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_tree_loop_distribute_patterns = opt3;
823 flag_predictive_commoning = opt3;
824 flag_inline_functions = opt3;
825 flag_unswitch_loops = opt3;
826 flag_gcse_after_reload = opt3;
827 flag_tree_vectorize = opt3;
828 flag_ipa_cp_clone = opt3;
829 if (flag_ipa_cp_clone)
832 /* Just -O1/-O0 optimizations. */
833 opt1_max = (optimize <= 1);
834 align_loops = opt1_max;
835 align_jumps = opt1_max;
836 align_labels = opt1_max;
837 align_functions = opt1_max;
841 /* Inlining of functions reducing size is a good idea regardless of them
842 being declared inline. */
843 flag_inline_functions = 1;
845 /* Basic optimization options. */
850 /* We want to crossjump as much as possible. */
851 set_param_value ("min-crossjump-insns", 1);
854 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
856 /* -Ofast adds optimizations to -O3. */
859 /* Which is -ffast-math for now. */
860 set_fast_math_flags (1);
861 /* Allow targets to enable extra options with -Ofast
862 before general options processing so disabling them
863 again afterwards works. */
864 targetm.handle_ofast ();
867 /* Enable -Werror=coverage-mismatch by default */
868 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers);
872 /* Initialize whether `char' is signed. */
873 flag_signed_char = DEFAULT_SIGNED_CHAR;
874 /* Set this to a special "uninitialized" value. The actual default is
875 set after target options have been processed. */
876 flag_short_enums = 2;
878 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
880 target_flags = targetm.default_target_flags;
882 /* Some targets have ABI-specified unwind tables. */
883 flag_unwind_tables = targetm.unwind_tables_default;
887 /* Clear any options currently held for LTO. */
888 lto_clear_user_options ();
891 #ifdef OPTIMIZATION_OPTIONS
892 /* Allow default optimizations to be specified on a per-machine basis. */
893 OPTIMIZATION_OPTIONS (optimize, optimize_size);
896 read_cmdline_options (*decoded_options, *decoded_options_count, lang_mask,
899 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
901 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
902 directory. Then try to make DUMP_BASE_NAME relative to the
903 AUX_BASE_NAME directory, typically the directory to contain
906 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
907 else if (aux_base_name)
909 const char *aux_base;
911 base_of_path (aux_base_name, &aux_base);
912 if (aux_base_name != aux_base)
914 int dir_len = aux_base - aux_base_name;
915 char *new_dump_base_name =
916 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
918 /* Copy directory component from AUX_BASE_NAME. */
919 memcpy (new_dump_base_name, aux_base_name, dir_len);
920 /* Append existing DUMP_BASE_NAME. */
921 strcpy (new_dump_base_name + dir_len, dump_base_name);
922 dump_base_name = new_dump_base_name;
927 /* Handle related options for unit-at-a-time, toplevel-reorder, and
929 if (!flag_unit_at_a_time)
931 if (flag_section_anchors == 1)
932 error ("Section anchors must be disabled when unit-at-a-time "
934 flag_section_anchors = 0;
935 if (flag_toplevel_reorder == 1)
936 error ("Toplevel reorder must be disabled when unit-at-a-time "
938 flag_toplevel_reorder = 0;
941 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
942 if (warn_missing_noreturn)
943 warn_suggest_attribute_noreturn = true;
945 /* Unless the user has asked for section anchors, we disable toplevel
946 reordering at -O0 to disable transformations that might be surprising
947 to end users and to get -fno-toplevel-reorder tested. */
948 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
950 flag_toplevel_reorder = 0;
951 flag_section_anchors = 0;
953 if (!flag_toplevel_reorder)
955 if (flag_section_anchors == 1)
956 error ("section anchors must be disabled when toplevel reorder"
958 flag_section_anchors = 0;
965 if (flag_pic && !flag_pie)
967 first_time_p = false;
972 /* Inlining does not work if not optimizing,
973 so force it not to be done. */
978 /* The optimization to partition hot and cold basic blocks into separate
979 sections of the .o and executable files does not work (currently)
980 with exception handling. This is because there is no support for
981 generating unwind info. If flag_exceptions is turned on we need to
982 turn off the partitioning optimization. */
984 if (flag_exceptions && flag_reorder_blocks_and_partition
985 && (USING_SJLJ_EXCEPTIONS
986 #ifdef TARGET_UNWIND_INFO
991 inform (input_location,
992 "-freorder-blocks-and-partition does not work with exceptions on this architecture");
993 flag_reorder_blocks_and_partition = 0;
994 flag_reorder_blocks = 1;
997 /* If user requested unwind info, then turn off the partitioning
1000 if (flag_unwind_tables && ! targetm.unwind_tables_default
1001 && flag_reorder_blocks_and_partition
1002 && (USING_SJLJ_EXCEPTIONS
1003 #ifdef TARGET_UNWIND_INFO
1008 inform (input_location,
1009 "-freorder-blocks-and-partition does not support unwind info on this architecture");
1010 flag_reorder_blocks_and_partition = 0;
1011 flag_reorder_blocks = 1;
1014 /* If the target requested unwind info, then turn off the partitioning
