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
27 #include "coretypes.h"
33 #include "langhooks.h"
39 #include "diagnostic.h"
40 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
41 #include "insn-attr.h" /* For INSN_SCHEDULING. */
43 /* Value of the -G xx switch, and whether it was passed or not. */
44 unsigned HOST_WIDE_INT g_switch_value;
47 /* True if we should exit after parsing options. */
48 bool exit_after_options;
53 /* Print various extra warnings. -W/-Wextra. */
56 /* Don't print warning messages. -w. */
57 bool inhibit_warnings;
59 /* Treat warnings as errors. -Werror. */
60 bool warnings_are_errors;
62 /* Warn if a function returns an aggregate, since there are often
63 incompatible calling conventions for doing this. */
64 bool warn_aggregate_return;
66 /* Nonzero means warn about pointer casts that increase the required
67 alignment of the target type (and might therefore lead to a crash
68 due to a misaligned access). */
71 /* Nonzero means warn about uses of __attribute__((deprecated))
73 bool warn_deprecated_decl = true;
75 /* Warn when an optimization pass is disabled. */
76 bool warn_disabled_optimization;
78 /* Nonzero means warn if inline function is too large. */
81 /* True to warn about any objects definitions whose size is larger
82 than N bytes. Also want about function definitions whose returned
83 values are larger than N bytes, where N is `larger_than_size'. */
84 bool warn_larger_than;
85 HOST_WIDE_INT larger_than_size;
87 /* Warn about functions which might be candidates for attribute noreturn. */
88 bool warn_missing_noreturn;
90 /* True to warn about code which is never reached. */
93 /* Warn if packed attribute on struct is unnecessary and inefficient. */
96 /* Warn when gcc pads a structure to an alignment boundary. */
99 /* True means warn about all declarations which shadow others. */
102 /* Nonzero means warn about constructs which might not be
103 strict-aliasing safe. */
104 bool warn_strict_aliasing;
106 /* True to warn if a switch on an enum, that does not have a default
107 case, fails to have a case for every enum value. */
110 /* Warn if a switch does not have a default case. */
111 bool warn_switch_default;
113 /* Warn if a switch on an enum fails to have a case for every enum
114 value (regardless of the presence or otherwise of a default case). */
115 bool warn_switch_enum;
117 /* Don't suppress warnings from system headers. -Wsystem-headers. */
118 bool warn_system_headers;
120 /* True to warn about variables used before they are initialized. */
121 int warn_uninitialized;
123 /* True to warn about unused variables, functions et.al. */
124 bool warn_unused_function;
125 bool warn_unused_label;
126 bool warn_unused_parameter;
127 bool warn_unused_variable;
128 bool warn_unused_value;
130 /* Hack for cooperation between set_Wunused and set_Wextra. */
131 static bool maybe_warn_unused_parameter;
133 /* Type(s) of debugging information we are producing (if any). See
134 flags.h for the definitions of the different possible types of
135 debugging information. */
136 enum debug_info_type write_symbols = NO_DEBUG;
138 /* Level of debugging information we are producing. See flags.h for
139 the definitions of the different possible levels. */
140 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
142 /* Nonzero means use GNU-only extensions in the generated symbolic
143 debugging information. Currently, this only has an effect when
144 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
145 bool use_gnu_debug_info_extensions;
147 /* Columns of --help display. */
148 static unsigned int columns = 80;
150 /* What to print when a switch has no documentation. */
151 static const char undocumented_msg[] = N_("This switch lacks documentation");
153 /* Used for bookkeeping on whether user set these flags so
154 -fprofile-use/-fprofile-generate does not use them. */
155 static bool profile_arc_flag_set, flag_profile_values_set;
156 static bool flag_unroll_loops_set, flag_tracer_set;
157 static bool flag_value_profile_transformations_set;
158 static bool flag_peel_loops_set, flag_branch_probabilities_set;
160 /* Input file names. */
161 const char **in_fnames;
162 unsigned num_in_fnames;
164 static size_t find_opt (const char *, int);
165 static int common_handle_option (size_t scode, const char *arg, int value);
166 static void handle_param (const char *);
167 static void set_Wextra (int);
168 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
169 static char *write_langs (unsigned int lang_mask);
170 static void complain_wrong_lang (const char *, const struct cl_option *,
171 unsigned int lang_mask);
172 static void handle_options (unsigned int, const char **, unsigned int);
173 static void wrap_help (const char *help, const char *item, unsigned int);
174 static void print_help (void);
175 static void print_param_help (void);
176 static void print_filtered_help (unsigned int flag);
177 static unsigned int print_switch (const char *text, unsigned int indent);
178 static void set_debug_level (enum debug_info_type type, int extended,
181 /* Perform a binary search to find which option the command-line INPUT
182 matches. Returns its index in the option array, and N_OPTS
183 (cl_options_count) on failure.
