevented a diagnostic. Otherwise, we just ignore them.
450 Note that if we do complain, it is only as a warning, not an error;
451 passing the compiler an unrecognised -Wno-* option should never
452 change whether the compilation succeeds or fails. */
454 static void postpone_unknown_option_warning(const char *opt)
456 VEC_safe_push (const_char_p, heap, ignored_options, opt);
459 /* Produce a warning for each option previously buffered. */
461 void print_ignored_options (void)
463 location_t saved_loc = input_location;
467 while (!VEC_empty (const_char_p, ignored_options))
470 opt = VEC_pop (const_char_p, ignored_options);
471 warning (0, "unrecognized command line option \"%s\"", opt);
474 input_location = saved_loc;
477 /* Handle an unknown option DECODED, returning true if an error should be
481 unknown_option_callback (const struct cl_decoded_option *decoded)
483 const char *opt = decoded->arg;
485 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
487 /* We don't generate warnings for unknown -Wno-* options unless
488 we issue diagnostics. */
489 postpone_unknown_option_warning (opt);
496 /* Note that an option DECODED has been successfully handled with a
497 handler for mask MASK. */
500 post_handling_callback (const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
501 unsigned int mask ATTRIBUTE_UNUSED)
504 lto_register_user_option (decoded->opt_index, decoded->arg,
505 decoded->value, mask);
509 /* Handle a front-end option; arguments and return value as for
513 lang_handle_option (const struct cl_decoded_option *decoded,
514 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
515 const struct cl_option_handlers *handlers)
517 gcc_assert (decoded->canonical_option_num_elements <= 2);
518 return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
519 decoded->value, kind, handlers);
522 /* Handle a back-end option; arguments and return value as for
526 target_handle_option (const struct cl_decoded_option *decoded,
527 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
528 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
530 gcc_assert (decoded->canonical_option_num_elements <= 2);
531 gcc_assert (kind == DK_UNSPECIFIED);
532 return targetm.handle_option (decoded->opt_index, decoded->arg,
536 /* Handle FILENAME from the command line. */
538 add_input_filename (const char *filename)
541 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
542 in_fnames[num_in_fnames - 1] = filename;
545 /* Add comma-separated strings to a char_p vector. */
548 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
555 /* We never free this string. */
568 VEC_safe_push (char_p, heap, *pvec, token_start);
571 if (*r == '\\' && r[1] == ',')
579 if (*token_start != '\0')
580 VEC_safe_push (char_p, heap, *pvec, token_start);
583 /* Return whether we should exclude FNDECL from instrumentation. */
586 flag_instrument_functions_exclude_p (tree fndecl)
588 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
594 name = lang_hooks.decl_printable_name (fndecl, 0);
595 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_functions,
597 if (strstr (name, s) != NULL)
601 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
607 name = DECL_SOURCE_FILE (fndecl);
608 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_files, i, s)
609 if (strstr (name, s) != NULL)
617 /* Handle the vector of command line options. LANG_MASK
618 contains has a single bit set representing the current
619 language. HANDLERS describes what functions to call for the options. */
621 read_cmdline_options (struct cl_decoded_option *decoded_options,
622 unsigned int decoded_options_count,
623 unsigned int lang_mask,
624 const struct cl_option_handlers *handlers)
628 for (i = 1; i < decoded_options_count; i++)
630 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
632 if (main_input_filename == NULL)
634 main_input_filename = decoded_options[i].arg;
635 main_input_baselength
636 = base_of_path (main_input_filename, &main_input_basename);
638 add_input_filename (decoded_options[i].arg);
642 read_cmdline_option (decoded_options + i, lang_mask, handlers);
646 /* Parse command line options and set default flag values. Do minimal
647 options processing. The decoded options are placed in *DECODED_OPTIONS
648 and *DECODED_OPTIONS_COUNT. */
650 decode_options (unsigned int argc, const char **argv,
651 struct cl_decoded_option **decoded_options,
652 unsigned int *decoded_options_count)
654 static bool first_time_p = true;
655 static int initial_min_crossjump_insns;
656 static int initial_max_fields_for_field_sensitive;
657 static int initial_loop_invariant_max_bbs_in_loop;
658 static unsigned int initial_lang_mask;
659 struct cl_option_handlers handlers;
661 unsigned int i, lang_mask;
670 /* Perform language-specific options initialization. */
671 initial_lang_mask = lang_mask = lang_hooks.option_lang_mask ();
673 lang_hooks.initialize_diagnostics (global_dc);
675 /* Save initial values of parameters we reset. */
676 initial_min_crossjump_insns
677 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
678 initial_max_fields_for_field_sensitive
679 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
