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 (size_t scode, const char *arg, int value,
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 char *, const struct cl_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 OPT_INDEX does not apply to this front end. */
415 complain_wrong_lang (const char *text, const struct cl_option *option,
416 unsigned int lang_mask)
418 char *ok_langs, *bad_lang;
420 if (!lang_hooks.complain_wrong_lang_p (option))
423 ok_langs = write_langs (option->flags);
424 bad_lang = write_langs (lang_mask);
426 /* Eventually this should become a hard error IMO. */
427 warning (0, "command line option \"%s\" is valid for %s but not for %s",
428 text, ok_langs, bad_lang);
434 /* Buffer the unknown option described by the string OPT. Currently,
435 we only complain about unknown -Wno-* options if they may have
436 prevented a diagnostic. Otherwise, we just ignore them.
437 Note that if we do complain, it is only as a warning, not an error;
438 passing the compiler an unrecognised -Wno-* option should never
439 change whether the compilation succeeds or fails. */
441 static void postpone_unknown_option_warning(const char *opt)
443 VEC_safe_push (const_char_p, heap, ignored_options, opt);
446 /* Produce a warning for each option previously buffered. */
448 void print_ignored_options (void)
450 location_t saved_loc = input_location;
454 while (!VEC_empty (const_char_p, ignored_options))
457 opt = VEC_pop (const_char_p, ignored_options);
458 warning (0, "unrecognized command line option \"%s\"", opt);
461 input_location = saved_loc;
464 /* Handle an unknown option ARG, returning true if an error should be
468 unknown_option_callback (const char *opt)
470 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
472 /* We don't generate warnings for unknown -Wno-* options unless
473 we issue diagnostics. */
474 postpone_unknown_option_warning (opt);
481 /* Note that an option (index OPT_INDEX, argument ARG, value VALUE)
482 has been successfully handled with a handler for mask MASK. */
485 post_handling_callback (size_t opt_index ATTRIBUTE_UNUSED,
486 const char *arg ATTRIBUTE_UNUSED,
487 int value ATTRIBUTE_UNUSED,
488 unsigned int mask ATTRIBUTE_UNUSED)
491 lto_register_user_option (opt_index, arg, value, mask);
495 /* Handle a front-end option; arguments and return value as for
499 lang_handle_option (size_t opt_index, const char *arg, int value,
500 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
501 const struct cl_option_handlers *handlers)
503 return lang_hooks.handle_option (opt_index, arg, value, kind, handlers);
506 /* Handle a back-end option; arguments and return value as for
510 target_handle_option (size_t opt_index, const char *arg, int value,
511 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
512 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
514 gcc_assert (kind == DK_UNSPECIFIED);
515 return targetm.handle_option (opt_index, arg, value);
518 /* Handle FILENAME from the command line. */
520 add_input_filename (const char *filename)
523 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
524 in_fnames[num_in_fnames - 1] = filename;
527 /* Add comma-separated strings to a char_p vector. */
530 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
537 /* We never free this string. */
550 VEC_safe_push (char_p, heap, *pvec, token_start);
553 if (*r == '\\' && r[1] == ',')
561 if (*token_start != '\0')
562 VEC_safe_push (char_p, heap, *pvec, token_start);
565 /* Return whether we should exclude FNDECL from instrumentation. */
568 flag_instrument_functions_exclude_p (tree fndecl)
570 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
576 name = lang_hooks.decl_printable_name (fndecl, 0);
578 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
582 if (strstr (name, s) != NULL)
587 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
593 name = DECL_SOURCE_FILE (fndecl);
595 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
598 if (strstr (name, s) != NULL)
607 /* Handle the vector of command line options. LANG_MASK
608 contains has a single bit set representing the current
609 language. HANDLERS describes what functions to call for the options. */
611 read_cmdline_options (struct cl_decoded_option *decoded_options,
612 unsigned int decoded_options_count,
613 unsigned int lang_mask,
614 const struct cl_option_handlers *handlers)
618 for (i = 1; i < decoded_options_count; i++)
620 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
622 if (main_input_filename == NULL)
624 main_input_filename = decoded_options[i].arg;
625 main_input_baselength
626 = base_of_path (main_input_filename, &main_input_basename);
628 add_input_filename (decoded_options[i].arg);
632 read_cmdline_option (decoded_options + i, lang_mask, handlers);
636 /* Parse command line options and set default flag values. Do minimal
637 options processing. The decoded options are placed in *DECODED_OPTIONS
638 and *DECODED_OPTIONS_COUNT. */
640 decode_options (unsigned int argc, const char **argv,
641 struct cl_decoded_option **decoded_options,
642 unsigned int *decoded_options_count)
644 static bool first_time_p = true;
645 static int initial_min_crossjump_insns;
646 static int initial_max_fields_for_field_sensitive;
647 static int initial_loop_invariant_max_bbs_in_loop;
648 static unsigned int initial_lang_mask;
