1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
25 #include "coretypes.h"
31 #include "langhooks.h"
37 #include "diagnostic.h"
38 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
39 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 /* Value of the -G xx switch, and whether it was passed or not. */
43 unsigned HOST_WIDE_INT g_switch_value;
46 /* True if we should exit after parsing options. */
47 bool exit_after_options;
52 /* Print various extra warnings. -W/-Wextra. */
55 /* Don't print warning messages. -w. */
56 bool inhibit_warnings;
58 /* Treat warnings as errors. -Werror. */
59 bool warnings_are_errors;
61 /* Warn if a function returns an aggregate, since there are often
62 incompatible calling conventions for doing this. */
63 bool warn_aggregate_return;
65 /* Nonzero means warn about pointer casts that increase the required
66 alignment of the target type (and might therefore lead to a crash
67 due to a misaligned access). */
70 /* Nonzero means warn about uses of __attribute__((deprecated))
72 bool warn_deprecated_decl = true;
74 /* Warn when an optimization pass is disabled. */
75 bool warn_disabled_optimization;
77 /* Nonzero means warn if inline function is too large. */
80 /* True to warn about any objects definitions whose size is larger
81 than N bytes. Also want about function definitions whose returned
82 values are larger than N bytes, where N is `larger_than_size'. */
83 bool warn_larger_than;
84 HOST_WIDE_INT larger_than_size;
86 /* Warn about functions which might be candidates for attribute noreturn. */
87 bool warn_missing_noreturn;
89 /* True to warn about code which is never reached. */
92 /* Warn if packed attribute on struct is unnecessary and inefficient. */
95 /* Warn when gcc pads a structure to an alignment boundary. */
98 /* True means warn about all declarations which shadow others. */
101 /* Nonzero means warn about constructs which might not be
102 strict-aliasing safe. */
103 int warn_strict_aliasing;
105 /* True to warn if a switch on an enum, that does not have a default
106 case, fails to have a case for every enum value. */
109 /* Warn if a switch does not have a default case. */
110 bool warn_switch_default;
112 /* Warn if a switch on an enum fails to have a case for every enum
113 value (regardless of the presence or otherwise of a default case). */
114 bool warn_switch_enum;
116 /* Don't suppress warnings from system headers. -Wsystem-headers. */
117 bool warn_system_headers;
119 /* True to warn about variables used before they are initialized. */
120 int warn_uninitialized;
122 /* True to warn about unused variables, functions et.al. */
123 bool warn_unused_function;
124 bool warn_unused_label;
125 bool warn_unused_parameter;
126 bool warn_unused_variable;
127 bool warn_unused_value;
129 /* Hack for cooperation between set_Wunused and set_Wextra. */
130 static bool maybe_warn_unused_parameter;
132 /* Type(s) of debugging information we are producing (if any). See
133 flags.h for the definitions of the different possible types of
134 debugging information. */
135 enum debug_info_type write_symbols = NO_DEBUG;
137 /* Level of debugging information we are producing. See flags.h for
138 the definitions of the different possible levels. */
139 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
141 /* Nonzero means use GNU-only extensions in the generated symbolic
142 debugging information. Currently, this only has an effect when
143 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
144 bool use_gnu_debug_info_extensions;
146 /* Columns of --help display. */
147 static unsigned int columns = 80;
149 /* What to print when a switch has no documentation. */
150 static const char undocumented_msg[] = N_("This switch lacks documentation");
152 /* Used for bookkeeping on whether user set these flags so
153 -fprofile-use/-fprofile-generate does not use them. */
154 static bool profile_arc_flag_set, flag_profile_values_set;
155 static bool flag_unroll_loops_set, flag_tracer_set;
156 static bool flag_value_profile_transformations_set;
157 static bool flag_peel_loops_set, flag_branch_probabilities_set;
159 /* Input file names. */
160 const char **in_fnames;
161 unsigned num_in_fnames;
163 static size_t find_opt (const char *, int);
164 static int common_handle_option (size_t scode, const char *arg, int value);
165 static void handle_param (const char *);
166 static void set_Wextra (int);
167 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
168 static char *write_langs (unsigned int lang_mask);
169 static void complain_wrong_lang (const char *, const struct cl_option *,
170 unsigned int lang_mask);
171 static void handle_options (unsigned int, const char **, unsigned int);
172 static void wrap_help (const char *help, const char *item, unsigned int);
173 static void print_help (void);
174 static void print_param_help (void);
175 static void print_filtered_help (unsigned int flag);
176 static unsigned int print_switch (const char *text, unsigned int indent);
177 static void set_debug_level (enum debug_info_type type, int extended,
180 /* Perform a binary search to find which option the command-line INPUT
181 matches. Returns its index in the option array, and N_OPTS
182 (cl_options_count) on failure.