1015 optimization with a different message. Likewise, if the target does not
1016 support named sections. */
1018 if (flag_reorder_blocks_and_partition
1019 && (!targetm.have_named_sections
1020 || (flag_unwind_tables && targetm.unwind_tables_default
1021 && (USING_SJLJ_EXCEPTIONS
1022 #ifdef TARGET_UNWIND_INFO
1027 inform (input_location,
1028 "-freorder-blocks-and-partition does not work on this architecture");
1029 flag_reorder_blocks_and_partition = 0;
1030 flag_reorder_blocks = 1;
1033 /* Pipelining of outer loops is only possible when general pipelining
1034 capabilities are requested. */
1035 if (!flag_sel_sched_pipelining)
1036 flag_sel_sched_pipelining_outer_loops = 0;
1038 if (!targetm.ira_cover_classes
1039 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1041 inform (input_location,
1042 "-fira-algorithm=CB does not work on this architecture");
1043 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1046 if (flag_conserve_stack)
1048 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1049 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1050 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1051 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1053 if (flag_wpa || flag_ltrans)
1055 /* These passes are not WHOPR compatible yet. */
1057 flag_ipa_struct_reorg = 0;
1060 if (flag_lto || flag_whopr)
1063 flag_generate_lto = 1;
1065 /* When generating IL, do not operate in whole-program mode.
1066 Otherwise, symbols will be privatized too early, causing link
1068 flag_whole_program = 0;
1070 error ("LTO support has not been enabled in this configuration");
1074 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1075 check option consistency. */
1076 if (flag_lto && flag_whopr)
1077 error ("-flto and -fwhopr are mutually exclusive");
1080 #define LEFT_COLUMN 27
1082 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1083 followed by word-wrapped HELP in a second column. */
1085 wrap_help (const char *help,
1087 unsigned int item_width,
1088 unsigned int columns)
1090 unsigned int col_width = LEFT_COLUMN;
1091 unsigned int remaining, room, len;
1093 remaining = strlen (help);
1097 room = columns - 3 - MAX (col_width, item_width);
1106 for (i = 0; help[i]; i++)
1108 if (i >= room && len != remaining)
1112 else if ((help[i] == '-' || help[i] == '/')
1113 && help[i + 1] != ' '
1114 && i > 0 && ISALPHA (help[i - 1]))
1119 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1121 while (help[len] == ' ')
1129 /* Print help for a specific front-end, etc. */
1131 print_filtered_help (unsigned int include_flags,
1132 unsigned int exclude_flags,
1133 unsigned int any_flags,
1134 unsigned int columns)
1138 static char *printed = NULL;
1140 bool displayed = false;
1142 if (include_flags == CL_PARAMS)
1144 for (i = 0; i < LAST_PARAM; i++)
1146 const char *param = compiler_params[i].option;
1148 help = compiler_params[i].help;
1149 if (help == NULL || *help == '\0')
1151 if (exclude_flags & CL_UNDOCUMENTED)
1153 help = undocumented_msg;
1156 /* Get the translation. */
1159 wrap_help (help, param, strlen (param), columns);
1166 printed = XCNEWVAR (char, cl_options_count);
1168 for (i = 0; i < cl_options_count; i++)
1170 static char new_help[128];
1171 const struct cl_option *option = cl_options + i;
1176 if (include_flags == 0
1177 || ((option->flags & include_flags) != include_flags))
1179 if ((option->flags & any_flags) == 0)
1183 /* Skip unwanted switches. */
1184 if ((option->flags & exclude_flags) != 0)
1188 /* Skip switches that have already been printed. */
1194 help = option->help;
1197 if (exclude_flags & CL_UNDOCUMENTED)
1199 help = undocumented_msg;
1202 /* Get the translation. */
1205 /* Find the gap between the name of the
1206 option and its descriptive text. */
1207 tab = strchr (help, '\t');
1216 opt = option->opt_text;
1220 /* With the -Q option enabled we change the descriptive text associated
1221 with an option to be an indication of its current setting. */
1224 if (len < (LEFT_COLUMN + 2))
1225 strcpy (new_help, "\t\t");
1227 strcpy (new_help, "\t");
1229 if (option->flag_var != NULL)
1231 if (option->flags & CL_JOINED)
1233 if (option->var_type == CLVC_STRING)
1235 if (* (const char **) option->flag_var != NULL)
1236 snprintf (new_help + strlen (new_help),
1237 sizeof (new_help) - strlen (new_help),
1238 * (const char **) option->flag_var);
1241 sprintf (new_help + strlen (new_help),
1242 "%#x", * (int *) option->flag_var);
1245 strcat (new_help, option_enabled (i)
1246 ? _("[enabled]") : _("[disabled]"));
1252 wrap_help (help, opt, len, columns);
1258 unsigned int langs = include_flags & CL_LANG_ALL;
1261 printf (_(" No options with the desired characteristics were found\n"));
1266 /* PR 31349: Tell the user how to see all of the
1267 options supported by a specific front end. */
1268 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1269 if ((1U << i) & langs)
1270 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1271 lang_names[i], lang_names[i]);
1275 else if (! displayed)
1276 printf (_(" All options with the desired characteristics have already been displayed\n"));
1281 /* Display help for a specified type of option.