649 struct cl_option_handlers handlers;
651 unsigned int i, lang_mask;
660 /* Perform language-specific options initialization. */
661 initial_lang_mask = lang_mask = lang_hooks.option_lang_mask ();
663 lang_hooks.initialize_diagnostics (global_dc);
665 /* Save initial values of parameters we reset. */
666 initial_min_crossjump_insns
667 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
668 initial_max_fields_for_field_sensitive
669 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
670 initial_loop_invariant_max_bbs_in_loop
671 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
674 lang_mask = initial_lang_mask;
676 decode_cmdline_options_to_array (argc, argv, lang_mask,
677 decoded_options, decoded_options_count);
679 /* Perform language-specific options initialization. */
680 lang_hooks.init_options (*decoded_options_count, *decoded_options);
682 handlers.unknown_option_callback = unknown_option_callback;
683 handlers.wrong_lang_callback = complain_wrong_lang;
684 handlers.post_handling_callback = post_handling_callback;
685 handlers.num_handlers = 3;
686 handlers.handlers[0].handler = lang_handle_option;
687 handlers.handlers[0].mask = lang_mask;
688 handlers.handlers[1].handler = common_handle_option;
689 handlers.handlers[1].mask = CL_COMMON;
690 handlers.handlers[2].handler = target_handle_option;
691 handlers.handlers[2].mask = CL_TARGET;
693 /* Scan to see what optimization level has been specified. That will
694 determine the default value of many flags. */
695 for (i = 1; i < *decoded_options_count; i++)
697 struct cl_decoded_option *opt = &(*decoded_options)[i];
698 switch (opt->opt_index)
701 if (*opt->arg == '\0')
709 const int optimize_val = integral_argument (opt->arg);
710 if (optimize_val == -1)
711 error ("argument to %qs should be a non-negative integer",
715 optimize = optimize_val;
716 if ((unsigned int) optimize > 255)
727 /* Optimizing for size forces optimize to be 2. */
733 /* -Ofast only adds flags to -O3. */
740 /* Ignore other options in this prescan. */
745 /* Use priority coloring if cover classes is not defined for the
747 if (targetm.ira_cover_classes == NULL)
748 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
750 /* -O1 optimizations. */
751 opt1 = (optimize >= 1);
752 flag_defer_pop = opt1;
754 flag_delayed_branch = opt1;
756 #ifdef CAN_DEBUG_WITHOUT_FP
757 flag_omit_frame_pointer = opt1;
759 flag_guess_branch_prob = opt1;
760 flag_cprop_registers = opt1;
761 flag_forward_propagate = opt1;
762 flag_if_conversion = opt1;
763 flag_if_conversion2 = opt1;
764 flag_ipa_pure_const = opt1;
765 flag_ipa_reference = opt1;
766 flag_ipa_profile = opt1;
767 flag_merge_constants = opt1;
768 flag_split_wide_types = opt1;
769 flag_tree_ccp = opt1;
770 flag_tree_dce = opt1;
771 flag_tree_dom = opt1;
772 flag_tree_dse = opt1;
773 flag_tree_ter = opt1;
774 flag_tree_sra = opt1;
775 flag_tree_copyrename = opt1;
776 flag_tree_fre = opt1;
777 flag_tree_copy_prop = opt1;
778 flag_tree_sink = opt1;
781 /* -O2 optimizations. */
782 opt2 = (optimize >= 2);
783 flag_inline_small_functions = opt2;
784 flag_indirect_inlining = opt2;
785 flag_partial_inlining = opt2;
786 flag_thread_jumps = opt2;
787 flag_crossjumping = opt2;
788 flag_optimize_sibling_calls = opt2;
789 flag_cse_follow_jumps = opt2;
791 flag_expensive_optimizations = opt2;
792 flag_rerun_cse_after_loop = opt2;
793 flag_caller_saves = opt2;
794 flag_peephole2 = opt2;
795 #ifdef INSN_SCHEDULING
796 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
797 flag_schedule_insns = opt2 && ! optimize_size;
798 flag_schedule_insns_after_reload = opt2;
801 flag_strict_aliasing = opt2;
802 flag_strict_overflow = opt2;
803 flag_reorder_blocks = opt2;
804 flag_reorder_functions = opt2;
805 flag_tree_vrp = opt2;
806 flag_tree_builtin_call_dce = opt2;
807 flag_tree_pre = opt2;
808 flag_tree_switch_conversion = opt2;
812 /* Track fields in field-sensitive alias analysis. */
813 set_param_value ("max-fields-for-field-sensitive",
814 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
816 /* For -O1 only do loop invariant motion for very small loops. */
817 set_param_value ("loop-invariant-max-bbs-in-loop",
818 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
820 /* -O3 optimizations. */
821 opt3 = (optimize >= 3);
822 flag_predictive_commoning = opt3;
823 flag_inline_functions = opt3;
824 flag_unswitch_loops = opt3;
825 flag_gcse_after_reload = opt3;
826 flag_tree_vectorize = opt3;
827 flag_ipa_cp_clone = opt3;
828 if (flag_ipa_cp_clone)
831 /* Just -O1/-O0 optimizations. */
832 opt1_max = (optimize <= 1);
833 align_loops = opt1_max;
834 align_jumps = opt1_max;
835 align_labels = opt1_max;
836 align_functions = opt1_max;
840 /* Inlining of functions reducing size is a good idea regardless of them
841 being declared inline. */
842 flag_inline_functions = 1;
844 /* Basic optimization options. */
849 /* We want to crossjump as much as possible. */
850 set_param_value ("min-crossjump-insns", 1);
853 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
855 /* -Ofast adds optimizations to -O3. */
858 /* Which is -ffast-math for now. */
859 set_fast_math_flags (1);
860 /* Allow targets to enable extra options with -Ofast
861 before general options processing so disabling them
862 again afterwards works. */
863 targetm.handle_ofast ();
866 /* Enable -Werror=coverage-mismatch by default */