184 This routine is quite subtle. A normal binary search is not good
185 enough because some options can be suffixed with an argument, and
186 multiple sub-matches can occur, e.g. input of "-pedantic" matching
187 the initial substring of "-pedantic-errors".
189 A more complicated example is -gstabs. It should match "-g" with
190 an argument of "stabs". Suppose, however, that the number and list
191 of switches are such that the binary search tests "-gen-decls"
192 before having tested "-g". This doesn't match, and as "-gen-decls"
193 is less than "-gstabs", it will become the lower bound of the
194 binary search range, and "-g" will never be seen. To resolve this
195 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
196 to "-g" so that failed searches that end between "-gen-decls" and
197 the lexicographically subsequent switch know to go back and see if
198 "-g" causes a match (which it does in this example).
200 This search is done in such a way that the longest match for the
201 front end in question wins. If there is no match for the current
202 front end, the longest match for a different front end is returned
203 (or N_OPTS if none) and the caller emits an error message. */
205 find_opt (const char *input, int lang_mask)
207 size_t mn, mx, md, opt_len;
208 size_t match_wrong_lang;
212 mx = cl_options_count;
214 /* Find mn such this lexicographical inequality holds:
215 cl_options[mn] <= input < cl_options[mn + 1]. */
219 opt_len = cl_options[md].opt_len;
220 comp = strncmp (input, cl_options[md].opt_text + 1, opt_len);
228 /* This is the switch that is the best match but for a different
229 front end, or cl_options_count if there is no match at all. */
230 match_wrong_lang = cl_options_count;
232 /* Backtrace the chain of possible matches, returning the longest
233 one, if any, that fits best. With current GCC switches, this
234 loop executes at most twice. */
237 const struct cl_option *opt = &cl_options[mn];
239 /* Is this switch a prefix of the input? */
240 if (!strncmp (input, opt->opt_text + 1, opt->opt_len))
242 /* If language is OK, and the match is exact or the switch
243 takes a joined argument, return it. */
244 if ((opt->flags & lang_mask)
245 && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
248 /* If we haven't remembered a prior match, remember this
249 one. Any prior match is necessarily better. */
250 if (match_wrong_lang == cl_options_count)
251 match_wrong_lang = mn;
254 /* Try the next possibility. This is cl_options_count if there
256 mn = opt->back_chain;
258 while (mn != cl_options_count);
260 /* Return the best wrong match, or cl_options_count if none. */
261 return match_wrong_lang;
264 /* If ARG is a non-negative integer made up solely of digits, return its
265 value, otherwise return -1. */
267 integral_argument (const char *arg)
271 while (*p && ISDIGIT (*p))
280 /* Return a malloced slash-separated list of languages in MASK. */
282 write_langs (unsigned int mask)
284 unsigned int n = 0, len = 0;
285 const char *lang_name;
288 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
289 if (mask & (1U << n))
290 len += strlen (lang_name) + 1;
292 result = xmalloc (len);
294 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
295 if (mask & (1U << n))
299 strcpy (result + len, lang_name);
300 len += strlen (lang_name);
308 /* Complain that switch OPT_INDEX does not apply to this front end. */
310 complain_wrong_lang (const char *text, const struct cl_option *option,
311 unsigned int lang_mask)
313 char *ok_langs, *bad_lang;
315 ok_langs = write_langs (option->flags);
316 bad_lang = write_langs (lang_mask);
318 /* Eventually this should become a hard error IMO. */
319 warning ("command line option \"%s\" is valid for %s but not for %s",
320 text, ok_langs, bad_lang);
326 /* Handle the switch beginning at ARGV for the language indicated by
327 LANG_MASK. Returns the number of switches consumed. */
329 handle_option (const char **argv, unsigned int lang_mask)
332 const char *opt, *arg = 0;
335 unsigned int result = 0;
336 const struct cl_option *option;
340 /* Drop the "no-" from negative switches. */
341 if ((opt[1] == 'W' || opt[1] == 'f')
342 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
344 size_t len = strlen (opt) - 3;
346 dup = xmalloc (len + 1);
349 memcpy (dup + 2, opt + 5, len - 2 + 1);