680 initial_loop_invariant_max_bbs_in_loop
681 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
684 lang_mask = initial_lang_mask;
686 decode_cmdline_options_to_array (argc, argv,
687 lang_mask | CL_COMMON | CL_TARGET,
688 decoded_options, decoded_options_count);
690 /* Perform language-specific options initialization. */
691 lang_hooks.init_options (*decoded_options_count, *decoded_options);
693 handlers.unknown_option_callback = unknown_option_callback;
694 handlers.wrong_lang_callback = complain_wrong_lang;
695 handlers.post_handling_callback = post_handling_callback;
696 handlers.num_handlers = 3;
697 handlers.handlers[0].handler = lang_handle_option;
698 handlers.handlers[0].mask = lang_mask;
699 handlers.handlers[1].handler = common_handle_option;
700 handlers.handlers[1].mask = CL_COMMON;
701 handlers.handlers[2].handler = target_handle_option;
702 handlers.handlers[2].mask = CL_TARGET;
704 /* Scan to see what optimization level has been specified. That will
705 determine the default value of many flags. */
706 for (i = 1; i < *decoded_options_count; i++)
708 struct cl_decoded_option *opt = &(*decoded_options)[i];
709 switch (opt->opt_index)
712 if (*opt->arg == '\0')
720 const int optimize_val = integral_argument (opt->arg);
721 if (optimize_val == -1)
722 error ("argument to %qs should be a non-negative integer",
726 optimize = optimize_val;
727 if ((unsigned int) optimize > 255)
738 /* Optimizing for size forces optimize to be 2. */
744 /* -Ofast only adds flags to -O3. */
751 /* Ignore other options in this prescan. */
756 /* Use priority coloring if cover classes is not defined for the
758 if (targetm.ira_cover_classes == NULL)
759 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
761 /* -O1 optimizations. */
762 opt1 = (optimize >= 1);
763 flag_defer_pop = opt1;
765 flag_delayed_branch = opt1;
767 #ifdef CAN_DEBUG_WITHOUT_FP
768 flag_omit_frame_pointer = opt1;
770 flag_guess_branch_prob = opt1;
771 flag_cprop_registers = opt1;
772 flag_forward_propagate = opt1;
773 flag_if_conversion = opt1;
774 flag_if_conversion2 = opt1;
775 flag_ipa_pure_const = opt1;
776 flag_ipa_reference = opt1;
777 flag_ipa_profile = opt1;
778 flag_merge_constants = opt1;
779 flag_split_wide_types = opt1;
780 flag_tree_ccp = opt1;
781 flag_tree_bit_ccp = opt1;
782 flag_tree_dce = opt1;
783 flag_tree_dom = opt1;
784 flag_tree_dse = opt1;
785 flag_tree_ter = opt1;
786 flag_tree_sra = opt1;
787 flag_tree_copyrename = opt1;
788 flag_tree_fre = opt1;
789 flag_tree_copy_prop = opt1;
790 flag_tree_sink = opt1;
793 /* -O2 optimizations. */
794 opt2 = (optimize >= 2);
795 flag_inline_small_functions = opt2;
796 flag_indirect_inlining = opt2;
797 flag_partial_inlining = opt2;
798 flag_thread_jumps = opt2;
799 flag_crossjumping = opt2;
800 flag_optimize_sibling_calls = opt2;
801 flag_cse_follow_jumps = opt2;
803 flag_expensive_optimizations = opt2;
804 flag_rerun_cse_after_loop = opt2;
805 flag_caller_saves = opt2;
806 flag_peephole2 = opt2;
807 #ifdef INSN_SCHEDULING
808 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
809 flag_schedule_insns = opt2 && ! optimize_size;
810 flag_schedule_insns_after_reload = opt2;
813 flag_strict_aliasing = opt2;
814 flag_strict_overflow = opt2;
815 flag_reorder_blocks = opt2;
816 flag_reorder_functions = opt2;
817 flag_tree_vrp = opt2;
818 flag_tree_builtin_call_dce = opt2;
819 flag_tree_pre = opt2;
820 flag_tree_switch_conversion = opt2;
824 /* Track fields in field-sensitive alias analysis. */
825 set_param_value ("max-fields-for-field-sensitive",
826 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
828 /* For -O1 only do loop invariant motion for very small loops. */
829 set_param_value ("loop-invariant-max-bbs-in-loop",
830 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
832 /* -O3 optimizations. */
833 opt3 = (optimize >= 3);
834 flag_tree_loop_distribute_patterns = opt3;
835 flag_predictive_commoning = opt3;
836 flag_inline_functions = opt3;
837 flag_unswitch_loops = opt3;
838 flag_gcse_after_reload = opt3;
839 flag_tree_vectorize = opt3;
840 flag_ipa_cp_clone = opt3;
841 if (flag_ipa_cp_clone)
844 /* Just -O1/-O0 optimizations. */
845 opt1_max = (optimize <= 1);
846 align_loops = opt1_max;
847 align_jumps = opt1_max;
848 align_labels = opt1_max;
849 align_functions = opt1_max;
853 /* Inlining of functions reducing size is a good idea regardless of them
854 being declared inline. */
855 flag_inline_functions = 1;
857 /* Basic optimization options. */
862 /* We want to crossjump as much as possible. */
863 set_param_value ("min-crossjump-insns", 1);
866 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
868 /* -Ofast adds optimizations to -O3. */
871 /* Which is -ffast-math for now. */
872 set_fast_math_flags (1);
873 /* Allow targets to enable extra options with -Ofast
874 before general options processing so disabling them
875 again afterwards works. */
876 targetm.handle_ofast ();
879 /* Enable -Werror=coverage-mismatch by default */
880 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers);
884 /* Initialize whether `char' is signed. */
885 flag_signed_char = DEFAULT_SIGNED_CHAR;