867 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers);
871 /* Initialize whether `char' is signed. */
872 flag_signed_char = DEFAULT_SIGNED_CHAR;
873 /* Set this to a special "uninitialized" value. The actual default is
874 set after target options have been processed. */
875 flag_short_enums = 2;
877 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
879 target_flags = targetm.default_target_flags;
881 /* Some targets have ABI-specified unwind tables. */
882 flag_unwind_tables = targetm.unwind_tables_default;
886 /* Clear any options currently held for LTO. */
887 lto_clear_user_options ();
890 #ifdef OPTIMIZATION_OPTIONS
891 /* Allow default optimizations to be specified on a per-machine basis. */
892 OPTIMIZATION_OPTIONS (optimize, optimize_size);
895 read_cmdline_options (*decoded_options, *decoded_options_count, lang_mask,
898 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
900 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
901 directory. Then try to make DUMP_BASE_NAME relative to the
902 AUX_BASE_NAME directory, typically the directory to contain
905 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
906 else if (aux_base_name)
908 const char *aux_base;
910 base_of_path (aux_base_name, &aux_base);
911 if (aux_base_name != aux_base)
913 int dir_len = aux_base - aux_base_name;
914 char *new_dump_base_name =
915 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
917 /* Copy directory component from AUX_BASE_NAME. */
918 memcpy (new_dump_base_name, aux_base_name, dir_len);
919 /* Append existing DUMP_BASE_NAME. */
920 strcpy (new_dump_base_name + dir_len, dump_base_name);
921 dump_base_name = new_dump_base_name;
926 /* Handle related options for unit-at-a-time, toplevel-reorder, and
928 if (!flag_unit_at_a_time)
930 if (flag_section_anchors == 1)
931 error ("Section anchors must be disabled when unit-at-a-time "
933 flag_section_anchors = 0;
934 if (flag_toplevel_reorder == 1)
935 error ("Toplevel reorder must be disabled when unit-at-a-time "
937 flag_toplevel_reorder = 0;
940 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
941 if (warn_missing_noreturn)
942 warn_suggest_attribute_noreturn = true;
944 /* Unless the user has asked for section anchors, we disable toplevel
945 reordering at -O0 to disable transformations that might be surprising
946 to end users and to get -fno-toplevel-reorder tested. */
947 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
949 flag_toplevel_reorder = 0;
950 flag_section_anchors = 0;
952 if (!flag_toplevel_reorder)
954 if (flag_section_anchors == 1)
955 error ("section anchors must be disabled when toplevel reorder"
957 flag_section_anchors = 0;
964 if (flag_pic && !flag_pie)
966 first_time_p = false;
971 /* Inlining does not work if not optimizing,
972 so force it not to be done. */
977 /* The optimization to partition hot and cold basic blocks into separate
978 sections of the .o and executable files does not work (currently)
979 with exception handling. This is because there is no support for
980 generating unwind info. If flag_exceptions is turned on we need to
981 turn off the partitioning optimization. */
983 if (flag_exceptions && flag_reorder_blocks_and_partition
984 && (USING_SJLJ_EXCEPTIONS
985 #ifdef TARGET_UNWIND_INFO
990 inform (input_location,
991 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
992 flag_reorder_blocks_and_partition = 0;
993 flag_reorder_blocks = 1;
996 /* If user requested unwind info, then turn off the partitioning
999 if (flag_unwind_tables && ! targetm.unwind_tables_default
1000 && flag_reorder_blocks_and_partition
1001 && (USING_SJLJ_EXCEPTIONS
1002 #ifdef TARGET_UNWIND_INFO
1007 inform (input_location,
1008 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1009 flag_reorder_blocks_and_partition = 0;
1010 flag_reorder_blocks = 1;
1013 /* If the target requested unwind info, then turn off the partitioning
1014 optimization with a different message. Likewise, if the target does not
1015 support named sections. */
1017 if (flag_reorder_blocks_and_partition
1018 && (!targetm.have_named_sections
1019 || (flag_unwind_tables && targetm.unwind_tables_default
1020 && (USING_SJLJ_EXCEPTIONS
1021 #ifdef TARGET_UNWIND_INFO
1026 inform (input_location,
1027 "-freorder-blocks-and-partition does not work on this architecture");
1028 flag_reorder_blocks_and_partition = 0;
1029 flag_reorder_blocks = 1;
1032 /* Pipelining of outer loops is only possible when general pipelining
1033 capabilities are requested. */
1034 if (!flag_sel_sched_pipelining)
1035 flag_sel_sched_pipelining_outer_loops = 0;
1037 if (!targetm.ira_cover_classes
1038 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1040 inform (input_location,
1041 "-fira-algorithm=CB does not work on this architecture");
1042 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1045 if (flag_conserve_stack)
1047 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1048 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1049 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1050 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1052 if (flag_wpa || flag_ltrans)
1054 /* These passes are not WHOPR compatible yet. */
1056 flag_ipa_struct_reorg = 0;
1059 if (flag_lto || flag_whopr)
1062 flag_generate_lto = 1;
1064 /* When generating IL, do not operate in whole-program mode.