1282 The options must have ALL of the INCLUDE_FLAGS set
1283 ANY of the flags in the ANY_FLAGS set
1284 and NONE of the EXCLUDE_FLAGS set. */
1286 print_specific_help (unsigned int include_flags,
1287 unsigned int exclude_flags,
1288 unsigned int any_flags)
1290 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1291 const char * description = NULL;
1292 const char * descrip_extra = "";
1295 static unsigned int columns = 0;
1297 /* Sanity check: Make sure that we do not have more
1298 languages than we have bits available to enumerate them. */
1299 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1301 /* If we have not done so already, obtain
1302 the desired maximum width of the output. */
1307 GET_ENVIRONMENT (p, "COLUMNS");
1310 int value = atoi (p);
1317 /* Use a reasonable default. */
1321 /* Decide upon the title for the options that we are going to display. */
1322 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1324 switch (flag & include_flags)
1330 description = _("The following options are target specific");
1333 description = _("The following options control compiler warning messages");
1335 case CL_OPTIMIZATION:
1336 description = _("The following options control optimizations");
1339 description = _("The following options are language-independent");
1342 description = _("The --param option recognizes the following as parameters");
1345 if (i >= cl_lang_count)
1347 if (exclude_flags & all_langs_mask)
1348 description = _("The following options are specific to just the language ");
1350 description = _("The following options are supported by the language ");
1351 descrip_extra = lang_names [i];
1356 if (description == NULL)
1360 if (include_flags & CL_UNDOCUMENTED)
1361 description = _("The following options are not documented");
1362 else if (include_flags & CL_SEPARATE)
1363 description = _("The following options take separate arguments");
1364 else if (include_flags & CL_JOINED)
1365 description = _("The following options take joined arguments");
1368 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1375 if (any_flags & all_langs_mask)
1376 description = _("The following options are language-related");
1378 description = _("The following options are language-independent");
1382 printf ("%s%s:\n", description, descrip_extra);
1383 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1386 /* Handle target- and language-independent options. Return zero to
1387 generate an "unknown option" message. Only options that need
1388 extra handling need to be listed here; if you simply want
1389 VALUE assigned to a variable, it happens automatically. */
1392 common_handle_option (size_t scode, const char *arg, int value,
1393 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1394 const struct cl_option_handlers *handlers)
1396 static bool verbose = false;
1397 enum opt_code code = (enum opt_code) scode;
1412 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1413 unsigned int undoc_mask;
1416 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1417 /* First display any single language specific options. */
1418 for (i = 0; i < cl_lang_count; i++)
1420 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1421 /* Next display any multi language specific options. */
1422 print_specific_help (0, undoc_mask, all_langs_mask);
1423 /* Then display any remaining, non-language options. */
1424 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1425 print_specific_help (i, undoc_mask, 0);
1426 exit_after_options = true;
1430 case OPT_ftarget_help:
1431 case OPT__target_help:
1432 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1433 exit_after_options = true;
1435 /* Allow the target a chance to give the user some additional information. */
1443 const char * a = arg;
1444 unsigned int include_flags = 0;
1445 /* Note - by default we include undocumented options when listing
1446 specific classes. If you only want to see documented options
1447 then add ",^undocumented" to the --help= option. E.g.:
1449 --help=target,^undocumented */
1450 unsigned int exclude_flags = 0;
1452 /* Walk along the argument string, parsing each word in turn.