185 This routine is quite subtle. A normal binary search is not good
186 enough because some options can be suffixed with an argument, and
187 multiple sub-matches can occur, e.g. input of "-pedantic" matching
188 the initial substring of "-pedantic-errors".
190 A more complicated example is -gstabs. It should match "-g" with
191 an argument of "stabs". Suppose, however, that the number and list
192 of switches are such that the binary search tests "-gen-decls"
193 before having tested "-g". This doesn't match, and as "-gen-decls"
194 is less than "-gstabs", it will become the lower bound of the
195 binary search range, and "-g" will never be seen. To resolve this
196 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
197 to "-g" so that failed searches that end between "-gen-decls" and
198 the lexicographically subsequent switch know to go back and see if
199 "-g" causes a match (which it does in this example).
201 This search is done in such a way that the longest match for the
202 front end in question wins. If there is no match for the current
203 front end, the longest match for a different front end is returned
204 (or N_OPTS if none) and the caller emits an error message. */
206 find_opt (const char *input, int lang_mask)
208 size_t mn, mx, md, opt_len;
209 size_t match_wrong_lang;
213 mx = cl_options_count;
215 /* Find mn such this lexicographical inequality holds:
216 cl_options[mn] <= input < cl_options[mn + 1]. */
220 opt_len = cl_options[md].opt_len;
221 comp = strncmp (input, cl_options[md].opt_text + 1, opt_len);
229 /* This is the switch that is the best match but for a different
230 front end, or cl_options_count if there is no match at all. */
231 match_wrong_lang = cl_options_count;
233 /* Backtrace the chain of possible matches, returning the longest
234 one, if any, that fits best. With current GCC switches, this
235 loop executes at most twice. */
238 const struct cl_option *opt = &cl_options[mn];
240 /* Is this switch a prefix of the input? */
241 if (!strncmp (input, opt->opt_text + 1, opt->opt_len))
243 /* If language is OK, and the match is exact or the switch
244 takes a joined argument, return it. */
245 if ((opt->flags & lang_mask)
246 && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
249 /* If we haven't remembered a prior match, remember this
250 one. Any prior match is necessarily better. */
251 if (match_wrong_lang == cl_options_count)
252 match_wrong_lang = mn;
255 /* Try the next possibility. This is cl_options_count if there
257 mn = opt->back_chain;
259 while (mn != cl_options_count);
261 /* Return the best wrong match, or cl_options_count if none. */
262 return match_wrong_lang;
265 /* If ARG is a non-negative integer made up solely of digits, return its
266 value, otherwise return -1. */
268 integral_argument (const char *arg)
272 while (*p && ISDIGIT (*p))
281 /* Return a malloced slash-separated list of languages in MASK. */
283 write_langs (unsigned int mask)
285 unsigned int n = 0, len = 0;
286 const char *lang_name;
289 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
290 if (mask & (1U << n))
291 len += strlen (lang_name) + 1;
293 result = xmalloc (len);
295 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
296 if (mask & (1U << n))
300 strcpy (result + len, lang_name);
301 len += strlen (lang_name);
309 /* Complain that switch OPT_INDEX does not apply to this front end. */
311 complain_wrong_lang (const char *text, const struct cl_option *option,
312 unsigned int lang_mask)
314 char *ok_langs, *bad_lang;
316 ok_langs = write_langs (option->flags);
317 bad_lang = write_langs (lang_mask);
319 /* Eventually this should become a hard error IMO. */
320 warning ("command line option \"%s\" is valid for %s but not for %s",
321 text, ok_langs, bad_lang);
327 /* Handle the switch beginning at ARGV for the language indicated by
328 LANG_MASK. Returns the number of switches consumed. */
330 handle_option (const char **argv, unsigned int lang_mask)
333 const char *opt, *arg = 0;
336 unsigned int result = 0;
337 const struct cl_option *option;
341 /* Drop the "no-" from negative switches. */
342 if ((opt[1] == 'W' || opt[1] == 'f')
343 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
345 size_t len = strlen (opt) - 3;
347 dup = xmalloc (len + 1);
350 memcpy (dup + 2, opt + 5, len - 2 + 1);