1065 Otherwise, symbols will be privatized too early, causing link
1067 flag_whole_program = 0;
1069 error ("LTO support has not been enabled in this configuration");
1073 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1074 check option consistency. */
1075 if (flag_lto && flag_whopr)
1076 error ("-flto and -fwhopr are mutually exclusive");
1079 #define LEFT_COLUMN 27
1081 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1082 followed by word-wrapped HELP in a second column. */
1084 wrap_help (const char *help,
1086 unsigned int item_width,
1087 unsigned int columns)
1089 unsigned int col_width = LEFT_COLUMN;
1090 unsigned int remaining, room, len;
1092 remaining = strlen (help);
1096 room = columns - 3 - MAX (col_width, item_width);
1105 for (i = 0; help[i]; i++)
1107 if (i >= room && len != remaining)
1111 else if ((help[i] == '-' || help[i] == '/')
1112 && help[i + 1] != ' '
1113 && i > 0 && ISALPHA (help[i - 1]))
1118 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1120 while (help[len] == ' ')
1128 /* Print help for a specific front-end, etc. */
1130 print_filtered_help (unsigned int include_flags,
1131 unsigned int exclude_flags,
1132 unsigned int any_flags,
1133 unsigned int columns)
1137 static char *printed = NULL;
1139 bool displayed = false;
1141 if (include_flags == CL_PARAMS)
1143 for (i = 0; i < LAST_PARAM; i++)
1145 const char *param = compiler_params[i].option;
1147 help = compiler_params[i].help;
1148 if (help == NULL || *help == '\0')
1150 if (exclude_flags & CL_UNDOCUMENTED)
1152 help = undocumented_msg;
1155 /* Get the translation. */
1158 wrap_help (help, param, strlen (param), columns);
1165 printed = XCNEWVAR (char, cl_options_count);
1167 for (i = 0; i < cl_options_count; i++)
1169 static char new_help[128];
1170 const struct cl_option *option = cl_options + i;
1175 if (include_flags == 0
1176 || ((option->flags & include_flags) != include_flags))
1178 if ((option->flags & any_flags) == 0)
1182 /* Skip unwanted switches. */
1183 if ((option->flags & exclude_flags) != 0)
1187 /* Skip switches that have already been printed. */
1193 help = option->help;
1196 if (exclude_flags & CL_UNDOCUMENTED)
1198 help = undocumented_msg;
1201 /* Get the translation. */
1204 /* Find the gap between the name of the
1205 option and its descriptive text. */
1206 tab = strchr (help, '\t');
1215 opt = option->opt_text;
1219 /* With the -Q option enabled we change the descriptive text associated
1220 with an option to be an indication of its current setting. */
1223 if (len < (LEFT_COLUMN + 2))
1224 strcpy (new_help, "\t\t");
1226 strcpy (new_help, "\t");
1228 if (option->flag_var != NULL)
1230 if (option->flags & CL_JOINED)
1232 if (option->var_type == CLVC_STRING)
1234 if (* (const char **) option->flag_var != NULL)
1235 snprintf (new_help + strlen (new_help),
1236 sizeof (new_help) - strlen (new_help),
1237 * (const char **) option->flag_var);
1240 sprintf (new_help + strlen (new_help),
1241 "%#x", * (int *) option->flag_var);
1244 strcat (new_help, option_enabled (i)
1245 ? _("[enabled]") : _("[disabled]"));
1251 wrap_help (help, opt, len, columns);
1257 unsigned int langs = include_flags & CL_LANG_ALL;
1260 printf (_(" No options with the desired characteristics were found\n"));
1265 /* PR 31349: Tell the user how to see all of the
1266 options supported by a specific front end. */
1267 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1268 if ((1U << i) & langs)
1269 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1270 lang_names[i], lang_names[i]);
1274 else if (! displayed)
1275 printf (_(" All options with the desired characteristics have already been displayed\n"));
1280 /* Display help for a specified type of option.
1281 The options must have ALL of the INCLUDE_FLAGS set
1282 ANY of the flags in the ANY_FLAGS set
1283 and NONE of the EXCLUDE_FLAGS set. */
1285 print_specific_help (unsigned int include_flags,
1286 unsigned int exclude_flags,
1287 unsigned int any_flags)
1289 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1290 const char * description = NULL;
1291 const char * descrip_extra = "";
1294 static unsigned int columns = 0;
1296 /* Sanity check: Make sure that we do not have more
1297 languages than we have bits available to enumerate them. */
1298 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1300 /* If we have not done so already, obtain
1301 the desired maximum width of the output. */
1306 GET_ENVIRONMENT (p, "COLUMNS");
1309 int value = atoi (p);
1316 /* Use a reasonable default. */
1320 /* Decide upon the title for the options that we are going to display. */
1321 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1323 switch (flag & include_flags)
1329 description = _("The following options are target specific");
1332 description = _("The following options control compiler warning messages");
1334 case CL_OPTIMIZATION:
1335 description = _("The following options control optimizations");
1338 description = _("The following options are language-independent");
1341 description = _("The --param option recognizes the following as parameters");
1344 if (i >= cl_lang_count)
1346 if (exclude_flags & all_langs_mask)
1347 description = _("The following options are specific to just the language ");
1349 description = _("The following options are supported by the language ");
1350 descrip_extra = lang_names [i];
1355 if (description == NULL)
1359 if (include_flags & CL_UNDOCUMENTED)
1360 description = _("The following options are not documented");
1361 else if (include_flags & CL_SEPARATE)
1362 description = _("The following options take separate arguments");
1363 else if (include_flags & CL_JOINED)
1364 description = _("The following options take joined arguments");
1367 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1374 if (any_flags & all_langs_mask)
1375 description = _("The following options are language-related");
1377 description = _("The following options are language-independent");
1381 printf ("%s%s:\n", description, descrip_extra);
1382 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1385 /* Handle target- and language-independent options. Return zero to
1386 generate an "unknown option" message. Only options that need
1387 extra handling need to be listed here; if you simply want
1388 VALUE assigned to a variable, it happens automatically. */
1391 common_handle_option (size_t scode, const char *arg, int value,
1392 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1393 const struct cl_option_handlers *handlers)
1395 static bool verbose = false;
1396 enum opt_code code = (enum opt_code) scode;
1411 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1412 unsigned int undoc_mask;
1415 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1416 /* First display any single language specific options. */
1417 for (i = 0; i < cl_lang_count; i++)
1419 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1420 /* Next display any multi language specific options. */
1421 print_specific_help (0, undoc_mask, all_langs_mask);
1422 /* Then display any remaining, non-language options. */
1423 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1424 print_specific_help (i, undoc_mask, 0);
1425 exit_after_options = true;
1429 case OPT_ftarget_help:
1430 case OPT__target_help:
1431 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1432 exit_after_options = true;
1434 /* Allow the target a chance to give the user some additional information. */
1442 const char * a = arg;
1443 unsigned int include_flags = 0;
1444 /* Note - by default we include undocumented options when listing
1445 specific classes. If you only want to see documented options
1446 then add ",^undocumented" to the --help= option. E.g.:
1448 --help=target,^undocumented */
1449 unsigned int exclude_flags = 0;
1451 /* Walk along the argument string, parsing each word in turn.