354 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON);
355 if (opt_index == cl_options_count)
358 option = &cl_options[opt_index];
360 /* Reject negative form of switches that don't take negatives as
362 if (!value && (option->flags & CL_REJECT_NEGATIVE))
365 /* We've recognized this switch. */
368 /* Sort out any argument the switch takes. */
369 if (option->flags & CL_JOINED)
371 /* Have arg point to the original switch. This is because
372 some code, such as disable_builtin_function, expects its
373 argument to be persistent until the program exits. */
374 arg = argv[0] + cl_options[opt_index].opt_len + 1;
376 arg += strlen ("no-");
378 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
380 if (option->flags & CL_SEPARATE)
386 /* Missing argument. */
390 else if (option->flags & CL_SEPARATE)
396 /* Now we've swallowed any potential argument, complain if this
397 is a switch for a different front end. */
398 if (!(option->flags & (lang_mask | CL_COMMON)))
400 complain_wrong_lang (argv[0], option, lang_mask);
404 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
406 if (!lang_hooks.missing_argument (opt, opt_index))
407 error ("missing argument to \"%s\"", opt);
411 /* If the switch takes an integer, convert it. */
412 if (arg && (option->flags & CL_UINTEGER))
414 value = integral_argument (arg);
417 error ("argument to \"%s\" should be a non-negative integer",
423 if (option->flags & lang_mask)
424 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
427 if (result && (option->flags & CL_COMMON))
428 if (common_handle_option (opt_index, arg, value) == 0)
437 /* Decode and handle the vector of command line options. LANG_MASK
438 contains has a single bit set representing the current
441 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
445 for (i = 1; i < argc; i += n)
447 const char *opt = argv[i];
449 /* Interpret "-" or a non-switch as a file name. */
450 if (opt[0] != '-' || opt[1] == '\0')
452 if (main_input_filename == NULL)
453 main_input_filename = opt;
454 add_input_filename (opt);
459 n = handle_option (argv + i, lang_mask);
464 error ("unrecognized command line option \"%s\"", opt);
469 /* Handle FILENAME from the command line. */
471 add_input_filename (const char *filename)
474 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0]));
475 in_fnames[num_in_fnames - 1] = filename;
478 /* Parse command line options and set default flag values. Do minimal
479 options processing. */
481 decode_options (unsigned int argc, const char **argv)
483 unsigned int i, lang_mask;
485 /* Perform language-specific options initialization. */
486 lang_mask = lang_hooks.init_options (argc, argv);
488 lang_hooks.initialize_diagnostics (global_dc);
490 /* Scan to see what optimization level has been specified. That will
491 determine the default value of many flags. */
492 for (i = 1; i < argc; i++)
494 if (!strcmp (argv[i], "-O"))
499 else if (argv[i][0] == '-' && argv[i][1] == 'O')
501 /* Handle -Os, -O2, -O3, -O69, ... */
502 const char *p = &argv[i][2];
504 if ((p[0] == 's') && (p[1] == 0))
508 /* Optimizing for size forces optimize to be 2. */
513 const int optimize_val = read_integral_parameter (p, p - 2, -1);
514 if (optimize_val != -1)
516 optimize = optimize_val;
525 flag_merge_constants = 0;
531 flag_thread_jumps = 1;
533 flag_delayed_branch = 1;
535 #ifdef CAN_DEBUG_WITHOUT_FP
536 flag_omit_frame_pointer = 1;
538 flag_guess_branch_prob = 1;
539 flag_cprop_registers = 1;
540 flag_loop_optimize = 1;
541 flag_if_conversion = 1;
542 flag_if_conversion2 = 1;
547 flag_crossjumping = 1;
548 flag_optimize_sibling_calls = 1;
549 flag_cse_follow_jumps = 1;
550 flag_cse_skip_blocks = 1;
552 flag_expensive_optimizations = 1;
553 flag_strength_reduce = 1;
554 flag_rerun_cse_after_loop = 1;
555 flag_rerun_loop_opt = 1;
556 flag_caller_saves = 1;
559 #ifdef INSN_SCHEDULING
560 flag_schedule_insns = 1;
561 flag_schedule_insns_after_reload = 1;
564 flag_strict_aliasing = 1;
565 flag_delete_null_pointer_checks = 1;
566 flag_reorder_blocks = 1;
567 flag_reorder_functions = 1;
568 flag_unit_at_a_time = 1;
573 flag_inline_functions = 1;
574 flag_unswitch_loops = 1;
575 flag_gcse_after_reload = 1;
578 if (optimize < 2 || optimize_size)
585 /* Don't reorder blocks when optimizing for size because extra
586 jump insns may be created; also barrier may create extra padding.