355 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON);
356 if (opt_index == cl_options_count)
359 option = &cl_options[opt_index];
361 /* Reject negative form of switches that don't take negatives as
363 if (!value && (option->flags & CL_REJECT_NEGATIVE))
366 /* We've recognized this switch. */
369 /* Sort out any argument the switch takes. */
370 if (option->flags & CL_JOINED)
372 /* Have arg point to the original switch. This is because
373 some code, such as disable_builtin_function, expects its
374 argument to be persistent until the program exits. */
375 arg = argv[0] + cl_options[opt_index].opt_len + 1;
377 arg += strlen ("no-");
379 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
381 if (option->flags & CL_SEPARATE)
387 /* Missing argument. */
391 else if (option->flags & CL_SEPARATE)
397 /* Now we've swallowed any potential argument, complain if this
398 is a switch for a different front end. */
399 if (!(option->flags & (lang_mask | CL_COMMON)))
401 complain_wrong_lang (argv[0], option, lang_mask);
405 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
407 if (!(*lang_hooks.missing_argument) (opt, opt_index))
408 error ("missing argument to \"%s\"", opt);
412 /* If the switch takes an integer, convert it. */
413 if (arg && (option->flags & CL_UINTEGER))
415 value = integral_argument (arg);
418 error ("argument to \"%s\" should be a non-negative integer",
424 if (option->flags & lang_mask)
425 if ((*lang_hooks.handle_option) (opt_index, arg, value) == 0)
428 if (result && (option->flags & CL_COMMON))
429 if (common_handle_option (opt_index, arg, value) == 0)
438 /* Decode and handle the vector of command line options. LANG_MASK
439 contains has a single bit set representing the current
442 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
446 for (i = 1; i < argc; i += n)
448 const char *opt = argv[i];
450 /* Interpret "-" or a non-switch as a file name. */
451 if (opt[0] != '-' || opt[1] == '\0')
453 if (main_input_filename == NULL)
454 main_input_filename = opt;
455 add_input_filename (opt);
460 n = handle_option (argv + i, lang_mask);
465 error ("unrecognized command line option \"%s\"", opt);
470 /* Handle FILENAME from the command line. */
472 add_input_filename (const char *filename)
475 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0]));
476 in_fnames[num_in_fnames - 1] = filename;
479 /* Parse command line options and set default flag values. Do minimal
480 options processing. */
482 decode_options (unsigned int argc, const char **argv)
484 unsigned int i, lang_mask;
486 /* Perform language-specific options initialization. */
487 lang_mask = (*lang_hooks.init_options) (argc, argv);
489 lang_hooks.initialize_diagnostics (global_dc);
491 /* Scan to see what optimization level has been specified. That will
492 determine the default value of many flags. */
493 for (i = 1; i < argc; i++)
495 if (!strcmp (argv[i], "-O"))
500 else if (argv[i][0] == '-' && argv[i][1] == 'O')
502 /* Handle -Os, -O2, -O3, -O69, ... */
503 const char *p = &argv[i][2];
505 if ((p[0] == 's') && (p[1] == 0))
509 /* Optimizing for size forces optimize to be 2. */
514 const int optimize_val = read_integral_parameter (p, p - 2, -1);
515 if (optimize_val != -1)
517 optimize = optimize_val;
526 flag_merge_constants = 0;
532 flag_thread_jumps = 1;
534 flag_delayed_branch = 1;
536 #ifdef CAN_DEBUG_WITHOUT_FP
537 flag_omit_frame_pointer = 1;
539 flag_guess_branch_prob = 1;
540 flag_cprop_registers = 1;
541 flag_loop_optimize = 1;
542 flag_if_conversion = 1;
543 flag_if_conversion2 = 1;
548 flag_crossjumping = 1;
549 flag_optimize_sibling_calls = 1;
550 flag_cse_follow_jumps = 1;
551 flag_cse_skip_blocks = 1;
553 flag_expensive_optimizations = 1;
554 flag_strength_reduce = 1;
555 flag_rerun_cse_after_loop = 1;
556 flag_rerun_loop_opt = 1;
557 flag_caller_saves = 1;
560 #ifdef INSN_SCHEDULING
561 flag_schedule_insns = 1;
562 flag_schedule_insns_after_reload = 1;
565 flag_strict_aliasing = 1;
566 flag_delete_null_pointer_checks = 1;
567 flag_reorder_blocks = 1;
568 flag_reorder_functions = 1;
569 flag_unit_at_a_time = 1;
574 flag_inline_functions = 1;
575 flag_rename_registers = 1;
576 flag_unswitch_loops = 1;
587 /* Don't reorder blocks when optimizing for size because extra
588 jump insns may be created; also barrier may create extra padding.
