1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
26 #include "coretypes.h"
32 #include "langhooks.h"
38 #include "diagnostic.h"
39 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "tree-pass.h"
44 /* Value of the -G xx switch, and whether it was passed or not. */
45 unsigned HOST_WIDE_INT g_switch_value;
48 /* True if we should exit after parsing options. */
49 bool exit_after_options;
51 /* Print various extra warnings. -W/-Wextra. */
54 /* True to warn about any objects definitions whose size is larger
55 than N bytes. Also want about function definitions whose returned
56 values are larger than N bytes, where N is `larger_than_size'. */
57 bool warn_larger_than;
58 HOST_WIDE_INT larger_than_size;
60 /* Nonzero means warn about constructs which might not be
61 strict-aliasing safe. */
62 int warn_strict_aliasing;
64 /* Nonzero means warn about optimizations which rely on undefined
66 int warn_strict_overflow;
68 /* Hack for cooperation between set_Wunused and set_Wextra. */
69 static bool maybe_warn_unused_parameter;
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 /* Nonzero means use GNU-only extensions in the generated symbolic
81 debugging information. Currently, this only has an effect when
82 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
83 bool use_gnu_debug_info_extensions;
85 /* The default visibility for all symbols (unless overridden) */
86 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
88 /* Disable unit-at-a-time for frontends that might be still broken in this
91 bool no_unit_at_a_time_default;
93 /* Global visibility options. */
94 struct visibility_flags visibility_options;
96 /* What to print when a switch has no documentation. */
97 static const char undocumented_msg[] = N_("This switch lacks documentation");
99 /* Used for bookkeeping on whether user set these flags so
100 -fprofile-use/-fprofile-generate does not use them. */
101 static bool profile_arc_flag_set, flag_profile_values_set;
102 static bool flag_unroll_loops_set, flag_tracer_set;
103 static bool flag_value_profile_transformations_set;
104 static bool flag_peel_loops_set, flag_branch_probabilities_set;
106 /* Input file names. */
107 const char **in_fnames;
108 unsigned num_in_fnames;
110 static int common_handle_option (size_t scode, const char *arg, int value,
111 unsigned int lang_mask);
112 static void handle_param (const char *);
113 static void set_Wextra (int);
114 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
115 static char *write_langs (unsigned int lang_mask);
116 static void complain_wrong_lang (const char *, const struct cl_option *,
117 unsigned int lang_mask);
118 static void handle_options (unsigned int, const char **, unsigned int);
119 static void set_debug_level (enum debug_info_type type, int extended,
122 /* If ARG is a non-negative integer made up solely of digits, return its
123 value, otherwise return -1. */
125 integral_argument (const char *arg)
129 while (*p && ISDIGIT (*p))
138 /* Return a malloced slash-separated list of languages in MASK. */
140 write_langs (unsigned int mask)
142 unsigned int n = 0, len = 0;
143 const char *lang_name;
146 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
147 if (mask & (1U << n))
148 len += strlen (lang_name) + 1;
150 result = XNEWVEC (char, len);
152 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
153 if (mask & (1U << n))
157 strcpy (result + len, lang_name);
158 len += strlen (lang_name);
166 /* Complain that switch OPT_INDEX does not apply to this front end. */
168 complain_wrong_lang (const char *text, const struct cl_option *option,
169 unsigned int lang_mask)
171 char *ok_langs, *bad_lang;
173 ok_langs = write_langs (option->flags);
174 bad_lang = write_langs (lang_mask);
176 /* Eventually this should become a hard error IMO. */
177 warning (0, "command line option \"%s\" is valid for %s but not for %s",
178 text, ok_langs, bad_lang);
184 /* Handle the switch beginning at ARGV for the language indicated by
185 LANG_MASK. Returns the number of switches consumed. */
187 handle_option (const char **argv, unsigned int lang_mask)
190 const char *opt, *arg = 0;
193 unsigned int result = 0;