588 More correctly we should have a block reordering mode that tried
589 to minimize the combined size of all the jumps. This would more
590 or less automatically remove extra jumps, but would also try to
591 use more short jumps instead of long jumps. */
592 flag_reorder_blocks = 0;
593 flag_reorder_blocks_and_partition = 0;
598 /* Inlining of very small functions usually reduces total size. */
599 set_param_value ("max-inline-insns-single", 5);
600 set_param_value ("max-inline-insns-auto", 5);
601 set_param_value ("max-inline-insns-rtl", 10);
602 flag_inline_functions = 1;
605 /* Initialize whether `char' is signed. */
606 flag_signed_char = DEFAULT_SIGNED_CHAR;
607 /* Initialize how much space enums occupy, by default. */
608 flag_short_enums = targetm.default_short_enums ();
610 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
613 set_target_switch ("");
615 /* Unwind tables are always present in an ABI-conformant IA-64
616 object file, so the default should be ON. */
617 #ifdef IA64_UNWIND_INFO
618 flag_unwind_tables = IA64_UNWIND_INFO;
621 #ifdef OPTIMIZATION_OPTIONS
622 /* Allow default optimizations to be specified on a per-machine basis. */
623 OPTIMIZATION_OPTIONS (optimize, optimize_size);
626 handle_options (argc, argv, lang_mask);
630 if (flag_pic && !flag_pie)
633 if (flag_no_inline == 2)
636 flag_really_no_inline = flag_no_inline;
638 /* Set flag_no_inline before the post_options () hook. The C front
639 ends use it to determine tree inlining defaults. FIXME: such
640 code should be lang-independent when all front ends use tree
641 inlining, in which case it, and this condition, should be moved
642 to the top of process_options() instead. */
645 /* Inlining does not work if not optimizing,
646 so force it not to be done. */
650 /* The c_decode_option function and decode_option hook set
651 this to `2' if -Wall is used, so we can avoid giving out
652 lots of errors for people who don't realize what -Wall does. */
653 if (warn_uninitialized == 1)
654 warning ("-Wuninitialized is not supported without -O");
657 if (flag_really_no_inline == 2)
658 flag_really_no_inline = flag_no_inline;
660 /* The optimization to partition hot and cold basic blocks into separate
661 sections of the .o and executable files does not work (currently)
662 with exception handling. If flag_exceptions is turned on we need to
663 turn off the partitioning optimization. */
665 if (flag_exceptions && flag_reorder_blocks_and_partition)
668 ("-freorder-blocks-and-partition does not work with exceptions");
669 flag_reorder_blocks_and_partition = 0;
670 flag_reorder_blocks = 1;
674 /* Handle target- and language-independent options. Return zero to
675 generate an "unknown option" message. */
677 common_handle_option (size_t scode, const char *arg,
678 int value ATTRIBUTE_UNUSED)
680 enum opt_code code = (enum opt_code) scode;
689 exit_after_options = true;
696 case OPT__target_help:
697 display_target_options ();
698 exit_after_options = true;
702 print_version (stderr, "");
703 exit_after_options = true;
707 g_switch_value = value;
713 /* Currently handled in a prescan. */
717 /* For backward compatibility, -W is the same as -Wextra. */
721 case OPT_Waggregate_return:
722 warn_aggregate_return = value;
725 case OPT_Wcast_align:
726 warn_cast_align = value;
729 case OPT_Wdeprecated_declarations:
730 warn_deprecated_decl = value;
733 case OPT_Wdisabled_optimization:
734 warn_disabled_optimization = value;
738 warnings_are_errors = value;
745 case OPT_Wfatal_errors:
746 flag_fatal_errors = value;
753 case OPT_Wlarger_than_:
754 larger_than_size = value;
755 warn_larger_than = value != -1;
758 case OPT_Wmissing_noreturn:
759 warn_missing_noreturn = value;
774 case OPT_Wstrict_aliasing:
775 case OPT_Wstrict_aliasing_:
776 warn_strict_aliasing = value;
783 case OPT_Wswitch_default:
784 warn_switch_default = value;
787 case OPT_Wswitch_enum:
788 warn_switch_enum = value;
791 case OPT_Wsystem_headers:
792 warn_system_headers = value;
795 case OPT_Wuninitialized:
796 warn_uninitialized = value;
799 case OPT_Wunreachable_code:
800 warn_notreached = value;
807 case OPT_Wunused_function:
808 warn_unused_function = value;
811 case OPT_Wunused_label:
812 warn_unused_label = value;
815 case OPT_Wunused_parameter:
816 warn_unused_parameter = value;
819 case OPT_Wunused_value:
820 warn_unused_value = value;
823 case OPT_Wunused_variable:
824 warn_unused_variable = value;
829 aux_info_file_name = arg;