1454 arg = [^]{word}[,{arg}]
1455 word = {optimizers|target|warnings|undocumented|
1456 params|common|<language>} */
1461 const char * string;
1466 { "optimizers", CL_OPTIMIZATION },
1467 { "target", CL_TARGET },
1468 { "warnings", CL_WARNING },
1469 { "undocumented", CL_UNDOCUMENTED },
1470 { "params", CL_PARAMS },
1471 { "joined", CL_JOINED },
1472 { "separate", CL_SEPARATE },
1473 { "common", CL_COMMON },
1476 unsigned int * pflags;
1478 unsigned int lang_flag, specific_flag;
1485 pflags = & exclude_flags;
1488 pflags = & include_flags;
1490 comma = strchr (a, ',');
1501 /* Check to see if the string matches an option class name. */
1502 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1503 if (strncasecmp (a, specifics[i].string, len) == 0)
1505 specific_flag = specifics[i].flag;
1509 /* Check to see if the string matches a language name.
1510 Note - we rely upon the alpha-sorted nature of the entries in
1511 the lang_names array, specifically that shorter names appear
1512 before their longer variants. (i.e. C before C++). That way
1513 when we are attempting to match --help=c for example we will
1514 match with C first and not C++. */
1515 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1516 if (strncasecmp (a, lang_names[i], len) == 0)
1518 lang_flag = 1U << i;
1522 if (specific_flag != 0)
1525 * pflags |= specific_flag;
1528 /* The option's argument matches both the start of a
1529 language name and the start of an option class name.
1530 We have a special case for when the user has
1531 specified "--help=c", but otherwise we have to issue
1533 if (strncasecmp (a, "c", len) == 0)
1534 * pflags |= lang_flag;
1537 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1541 else if (lang_flag != 0)
1542 * pflags |= lang_flag;
1545 "warning: unrecognized argument to --help= option: %.*s\n",
1554 print_specific_help (include_flags, exclude_flags, 0);
1555 exit_after_options = true;
1561 exit_after_options = true;
1567 /* Currently handled in a prescan. */
1571 enable_warning_as_error (arg, value, lang_mask, handlers);
1574 case OPT_Wlarger_than_:
1575 /* This form corresponds to -Wlarger-than-.
1576 Kept for backward compatibility.
1577 Don't use it as the first argument of warning(). */
1579 case OPT_Wlarger_than_eq:
1580 larger_than_size = value;
1581 warn_larger_than = value != -1;
1584 case OPT_Wfatal_errors:
1585 global_dc->fatal_errors = value;
1588 case OPT_Wframe_larger_than_:
1589 frame_larger_than_size = value;
1590 warn_frame_larger_than = value != -1;
1593 case OPT_Wstrict_aliasing:
1594 set_Wstrict_aliasing (value);
1597 case OPT_Wstrict_aliasing_:
1598 warn_strict_aliasing = value;
1601 case OPT_Wstrict_overflow:
1602 warn_strict_overflow = (value
1603 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1607 case OPT_Wstrict_overflow_:
1608 warn_strict_overflow = value;
1611 case OPT_Wsystem_headers:
1612 global_dc->warn_system_headers = value;
1616 warn_unused = value;
1621 aux_info_file_name = arg;
1622 flag_gen_aux_info = 1;
1626 aux_base_name = arg;
1629 case OPT_auxbase_strip:
1631 char *tmp = xstrdup (arg);
1632 strip_off_ending (tmp, strlen (tmp));
1634 aux_base_name = tmp;
1639 decode_d_option (arg);
1643 dump_base_name = arg;
1647 dump_dir_name = arg;
1650 case OPT_falign_functions_:
1651 align_functions = value;
1654 case OPT_falign_jumps_:
1655 align_jumps = value;
1658 case OPT_falign_labels_:
1659 align_labels = value;
1662 case OPT_falign_loops_:
1663 align_loops = value;
1666 case OPT_fbranch_probabilities:
1667 flag_branch_probabilities_set = true;
1670 case OPT_fcall_used_:
1671 fix_register (arg, 0, 1);
1674 case OPT_fcall_saved_:
1675 fix_register (arg, 0, 0);
1679 dbg_cnt_process_opt (arg);
1682 case OPT_fdbg_cnt_list:
1683 dbg_cnt_list_all_counters ();
1686 case OPT_fdebug_prefix_map_:
1687 add_debug_prefix_map (arg);
1690 case OPT_fdiagnostics_show_location_:
1691 if (!strcmp (arg, "once"))
1692 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1693 else if (!strcmp (arg, "every-line"))