194 const struct cl_option *option;
198 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
199 if (opt_index == cl_options_count
200 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
201 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
203 /* Drop the "no-" from negative switches. */
204 size_t len = strlen (opt) - 3;
206 dup = XNEWVEC (char, len + 1);
209 memcpy (dup + 2, opt + 5, len - 2 + 1);
212 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
215 if (opt_index == cl_options_count)
218 option = &cl_options[opt_index];
220 /* Reject negative form of switches that don't take negatives as
222 if (!value && (option->flags & CL_REJECT_NEGATIVE))
225 /* We've recognized this switch. */
228 /* Check to see if the option is disabled for this configuration. */
229 if (option->flags & CL_DISABLED)
231 error ("command line option %qs"
232 " is not supported by this configuration", opt);
236 /* Sort out any argument the switch takes. */
237 if (option->flags & CL_JOINED)
239 /* Have arg point to the original switch. This is because
240 some code, such as disable_builtin_function, expects its
241 argument to be persistent until the program exits. */
242 arg = argv[0] + cl_options[opt_index].opt_len + 1;
244 arg += strlen ("no-");
246 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
248 if (option->flags & CL_SEPARATE)
254 /* Missing argument. */
258 else if (option->flags & CL_SEPARATE)
264 /* Now we've swallowed any potential argument, complain if this
265 is a switch for a different front end. */
266 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
268 complain_wrong_lang (argv[0], option, lang_mask);
272 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
274 if (!lang_hooks.missing_argument (opt, opt_index))
275 error ("missing argument to \"%s\"", opt);
279 /* If the switch takes an integer, convert it. */
280 if (arg && (option->flags & CL_UINTEGER))
282 value = integral_argument (arg);
285 error ("argument to \"%s\" should be a non-negative integer",
291 if (option->flag_var)
292 switch (option->var_type)
295 *(int *) option->flag_var = value;
299 *(int *) option->flag_var = (value
301 : !option->var_value);
306 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
307 *(int *) option->flag_var |= option->var_value;
309 *(int *) option->flag_var &= ~option->var_value;
310 if (option->flag_var == &target_flags)
311 target_flags_explicit |= option->var_value;
315 *(const char **) option->flag_var = arg;
319 if (option->flags & lang_mask)
320 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
323 if (result && (option->flags & CL_COMMON))
324 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
327 if (result && (option->flags & CL_TARGET))
328 if (!targetm.handle_option (opt_index, arg, value))
337 /* Handle FILENAME from the command line. */
339 add_input_filename (const char *filename)
342 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0]));
343 in_fnames[num_in_fnames - 1] = filename;
346 /* Decode and handle the vector of command line options. LANG_MASK
347 contains has a single bit set representing the current
350 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
354 for (i = 1; i < argc; i += n)
356 const char *opt = argv[i];
358 /* Interpret "-" or a non-switch as a file name. */
359 if (opt[0] != '-' || opt[1] == '\0')
361 if (main_input_filename == NULL)
362 main_input_filename = opt;
363 add_input_filename (opt);
368 n = handle_option (argv + i, lang_mask);
373 error ("unrecognized command line option \"%s\"", opt);
378 /* Parse command line options and set default flag values. Do minimal
379 options processing. */
381 decode_options (unsigned int argc, const char **argv)
383 unsigned int i, lang_mask;
385 /* Perform language-specific options initialization. */
386 lang_mask = lang_hooks.init_options (argc, argv);
388 lang_hooks.initialize_diagnostics (global_dc);
390 /* Scan to see what optimization level has been specified. That will
391 determine the default value of many flags. */
392 for (i = 1; i < argc; i++)
394 if (!strcmp (argv[i], "-O"))
399 else if (argv[i][0] == '-' && argv[i][1] == 'O')
401 /* Handle -Os, -O2, -O3, -O69, ... */
402 const char *p = &argv[i][2];