1453 arg = [^]{word}[,{arg}]
1454 word = {optimizers|target|warnings|undocumented|
1455 params|common|<language>} */
1460 const char * string;
1465 { "optimizers", CL_OPTIMIZATION },
1466 { "target", CL_TARGET },
1467 { "warnings", CL_WARNING },
1468 { "undocumented", CL_UNDOCUMENTED },
1469 { "params", CL_PARAMS },
1470 { "joined", CL_JOINED },
1471 { "separate", CL_SEPARATE },
1472 { "common", CL_COMMON },
1475 unsigned int * pflags;
1477 unsigned int lang_flag, specific_flag;
1484 pflags = & exclude_flags;
1487 pflags = & include_flags;
1489 comma = strchr (a, ',');
1500 /* Check to see if the string matches an option class name. */
1501 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1502 if (strncasecmp (a, specifics[i].string, len) == 0)
1504 specific_flag = specifics[i].flag;
1508 /* Check to see if the string matches a language name.
1509 Note - we rely upon the alpha-sorted nature of the entries in
1510 the lang_names array, specifically that shorter names appear
1511 before their longer variants. (i.e. C before C++). That way
1512 when we are attempting to match --help=c for example we will
1513 match with C first and not C++. */
1514 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1515 if (strncasecmp (a, lang_names[i], len) == 0)
1517 lang_flag = 1U << i;
1521 if (specific_flag != 0)
1524 * pflags |= specific_flag;
1527 /* The option's argument matches both the start of a
1528 language name and the start of an option class name.
1529 We have a special case for when the user has
1530 specified "--help=c", but otherwise we have to issue
1532 if (strncasecmp (a, "c", len) == 0)
1533 * pflags |= lang_flag;
1536 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1540 else if (lang_flag != 0)
1541 * pflags |= lang_flag;
1544 "warning: unrecognized argument to --help= option: %.*s\n",
1553 print_specific_help (include_flags, exclude_flags, 0);
1554 exit_after_options = true;
1560 exit_after_options = true;
1566 /* Currently handled in a prescan. */
1570 enable_warning_as_error (arg, value, lang_mask, handlers);
1573 case OPT_Wlarger_than_:
1574 /* This form corresponds to -Wlarger-than-.
1575 Kept for backward compatibility.
1576 Don't use it as the first argument of warning(). */
1578 case OPT_Wlarger_than_eq:
1579 larger_than_size = value;
1580 warn_larger_than = value != -1;
1583 case OPT_Wfatal_errors:
1584 global_dc->fatal_errors = value;
1587 case OPT_Wframe_larger_than_:
1588 frame_larger_than_size = value;
1589 warn_frame_larger_than = value != -1;
1592 case OPT_Wstrict_aliasing:
1593 set_Wstrict_aliasing (value);
1596 case OPT_Wstrict_aliasing_:
1597 warn_strict_aliasing = value;
1600 case OPT_Wstrict_overflow:
1601 warn_strict_overflow = (value
1602 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1606 case OPT_Wstrict_overflow_:
1607 warn_strict_overflow = value;
1610 case OPT_Wsystem_headers:
1611 global_dc->warn_system_headers = value;
1615 warn_unused = value;
1620 aux_info_file_name = arg;
1621 flag_gen_aux_info = 1;
1625 aux_base_name = arg;
1628 case OPT_auxbase_strip:
1630 char *tmp = xstrdup (arg);
1631 strip_off_ending (tmp, strlen (tmp));
1633 aux_base_name = tmp;
1638 decode_d_option (arg);
1642 dump_base_name = arg;
1646 dump_dir_name = arg;
1649 case OPT_falign_functions_:
1650 align_functions = value;
1653 case OPT_falign_jumps_:
1654 align_jumps = value;
1657 case OPT_falign_labels_:
1658 align_labels = value;
1661 case OPT_falign_loops_:
1662 align_loops = value;
1665 case OPT_fbranch_probabilities:
1666 flag_branch_probabilities_set = true;
1669 case OPT_fcall_used_:
1670 fix_register (arg, 0, 1);
1673 case OPT_fcall_saved_:
1674 fix_register (arg, 0, 0);
1678 dbg_cnt_process_opt (arg);
1681 case OPT_fdbg_cnt_list:
1682 dbg_cnt_list_all_counters ();
1685 case OPT_fdebug_prefix_map_:
1686 add_debug_prefix_map (arg);
1689 case OPT_fdiagnostics_show_location_:
1690 if (!strcmp (arg, "once"))
1691 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1692 else if (!strcmp (arg, "every-line"))
1693 diagnostic_prefixing_rule (global_dc)
1694 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1699 case OPT_fdiagnostics_show_option:
1700 global_dc->show_option_requested = value;
1704 if (!dump_switch_p (arg))
1708 case OPT_fexcess_precision_:
1709 if (!strcmp (arg, "fast"))
1710 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1711 else if (!strcmp (arg, "standard"))
1712 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1714 error ("unknown excess precision style \"%s\"", arg);