1694 diagnostic_prefixing_rule (global_dc)
1695 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1700 case OPT_fdiagnostics_show_option:
1701 global_dc->show_option_requested = value;
1705 if (!dump_switch_p (arg))
1709 case OPT_fexcess_precision_:
1710 if (!strcmp (arg, "fast"))
1711 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1712 else if (!strcmp (arg, "standard"))
1713 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1715 error ("unknown excess precision style \"%s\"", arg);
1718 case OPT_ffast_math:
1719 set_fast_math_flags (value);
1722 case OPT_funsafe_math_optimizations:
1723 set_unsafe_math_optimizations_flags (value);
1727 fix_register (arg, 1, 1);
1730 case OPT_finline_limit_:
1731 case OPT_finline_limit_eq:
1732 set_param_value ("max-inline-insns-single", value / 2);
1733 set_param_value ("max-inline-insns-auto", value / 2);
1736 case OPT_finstrument_functions_exclude_function_list_:
1737 add_comma_separated_to_vector
1738 (&flag_instrument_functions_exclude_functions, arg);
1741 case OPT_finstrument_functions_exclude_file_list_:
1742 add_comma_separated_to_vector
1743 (&flag_instrument_functions_exclude_files, arg);
1746 case OPT_fmessage_length_:
1747 pp_set_line_maximum_length (global_dc->printer, value);
1750 case OPT_fpack_struct_:
1751 if (value <= 0 || (value & (value - 1)) || value > 16)
1752 error ("structure alignment must be a small power of two, not %d", value);
1755 initial_max_fld_align = value;
1756 maximum_field_alignment = value * BITS_PER_UNIT;
1760 case OPT_fpeel_loops:
1761 flag_peel_loops_set = true;
1765 #ifdef ENABLE_PLUGIN
1766 add_new_plugin (arg);
1768 error ("Plugin support is disabled. Configure with --enable-plugin.");
1772 case OPT_fplugin_arg_:
1773 #ifdef ENABLE_PLUGIN
1774 parse_plugin_arg_opt (arg);
1776 error ("Plugin support is disabled. Configure with --enable-plugin.");
1780 case OPT_fprofile_arcs:
1781 profile_arc_flag_set = true;
1784 case OPT_finline_functions:
1785 flag_inline_functions_set = true;
1788 case OPT_fprofile_dir_:
1789 profile_data_prefix = xstrdup (arg);
1792 case OPT_fprofile_use_:
1793 profile_data_prefix = xstrdup (arg);
1794 flag_profile_use = true;
1796 /* No break here - do -fprofile-use processing. */
1797 case OPT_fprofile_use:
1798 if (!flag_branch_probabilities_set)
1799 flag_branch_probabilities = value;
1800 if (!flag_profile_values_set)
1801 flag_profile_values = value;
1802 if (!flag_unroll_loops_set)
1803 flag_unroll_loops = value;
1804 if (!flag_peel_loops_set)
1805 flag_peel_loops = value;
1806 if (!flag_tracer_set)
1807 flag_tracer = value;
1808 if (!flag_value_profile_transformations_set)
1809 flag_value_profile_transformations = value;
1810 if (!flag_inline_functions_set)
1811 flag_inline_functions = value;
1812 if (!flag_ipa_cp_set)
1813 flag_ipa_cp = value;
1814 if (!flag_ipa_cp_clone_set
1815 && value && flag_ipa_cp)
1816 flag_ipa_cp_clone = value;
1817 if (!flag_predictive_commoning_set)
1818 flag_predictive_commoning = value;
1819 if (!flag_unswitch_loops_set)
1820 flag_unswitch_loops = value;
1821 if (!flag_gcse_after_reload_set)
1822 flag_gcse_after_reload = value;
1825 case OPT_fprofile_generate_:
1826 profile_data_prefix = xstrdup (arg);
1828 /* No break here - do -fprofile-generate processing. */
1829 case OPT_fprofile_generate:
1830 if (!profile_arc_flag_set)
1831 profile_arc_flag = value;
1832 if (!flag_profile_values_set)
1833 flag_profile_values = value;
1834 if (!flag_value_profile_transformations_set)
1835 flag_value_profile_transformations = value;
1836 if (!flag_inline_functions_set)
1837 flag_inline_functions = value;
1840 case OPT_fprofile_values:
1841 flag_profile_values_set = true;
1844 case OPT_fshow_column:
1845 global_dc->show_column = value;
1848 case OPT_fvisibility_:
1850 if (!strcmp(arg, "default"))
1851 default_visibility = VISIBILITY_DEFAULT;
1852 else if (!strcmp(arg, "internal"))
1853 default_visibility = VISIBILITY_INTERNAL;
1854 else if (!strcmp(arg, "hidden"))