404 if ((p[0] == 's') && (p[1] == 0))
408 /* Optimizing for size forces optimize to be 2. */
413 const int optimize_val = read_integral_parameter (p, p - 2, -1);
414 if (optimize_val != -1)
416 optimize = optimize_val;
425 flag_merge_constants = 0;
432 flag_delayed_branch = 1;
434 #ifdef CAN_DEBUG_WITHOUT_FP
435 flag_omit_frame_pointer = 1;
437 flag_guess_branch_prob = 1;
438 flag_cprop_registers = 1;
439 flag_if_conversion = 1;
440 flag_if_conversion2 = 1;
441 flag_ipa_pure_const = 1;
442 flag_ipa_reference = 1;
443 flag_split_wide_types = 1;
450 flag_tree_copyrename = 1;
452 flag_tree_copy_prop = 1;
454 flag_tree_salias = 1;
455 if (!no_unit_at_a_time_default)
456 flag_unit_at_a_time = 1;
460 /* Loop header copying usually increases size of the code. This used
461 not to be true, since quite often it is possible to verify that
462 the condition is satisfied in the first iteration and therefore
463 to eliminate it. Jump threading handles these cases now. */
470 flag_thread_jumps = 1;
471 flag_crossjumping = 1;
472 flag_optimize_sibling_calls = 1;
473 flag_forward_propagate = 1;
474 flag_cse_follow_jumps = 1;
476 flag_expensive_optimizations = 1;
477 flag_ipa_type_escape = 1;
478 flag_rerun_cse_after_loop = 1;
479 flag_caller_saves = 1;
481 #ifdef INSN_SCHEDULING
482 flag_schedule_insns = 1;
483 flag_schedule_insns_after_reload = 1;
486 flag_strict_aliasing = 1;
487 flag_strict_overflow = 1;
488 flag_delete_null_pointer_checks = 1;
489 flag_reorder_blocks = 1;
490 flag_reorder_functions = 1;
491 flag_tree_store_ccp = 1;
492 flag_tree_store_copy_prop = 1;
497 /* PRE tends to generate bigger code. */
504 flag_inline_functions = 1;
505 flag_unswitch_loops = 1;
506 flag_gcse_after_reload = 1;
509 if (optimize < 2 || optimize_size)
516 /* Don't reorder blocks when optimizing for size because extra
517 jump insns may be created; also barrier may create extra padding.
519 More correctly we should have a block reordering mode that tried
520 to minimize the combined size of all the jumps. This would more
521 or less automatically remove extra jumps, but would also try to
522 use more short jumps instead of long jumps. */
523 flag_reorder_blocks = 0;
524 flag_reorder_blocks_and_partition = 0;
529 /* Inlining of very small functions usually reduces total size. */
530 set_param_value ("max-inline-insns-single", 5);
531 set_param_value ("max-inline-insns-auto", 5);
532 flag_inline_functions = 1;
534 /* We want to crossjump as much as possible. */
535 set_param_value ("min-crossjump-insns", 1);
538 /* Initialize whether `char' is signed. */
539 flag_signed_char = DEFAULT_SIGNED_CHAR;
540 /* Set this to a special "uninitialized" value. The actual default is set
541 after target options have been processed. */
542 flag_short_enums = 2;
544 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
546 target_flags = targetm.default_target_flags;
548 /* Some tagets have ABI-specified unwind tables. */
549 flag_unwind_tables = targetm.unwind_tables_default;
551 #ifdef OPTIMIZATION_OPTIONS
552 /* Allow default optimizations to be specified on a per-machine basis. */
553 OPTIMIZATION_OPTIONS (optimize, optimize_size);
556 handle_options (argc, argv, lang_mask);
560 if (flag_pic && !flag_pie)
563 if (flag_no_inline == 2)
566 flag_really_no_inline = flag_no_inline;
568 /* Set flag_no_inline before the post_options () hook. The C front
569 ends use it to determine tree inlining defaults. FIXME: such
570 code should be lang-independent when all front ends use tree
571 inlining, in which case it, and this condition, should be moved
572 to the top of process_options() instead. */
575 /* Inlining does not work if not optimizing,
576 so force it not to be done. */
580 /* The c_decode_option function and decode_option hook set
581 this to `2' if -Wall is used, so we can avoid giving out
582 lots of errors for people who don't realize what -Wall does. */
583 if (warn_uninitialized == 1)
584 warning (OPT_Wuninitialized,
585 "-Wuninitialized is not supported without -O");
588 if (flag_really_no_inline == 2)
589 flag_really_no_inline = flag_no_inline;
591 /* The optimization to partition hot and cold basic blocks into separate