830 flag_gen_aux_info = 1;
837 case OPT_auxbase_strip:
839 char *tmp = xstrdup (arg);
840 strip_off_ending (tmp, strlen (tmp));
847 decode_d_option (arg);
851 dump_base_name = arg;
855 flag_pic = value + value;
859 flag_pie = value + value;
862 case OPT_fabi_version_:
863 flag_abi_version = value;
866 case OPT_falign_functions:
867 align_functions = !value;
870 case OPT_falign_functions_:
871 align_functions = value;
874 case OPT_falign_jumps:
875 align_jumps = !value;
878 case OPT_falign_jumps_:
882 case OPT_falign_labels:
883 align_labels = !value;
886 case OPT_falign_labels_:
887 align_labels = value;
890 case OPT_falign_loops:
891 align_loops = !value;
894 case OPT_falign_loops_:
898 case OPT_fargument_alias:
899 flag_argument_noalias = !value;
902 case OPT_fargument_noalias:
903 flag_argument_noalias = value;
906 case OPT_fargument_noalias_global:
907 flag_argument_noalias = value + value;
910 case OPT_fasynchronous_unwind_tables:
911 flag_asynchronous_unwind_tables = value;
914 case OPT_fbounds_check:
915 flag_bounds_check = value;
918 case OPT_fbranch_count_reg:
919 flag_branch_on_count_reg = value;
922 case OPT_fbranch_probabilities:
923 flag_branch_probabilities_set = true;
924 flag_branch_probabilities = value;
927 case OPT_fbranch_target_load_optimize:
928 flag_branch_target_load_optimize = value;
931 case OPT_fbranch_target_load_optimize2:
932 flag_branch_target_load_optimize2 = value;
935 case OPT_fbtr_bb_exclusive:
936 flag_btr_bb_exclusive = value;
939 case OPT_fcall_used_:
940 fix_register (arg, 0, 1);
943 case OPT_fcall_saved_:
944 fix_register (arg, 0, 0);
947 case OPT_fcaller_saves:
948 flag_caller_saves = value;
952 flag_no_common = !value;
955 case OPT_fcprop_registers:
956 flag_cprop_registers = value;
959 case OPT_fcrossjumping:
960 flag_crossjumping = value;
963 case OPT_fcse_follow_jumps:
964 flag_cse_follow_jumps = value;
967 case OPT_fcse_skip_blocks:
968 flag_cse_skip_blocks = value;
971 case OPT_fdata_sections:
972 flag_data_sections = value;
976 flag_defer_pop = value;
979 case OPT_fdelayed_branch:
980 flag_delayed_branch = value;
983 case OPT_fdelete_null_pointer_checks:
984 flag_delete_null_pointer_checks = value;
987 case OPT_fdiagnostics_show_location_:
988 if (!strcmp (arg, "once"))
989 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
990 else if (!strcmp (arg, "every-line"))
991 diagnostic_prefixing_rule (global_dc)
992 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
997 case OPT_fdump_unnumbered:
998 flag_dump_unnumbered = value;
1001 case OPT_feliminate_dwarf2_dups:
1002 flag_eliminate_dwarf2_dups = value;
1005 case OPT_feliminate_unused_debug_types:
1006 flag_eliminate_unused_debug_types = value;
1009 case OPT_feliminate_unused_debug_symbols:
1010 flag_debug_only_used_symbols = value;
1013 case OPT_fexceptions:
1014 flag_exceptions = value;
1017 case OPT_fexpensive_optimizations:
1018 flag_expensive_optimizations = value;
1021 case OPT_ffast_math:
1022 set_fast_math_flags (value);
1025 case OPT_ffinite_math_only:
1026 flag_finite_math_only = value;
1030 fix_register (arg, 1, 1);
1033 case OPT_ffunction_cse:
1034 flag_no_function_cse = !value;
1037 case OPT_ffloat_store:
1038 flag_float_store = value;
1041 case OPT_fforce_addr:
1042 flag_force_addr = value;
1045 case OPT_fforce_mem:
1046 flag_force_mem = value;
1049 case OPT_ffunction_sections:
1050 flag_function_sections = value;
1058 flag_gcse_lm = value;
1062 flag_gcse_sm = value;
1065 case OPT_fgcse_after_reload:
1066 flag_gcse_after_reload = value;
1070 flag_gcse_las = value;
1073 case OPT_fguess_branch_probability:
1074 flag_guess_branch_prob = value;
1078 flag_no_ident = !value;
1081 case OPT_fif_conversion:
1082 flag_if_conversion = value;
1085 case OPT_fif_conversion2:
1086 flag_if_conversion2 = value;
1089 case OPT_finhibit_size_directive:
1090 flag_inhibit_size_directive = value;
1094 flag_no_inline = !value;
1097 case OPT_finline_functions:
1098 flag_inline_functions = value;
1101 case OPT_finline_limit_:
1102 case OPT_finline_limit_eq:
1103 set_param_value ("max-inline-insns-single", value / 2);
1104 set_param_value ("max-inline-insns-auto", value / 2);
1105 set_param_value ("max-inline-insns-rtl", value);
1108 case OPT_finstrument_functions:
1109 flag_instrument_function_entry_exit = value;
1112 case OPT_fkeep_inline_functions:
1113 flag_keep_inline_functions =value;
1116 case OPT_fkeep_static_consts:
1117 flag_keep_static_consts = value;