590 More correctly we should have a block reordering mode that tried
591 to minimize the combined size of all the jumps. This would more
592 or less automatically remove extra jumps, but would also try to
593 use more short jumps instead of long jumps. */
594 flag_reorder_blocks = 0;
597 /* Initialize whether `char' is signed. */
598 flag_signed_char = DEFAULT_SIGNED_CHAR;
599 #ifdef DEFAULT_SHORT_ENUMS
600 /* Initialize how much space enums occupy, by default. */
601 flag_short_enums = DEFAULT_SHORT_ENUMS;
604 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
607 set_target_switch ("");
609 /* Unwind tables are always present in an ABI-conformant IA-64
610 object file, so the default should be ON. */
611 #ifdef IA64_UNWIND_INFO
612 flag_unwind_tables = IA64_UNWIND_INFO;
615 #ifdef OPTIMIZATION_OPTIONS
616 /* Allow default optimizations to be specified on a per-machine basis. */
617 OPTIMIZATION_OPTIONS (optimize, optimize_size);
620 handle_options (argc, argv, lang_mask);
624 if (flag_pic && !flag_pie)
627 if (flag_no_inline == 2)
630 flag_really_no_inline = flag_no_inline;
632 /* Set flag_no_inline before the post_options () hook. The C front
633 ends use it to determine tree inlining defaults. FIXME: such
634 code should be lang-independent when all front ends use tree
635 inlining, in which case it, and this condition, should be moved
636 to the top of process_options() instead. */
639 /* Inlining does not work if not optimizing,
640 so force it not to be done. */
644 /* The c_decode_option function and decode_option hook set
645 this to `2' if -Wall is used, so we can avoid giving out
646 lots of errors for people who don't realize what -Wall does. */
647 if (warn_uninitialized == 1)
648 warning ("-Wuninitialized is not supported without -O");
651 if (flag_really_no_inline == 2)
652 flag_really_no_inline = flag_no_inline;
655 /* Handle target- and language-independent options. Return zero to
656 generate an "unknown option" message. */
658 common_handle_option (size_t scode, const char *arg,
659 int value ATTRIBUTE_UNUSED)
661 enum opt_code code = (enum opt_code) scode;
670 exit_after_options = true;
677 case OPT__target_help:
678 display_target_options ();
679 exit_after_options = true;
683 print_version (stderr, "");
684 exit_after_options = true;
688 g_switch_value = value;
694 /* Currently handled in a prescan. */
698 /* For backward compatibility, -W is the same as -Wextra. */
702 case OPT_Waggregate_return:
703 warn_aggregate_return = value;
706 case OPT_Wcast_align:
707 warn_cast_align = value;
710 case OPT_Wdeprecated_declarations:
711 warn_deprecated_decl = value;
714 case OPT_Wdisabled_optimization:
715 warn_disabled_optimization = value;
719 warnings_are_errors = value;
730 case OPT_Wlarger_than_:
731 larger_than_size = value;
732 warn_larger_than = value != -1;
735 case OPT_Wmissing_noreturn:
736 warn_missing_noreturn = value;
751 case OPT_Wstrict_aliasing:
752 warn_strict_aliasing = value;
759 case OPT_Wswitch_default:
760 warn_switch_default = value;
763 case OPT_Wswitch_enum:
764 warn_switch_enum = value;
767 case OPT_Wsystem_headers:
768 warn_system_headers = value;
771 case OPT_Wuninitialized:
772 warn_uninitialized = value;
775 case OPT_Wunreachable_code:
776 warn_notreached = value;
783 case OPT_Wunused_function:
784 warn_unused_function = value;
787 case OPT_Wunused_label:
788 warn_unused_label = value;
791 case OPT_Wunused_parameter:
792 warn_unused_parameter = value;
795 case OPT_Wunused_value:
796 warn_unused_value = value;
799 case OPT_Wunused_variable:
800 warn_unused_variable = value;
805 aux_info_file_name = arg;
806 flag_gen_aux_info = 1;
813 case OPT_auxbase_strip:
815 char *tmp = xstrdup (arg);
816 strip_off_ending (tmp, strlen (tmp));
823 decode_d_option (arg);
827 dump_base_name = arg;
831 flag_pic = value + value;
835 flag_pie = value + value;
838 case OPT_fabi_version_:
839 flag_abi_version = value;
842 case OPT_falign_functions:
843 align_functions = !value;
846 case OPT_falign_functions_:
847 align_functions = value;
850 case OPT_falign_jumps:
851 align_jumps = !value;
854 case OPT_falign_jumps_:
858 case OPT_falign_labels:
859 align_labels = !value;
862 case OPT_falign_labels_:
863 align_labels = value;
866 case OPT_falign_loops:
867 align_loops = !value;
870 case OPT_falign_loops_:
874 case OPT_fargument_alias:
875 flag_argument_noalias = !value;
878 case OPT_fargument_noalias:
879 flag_argument_noalias = value;
882 case OPT_fargument_noalias_global:
883 flag_argument_noalias = value + value;
886 case OPT_fasynchronous_unwind_tables:
887 flag_asynchronous_unwind_tables = value;
890 case OPT_fbounds_check:
891 flag_bounds_check = value;
894 case OPT_fbranch_count_reg:
895 flag_branch_on_count_reg = value;
898 case OPT_fbranch_probabilities:
899 flag_branch_probabilities_set = true;
900 flag_branch_probabilities = value;
903 case OPT_fbranch_target_load_optimize:
904 flag_branch_target_load_optimize = value;
907 case OPT_fbranch_target_load_optimize2:
908 flag_branch_target_load_optimize2 = value;
911 case OPT_fcall_used_:
912 fix_register (arg, 0, 1);
915 case OPT_fcall_saved_:
916 fix_register (arg, 0, 0);
919 case OPT_fcaller_saves:
920 flag_caller_saves = value;
924 flag_no_common = !value;
927 case OPT_fcprop_registers:
928 flag_cprop_registers = value;
931 case OPT_fcrossjumping:
932 flag_crossjumping = value;
935 case OPT_fcse_follow_jumps:
936 flag_cse_follow_jumps = value;
939 case OPT_fcse_skip_blocks:
940 flag_cse_skip_blocks = value;
943 case OPT_fdata_sections:
944 flag_data_sections = value;
948 flag_defer_pop = value;
951 case OPT_fdelayed_branch:
952 flag_delayed_branch = value;
955 case OPT_fdelete_null_pointer_checks:
956 flag_delete_null_pointer_checks = value;
959 case OPT_fdiagnostics_show_location_:
960 if (!strcmp (arg, "once"))
961 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
962 else if (!strcmp (arg, "every-line"))
963 diagnostic_prefixing_rule (global_dc)
964 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
969 case OPT_fdump_unnumbered:
970 flag_dump_unnumbered = value;
973 case OPT_feliminate_dwarf2_dups:
974 flag_eliminate_dwarf2_dups = value;
977 case OPT_feliminate_unused_debug_types:
978 flag_eliminate_unused_debug_types = value;
981 case OPT_feliminate_unused_debug_symbols:
982 flag_debug_only_used_symbols = value;
985 case OPT_fexceptions:
986 flag_exceptions = value;
989 case OPT_fexpensive_optimizations:
990 flag_expensive_optimizations = value;
994 set_fast_math_flags (value);
997 case OPT_ffinite_math_only:
998 flag_finite_math_only = value;
1002 fix_register (arg, 1, 1);
1005 case OPT_ffunction_cse:
1006 flag_no_function_cse = !value;
1009 case OPT_ffloat_store:
1010 flag_float_store = value;
1013 case OPT_fforce_addr:
1014 flag_force_addr = value;
1017 case OPT_fforce_mem:
1018 flag_force_mem = value;
1021 case OPT_ffunction_sections:
1022 flag_function_sections = value;
1030 flag_gcse_lm = value;
1034 flag_gcse_sm = value;
1038 flag_gcse_las = value;
1041 case OPT_fguess_branch_probability:
1042 flag_guess_branch_prob = value;
1046 flag_no_ident = !value;
1049 case OPT_fif_conversion:
1050 flag_if_conversion = value;
1053 case OPT_fif_conversion2:
1054 flag_if_conversion2 = value;
1057 case OPT_finhibit_size_directive:
1058 flag_inhibit_size_directive = value;
1062 flag_no_inline = !value;
1065 case OPT_finline_functions:
1066 flag_inline_functions = value;
1069 case OPT_finline_limit_:
1070 case OPT_finline_limit_eq:
1071 set_param_value ("max-inline-insns-single", value / 2);
1072 set_param_value ("max-inline-insns-auto", value / 2);
1073 set_param_value ("max-inline-insns-rtl", value);
1076 case OPT_finstrument_functions:
1077 flag_instrument_function_entry_exit = value;
1080 case OPT_fkeep_inline_functions:
1081 flag_keep_inline_functions =value;
1084 case OPT_fkeep_static_consts:
1085 flag_keep_static_consts = value;
1088 case OPT_fleading_underscore:
1089 flag_leading_underscore = value;
1092 case OPT_floop_optimize:
1093 flag_loop_optimize = value;
1096 case OPT_fmath_errno:
1097 flag_errno_math = value;
1100 case OPT_fmem_report:
1104 case OPT_fmerge_all_constants:
1105 flag_merge_constants = value + value;
1108 case OPT_fmerge_constants:
1109 flag_merge_constants = value;
1112 case OPT_fmessage_length_:
1113 pp_set_line_maximum_length (global_dc->printer, value);
1116 case OPT_fmove_all_movables:
1117 flag_move_all_movables = value;
1121 flag_new_regalloc = value;
1124 case OPT_fnon_call_exceptions:
1125 flag_non_call_exceptions = value;