1717 case OPT_ffast_math:
1718 set_fast_math_flags (value);
1721 case OPT_funsafe_math_optimizations:
1722 set_unsafe_math_optimizations_flags (value);
1726 fix_register (arg, 1, 1);
1729 case OPT_finline_limit_:
1730 case OPT_finline_limit_eq:
1731 set_param_value ("max-inline-insns-single", value / 2);
1732 set_param_value ("max-inline-insns-auto", value / 2);
1735 case OPT_finstrument_functions_exclude_function_list_:
1736 add_comma_separated_to_vector
1737 (&flag_instrument_functions_exclude_functions, arg);
1740 case OPT_finstrument_functions_exclude_file_list_:
1741 add_comma_separated_to_vector
1742 (&flag_instrument_functions_exclude_files, arg);
1745 case OPT_fmessage_length_:
1746 pp_set_line_maximum_length (global_dc->printer, value);
1749 case OPT_fpack_struct_:
1750 if (value <= 0 || (value & (value - 1)) || value > 16)
1751 error ("structure alignment must be a small power of two, not %d", value);
1754 initial_max_fld_align = value;
1755 maximum_field_alignment = value * BITS_PER_UNIT;
1759 case OPT_fpeel_loops:
1760 flag_peel_loops_set = true;
1764 #ifdef ENABLE_PLUGIN
1765 add_new_plugin (arg);
1767 error ("Plugin support is disabled. Configure with --enable-plugin.");
1771 case OPT_fplugin_arg_:
1772 #ifdef ENABLE_PLUGIN
1773 parse_plugin_arg_opt (arg);
1775 error ("Plugin support is disabled. Configure with --enable-plugin.");
1779 case OPT_fprofile_arcs:
1780 profile_arc_flag_set = true;
1783 case OPT_finline_functions:
1784 flag_inline_functions_set = true;
1787 case OPT_fprofile_dir_:
1788 profile_data_prefix = xstrdup (arg);
1791 case OPT_fprofile_use_:
1792 profile_data_prefix = xstrdup (arg);
1793 flag_profile_use = true;
1795 /* No break here - do -fprofile-use processing. */
1796 case OPT_fprofile_use:
1797 if (!flag_branch_probabilities_set)
1798 flag_branch_probabilities = value;
1799 if (!flag_profile_values_set)
1800 flag_profile_values = value;
1801 if (!flag_unroll_loops_set)
1802 flag_unroll_loops = value;
1803 if (!flag_peel_loops_set)
1804 flag_peel_loops = value;
1805 if (!flag_tracer_set)
1806 flag_tracer = value;
1807 if (!flag_value_profile_transformations_set)
1808 flag_value_profile_transformations = value;
1809 if (!flag_inline_functions_set)
1810 flag_inline_functions = value;
1811 if (!flag_ipa_cp_set)
1812 flag_ipa_cp = value;
1813 if (!flag_ipa_cp_clone_set
1814 && value && flag_ipa_cp)
1815 flag_ipa_cp_clone = value;
1816 if (!flag_predictive_commoning_set)
1817 flag_predictive_commoning = value;
1818 if (!flag_unswitch_loops_set)
1819 flag_unswitch_loops = value;
1820 if (!flag_gcse_after_reload_set)
1821 flag_gcse_after_reload = value;
1824 case OPT_fprofile_generate_:
1825 profile_data_prefix = xstrdup (arg);
1827 /* No break here - do -fprofile-generate processing. */
1828 case OPT_fprofile_generate:
1829 if (!profile_arc_flag_set)
1830 profile_arc_flag = value;
1831 if (!flag_profile_values_set)
1832 flag_profile_values = 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;
1839 case OPT_fprofile_values:
1840 flag_profile_values_set = true;
1843 case OPT_fshow_column:
1844 global_dc->show_column = value;
1847 case OPT_fvisibility_:
1849 if (!strcmp(arg, "default"))
1850 default_visibility = VISIBILITY_DEFAULT;
1851 else if (!strcmp(arg, "internal"))
1852 default_visibility = VISIBILITY_INTERNAL;
1853 else if (!strcmp(arg, "hidden"))
1854 default_visibility = VISIBILITY_HIDDEN;
1855 else if (!strcmp(arg, "protected"))
1856 default_visibility = VISIBILITY_PROTECTED;
1858 error ("unrecognized visibility value \"%s\"", arg);
1863 flag_value_profile_transformations_set = true;
1866 case OPT_frandom_seed:
1867 /* The real switch is -fno-random-seed. */
1870 set_random_seed (NULL);
1873 case OPT_frandom_seed_:
1874 set_random_seed (arg);
1877 case OPT_fselective_scheduling:
1878 case OPT_fselective_scheduling2:
1879 sel_sched_switch_set = true;
1882 case OPT_fsched_verbose_:
1883 #ifdef INSN_SCHEDULING
1884 fix_sched_param ("verbose", arg);
1890 case OPT_fsched_stalled_insns_:
1891 flag_sched_stalled_insns = value;
1892 if (flag_sched_stalled_insns == 0)
1893 flag_sched_stalled_insns = -1;
1896 case OPT_fsched_stalled_insns_dep_:
1897 flag_sched_stalled_insns_dep = value;
1900 case OPT_fstack_check_:
1901 if (!strcmp (arg, "no"))
1902 flag_stack_check = NO_STACK_CHECK;
1903 else if (!strcmp (arg, "generic"))
1904 /* This is the old stack checking method. */
1905 flag_stack_check = STACK_CHECK_BUILTIN
1906 ? FULL_BUILTIN_STACK_CHECK
1907 : GENERIC_STACK_CHECK;
1908 else if (!strcmp (arg, "specific"))