886 /* Set this to a special "uninitialized" value. The actual default is
887 set after target options have been processed. */
888 flag_short_enums = 2;
890 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
892 target_flags = targetm.default_target_flags;
894 /* Some targets have ABI-specified unwind tables. */
895 flag_unwind_tables = targetm.unwind_tables_default;
899 /* Clear any options currently held for LTO. */
900 lto_clear_user_options ();
903 #ifdef OPTIMIZATION_OPTIONS
904 /* Allow default optimizations to be specified on a per-machine basis. */
905 OPTIMIZATION_OPTIONS (optimize, optimize_size);
908 read_cmdline_options (*decoded_options, *decoded_options_count, lang_mask,
911 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
913 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
914 directory. Then try to make DUMP_BASE_NAME relative to the
915 AUX_BASE_NAME directory, typically the directory to contain
918 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
919 else if (aux_base_name)
921 const char *aux_base;
923 base_of_path (aux_base_name, &aux_base);
924 if (aux_base_name != aux_base)
926 int dir_len = aux_base - aux_base_name;
927 char *new_dump_base_name =
928 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
930 /* Copy directory component from AUX_BASE_NAME. */
931 memcpy (new_dump_base_name, aux_base_name, dir_len);
932 /* Append existing DUMP_BASE_NAME. */
933 strcpy (new_dump_base_name + dir_len, dump_base_name);
934 dump_base_name = new_dump_base_name;
939 /* Handle related options for unit-at-a-time, toplevel-reorder, and
941 if (!flag_unit_at_a_time)
943 if (flag_section_anchors == 1)
944 error ("Section anchors must be disabled when unit-at-a-time "
946 flag_section_anchors = 0;
947 if (flag_toplevel_reorder == 1)
948 error ("Toplevel reorder must be disabled when unit-at-a-time "
950 flag_toplevel_reorder = 0;
953 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
954 if (warn_missing_noreturn)
955 warn_suggest_attribute_noreturn = true;
957 /* Unless the user has asked for section anchors, we disable toplevel
958 reordering at -O0 to disable transformations that might be surprising
959 to end users and to get -fno-toplevel-reorder tested. */
960 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
962 flag_toplevel_reorder = 0;
963 flag_section_anchors = 0;
965 if (!flag_toplevel_reorder)
967 if (flag_section_anchors == 1)
968 error ("section anchors must be disabled when toplevel reorder"
970 flag_section_anchors = 0;
977 if (flag_pic && !flag_pie)
979 first_time_p = false;
984 /* Inlining does not work if not optimizing,
985 so force it not to be done. */
990 /* The optimization to partition hot and cold basic blocks into separate
991 sections of the .o and executable files does not work (currently)
992 with exception handling. This is because there is no support for
993 generating unwind info. If flag_exceptions is turned on we need to
994 turn off the partitioning optimization. */
996 if (flag_exceptions && flag_reorder_blocks_and_partition
997 && (USING_SJLJ_EXCEPTIONS
998 #ifdef TARGET_UNWIND_INFO
1003 inform (input_location,
1004 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
1005 flag_reorder_blocks_and_partition = 0;
1006 flag_reorder_blocks = 1;
1009 /* If user requested unwind info, then turn off the partitioning
1012 if (flag_unwind_tables && ! targetm.unwind_tables_default
1013 && flag_reorder_blocks_and_partition
1014 && (USING_SJLJ_EXCEPTIONS
1015 #ifdef TARGET_UNWIND_INFO
1020 inform (input_location,
1021 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1022 flag_reorder_blocks_and_partition = 0;
1023 flag_reorder_blocks = 1;
1026 /* If the target requested unwind info, then turn off the partitioning
1027 optimization with a different message. Likewise, if the target does not
1028 support named sections. */
1030 if (flag_reorder_blocks_and_partition
1031 && (!targetm.have_named_sections
1032 || (flag_unwind_tables && targetm.unwind_tables_default
1033 && (USING_SJLJ_EXCEPTIONS
1034 #ifdef TARGET_UNWIND_INFO
1039 inform (input_location,
1040 "-freorder-blocks-and-partition does not work on this architecture");
1041 flag_reorder_blocks_and_partition = 0;
1042 flag_reorder_blocks = 1;
1045 /* Pipelining of outer loops is only possible when general pipelining
1046 capabilities are requested. */
1047 if (!flag_sel_sched_pipelining)
1048 flag_sel_sched_pipelining_outer_loops = 0;
1050 if (!targetm.ira_cover_classes
1051 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1053 inform (input_location,
1054 "-fira-algorithm=CB does not work on this architecture");
1055 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1058 if (flag_conserve_stack)
1060 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1061 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1062 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1063 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1065 if (flag_wpa || flag_ltrans)
1067 /* These passes are not WHOPR compatible yet. */
1069 flag_ipa_struct_reorg = 0;
1072 if (flag_lto || flag_whopr)
1075 flag_generate_lto = 1;
1077 /* When generating IL, do not operate in whole-program mode.