1128 case OPT_fold_unroll_all_loops:
1129 flag_old_unroll_all_loops = value;
1132 case OPT_fold_unroll_loops:
1133 flag_old_unroll_loops = value;
1136 case OPT_fomit_frame_pointer:
1137 flag_omit_frame_pointer = value;
1140 case OPT_foptimize_register_move:
1141 flag_regmove = value;
1144 case OPT_foptimize_sibling_calls:
1145 flag_optimize_sibling_calls = value;
1148 case OPT_fpack_struct:
1149 flag_pack_struct = value;
1152 case OPT_fpeel_loops:
1153 flag_peel_loops_set = true;
1154 flag_peel_loops = value;
1157 case OPT_fpcc_struct_return:
1158 flag_pcc_struct_return = value;
1162 flag_no_peephole = !value;
1165 case OPT_fpeephole2:
1166 flag_peephole2 = value;
1177 case OPT_fprefetch_loop_arrays:
1178 flag_prefetch_loop_arrays = value;
1182 profile_flag = value;
1185 case OPT_fprofile_arcs:
1186 profile_arc_flag_set = true;
1187 profile_arc_flag = value;
1190 case OPT_fprofile_use:
1191 if (!flag_branch_probabilities_set)
1192 flag_branch_probabilities = value;
1193 if (!flag_profile_values_set)
1194 flag_profile_values = value;
1195 if (!flag_unroll_loops_set)
1196 flag_unroll_loops = value;
1197 if (!flag_peel_loops_set)
1198 flag_peel_loops = value;
1199 if (!flag_tracer_set)
1200 flag_tracer = value;
1201 if (!flag_value_profile_transformations_set)
1202 flag_value_profile_transformations = value;
1205 case OPT_fprofile_generate:
1206 if (!profile_arc_flag_set)
1207 profile_arc_flag = value;
1208 if (!flag_profile_values_set)
1209 flag_profile_values = value;
1210 if (!flag_value_profile_transformations_set)
1211 flag_value_profile_transformations = value;
1214 case OPT_fprofile_values:
1215 flag_profile_values_set = true;
1216 flag_profile_values = value;
1220 flag_value_profile_transformations_set = value;
1221 flag_value_profile_transformations = value;
1224 case OPT_frandom_seed:
1225 /* The real switch is -fno-random-seed. */
1228 flag_random_seed = NULL;
1231 case OPT_frandom_seed_:
1232 flag_random_seed = arg;
1235 case OPT_freduce_all_givs:
1236 flag_reduce_all_givs = value;
1239 case OPT_freg_struct_return:
1240 flag_pcc_struct_return = !value;
1244 flag_regmove = value;
1247 case OPT_frename_registers:
1248 flag_rename_registers = value;
1251 case OPT_freorder_blocks:
1252 flag_reorder_blocks = value;
1255 case OPT_freorder_functions:
1256 flag_reorder_functions = value;
1259 case OPT_frerun_cse_after_loop:
1260 flag_rerun_cse_after_loop = value;
1263 case OPT_frerun_loop_opt:
1264 flag_rerun_loop_opt = value;
1267 case OPT_frounding_math:
1268 flag_rounding_math = value;
1271 case OPT_fsched_interblock:
1272 flag_schedule_interblock = value;
1275 case OPT_fsched_spec:
1276 flag_schedule_speculative = value;
1279 case OPT_fsched_spec_load:
1280 flag_schedule_speculative_load = value;
1283 case OPT_fsched_spec_load_dangerous:
1284 flag_schedule_speculative_load_dangerous = value;
1287 case OPT_fsched_verbose_:
1288 #ifdef INSN_SCHEDULING
1289 fix_sched_param ("verbose", arg);
1295 case OPT_fsched2_use_superblocks:
1296 flag_sched2_use_superblocks = value;
1299 case OPT_fsched2_use_traces:
1300 flag_sched2_use_traces = value;
1303 case OPT_fschedule_insns:
1304 flag_schedule_insns = value;
1307 case OPT_fschedule_insns2:
1308 flag_schedule_insns_after_reload = value;
1311 case OPT_fsched_stalled_insns:
1312 flag_sched_stalled_insns = value;
1315 case OPT_fsched_stalled_insns_:
1316 flag_sched_stalled_insns = value;
1317 if (flag_sched_stalled_insns == 0)
1318 flag_sched_stalled_insns = -1;
1321 case OPT_fsched_stalled_insns_dep:
1322 flag_sched_stalled_insns_dep = 1;
1325 case OPT_fsched_stalled_insns_dep_:
1326 flag_sched_stalled_insns_dep = value;
1329 case OPT_fshared_data:
1330 flag_shared_data = value;
1333 case OPT_fsignaling_nans:
1334 flag_signaling_nans = value;
1337 case OPT_fsingle_precision_constant:
1338 flag_single_precision_constant = value;
1341 case OPT_fstack_check:
1342 flag_stack_check = value;
1345 case OPT_fstack_limit:
1346 /* The real switch is -fno-stack-limit. */
1349 stack_limit_rtx = NULL_RTX;
1352 case OPT_fstack_limit_register_:
1354 int reg = decode_reg_name (arg);
1356 error ("unrecognized register name \"%s\"", arg);
1358 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1362 case OPT_fstack_limit_symbol_:
1363 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1366 case OPT_fstrength_reduce:
1367 flag_strength_reduce = value;
1370 case OPT_fstrict_aliasing:
1371 flag_strict_aliasing = value;
1374 case OPT_fsyntax_only:
1375 flag_syntax_only = value;
1378 case OPT_ftest_coverage:
1379 flag_test_coverage = value;
1382 case OPT_fthread_jumps:
1383 flag_thread_jumps = value;
1386 case OPT_ftime_report:
1387 time_report = value;
1390 case OPT_ftls_model_:
1391 if (!strcmp (arg, "global-dynamic"))
1392 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1393 else if (!strcmp (arg, "local-dynamic"))
1394 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1395 else if (!strcmp (arg, "initial-exec"))
1396 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1397 else if (!strcmp (arg, "local-exec"))
1398 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1400 warning ("unknown tls-model \"%s\"", arg);
1404 flag_tracer_set = true;
1405 flag_tracer = value;
1408 case OPT_ftrapping_math:
1409 flag_trapping_math = value;
1416 case OPT_funit_at_a_time:
1417 flag_unit_at_a_time = value;
1420 case OPT_funroll_all_loops:
1421 flag_unroll_all_loops = value;
1424 case OPT_funroll_loops:
1425 flag_unroll_loops_set = true;
1426 flag_unroll_loops = value;
1429 case OPT_funsafe_math_optimizations:
1430 flag_unsafe_math_optimizations = value;
1433 case OPT_funswitch_loops:
1434 flag_unswitch_loops = value;
1437 case OPT_funwind_tables:
1438 flag_unwind_tables = value;
1441 case OPT_fverbose_asm:
1442 flag_verbose_asm = value;
1453 case OPT_fwritable_strings:
1454 flag_writable_strings = value;
1455 if (flag_writable_strings)
1456 inform ("-fwritable-strings is deprecated; "
1457 "see documentation for details");
1460 case OPT_fzero_initialized_in_bss:
1461 flag_zero_initialized_in_bss = value;
1465 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1469 set_debug_level (SDB_DEBUG, false, arg);
1473 set_debug_level (DWARF2_DEBUG, false, arg);
1477 set_debug_level (NO_DEBUG, 2, arg);
1482 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1486 set_debug_level (VMS_DEBUG, false, arg);
1491 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1495 set_target_switch (arg);
1499 asm_file_name = arg;
1510 case OPT_pedantic_errors:
1511 flag_pedantic_errors = pedantic = 1;
1523 inhibit_warnings = true;
1530 /* Handle --param NAME=VALUE. */
1532 handle_param (const char *carg)
1537 arg = xstrdup (carg);
1538 equal = strchr (arg, '=');
1540 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1543 value = integral_argument (equal + 1);
1545 error ("invalid --param value `%s'", equal + 1);
1549 set_param_value (arg, value);
1556 /* Handle -W and -Wextra. */
1558 set_Wextra (int setting)
1560 extra_warnings = setting;
1561 warn_unused_value = setting;
1562 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1564 /* We save the value of warn_uninitialized, since if they put
1565 -Wuninitialized on the command line, we need to generate a
1566 warning about not using it without also specifying -O. */
1568 warn_uninitialized = 0;
1569 else if (warn_uninitialized != 1)
1570 warn_uninitialized = 2;
1573 /* Initialize unused warning flags. */
1575 set_Wunused (int setting)
1577 warn_unused_function = setting;
1578 warn_unused_label = setting;
1579 /* Unused function parameter warnings are reported when either
1580 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1581 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1582 otherwise set maybe_warn_extra_parameter, which will be picked up
1584 maybe_warn_unused_parameter = setting;
1585 warn_unused_parameter = (setting && extra_warnings);
1586 warn_unused_variable = setting;
1587 warn_unused_value = setting;
1590 /* The following routines are useful in setting all the flags that
1591 -ffast-math and -fno-fast-math imply. */
1593 set_fast_math_flags (int set)
1595 flag_trapping_math = !set;
1596 flag_unsafe_math_optimizations = set;
1597 flag_finite_math_only = set;
1598 flag_errno_math = !set;
1601 flag_signaling_nans = 0;
1602 flag_rounding_math = 0;
1606 /* Return true iff flags are set as if -ffast-math. */
1608 fast_math_flags_set_p (void)
1610 return (!flag_trapping_math
1611 && flag_unsafe_math_optimizations
1612 && flag_finite_math_only