592 sections of the .o and executable files does not work (currently)
593 with exception handling. This is because there is no support for
594 generating unwind info. If flag_exceptions is turned on we need to
595 turn off the partitioning optimization. */
597 if (flag_exceptions && flag_reorder_blocks_and_partition)
600 ("-freorder-blocks-and-partition does not work with exceptions");
601 flag_reorder_blocks_and_partition = 0;
602 flag_reorder_blocks = 1;
605 /* If user requested unwind info, then turn off the partitioning
608 if (flag_unwind_tables && ! targetm.unwind_tables_default
609 && flag_reorder_blocks_and_partition)
611 inform ("-freorder-blocks-and-partition does not support unwind info");
612 flag_reorder_blocks_and_partition = 0;
613 flag_reorder_blocks = 1;
616 /* If the target requested unwind info, then turn off the partitioning
617 optimization with a different message. Likewise, if the target does not
618 support named sections. */
620 if (flag_reorder_blocks_and_partition
621 && (!targetm.have_named_sections
622 || (flag_unwind_tables && targetm.unwind_tables_default)))
625 ("-freorder-blocks-and-partition does not work on this architecture");
626 flag_reorder_blocks_and_partition = 0;
627 flag_reorder_blocks = 1;
631 #define LEFT_COLUMN 27
633 /* Output ITEM, of length ITEM_WIDTH, in the left column,
634 followed by word-wrapped HELP in a second column. */
636 wrap_help (const char *help,
638 unsigned int item_width,
639 unsigned int columns)
641 unsigned int col_width = LEFT_COLUMN;
642 unsigned int remaining, room, len;
644 remaining = strlen (help);
648 room = columns - 3 - MAX (col_width, item_width);
657 for (i = 0; help[i]; i++)
659 if (i >= room && len != remaining)
663 else if ((help[i] == '-' || help[i] == '/')
664 && help[i + 1] != ' '
665 && i > 0 && ISALPHA (help[i - 1]))
670 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
672 while (help[len] == ' ')
680 /* Print help for a specific front-end, etc. */
682 print_filtered_help (unsigned int include_flags,
683 unsigned int exclude_flags,
684 unsigned int any_flags,
685 unsigned int columns)
689 static char *printed = NULL;
691 bool displayed = false;
693 if (include_flags == CL_PARAMS)
695 for (i = 0; i < LAST_PARAM; i++)
697 const char *param = compiler_params[i].option;
699 help = compiler_params[i].help;
700 if (help == NULL || *help == '\0')
702 if (exclude_flags & CL_UNDOCUMENTED)
704 help = undocumented_msg;
707 /* Get the translation. */
710 wrap_help (help, param, strlen (param), columns);
717 printed = xcalloc (1, cl_options_count);
719 for (i = 0; i < cl_options_count; i++)
721 static char new_help[128];
722 const struct cl_option *option = cl_options + i;
727 if (include_flags == 0
728 || ((option->flags & include_flags) != include_flags))
730 if ((option->flags & any_flags) == 0)
734 /* Skip unwanted switches. */
735 if ((option->flags & exclude_flags) != 0)
739 /* Skip switches that have already been printed. */
748 if (exclude_flags & CL_UNDOCUMENTED)
750 help = undocumented_msg;
753 /* Get the translation. */
756 /* Find the gap between the name of the
757 option and its descriptive text. */
758 tab = strchr (help, '\t');
767 opt = option->opt_text;
771 /* With the -Q option enabled we change the descriptive text associated
772 with an option to be an indication of its current setting. */
775 if (len < (LEFT_COLUMN + 2))
776 strcpy (new_help, "\t\t");
778 strcpy (new_help, "\t");
780 if (option->flag_var != NULL)
782 if (option->flags & CL_JOINED)
784 if (option->var_type == CLVC_STRING)
786 if (* (const char **) option->flag_var != NULL)
787 snprintf (new_help + strlen (new_help),
788 sizeof (new_help) - strlen (new_help),
789 * (const char **) option->flag_var);
792 sprintf (new_help + strlen (new_help),
793 "%#x", * (int *) option->flag_var);
796 strcat (new_help, option_enabled (i)
797 ? _("[enabled]") : _("[disabled]"));
803 wrap_help (help, opt, len, columns);
808 printf (_(" No options with the desired characteristics were found\n"));
809 else if (! displayed)
810 printf (_(" All options with the desired characteristics have already been displayed\n"));
815 /* Display help for a specified type of option.