1855 default_visibility = VISIBILITY_HIDDEN;
1856 else if (!strcmp(arg, "protected"))
1857 default_visibility = VISIBILITY_PROTECTED;
1859 error ("unrecognized visibility value \"%s\"", arg);
1864 flag_value_profile_transformations_set = true;
1867 case OPT_frandom_seed:
1868 /* The real switch is -fno-random-seed. */
1871 set_random_seed (NULL);
1874 case OPT_frandom_seed_:
1875 set_random_seed (arg);
1878 case OPT_fselective_scheduling:
1879 case OPT_fselective_scheduling2:
1880 sel_sched_switch_set = true;
1883 case OPT_fsched_verbose_:
1884 #ifdef INSN_SCHEDULING
1885 fix_sched_param ("verbose", arg);
1891 case OPT_fsched_stalled_insns_:
1892 flag_sched_stalled_insns = value;
1893 if (flag_sched_stalled_insns == 0)
1894 flag_sched_stalled_insns = -1;
1897 case OPT_fsched_stalled_insns_dep_:
1898 flag_sched_stalled_insns_dep = value;
1901 case OPT_fstack_check_:
1902 if (!strcmp (arg, "no"))
1903 flag_stack_check = NO_STACK_CHECK;
1904 else if (!strcmp (arg, "generic"))
1905 /* This is the old stack checking method. */
1906 flag_stack_check = STACK_CHECK_BUILTIN
1907 ? FULL_BUILTIN_STACK_CHECK
1908 : GENERIC_STACK_CHECK;
1909 else if (!strcmp (arg, "specific"))
1910 /* This is the new stack checking method. */
1911 flag_stack_check = STACK_CHECK_BUILTIN
1912 ? FULL_BUILTIN_STACK_CHECK
1913 : STACK_CHECK_STATIC_BUILTIN
1914 ? STATIC_BUILTIN_STACK_CHECK
1915 : GENERIC_STACK_CHECK;
1917 warning (0, "unknown stack check parameter \"%s\"", arg);
1920 case OPT_fstack_check:
1921 /* This is the same as the "specific" mode above. */
1923 flag_stack_check = STACK_CHECK_BUILTIN
1924 ? FULL_BUILTIN_STACK_CHECK
1925 : STACK_CHECK_STATIC_BUILTIN
1926 ? STATIC_BUILTIN_STACK_CHECK
1927 : GENERIC_STACK_CHECK;
1929 flag_stack_check = NO_STACK_CHECK;
1932 case OPT_fstack_limit:
1933 /* The real switch is -fno-stack-limit. */
1936 stack_limit_rtx = NULL_RTX;
1939 case OPT_fstack_limit_register_:
1941 int reg = decode_reg_name (arg);
1943 error ("unrecognized register name \"%s\"", arg);
1945 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1949 case OPT_fstack_limit_symbol_:
1950 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1953 case OPT_ftree_vectorizer_verbose_:
1954 vect_set_verbosity_level (arg);
1957 case OPT_ftls_model_:
1958 if (!strcmp (arg, "global-dynamic"))
1959 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1960 else if (!strcmp (arg, "local-dynamic"))
1961 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1962 else if (!strcmp (arg, "initial-exec"))
1963 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1964 else if (!strcmp (arg, "local-exec"))
1965 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1967 warning (0, "unknown tls-model \"%s\"", arg);
1970 case OPT_fira_algorithm_:
1971 if (!strcmp (arg, "CB"))
1972 flag_ira_algorithm = IRA_ALGORITHM_CB;
1973 else if (!strcmp (arg, "priority"))
1974 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1976 warning (0, "unknown ira algorithm \"%s\"", arg);
1979 case OPT_fira_region_:
1980 if (!strcmp (arg, "one"))
1981 flag_ira_region = IRA_REGION_ONE;
1982 else if (!strcmp (arg, "all"))
1983 flag_ira_region = IRA_REGION_ALL;
1984 else if (!strcmp (arg, "mixed"))
1985 flag_ira_region = IRA_REGION_MIXED;
1987 warning (0, "unknown ira region \"%s\"", arg);
1990 case OPT_fira_verbose_:
1991 flag_ira_verbose = value;
1995 flag_tracer_set = true;
1999 flag_ipa_cp_set = true;
2002 case OPT_fipa_cp_clone:
2003 flag_ipa_cp_clone_set = true;
2006 case OPT_fpredictive_commoning:
2007 flag_predictive_commoning_set = true;
2010 case OPT_funswitch_loops:
2011 flag_unswitch_loops_set = true;
2014 case OPT_fgcse_after_reload:
2015 flag_gcse_after_reload_set = true;
2018 case OPT_funroll_loops:
2019 flag_unroll_loops_set = true;
2023 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2027 set_debug_level (SDB_DEBUG, false, arg);
2031 if (value < 2 || value > 4)
2032 error ("dwarf version %d is not supported", value);
2034 dwarf_version = value;
2035 set_debug_level (DWARF2_DEBUG, false, "");