1078 Otherwise, symbols will be privatized too early, causing link
1080 flag_whole_program = 0;
1082 error ("LTO support has not been enabled in this configuration");
1086 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1087 check option consistency. */
1088 if (flag_lto && flag_whopr)
1089 error ("-flto and -fwhopr are mutually exclusive");
1092 #define LEFT_COLUMN 27
1094 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1095 followed by word-wrapped HELP in a second column. */
1097 wrap_help (const char *help,
1099 unsigned int item_width,
1100 unsigned int columns)
1102 unsigned int col_width = LEFT_COLUMN;
1103 unsigned int remaining, room, len;
1105 remaining = strlen (help);
1109 room = columns - 3 - MAX (col_width, item_width);
1118 for (i = 0; help[i]; i++)
1120 if (i >= room && len != remaining)
1124 else if ((help[i] == '-' || help[i] == '/')
1125 && help[i + 1] != ' '
1126 && i > 0 && ISALPHA (help[i - 1]))
1131 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1133 while (help[len] == ' ')
1141 /* Print help for a specific front-end, etc. */
1143 print_filtered_help (unsigned int include_flags,
1144 unsigned int exclude_flags,
1145 unsigned int any_flags,
1146 unsigned int columns)
1150 static char *printed = NULL;
1152 bool displayed = false;
1154 if (include_flags == CL_PARAMS)
1156 for (i = 0; i < LAST_PARAM; i++)
1158 const char *param = compiler_params[i].option;
1160 help = compiler_params[i].help;
1161 if (help == NULL || *help == '\0')
1163 if (exclude_flags & CL_UNDOCUMENTED)
1165 help = undocumented_msg;
1168 /* Get the translation. */
1171 wrap_help (help, param, strlen (param), columns);
1178 printed = XCNEWVAR (char, cl_options_count);
1180 for (i = 0; i < cl_options_count; i++)
1182 static char new_help[128];
1183 const struct cl_option *option = cl_options + i;
1188 if (include_flags == 0
1189 || ((option->flags & include_flags) != include_flags))
1191 if ((option->flags & any_flags) == 0)
1195 /* Skip unwanted switches. */
1196 if ((option->flags & exclude_flags) != 0)
1199 /* The driver currently prints its own help text. */
1200 if ((option->flags & CL_DRIVER) != 0
1201 && (option->flags & (((1U << cl_lang_count) - 1)
1202 | CL_COMMON | CL_TARGET)) == 0)
1206 /* Skip switches that have already been printed. */
1212 help = option->help;
1215 if (exclude_flags & CL_UNDOCUMENTED)
1217 help = undocumented_msg;
1220 /* Get the translation. */
1223 /* Find the gap between the name of the
1224 option and its descriptive text. */
1225 tab = strchr (help, '\t');
1234 opt = option->opt_text;
1238 /* With the -Q option enabled we change the descriptive text associated
1239 with an option to be an indication of its current setting. */
1242 if (len < (LEFT_COLUMN + 2))
1243 strcpy (new_help, "\t\t");
1245 strcpy (new_help, "\t");
1247 if (option->flag_var != NULL)
1249 if (option->flags & CL_JOINED)
1251 if (option->var_type == CLVC_STRING)
1253 if (* (const char **) option->flag_var != NULL)
1254 snprintf (new_help + strlen (new_help),
1255 sizeof (new_help) - strlen (new_help),
1256 * (const char **) option->flag_var);
1259 sprintf (new_help + strlen (new_help),
1260 "%#x", * (int *) option->flag_var);
1263 strcat (new_help, option_enabled (i)
1264 ? _("[enabled]") : _("[disabled]"));
1270 wrap_help (help, opt, len, columns);
1276 unsigned int langs = include_flags & CL_LANG_ALL;
1279 printf (_(" No options with the desired characteristics were found\n"));
1284 /* PR 31349: Tell the user how to see all of the
1285 options supported by a specific front end. */
1286 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1287 if ((1U << i) & langs)
1288 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1289 lang_names[i], lang_names[i]);
1293 else if (! displayed)
1294 printf (_(" All options with the desired characteristics have already been displayed\n"));
1299 /* Display help for a specified type of option.
1300 The options must have ALL of the INCLUDE_FLAGS set
1301 ANY of the flags in the ANY_FLAGS set
1302 and NONE of the EXCLUDE_FLAGS set. */
1304 print_specific_help (unsigned int include_flags,
1305 unsigned int exclude_flags,
1306 unsigned int any_flags)
1308 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1309 const char * description = NULL;
1310 const char * descrip_extra = "";
1313 static unsigned int columns = 0;
1315 /* Sanity check: Make sure that we do not have more
1316 languages than we have bits available to enumerate them. */
1317 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1319 /* If we have not done so already, obtain
1320 the desired maximum width of the output. */
1325 GET_ENVIRONMENT (p, "COLUMNS");
1328 int value = atoi (p);
1335 /* Use a reasonable default. */
1339 /* Decide upon the title for the options that we are going to display. */
1340 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1342 switch (flag & include_flags)
1349 description = _("The following options are target specific");
1352 description = _("The following options control compiler warning messages");
1354 case CL_OPTIMIZATION:
1355 description = _("The following options control optimizations");
1358 description = _("The following options are language-independent");
1361 description = _("The --param option recognizes the following as parameters");
1364 if (i >= cl_lang_count)
1366 if (exclude_flags & all_langs_mask)
1367 description = _("The following options are specific to just the language ");
1369 description = _("The following options are supported by the language ");
1370 descrip_extra = lang_names [i];
1375 if (description == NULL)
1379 if (include_flags & CL_UNDOCUMENTED)
1380 description = _("The following options are not documented");
1381 else if (include_flags & CL_SEPARATE)
1382 description = _("The following options take separate arguments");
1383 else if (include_flags & CL_JOINED)
1384 description = _("The following options take joined arguments");
1387 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1394 if (any_flags & all_langs_mask)
1395 description = _("The following options are language-related");
1397 description = _("The following options are language-independent");
1401 printf ("%s%s:\n", description, descrip_extra);
1402 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1405 /* Handle target- and language-independent options. Return zero to
1406 generate an "unknown option" message. Only options that need
1407 extra handling need to be listed here; if you simply want
1408 DECODED->value assigned to a variable, it happens automatically. */
1411 common_handle_option (const struct cl_decoded_option *decoded,
1412 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1413 const struct cl_option_handlers *handlers)
1415 size_t scode = decoded->opt_index;
1416 const char *arg = decoded->arg;
1417 int value = decoded->value;
1418 static bool verbose = false;
1419 enum opt_code code = (enum opt_code) scode;
1421 gcc_assert (decoded->canonical_option_num_elements <= 2);
1436 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1437 unsigned int undoc_mask;
1440 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1441 /* First display any single language specific options. */
1442 for (i = 0; i < cl_lang_count; i++)
1444 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1445 /* Next display any multi language specific options. */
1446 print_specific_help (0, undoc_mask, all_langs_mask);
1447 /* Then display any remaining, non-language options. */
1448 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1450 print_specific_help (i, undoc_mask, 0);
1451 exit_after_options = true;
1455 case OPT_ftarget_help:
1456 case OPT__target_help:
1457 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1458 exit_after_options = true;
1460 /* Allow the target a chance to give the user some additional information. */
1468 const char * a = arg;
1469 unsigned int include_flags = 0;
1470 /* Note - by default we include undocumented options when listing
1471 specific classes. If you only want to see documented options
1472 then add ",^undocumented" to the --help= option. E.g.:
1474 --help=target,^undocumented */
1475 unsigned int exclude_flags = 0;
1477 /* Walk along the argument string, parsing each word in turn.