1909 /* This is the new stack checking method. */
1910 flag_stack_check = STACK_CHECK_BUILTIN
1911 ? FULL_BUILTIN_STACK_CHECK
1912 : STACK_CHECK_STATIC_BUILTIN
1913 ? STATIC_BUILTIN_STACK_CHECK
1914 : GENERIC_STACK_CHECK;
1916 warning (0, "unknown stack check parameter \"%s\"", arg);
1919 case OPT_fstack_check:
1920 /* This is the same as the "specific" mode above. */
1922 flag_stack_check = STACK_CHECK_BUILTIN
1923 ? FULL_BUILTIN_STACK_CHECK
1924 : STACK_CHECK_STATIC_BUILTIN
1925 ? STATIC_BUILTIN_STACK_CHECK
1926 : GENERIC_STACK_CHECK;
1928 flag_stack_check = NO_STACK_CHECK;
1931 case OPT_fstack_limit:
1932 /* The real switch is -fno-stack-limit. */
1935 stack_limit_rtx = NULL_RTX;
1938 case OPT_fstack_limit_register_:
1940 int reg = decode_reg_name (arg);
1942 error ("unrecognized register name \"%s\"", arg);
1944 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1948 case OPT_fstack_limit_symbol_:
1949 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1952 case OPT_ftree_vectorizer_verbose_:
1953 vect_set_verbosity_level (arg);
1956 case OPT_ftls_model_:
1957 if (!strcmp (arg, "global-dynamic"))
1958 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1959 else if (!strcmp (arg, "local-dynamic"))
1960 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1961 else if (!strcmp (arg, "initial-exec"))
1962 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1963 else if (!strcmp (arg, "local-exec"))
1964 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1966 warning (0, "unknown tls-model \"%s\"", arg);
1969 case OPT_fira_algorithm_:
1970 if (!strcmp (arg, "CB"))
1971 flag_ira_algorithm = IRA_ALGORITHM_CB;
1972 else if (!strcmp (arg, "priority"))
1973 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1975 warning (0, "unknown ira algorithm \"%s\"", arg);
1978 case OPT_fira_region_:
1979 if (!strcmp (arg, "one"))
1980 flag_ira_region = IRA_REGION_ONE;
1981 else if (!strcmp (arg, "all"))
1982 flag_ira_region = IRA_REGION_ALL;
1983 else if (!strcmp (arg, "mixed"))
1984 flag_ira_region = IRA_REGION_MIXED;
1986 warning (0, "unknown ira region \"%s\"", arg);
1989 case OPT_fira_verbose_:
1990 flag_ira_verbose = value;
1994 flag_tracer_set = true;
1998 flag_ipa_cp_set = true;
2001 case OPT_fipa_cp_clone:
2002 flag_ipa_cp_clone_set = true;
2005 case OPT_fpredictive_commoning:
2006 flag_predictive_commoning_set = true;
2009 case OPT_funswitch_loops:
2010 flag_unswitch_loops_set = true;
2013 case OPT_fgcse_after_reload:
2014 flag_gcse_after_reload_set = true;
2017 case OPT_funroll_loops:
2018 flag_unroll_loops_set = true;
2022 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2026 set_debug_level (SDB_DEBUG, false, arg);
2030 if (value < 2 || value > 4)
2031 error ("dwarf version %d is not supported", value);
2033 dwarf_version = value;
2034 set_debug_level (DWARF2_DEBUG, false, "");
2038 set_debug_level (NO_DEBUG, 2, arg);
2043 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2047 set_debug_level (VMS_DEBUG, false, arg);
2052 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2056 asm_file_name = arg;
2059 case OPT_pedantic_errors:
2060 flag_pedantic_errors = pedantic = 1;
2061 global_dc->pedantic_errors = 1;
2069 global_dc->inhibit_warnings = true;
2073 case OPT_fcse_skip_blocks:
2074 case OPT_floop_optimize:
2075 case OPT_frerun_loop_opt:
2076 case OPT_fsched2_use_traces:
2077 case OPT_fstrength_reduce:
2078 case OPT_ftree_store_copy_prop:
2079 case OPT_fforce_addr:
2080 case OPT_ftree_salias:
2081 case OPT_ftree_store_ccp:
2082 case OPT_Wunreachable_code:
2083 case OPT_fargument_alias:
2084 case OPT_fargument_noalias:
2085 case OPT_fargument_noalias_anything:
2086 case OPT_fargument_noalias_global:
2087 /* These are no-ops, preserved for backward compatibility. */
2090 case OPT_fuse_linker_plugin:
2091 /* No-op. Used by the driver and passed to us because it starts with f.*/
2095 /* If the flag was handled in a standard way, assume the lack of
2096 processing here is intentional. */
2097 gcc_assert (cl_options[scode].flag_var);
2104 /* Handle --param NAME=VALUE. */
2106 handle_param (const char *carg)
2111 arg = xstrdup (carg);
2112 equal = strchr (arg, '=');
2114 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2117 value = integral_argument (equal + 1);
2119 error ("invalid --param value %qs", equal + 1);
2123 set_param_value (arg, value);
2130 /* Used to set the level of strict aliasing warnings,
2131 when no level is specified (i.e., when -Wstrict-aliasing, and not
2132 -Wstrict-aliasing=level was given).