816 The options must have ALL of the INCLUDE_FLAGS set
817 ANY of the flags in the ANY_FLAGS set
818 and NONE of the EXCLUDE_FLAGS set. */
820 print_specific_help (unsigned int include_flags,
821 unsigned int exclude_flags,
822 unsigned int any_flags)
824 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
825 const char * description = NULL;
826 const char * descrip_extra = "";
829 static unsigned int columns = 0;
831 /* Sanity check: Make sure that we do not have more
832 languages than we have bits available to enumerate them. */
833 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
835 /* If we have not done so already, obtain
836 the desired maximum width of the output. */
841 GET_ENVIRONMENT (p, "COLUMNS");
844 int value = atoi (p);
851 /* Use a reasonable default. */
855 /* Decide upon the title for the options that we are going to display. */
856 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
858 switch (flag & include_flags)
864 description = _("The following options are target specific");
867 description = _("The following options control compiler warning messages");
869 case CL_OPTIMIZATION:
870 description = _("The following options control optimizations");
873 description = _("The following options are language-independent");
876 description = _("The --param option recognizes the following as parameters");
879 if (i >= cl_lang_count)
881 if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
883 description = _("The following options are specific to the language ");
884 descrip_extra = lang_names [i];
887 description = _("The following options are supported by, amoung others, the language ");
892 if (description == NULL)
896 if (include_flags == CL_UNDOCUMENTED)
897 description = _("The following options are not documented");
900 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
907 if (any_flags & all_langs_mask)
908 description = _("The following options are language-related");
910 description = _("The following options are language-independent");
914 printf ("%s%s:\n", description, descrip_extra);
915 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
918 /* Handle target- and language-independent options. Return zero to
919 generate an "unknown option" message. Only options that need
920 extra handling need to be listed here; if you simply want
921 VALUE assigned to a variable, it happens automatically. */
924 common_handle_option (size_t scode, const char *arg, int value,
925 unsigned int lang_mask)
927 enum opt_code code = (enum opt_code) scode;
938 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
939 unsigned int undoc_mask;
942 undoc_mask = extra_warnings ? 0 : CL_UNDOCUMENTED;
943 /* First display any single language specific options. */
944 for (i = 0; i < cl_lang_count; i++)
946 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
947 /* Next display any multi language specific options. */
948 print_specific_help (0, undoc_mask, all_langs_mask);
949 /* Then display any remaining, non-language options. */
950 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
951 print_specific_help (i, undoc_mask, 0);
952 exit_after_options = true;
956 case OPT_ftarget_help:
957 case OPT__target_help:
958 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
959 exit_after_options = true;
965 const char * a = arg;
966 unsigned int include_flags = 0;
967 /* Note - by default we include undocumented options when listing
968 specific classes. If you only want to see documented options
969 then add ",^undocumented" to the --help= option. e.g.:
971 --help=target,^undocumented */
972 unsigned int exclude_flags = 0;
974 /* Walk along the argument string, parsing each word in turn.