1479 arg = [^]{word}[,{arg}]
1480 word = {optimizers|target|warnings|undocumented|
1481 params|common|<language>} */
1486 const char * string;
1491 { "optimizers", CL_OPTIMIZATION },
1492 { "target", CL_TARGET },
1493 { "warnings", CL_WARNING },
1494 { "undocumented", CL_UNDOCUMENTED },
1495 { "params", CL_PARAMS },
1496 { "joined", CL_JOINED },
1497 { "separate", CL_SEPARATE },
1498 { "common", CL_COMMON },
1501 unsigned int * pflags;
1503 unsigned int lang_flag, specific_flag;
1510 pflags = & exclude_flags;
1513 pflags = & include_flags;
1515 comma = strchr (a, ',');
1526 /* Check to see if the string matches an option class name. */
1527 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1528 if (strncasecmp (a, specifics[i].string, len) == 0)
1530 specific_flag = specifics[i].flag;
1534 /* Check to see if the string matches a language name.
1535 Note - we rely upon the alpha-sorted nature of the entries in
1536 the lang_names array, specifically that shorter names appear
1537 before their longer variants. (i.e. C before C++). That way
1538 when we are attempting to match --help=c for example we will
1539 match with C first and not C++. */
1540 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1541 if (strncasecmp (a, lang_names[i], len) == 0)
1543 lang_flag = 1U << i;
1547 if (specific_flag != 0)
1550 * pflags |= specific_flag;
1553 /* The option's argument matches both the start of a
1554 language name and the start of an option class name.
1555 We have a special case for when the user has
1556 specified "--help=c", but otherwise we have to issue
1558 if (strncasecmp (a, "c", len) == 0)
1559 * pflags |= lang_flag;
1562 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1566 else if (lang_flag != 0)
1567 * pflags |= lang_flag;
1570 "warning: unrecognized argument to --help= option: %.*s\n",
1579 print_specific_help (include_flags, exclude_flags, 0);
1580 exit_after_options = true;
1586 exit_after_options = true;
1592 /* Currently handled in a prescan. */
1596 enable_warning_as_error (arg, value, lang_mask, handlers);
1599 case OPT_Wlarger_than_:
1600 /* This form corresponds to -Wlarger-than-.
1601 Kept for backward compatibility.
1602 Don't use it as the first argument of warning(). */
1604 case OPT_Wlarger_than_eq:
1605 larger_than_size = value;
1606 warn_larger_than = value != -1;
1609 case OPT_Wfatal_errors:
1610 global_dc->fatal_errors = value;
1613 case OPT_Wframe_larger_than_:
1614 frame_larger_than_size = value;
1615 warn_frame_larger_than = value != -1;
1618 case OPT_Wstrict_aliasing:
1619 set_Wstrict_aliasing (value);
1622 case OPT_Wstrict_aliasing_:
1623 warn_strict_aliasing = value;
1626 case OPT_Wstrict_overflow:
1627 warn_strict_overflow = (value
1628 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1632 case OPT_Wstrict_overflow_:
1633 warn_strict_overflow = value;
1636 case OPT_Wsystem_headers:
1637 global_dc->warn_system_headers = value;
1641 warn_unused = value;
1646 aux_info_file_name = arg;
1647 flag_gen_aux_info = 1;
1651 aux_base_name = arg;
1654 case OPT_auxbase_strip:
1656 char *tmp = xstrdup (arg);
1657 strip_off_ending (tmp, strlen (tmp));
1659 aux_base_name = tmp;
1664 decode_d_option (arg);
1668 dump_base_name = arg;
1672 dump_dir_name = arg;
1675 case OPT_falign_functions_:
1676 align_functions = value;
1679 case OPT_falign_jumps_:
1680 align_jumps = value;
1683 case OPT_falign_labels_:
1684 align_labels = value;
1687 case OPT_falign_loops_:
1688 align_loops = value;
1691 case OPT_fbranch_probabilities:
1692 flag_branch_probabilities_set = true;
1695 case OPT_fcall_used_:
1696 fix_register (arg, 0, 1);
1699 case OPT_fcall_saved_:
1700 fix_register (arg, 0, 0);
1704 dbg_cnt_process_opt (arg);
1707 case OPT_fdbg_cnt_list:
1708 dbg_cnt_list_all_counters ();
1711 case OPT_fdebug_prefix_map_:
1712 add_debug_prefix_map (arg);
1715 case OPT_fdiagnostics_show_location_:
1716 if (!strcmp (arg, "once"))
1717 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1718 else if (!strcmp (arg, "every-line"))
1719 diagnostic_prefixing_rule (global_dc)
1720 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1725 case OPT_fdiagnostics_show_option:
1726 global_dc->show_option_requested = value;
1730 if (!dump_switch_p (arg))
1734 case OPT_fexcess_precision_:
1735 if (!strcmp (arg, "fast"))
1736 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1737 else if (!strcmp (arg, "standard"))
1738 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1740 error ("unknown excess precision style \"%s\"", arg);