1120 case OPT_fleading_underscore:
1121 flag_leading_underscore = value;
1124 case OPT_floop_optimize:
1125 flag_loop_optimize = value;
1128 case OPT_fmath_errno:
1129 flag_errno_math = value;
1132 case OPT_fmem_report:
1136 case OPT_fmerge_all_constants:
1137 flag_merge_constants = value + value;
1140 case OPT_fmerge_constants:
1141 flag_merge_constants = value;
1144 case OPT_fmessage_length_:
1145 pp_set_line_maximum_length (global_dc->printer, value);
1148 case OPT_fmove_all_movables:
1149 flag_move_all_movables = value;
1153 flag_new_regalloc = value;
1156 case OPT_fnon_call_exceptions:
1157 flag_non_call_exceptions = value;
1160 case OPT_fold_unroll_all_loops:
1161 flag_old_unroll_all_loops = value;
1164 case OPT_fold_unroll_loops:
1165 flag_old_unroll_loops = value;
1168 case OPT_fomit_frame_pointer:
1169 flag_omit_frame_pointer = value;
1172 case OPT_foptimize_register_move:
1173 flag_regmove = value;
1176 case OPT_foptimize_sibling_calls:
1177 flag_optimize_sibling_calls = value;
1180 case OPT_fpack_struct:
1181 flag_pack_struct = value;
1184 case OPT_fpeel_loops:
1185 flag_peel_loops_set = true;
1186 flag_peel_loops = value;
1189 case OPT_fpcc_struct_return:
1190 flag_pcc_struct_return = value;
1194 flag_no_peephole = !value;
1197 case OPT_fpeephole2:
1198 flag_peephole2 = value;
1209 case OPT_fprefetch_loop_arrays:
1210 flag_prefetch_loop_arrays = value;
1214 profile_flag = value;
1217 case OPT_fprofile_arcs:
1218 profile_arc_flag_set = true;
1219 profile_arc_flag = value;
1222 case OPT_fprofile_use:
1223 if (!flag_branch_probabilities_set)
1224 flag_branch_probabilities = value;
1225 if (!flag_profile_values_set)
1226 flag_profile_values = value;
1227 if (!flag_unroll_loops_set)
1228 flag_unroll_loops = value;
1229 if (!flag_peel_loops_set)
1230 flag_peel_loops = value;
1231 if (!flag_tracer_set)
1232 flag_tracer = value;
1233 if (!flag_value_profile_transformations_set)
1234 flag_value_profile_transformations = value;
1237 case OPT_fprofile_generate:
1238 if (!profile_arc_flag_set)
1239 profile_arc_flag = value;
1240 if (!flag_profile_values_set)
1241 flag_profile_values = value;
1242 if (!flag_value_profile_transformations_set)
1243 flag_value_profile_transformations = value;
1246 case OPT_fprofile_values:
1247 flag_profile_values_set = true;
1248 flag_profile_values = value;
1252 flag_value_profile_transformations_set = value;
1253 flag_value_profile_transformations = value;
1256 case OPT_frandom_seed:
1257 /* The real switch is -fno-random-seed. */
1260 flag_random_seed = NULL;
1263 case OPT_frandom_seed_:
1264 flag_random_seed = arg;
1267 case OPT_freduce_all_givs:
1268 flag_reduce_all_givs = value;
1271 case OPT_freg_struct_return:
1272 flag_pcc_struct_return = !value;
1276 flag_regmove = value;
1279 case OPT_frename_registers:
1280 flag_rename_registers = value;
1283 case OPT_freorder_blocks:
1284 flag_reorder_blocks = value;
1287 case OPT_freorder_blocks_and_partition:
1288 flag_reorder_blocks_and_partition = value;
1291 case OPT_freorder_functions:
1292 flag_reorder_functions = value;
1295 case OPT_frerun_cse_after_loop:
1296 flag_rerun_cse_after_loop = value;
1299 case OPT_frerun_loop_opt:
1300 flag_rerun_loop_opt = value;
1303 case OPT_frounding_math:
1304 flag_rounding_math = value;
1307 case OPT_fsched_interblock:
1308 flag_schedule_interblock = value;
1311 case OPT_fsched_spec:
1312 flag_schedule_speculative = value;
1315 case OPT_fsched_spec_load:
1316 flag_schedule_speculative_load = value;
1319 case OPT_fsched_spec_load_dangerous:
1320 flag_schedule_speculative_load_dangerous = value;
1323 case OPT_fsched_verbose_:
1324 #ifdef INSN_SCHEDULING
1325 fix_sched_param ("verbose", arg);
1331 case OPT_fsched2_use_superblocks:
1332 flag_sched2_use_superblocks = value;
1335 case OPT_fsched2_use_traces:
1336 flag_sched2_use_traces = value;
1339 case OPT_fschedule_insns:
1340 flag_schedule_insns = value;
1343 case OPT_fschedule_insns2:
1344 flag_schedule_insns_after_reload = value;
1347 case OPT_fsched_stalled_insns:
1348 flag_sched_stalled_insns = value;
1351 case OPT_fsched_stalled_insns_:
1352 flag_sched_stalled_insns = value;
1353 if (flag_sched_stalled_insns == 0)
1354 flag_sched_stalled_insns = -1;
1357 case OPT_fsched_stalled_insns_dep:
1358 flag_sched_stalled_insns_dep = 1;
1361 case OPT_fsched_stalled_insns_dep_:
1362 flag_sched_stalled_insns_dep = value;
1365 case OPT_fshared_data:
1366 flag_shared_data = value;
1369 case OPT_fsignaling_nans:
1370 flag_signaling_nans = value;
1373 case OPT_fsingle_precision_constant:
1374 flag_single_precision_constant = value;
1377 case OPT_fstack_check:
1378 flag_stack_check = value;
1381 case OPT_fstack_limit:
1382 /* The real switch is -fno-stack-limit. */
1385 stack_limit_rtx = NULL_RTX;
1388 case OPT_fstack_limit_register_:
1390 int reg = decode_reg_name (arg);
1392 error ("unrecognized register name \"%s\"", arg);
1394 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1398 case OPT_fstack_limit_symbol_:
1399 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1402 case OPT_fstrength_reduce:
1403 flag_strength_reduce = value;
1406 case OPT_fstrict_aliasing:
1407 flag_strict_aliasing = value;
1410 case OPT_fsyntax_only:
1411 flag_syntax_only = value;
1414 case OPT_ftest_coverage:
1415 flag_test_coverage = value;
1418 case OPT_fthread_jumps:
1419 flag_thread_jumps = value;
1422 case OPT_ftime_report:
1423 time_report = value;
1426 case OPT_ftls_model_:
1427 if (!strcmp (arg, "global-dynamic"))
1428 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1429 else if (!strcmp (arg, "local-dynamic"))
1430 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1431 else if (!strcmp (arg, "initial-exec"))
1432 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1433 else if (!strcmp (arg, "local-exec"))
1434 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1436 warning ("unknown tls-model \"%s\"", arg);
1440 flag_tracer_set = true;
1441 flag_tracer = value;
1444 case OPT_ftrapping_math:
1445 flag_trapping_math = value;
1452 case OPT_funit_at_a_time:
1453 flag_unit_at_a_time = value;
1456 case OPT_funroll_all_loops:
1457 flag_unroll_all_loops = value;
1460 case OPT_funroll_loops:
1461 flag_unroll_loops_set = true;
1462 flag_unroll_loops = value;
1465 case OPT_funsafe_math_optimizations:
1466 flag_unsafe_math_optimizations = value;
1469 case OPT_funswitch_loops:
1470 flag_unswitch_loops = value;
1473 case OPT_funwind_tables:
1474 flag_unwind_tables = value;
1477 case OPT_fvar_tracking:
1478 flag_var_tracking = value;
1481 case OPT_fverbose_asm:
1482 flag_verbose_asm = value;
1493 case OPT_fzero_initialized_in_bss:
1494 flag_zero_initialized_in_bss = value;
1498 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1502 set_debug_level (SDB_DEBUG, false, arg);
1506 set_debug_level (DWARF2_DEBUG, false, arg);
1510 set_debug_level (NO_DEBUG, 2, arg);
1515 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1519 set_debug_level (VMS_DEBUG, false, arg);
1524 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1528 set_target_switch (arg);
1532 asm_file_name = arg;
1543 case OPT_pedantic_errors:
1544 flag_pedantic_errors = pedantic = 1;
1556 inhibit_warnings = true;
1563 /* Handle --param NAME=VALUE. */
1565 handle_param (const char *carg)
1570 arg = xstrdup (carg);
1571 equal = strchr (arg, '=');
1573 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1576 value = integral_argument (equal + 1);
1578 error ("invalid --param value `%s'", equal + 1);
1582 set_param_value (arg, value);
1589 /* Handle -W and -Wextra. */
1591 set_Wextra (int setting)
1593 extra_warnings = setting;
1594 warn_unused_value = setting;
1595 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1597 /* We save the value of warn_uninitialized, since if they put
1598 -Wuninitialized on the command line, we need to generate a
1599 warning about not using it without also specifying -O. */
1601 warn_uninitialized = 0;
1602 else if (warn_uninitialized != 1)
1603 warn_uninitialized = 2;
1606 /* Initialize unused warning flags. */
1608 set_Wunused (int setting)
1610 warn_unused_function = setting;
1611 warn_unused_label = setting;
1612 /* Unused function parameter warnings are reported when either
1613 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1614 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1615 otherwise set maybe_warn_extra_parameter, which will be picked up
1617 maybe_warn_unused_parameter = setting;
1618 warn_unused_parameter = (setting && extra_warnings);
1619 warn_unused_variable = setting;
1620 warn_unused_value = setting;
1623 /* The following routines are useful in setting all the flags that
1624 -ffast-math and -fno-fast-math imply. */
1626 set_fast_math_flags (int set)
1628 flag_trapping_math = !set;
1629 flag_unsafe_math_optimizations = set;
1630 flag_finite_math_only = set;
1631 flag_errno_math = !set;
1634 flag_signaling_nans = 0;
1635 flag_rounding_math = 0;