2133 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2134 and 0 otherwise. After calling this function, wstrict_aliasing will be
2135 set to the default value of -Wstrict_aliasing=level, currently 3. */
2137 set_Wstrict_aliasing (int onoff)
2139 gcc_assert (onoff == 0 || onoff == 1);
2141 warn_strict_aliasing = 3;
2143 warn_strict_aliasing = 0;
2146 /* The following routines are useful in setting all the flags that
2147 -ffast-math and -fno-fast-math imply. */
2149 set_fast_math_flags (int set)
2151 flag_unsafe_math_optimizations = set;
2152 set_unsafe_math_optimizations_flags (set);
2153 flag_finite_math_only = set;
2154 flag_errno_math = !set;
2157 flag_signaling_nans = 0;
2158 flag_rounding_math = 0;
2159 flag_cx_limited_range = 1;
2163 /* When -funsafe-math-optimizations is set the following
2164 flags are set as well. */
2166 set_unsafe_math_optimizations_flags (int set)
2168 flag_trapping_math = !set;
2169 flag_signed_zeros = !set;
2170 flag_associative_math = set;
2171 flag_reciprocal_math = set;
2174 /* Return true iff flags are set as if -ffast-math. */
2176 fast_math_flags_set_p (void)
2178 return (!flag_trapping_math
2179 && flag_unsafe_math_optimizations
2180 && flag_finite_math_only
2181 && !flag_signed_zeros
2182 && !flag_errno_math);
2185 /* Return true iff flags are set as if -ffast-math but using the flags stored
2186 in the struct cl_optimization structure. */
2188 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2190 return (!opt->flag_trapping_math
2191 && opt->flag_unsafe_math_optimizations
2192 && opt->flag_finite_math_only
2193 && !opt->flag_signed_zeros
2194 && !opt->flag_errno_math);
2197 /* Handle a debug output -g switch. EXTENDED is true or false to support
2198 extended output (2 is special and means "-ggdb" was given). */
2200 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2202 static bool type_explicit;
2204 use_gnu_debug_info_extensions = extended;
2206 if (type == NO_DEBUG)
2208 if (write_symbols == NO_DEBUG)
2210 write_symbols = PREFERRED_DEBUGGING_TYPE;
2214 #ifdef DWARF2_DEBUGGING_INFO
2215 write_symbols = DWARF2_DEBUG;
2216 #elif defined DBX_DEBUGGING_INFO
2217 write_symbols = DBX_DEBUG;
2221 if (write_symbols == NO_DEBUG)
2222 warning (0, "target system does not support debug output");
2227 /* Does it conflict with an already selected type? */
2228 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2229 error ("debug format \"%s\" conflicts with prior selection",
2230 debug_type_names[type]);
2231 write_symbols = type;
2232 type_explicit = true;
2235 /* A debug flag without a level defaults to level 2. */
2238 if (!debug_info_level)
2239 debug_info_level = DINFO_LEVEL_NORMAL;
2243 int argval = integral_argument (arg);
2245 error ("unrecognised debug output level \"%s\"", arg);
2246 else if (argval > 3)
2247 error ("debug output level %s is too high", arg);
2249 debug_info_level = (enum debug_info_level) argval;
2253 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2254 a simple on-off switch. */
2257 option_enabled (int opt_idx)
2259 const struct cl_option *option = &(cl_options[opt_idx]);
2261 if (option->flag_var)
2262 switch (option->var_type)
2265 return *(int *) option->flag_var != 0;
2268 return *(int *) option->flag_var == option->var_value;
2270 case CLVC_BIT_CLEAR:
2271 return (*(int *) option->flag_var & option->var_value) == 0;
2274 return (*(int *) option->flag_var & option->var_value) != 0;
2282 /* Fill STATE with the current state of option OPTION. Return true if
2283 there is some state to store. */
2286 get_option_state (int option, struct cl_option_state *state)
2288 if (cl_options[option].flag_var == 0)
2291 switch (cl_options[option].var_type)
2295 state->data = cl_options[option].flag_var;
2296 state->size = sizeof (int);
2299 case CLVC_BIT_CLEAR:
2301 state->ch = option_enabled (option);
2302 state->data = &state->ch;
2307 state->data = *(const char **) cl_options[option].flag_var;
2308 if (state->data == 0)
2310 state->size = strlen ((const char *) state->data) + 1;
2316 /* Callback function, called when -Werror= enables a warning. */
2318 static void (*warning_as_error_callback) (int) = NULL;
2320 /* Register a callback for enable_warning_as_error calls. */
2323 register_warning_as_error_callback (void (*callback) (int))
2325 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2326 warning_as_error_callback = callback;
2329 /* Enable a warning option as an error. This is used by -Werror= and
2330 also by legacy Werror-implicit-function-declaration. */
2333 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2334 const struct cl_option_handlers *handlers)
2339 new_option = XNEWVEC (char, strlen (arg) + 2);
2340 new_option[0] = 'W';
2341 strcpy (new_option + 1, arg);
2342 option_index = find_opt (new_option, lang_mask);
2343 if (option_index == OPT_SPECIAL_unknown)
2345 error ("-Werror=%s: No option -%s", arg, new_option);
2349 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2351 diagnostic_classify_diagnostic (global_dc, option_index, kind,
2353 if (kind == DK_ERROR)
2355 const struct cl_option * const option = cl_options + option_index;
2357 /* -Werror=foo implies -Wfoo. */
2358 if (option->var_type == CLVC_BOOLEAN)
2359 handle_option (option_index, arg, value, lang_mask, (int)kind,
2362 if (warning_as_error_callback)
2363 warning_as_error_callback (option_index);
2369 /* Return malloced memory for the name of the option OPTION_INDEX
2370 which enabled a diagnostic (context CONTEXT), originally of type
2371 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2375 option_name (diagnostic_context *context, int option_index,
2376 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2380 /* A warning classified as an error. */
2381 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2382 && diag_kind == DK_ERROR)
2383 return concat (cl_options[OPT_Werror_].opt_text,
2384 /* Skip over "-W". */
2385 cl_options[option_index].opt_text + 2,
2387 /* A warning with option. */
2389 return xstrdup (cl_options[option_index].opt_text);
2391 /* A warning without option classified as an error. */
2392 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2393 || diag_kind == DK_WARNING)
2395 if (context->warning_as_error_requested)
2396 return xstrdup (cl_options[OPT_Werror].opt_text);
2398 return xstrdup (_("enabled by default"));