1743 case OPT_ffast_math:
1744 set_fast_math_flags (value);
1747 case OPT_funsafe_math_optimizations:
1748 set_unsafe_math_optimizations_flags (value);
1752 fix_register (arg, 1, 1);
1755 case OPT_finline_limit_:
1756 case OPT_finline_limit_eq:
1757 set_param_value ("max-inline-insns-single", value / 2);
1758 set_param_value ("max-inline-insns-auto", value / 2);
1761 case OPT_finstrument_functions_exclude_function_list_:
1762 add_comma_separated_to_vector
1763 (&flag_instrument_functions_exclude_functions, arg);
1766 case OPT_finstrument_functions_exclude_file_list_:
1767 add_comma_separated_to_vector
1768 (&flag_instrument_functions_exclude_files, arg);
1771 case OPT_fmessage_length_:
1772 pp_set_line_maximum_length (global_dc->printer, value);
1775 case OPT_fpack_struct_:
1776 if (value <= 0 || (value & (value - 1)) || value > 16)
1777 error ("structure alignment must be a small power of two, not %d", value);
1780 initial_max_fld_align = value;
1781 maximum_field_alignment = value * BITS_PER_UNIT;
1785 case OPT_fpeel_loops:
1786 flag_peel_loops_set = true;
1790 #ifdef ENABLE_PLUGIN
1791 add_new_plugin (arg);
1793 error ("Plugin support is disabled. Configure with --enable-plugin.");
1797 case OPT_fplugin_arg_:
1798 #ifdef ENABLE_PLUGIN
1799 parse_plugin_arg_opt (arg);
1801 error ("Plugin support is disabled. Configure with --enable-plugin.");
1805 case OPT_fprofile_arcs:
1806 profile_arc_flag_set = true;
1809 case OPT_finline_functions:
1810 flag_inline_functions_set = true;
1813 case OPT_fprofile_dir_:
1814 profile_data_prefix = xstrdup (arg);
1817 case OPT_fprofile_use_:
1818 profile_data_prefix = xstrdup (arg);
1819 flag_profile_use = true;
1821 /* No break here - do -fprofile-use processing. */
1822 case OPT_fprofile_use:
1823 if (!flag_branch_probabilities_set)
1824 flag_branch_probabilities = value;
1825 if (!flag_profile_values_set)
1826 flag_profile_values = value;
1827 if (!flag_unroll_loops_set)
1828 flag_unroll_loops = value;
1829 if (!flag_peel_loops_set)
1830 flag_peel_loops = value;
1831 if (!flag_tracer_set)
1832 flag_tracer = value;
1833 if (!flag_value_profile_transformations_set)
1834 flag_value_profile_transformations = value;
1835 if (!flag_inline_functions_set)
1836 flag_inline_functions = value;
1837 if (!flag_ipa_cp_set)
1838 flag_ipa_cp = value;
1839 if (!flag_ipa_cp_clone_set
1840 && value && flag_ipa_cp)
1841 flag_ipa_cp_clone = value;
1842 if (!flag_predictive_commoning_set)
1843 flag_predictive_commoning = value;
1844 if (!flag_unswitch_loops_set)
1845 flag_unswitch_loops = value;
1846 if (!flag_gcse_after_reload_set)
1847 flag_gcse_after_reload = value;
1850 case OPT_fprofile_generate_:
1851 profile_data_prefix = xstrdup (arg);
1853 /* No break here - do -fprofile-generate processing. */
1854 case OPT_fprofile_generate:
1855 if (!profile_arc_flag_set)
1856 profile_arc_flag = value;
1857 if (!flag_profile_values_set)
1858 flag_profile_values = value;
1859 if (!flag_value_profile_transformations_set)
1860 flag_value_profile_transformations = value;
1861 if (!flag_inline_functions_set)
1862 flag_inline_functions = value;
1865 case OPT_fprofile_values:
1866 flag_profile_values_set = true;
1869 case OPT_fshow_column:
1870 global_dc->show_column = value;
1873 case OPT_fvisibility_:
1875 if (!strcmp(arg, "default"))
1876 default_visibility = VISIBILITY_DEFAULT;
1877 else if (!strcmp(arg, "internal"))
1878 default_visibility = VISIBILITY_INTERNAL;
1879 else if (!strcmp(arg, "hidden"))
1880 default_visibility = VISIBILITY_HIDDEN;
1881 else if (!strcmp(arg, "protected"))
1882 default_visibility = VISIBILITY_PROTECTED;
1884 error ("unrecognized visibility value \"%s\"", arg);
1889 flag_value_profile_transformations_set = true;
1892 case OPT_frandom_seed:
1893 /* The real switch is -fno-random-seed. */
1896 set_random_seed (NULL);
1899 case OPT_frandom_seed_:
1900 set_random_seed (arg);
1903 case OPT_fselective_scheduling:
1904 case OPT_fselective_scheduling2:
1905 sel_sched_switch_set = true;
1908 case OPT_fsched_verbose_:
1909 #ifdef INSN_SCHEDULING
1910 fix_sched_param ("verbose", arg);
1916 case OPT_fsched_stalled_insns_:
1917 flag_sched_stalled_insns = value;
1918 if (flag_sched_stalled_insns == 0)
1919 flag_sched_stalled_insns = -1;
1922 case OPT_fsched_stalled_insns_dep_:
1923 flag_sched_stalled_insns_dep = value;
1926 case OPT_fstack_check_:
1927 if (!strcmp (arg, "no"))
1928 flag_stack_check = NO_STACK_CHECK;
1929 else if (!strcmp (arg, "generic"))
1930 /* This is the old stack checking method. */