1639 /* Return true iff flags are set as if -ffast-math. */
1641 fast_math_flags_set_p (void)
1643 return (!flag_trapping_math
1644 && flag_unsafe_math_optimizations
1645 && flag_finite_math_only
1646 && !flag_errno_math);
1649 /* Handle a debug output -g switch. EXTENDED is true or false to support
1650 extended output (2 is special and means "-ggdb" was given). */
1652 set_debug_level (enum debug_info_type type, int extended, const char *arg)
1654 static bool type_explicit;
1656 use_gnu_debug_info_extensions = extended;
1658 if (type == NO_DEBUG)
1660 if (write_symbols == NO_DEBUG)
1662 write_symbols = PREFERRED_DEBUGGING_TYPE;
1666 #ifdef DWARF2_DEBUGGING_INFO
1667 write_symbols = DWARF2_DEBUG;
1668 #elif defined DBX_DEBUGGING_INFO
1669 write_symbols = DBX_DEBUG;
1673 if (write_symbols == NO_DEBUG)
1674 warning ("target system does not support debug output");
1679 /* Does it conflict with an already selected type? */
1680 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
1681 error ("debug format \"%s\" conflicts with prior selection",
1682 debug_type_names[type]);
1683 write_symbols = type;
1684 type_explicit = true;
1687 /* A debug flag without a level defaults to level 2. */
1690 if (!debug_info_level)
1691 debug_info_level = 2;
1695 debug_info_level = integral_argument (arg);
1696 if (debug_info_level == (unsigned int) -1)
1697 error ("unrecognised debug output level \"%s\"", arg);
1698 else if (debug_info_level > 3)
1699 error ("debug output level %s is too high", arg);
1703 /* Output --help text. */
1710 GET_ENVIRONMENT (p, "COLUMNS");
1713 int value = atoi (p);
1718 puts (_("The following options are language-independent:\n"));
1720 print_filtered_help (CL_COMMON);
1721 print_param_help ();
1723 for (i = 0; lang_names[i]; i++)
1725 printf (_("The %s front end recognizes the following options:\n\n"),
1727 print_filtered_help (1U << i);
1730 display_target_options ();
1733 /* Print the help for --param. */
1735 print_param_help (void)
1739 puts (_("The --param option recognizes the following as parameters:\n"));
1741 for (i = 0; i < LAST_PARAM; i++)
1743 const char *help = compiler_params[i].help;
1744 const char *param = compiler_params[i].option;
1746 if (help == NULL || *help == '\0')
1747 help = undocumented_msg;
1749 /* Get the translation. */
1752 wrap_help (help, param, strlen (param));
1758 /* Print help for a specific front-end, etc. */
1760 print_filtered_help (unsigned int flag)
1762 unsigned int i, len, filter, indent = 0;
1763 bool duplicates = false;
1764 const char *help, *opt, *tab;
1765 static char *printed;
1767 if (flag == CL_COMMON)
1771 printed = xmalloc (cl_options_count);
1772 memset (printed, 0, cl_options_count);
1776 /* Don't print COMMON options twice. */
1777 filter = flag | CL_COMMON;
1779 for (i = 0; i < cl_options_count; i++)
1781 if ((cl_options[i].flags & filter) != flag)
1784 /* Skip help for internal switches. */
1785 if (cl_options[i].flags & CL_UNDOCUMENTED)
1788 /* Skip switches that have already been printed, mark them to be
1793 indent = print_switch (cl_options[i].opt_text, indent);
1804 for (i = 0; i < cl_options_count; i++)
1806 if ((cl_options[i].flags & filter) != flag)
1809 /* Skip help for internal switches. */
1810 if (cl_options[i].flags & CL_UNDOCUMENTED)
1813 /* Skip switches that have already been printed. */
1819 help = cl_options[i].help;
1821 help = undocumented_msg;
1823 /* Get the translation. */
1826 tab = strchr (help, '\t');
1835 opt = cl_options[i].opt_text;
1839 wrap_help (help, opt, len);
1845 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1846 word-wrapped HELP in a second column. */
1848 print_switch (const char *text, unsigned int indent)
1850 unsigned int len = strlen (text) + 1; /* trailing comma */
1855 if (indent + len > columns)
1866 fputs (text, stdout);
1868 return indent + len + 1;
1871 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1872 word-wrapped HELP in a second column. */
1874 wrap_help (const char *help, const char *item, unsigned int item_width)
1876 unsigned int col_width = 27;
1877 unsigned int remaining, room, len;
1879 remaining = strlen (help);
1883 room = columns - 3 - MAX (col_width, item_width);
1892 for (i = 0; help[i]; i++)
1894 if (i >= room && len != remaining)
1898 else if ((help[i] == '-' || help[i] == '/')
1899 && help[i + 1] != ' '
1900 && i > 0 && ISALPHA (help[i - 1]))
1905 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1907 while (help[len] == ' ')