1613 && !flag_errno_math);
1616 /* Handle a debug output -g switch. EXTENDED is true or false to support
1617 extended output (2 is special and means "-ggdb" was given). */
1619 set_debug_level (enum debug_info_type type, int extended, const char *arg)
1621 static bool type_explicit;
1623 use_gnu_debug_info_extensions = extended;
1625 if (type == NO_DEBUG)
1627 if (write_symbols == NO_DEBUG)
1629 write_symbols = PREFERRED_DEBUGGING_TYPE;
1633 #ifdef DWARF2_DEBUGGING_INFO
1634 write_symbols = DWARF2_DEBUG;
1635 #elif defined DBX_DEBUGGING_INFO
1636 write_symbols = DBX_DEBUG;
1640 if (write_symbols == NO_DEBUG)
1641 warning ("target system does not support debug output");
1646 /* Does it conflict with an already selected type? */
1647 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
1648 error ("debug format \"%s\" conflicts with prior selection",
1649 debug_type_names[type]);
1650 write_symbols = type;
1651 type_explicit = true;
1654 /* A debug flag without a level defaults to level 2. */
1657 if (!debug_info_level)
1658 debug_info_level = 2;
1662 debug_info_level = integral_argument (arg);
1663 if (debug_info_level == (unsigned int) -1)
1664 error ("unrecognised debug output level \"%s\"", arg);
1665 else if (debug_info_level > 3)
1666 error ("debug output level %s is too high", arg);
1670 /* Output --help text. */
1677 GET_ENVIRONMENT (p, "COLUMNS");
1680 int value = atoi (p);
1685 puts (_("The following options are language-independent:\n"));
1687 print_filtered_help (CL_COMMON);
1688 print_param_help ();
1690 for (i = 0; lang_names[i]; i++)
1692 printf (_("The %s front end recognizes the following options:\n\n"),
1694 print_filtered_help (1U << i);
1697 display_target_options ();
1700 /* Print the help for --param. */
1702 print_param_help (void)
1706 puts (_("The --param option recognizes the following as parameters:\n"));
1708 for (i = 0; i < LAST_PARAM; i++)
1710 const char *help = compiler_params[i].help;
1711 const char *param = compiler_params[i].option;
1713 if (help == NULL || *help == '\0')
1714 help = undocumented_msg;
1716 /* Get the translation. */
1719 wrap_help (help, param, strlen (param));
1725 /* Print help for a specific front-end, etc. */
1727 print_filtered_help (unsigned int flag)
1729 unsigned int i, len, filter, indent = 0;
1730 bool duplicates = false;
1731 const char *help, *opt, *tab;
1732 static char *printed;
1734 if (flag == CL_COMMON)
1738 printed = xmalloc (cl_options_count);
1739 memset (printed, 0, cl_options_count);
1743 /* Don't print COMMON options twice. */
1744 filter = flag | CL_COMMON;
1746 for (i = 0; i < cl_options_count; i++)
1748 if ((cl_options[i].flags & filter) != flag)
1751 /* Skip help for internal switches. */
1752 if (cl_options[i].flags & CL_UNDOCUMENTED)
1755 /* Skip switches that have already been printed, mark them to be
1760 indent = print_switch (cl_options[i].opt_text, indent);
1771 for (i = 0; i < cl_options_count; i++)
1773 if ((cl_options[i].flags & filter) != flag)
1776 /* Skip help for internal switches. */
1777 if (cl_options[i].flags & CL_UNDOCUMENTED)
1780 /* Skip switches that have already been printed. */
1786 help = cl_options[i].help;
1788 help = undocumented_msg;
1790 /* Get the translation. */
1793 tab = strchr (help, '\t');
1802 opt = cl_options[i].opt_text;
1806 wrap_help (help, opt, len);
1812 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1813 word-wrapped HELP in a second column. */
1815 print_switch (const char *text, unsigned int indent)
1817 unsigned int len = strlen (text) + 1; /* trailing comma */
1822 if (indent + len > columns)
1833 fputs (text, stdout);
1835 return indent + len + 1;
1838 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1839 word-wrapped HELP in a second column. */
1841 wrap_help (const char *help, const char *item, unsigned int item_width)
1843 unsigned int col_width = 27;
1844 unsigned int remaining, room, len;
1846 remaining = strlen (help);
1850 room = columns - 3 - MAX (col_width, item_width);
1859 for (i = 0; help[i]; i++)
1861 if (i >= room && len != remaining)
1865 else if ((help[i] == '-' || help[i] == '/')
1866 && help[i + 1] != ' '
1867 && i > 0 && ISALPHA (help[i - 1]))
1872 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1874 while (help[len] == ' ')