1931 flag_stack_check = STACK_CHECK_BUILTIN
1932 ? FULL_BUILTIN_STACK_CHECK
1933 : GENERIC_STACK_CHECK;
1934 else if (!strcmp (arg, "specific"))
1935 /* This is the new stack checking method. */
1936 flag_stack_check = STACK_CHECK_BUILTIN
1937 ? FULL_BUILTIN_STACK_CHECK
1938 : STACK_CHECK_STATIC_BUILTIN
1939 ? STATIC_BUILTIN_STACK_CHECK
1940 : GENERIC_STACK_CHECK;
1942 warning (0, "unknown stack check parameter \"%s\"", arg);
1945 case OPT_fstack_check:
1946 /* This is the same as the "specific" mode above. */
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 flag_stack_check = NO_STACK_CHECK;
1957 case OPT_fstack_limit:
1958 /* The real switch is -fno-stack-limit. */
1961 stack_limit_rtx = NULL_RTX;
1964 case OPT_fstack_limit_register_:
1966 int reg = decode_reg_name (arg);
1968 error ("unrecognized register name \"%s\"", arg);
1970 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1974 case OPT_fstack_limit_symbol_:
1975 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1978 case OPT_ftree_vectorizer_verbose_:
1979 vect_set_verbosity_level (arg);
1982 case OPT_ftls_model_:
1983 if (!strcmp (arg, "global-dynamic"))
1984 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1985 else if (!strcmp (arg, "local-dynamic"))
1986 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1987 else if (!strcmp (arg, "initial-exec"))
1988 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1989 else if (!strcmp (arg, "local-exec"))
1990 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1992 warning (0, "unknown tls-model \"%s\"", arg);
1995 case OPT_fira_algorithm_:
1996 if (!strcmp (arg, "CB"))
1997 flag_ira_algorithm = IRA_ALGORITHM_CB;
1998 else if (!strcmp (arg, "priority"))
1999 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2001 warning (0, "unknown ira algorithm \"%s\"", arg);
2004 case OPT_fira_region_:
2005 if (!strcmp (arg, "one"))
2006 flag_ira_region = IRA_REGION_ONE;
2007 else if (!strcmp (arg, "all"))
2008 flag_ira_region = IRA_REGION_ALL;
2009 else if (!strcmp (arg, "mixed"))
2010 flag_ira_region = IRA_REGION_MIXED;
2012 warning (0, "unknown ira region \"%s\"", arg);
2015 case OPT_fira_verbose_:
2016 flag_ira_verbose = value;
2020 flag_tracer_set = true;
2024 flag_ipa_cp_set = true;
2027 case OPT_fipa_cp_clone:
2028 flag_ipa_cp_clone_set = true;
2031 case OPT_fpredictive_commoning:
2032 flag_predictive_commoning_set = true;
2035 case OPT_funswitch_loops:
2036 flag_unswitch_loops_set = true;
2039 case OPT_fgcse_after_reload:
2040 flag_gcse_after_reload_set = true;
2043 case OPT_funroll_loops:
2044 flag_unroll_loops_set = true;
2048 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2052 set_debug_level (SDB_DEBUG, false, arg);
2056 if (value < 2 || value > 4)
2057 error ("dwarf version %d is not supported", value);
2059 dwarf_version = value;
2060 set_debug_level (DWARF2_DEBUG, false, "");
2064 set_debug_level (NO_DEBUG, 2, arg);
2069 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2073 set_debug_level (VMS_DEBUG, false, arg);
2078 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2082 asm_file_name = arg;
2085 case OPT_pedantic_errors:
2086 flag_pedantic_errors = pedantic = 1;
2087 global_dc->pedantic_errors = 1;
2095 global_dc->inhibit_warnings = true;
2099 case OPT_fcse_skip_blocks:
2100 case OPT_floop_optimize:
2101 case OPT_frerun_loop_opt:
2102 case OPT_fsched2_use_traces:
2103 case OPT_fstrength_reduce:
2104 case OPT_ftree_store_copy_prop:
2105 case OPT_fforce_addr:
2106 case OPT_ftree_salias:
2107 case OPT_ftree_store_ccp:
2108 case OPT_Wunreachable_code:
2109 case OPT_fargument_alias:
2110 case OPT_fargument_noalias:
2111 case OPT_fargument_noalias_anything:
2112 case OPT_fargument_noalias_global:
2113 /* These are no-ops, preserved for backward compatibility. */
2116 case OPT_fuse_linker_plugin:
2117 /* No-op. Used by the driver and passed to us because it starts with f.*/
2121 /* If the flag was handled in a standard way, assume the lack of
2122 processing here is intentional. */
2123 gcc_assert (cl_options[scode].flag_var);
2130 /* Handle --param NAME=VALUE. */
2132 handle_param (const char *carg)
2137 arg = xstrdup (carg);
2138 equal = strchr (arg, '=');
2140 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2143 value = integral_argument (equal + 1);
2145 error ("invalid --param value %qs", equal + 1);
2149 set_param_value (arg, value);
2156 /* Used to set the level of strict aliasing warnings,
2157 when no level is specified (i.e., when -Wstrict-aliasing, and not
2158 -Wstrict-aliasing=level was given).