2039 set_debug_level (NO_DEBUG, 2, arg);
2044 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2048 set_debug_level (VMS_DEBUG, false, arg);
2053 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2057 asm_file_name = arg;
2060 case OPT_pedantic_errors:
2061 flag_pedantic_errors = pedantic = 1;
2062 global_dc->pedantic_errors = 1;
2070 global_dc->inhibit_warnings = true;
2074 case OPT_fcse_skip_blocks:
2075 case OPT_floop_optimize:
2076 case OPT_frerun_loop_opt:
2077 case OPT_fsched2_use_traces:
2078 case OPT_fstrength_reduce:
2079 case OPT_ftree_store_copy_prop:
2080 case OPT_fforce_addr:
2081 case OPT_ftree_salias:
2082 case OPT_ftree_store_ccp:
2083 case OPT_Wunreachable_code:
2084 case OPT_fargument_alias:
2085 case OPT_fargument_noalias:
2086 case OPT_fargument_noalias_anything:
2087 case OPT_fargument_noalias_global:
2088 /* These are no-ops, preserved for backward compatibility. */
2091 case OPT_fuse_linker_plugin:
2092 /* No-op. Used by the driver and passed to us because it starts with f.*/
2096 /* If the flag was handled in a standard way, assume the lack of
2097 processing here is intentional. */
2098 gcc_assert (cl_options[scode].flag_var);
2105 /* Handle --param NAME=VALUE. */
2107 handle_param (const char *carg)
2112 arg = xstrdup (carg);
2113 equal = strchr (arg, '=');
2115 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2118 value = integral_argument (equal + 1);
2120 error ("invalid --param value %qs", equal + 1);
2124 set_param_value (arg, value);
2131 /* Used to set the level of strict aliasing warnings,
2132 when no level is specified (i.e., when -Wstrict-aliasing, and not
2133 -Wstrict-aliasing=level was given).
2134 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2135 and 0 otherwise. After calling this function, wstrict_aliasing will be
2136 set to the default value of -Wstrict_aliasing=level, currently 3. */
2138 set_Wstrict_aliasing (int onoff)
2140 gcc_assert (onoff == 0 || onoff == 1);
2142 warn_strict_aliasing = 3;
2144 warn_strict_aliasing = 0;
2147 /* The following routines are useful in setting all the flags that
2148 -ffast-math and -fno-fast-math imply. */
2150 set_fast_math_flags (int set)
2152 flag_unsafe_math_optimizations = set;
2153 set_unsafe_math_optimizations_flags (set);
2154 flag_finite_math_only = set;
2155 flag_errno_math = !set;
2158 flag_signaling_nans = 0;
2159 flag_rounding_math = 0;
2160 flag_cx_limited_range = 1;
2164 /* When -funsafe-math-optimizations is set the following
2165 flags are set as well. */
2167 set_unsafe_math_optimizations_flags (int set)
2169 flag_trapping_math = !set;
2170 flag_signed_zeros = !set;
2171 flag_associative_math = set;
2172 flag_reciprocal_math = set;
2175 /* Return true iff flags are set as if -ffast-math. */
2177 fast_math_flags_set_p (void)
2179 return (!flag_trapping_math
2180 && flag_unsafe_math_optimizations
2181 && flag_finite_math_only
2182 && !flag_signed_zeros
2183 && !flag_errno_math);
2186 /* Return true iff flags are set as if -ffast-math but using the flags stored
2187 in the struct cl_optimization structure. */
2189 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2191 return (!opt->flag_trapping_math
2192 && opt->flag_unsafe_math_optimizations
2193 && opt->flag_finite_math_only
2194 && !opt->flag_signed_zeros
2195 && !opt->flag_errno_math);
2198 /* Handle a debug output -g switch. EXTENDED is true or false to support
2199 extended output (2 is special and means "-ggdb" was given). */
2201 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2203 static bool type_explicit;
2205 use_gnu_debug_info_extensions = extended;
2207 if (type == NO_DEBUG)
2209 if (write_symbols == NO_DEBUG)
2211 write_symbols = PREFERRED_DEBUGGING_TYPE;
2215 #ifdef DWARF2_DEBUGGING_INFO
2216 write_symbols = DWARF2_DEBUG;
2217 #elif defined DBX_DEBUGGING_INFO
2218 write_symbols = DBX_DEBUG;
2222 if (write_symbols == NO_DEBUG)
2223 warning (0, "target system does not support debug output");
2228 /* Does it conflict with an already selected type? */