2159 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2160 and 0 otherwise. After calling this function, wstrict_aliasing will be
2161 set to the default value of -Wstrict_aliasing=level, currently 3. */
2163 set_Wstrict_aliasing (int onoff)
2165 gcc_assert (onoff == 0 || onoff == 1);
2167 warn_strict_aliasing = 3;
2169 warn_strict_aliasing = 0;
2172 /* The following routines are useful in setting all the flags that
2173 -ffast-math and -fno-fast-math imply. */
2175 set_fast_math_flags (int set)
2177 flag_unsafe_math_optimizations = set;
2178 set_unsafe_math_optimizations_flags (set);
2179 flag_finite_math_only = set;
2180 flag_errno_math = !set;
2183 flag_signaling_nans = 0;
2184 flag_rounding_math = 0;
2185 flag_cx_limited_range = 1;
2189 /* When -funsafe-math-optimizations is set the following
2190 flags are set as well. */
2192 set_unsafe_math_optimizations_flags (int set)
2194 flag_trapping_math = !set;
2195 flag_signed_zeros = !set;
2196 flag_associative_math = set;
2197 flag_reciprocal_math = set;
2200 /* Return true iff flags are set as if -ffast-math. */
2202 fast_math_flags_set_p (void)
2204 return (!flag_trapping_math
2205 && flag_unsafe_math_optimizations
2206 && flag_finite_math_only
2207 && !flag_signed_zeros
2208 && !flag_errno_math);
2211 /* Return true iff flags are set as if -ffast-math but using the flags stored
2212 in the struct cl_optimization structure. */
2214 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2216 return (!opt->flag_trapping_math
2217 && opt->flag_unsafe_math_optimizations
2218 && opt->flag_finite_math_only
2219 && !opt->flag_signed_zeros
2220 && !opt->flag_errno_math);
2223 /* Handle a debug output -g switch. EXTENDED is true or false to support
2224 extended output (2 is special and means "-ggdb" was given). */
2226 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2228 static bool type_explicit;
2230 use_gnu_debug_info_extensions = extended;
2232 if (type == NO_DEBUG)
2234 if (write_symbols == NO_DEBUG)
2236 write_symbols = PREFERRED_DEBUGGING_TYPE;
2240 #ifdef DWARF2_DEBUGGING_INFO
2241 write_symbols = DWARF2_DEBUG;
2242 #elif defined DBX_DEBUGGING_INFO
2243 write_symbols = DBX_DEBUG;
2247 if (write_symbols == NO_DEBUG)
2248 warning (0, "target system does not support debug output");
2253 /* Does it conflict with an already selected type? */
2254 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2255 error ("debug format \"%s\" conflicts with prior selection",
2256 debug_type_names[type]);
2257 write_symbols = type;
2258 type_explicit = true;
2261 /* A debug flag without a level defaults to level 2. */
2264 if (!debug_info_level)
2265 debug_info_level = DINFO_LEVEL_NORMAL;
2269 int argval = integral_argument (arg);
2271 error ("unrecognised debug output level \"%s\"", arg);
2272 else if (argval > 3)
2273 error ("debug output level %s is too high", arg);
2275 debug_info_level = (enum debug_info_level) argval;
2279 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2280 a simple on-off switch. */
2283 option_enabled (int opt_idx)
2285 const struct cl_option *option = &(cl_options[opt_idx]);
2287 if (option->flag_var)
2288 switch (option->var_type)
2291 return *(int *) option->flag_var != 0;
2294 return *(int *) option->flag_var == option->var_value;
2296 case CLVC_BIT_CLEAR:
2297 return (*(int *) option->flag_var & option->var_value) == 0;
2300 return (*(int *) option->flag_var & option->var_value) != 0;
2308 /* Fill STATE with the current state of option OPTION. Return true if
2309 there is some state to store. */
2312 get_option_state (int option, struct cl_option_state *state)
2314 if (cl_options[option].flag_var == 0)
2317 switch (cl_options[option].var_type)
2321 state->data = cl_options[option].flag_var;
2322 state->size = sizeof (int);
2325 case CLVC_BIT_CLEAR:
2327 state->ch = option_enabled (option);
2328 state->data = &state->ch;
2333 state->data = *(const char **) cl_options[option].flag_var;
2334 if (state->data == 0)
2336 state->size = strlen ((const char *) state->data) + 1;
2342 /* Callback function, called when -Werror= enables a warning. */
2344 static void (*warning_as_error_callback) (int) = NULL;
2346 /* Register a callback for enable_warning_as_error calls. */
2349 register_warning_as_error_callback (void (*callback) (int))
2351 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2352 warning_as_error_callback = callback;
2355 /* Enable a warning option as an error. This is used by -Werror= and
2356 also by legacy Werror-implicit-function-declaration. */
2359 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2360 const struct cl_option_handlers *handlers)
2365 new_option = XNEWVEC (char, strlen (arg) + 2);
2366 new_option[0] = 'W';
2367 strcpy (new_option + 1, arg);
2368 option_index = find_opt (new_option, lang_mask);
2369 if (option_index == OPT_SPECIAL_unknown)
2371 error ("-Werror=%s: No option -%s", arg, new_option);
2375 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2377 diagnostic_classify_diagnostic (global_dc, option_index, kind,
2379 if (kind == DK_ERROR)
2381 const struct cl_option * const option = cl_options + option_index;
2383 /* -Werror=foo implies -Wfoo. */
2384 if (option->var_type == CLVC_BOOLEAN)
2385 handle_generated_option (option_index, NULL, value, lang_mask,
2386 (int)kind, handlers);
2388 if (warning_as_error_callback)
2389 warning_as_error_callback (option_index);
2395 /* Return malloced memory for the name of the option OPTION_INDEX
2396 which enabled a diagnostic (context CONTEXT), originally of type
2397 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2401 option_name (diagnostic_context *context, int option_index,
2402 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2406 /* A warning classified as an error. */
2407 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2408 && diag_kind == DK_ERROR)
2409 return concat (cl_options[OPT_Werror_].opt_text,
2410 /* Skip over "-W". */
2411 cl_options[option_index].opt_text + 2,
2413 /* A warning with option. */
2415 return xstrdup (cl_options[option_index].opt_text);
2417 /* A warning without option classified as an error. */
2418 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2419 || diag_kind == DK_WARNING)
2421 if (context->warning_as_error_requested)
2422 return xstrdup (cl_options[OPT_Werror].opt_text);
2424 return xstrdup (_("enabled by default"));