2229 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2230 error ("debug format \"%s\" conflicts with prior selection",
2231 debug_type_names[type]);
2232 write_symbols = type;
2233 type_explicit = true;
2236 /* A debug flag without a level defaults to level 2. */
2239 if (!debug_info_level)
2240 debug_info_level = DINFO_LEVEL_NORMAL;
2244 int argval = integral_argument (arg);
2246 error ("unrecognised debug output level \"%s\"", arg);
2247 else if (argval > 3)
2248 error ("debug output level %s is too high", arg);
2250 debug_info_level = (enum debug_info_level) argval;
2254 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2255 a simple on-off switch. */
2258 option_enabled (int opt_idx)
2260 const struct cl_option *option = &(cl_options[opt_idx]);
2262 if (option->flag_var)
2263 switch (option->var_type)
2266 return *(int *) option->flag_var != 0;
2269 return *(int *) option->flag_var == option->var_value;
2271 case CLVC_BIT_CLEAR:
2272 return (*(int *) option->flag_var & option->var_value) == 0;
2275 return (*(int *) option->flag_var & option->var_value) != 0;
2283 /* Fill STATE with the current state of option OPTION. Return true if
2284 there is some state to store. */
2287 get_option_state (int option, struct cl_option_state *state)
2289 if (cl_options[option].flag_var == 0)
2292 switch (cl_options[option].var_type)
2296 state->data = cl_options[option].flag_var;
2297 state->size = sizeof (int);
2300 case CLVC_BIT_CLEAR:
2302 state->ch = option_enabled (option);
2303 state->data = &state->ch;
2308 state->data = *(const char **) cl_options[option].flag_var;
2309 if (state->data == 0)
2311 state->size = strlen ((const char *) state->data) + 1;
2317 /* Callback function, called when -Werror= enables a warning. */
2319 static void (*warning_as_error_callback) (int) = NULL;
2321 /* Register a callback for enable_warning_as_error calls. */
2324 register_warning_as_error_callback (void (*callback) (int))
2326 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2327 warning_as_error_callback = callback;
2330 /* Enable a warning option as an error. This is used by -Werror= and
2331 also by legacy Werror-implicit-function-declaration. */
2334 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2335 const struct cl_option_handlers *handlers)
2340 new_option = XNEWVEC (char, strlen (arg) + 2);
2341 new_option[0] = 'W';
2342 strcpy (new_option + 1, arg);
2343 option_index = find_opt (new_option, lang_mask);
2344 if (option_index == OPT_SPECIAL_unknown)
2346 error ("-Werror=%s: No option -%s", arg, new_option);
2350 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2352 diagnostic_classify_diagnostic (global_dc, option_index, kind,
2354 if (kind == DK_ERROR)
2356 const struct cl_option * const option = cl_options + option_index;
2358 /* -Werror=foo implies -Wfoo. */
2359 if (option->var_type == CLVC_BOOLEAN)
2360 handle_option (option_index, arg, value, lang_mask, (int)kind,
2363 if (warning_as_error_callback)
2364 warning_as_error_callback (option_index);
2370 /* Return malloced memory for the name of the option OPTION_INDEX
2371 which enabled a diagnostic (context CONTEXT), originally of type
2372 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2376 option_name (diagnostic_context *context, int option_index,
2377 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2381 /* A warning classified as an error. */
2382 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2383 && diag_kind == DK_ERROR)
2384 return concat (cl_options[OPT_Werror_].opt_text,
2385 /* Skip over "-W". */
2386 cl_options[option_index].opt_text + 2,
2388 /* A warning with option. */
2390 return xstrdup (cl_options[option_index].opt_text);
2392 /* A warning without option classified as an error. */
2393 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2394 || diag_kind == DK_WARNING)
2396 if (context->warning_as_error_requested)
2397 return xstrdup (cl_options[OPT_Werror].opt_text);
2399 return xstrdup (_("enabled by default"));