976 arg = [^]{word}[,{arg}]
977 word = {optimizers|target|warnings|undocumented|params} */
987 { "optimizers", CL_OPTIMIZATION },
988 { "target", CL_TARGET },
989 { "warnings", CL_WARNING },
990 { "undocumented", CL_UNDOCUMENTED },
991 { "params", CL_PARAMS },
992 { "joined", CL_JOINED },
993 { "separate", CL_SEPARATE },
996 unsigned int * pflags;
1004 pflags = & exclude_flags;
1007 pflags = & include_flags;
1009 comma = strchr (a, ',');
1015 for (i = 0; specifics[i].string != NULL; i++)
1016 if (strncasecmp (a, specifics[i].string, len) == 0)
1018 * pflags |= specifics[i].flag;
1022 if (specifics[i].string == NULL)
1024 /* Check to see if the string matches a language name. */
1025 for (i = 0; i < cl_lang_count; i++)
1026 if (strncasecmp (a, lang_names[i], len) == 0)
1028 * pflags |= 1U << i;
1032 if (i == cl_lang_count)
1034 "warning: unrecognized argument to --help= switch: %.*s\n",
1044 print_specific_help (include_flags, exclude_flags, 0);
1045 exit_after_options = true;
1050 print_version (stderr, "");
1051 exit_after_options = true;
1055 g_switch_value = value;
1056 g_switch_set = true;
1061 /* Currently handled in a prescan. */
1065 /* For backward compatibility, -W is the same as -Wextra. */
1074 new_option = XNEWVEC (char, strlen (arg) + 2);
1075 new_option[0] = 'W';
1076 strcpy (new_option+1, arg);
1077 option_index = find_opt (new_option, lang_mask);
1078 if (option_index == N_OPTS)
1080 error ("-Werror-%s: No option -%s", arg, new_option);
1084 int kind = value ? DK_ERROR : DK_WARNING;
1085 diagnostic_classify_diagnostic (global_dc, option_index, kind);
1087 /* -Werror=foo implies -Wfoo. */
1088 if (cl_options[option_index].var_type == CLVC_BOOLEAN
1089 && cl_options[option_index].flag_var
1090 && kind == DK_ERROR)
1091 *(int *) cl_options[option_index].flag_var = 1;
1101 case OPT_Wlarger_than_:
1102 larger_than_size = value;
1103 warn_larger_than = value != -1;
1106 case OPT_Wstrict_aliasing:
1107 case OPT_Wstrict_aliasing_:
1108 warn_strict_aliasing = value;
1111 case OPT_Wstrict_overflow:
1112 case OPT_Wstrict_overflow_:
1113 warn_strict_overflow = value;
1117 set_Wunused (value);
1122 aux_info_file_name = arg;
1123 flag_gen_aux_info = 1;
1127 aux_base_name = arg;
1130 case OPT_auxbase_strip:
1132 char *tmp = xstrdup (arg);
1133 strip_off_ending (tmp, strlen (tmp));
1135 aux_base_name = tmp;
1140 decode_d_option (arg);
1144 dump_base_name = arg;
1147 case OPT_falign_functions_:
1148 align_functions = value;
1151 case OPT_falign_jumps_:
1152 align_jumps = value;
1155 case OPT_falign_labels_:
1156 align_labels = value;
1159 case OPT_falign_loops_:
1160 align_loops = value;
1163 case OPT_fbranch_probabilities:
1164 flag_branch_probabilities_set = true;
1167 case OPT_fcall_used_:
1168 fix_register (arg, 0, 1);
1171 case OPT_fcall_saved_:
1172 fix_register (arg, 0, 0);
1175 case OPT_fdiagnostics_show_location_:
1176 if (!strcmp (arg, "once"))
1177 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1178 else if (!strcmp (arg, "every-line"))
1179 diagnostic_prefixing_rule (global_dc)
1180 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1185 case OPT_fdiagnostics_show_option:
1186 global_dc->show_option_requested = true;
1190 if (!dump_switch_p (arg))
1194 case OPT_ffast_math:
1195 set_fast_math_flags (value);
1199 fix_register (arg, 1, 1);
1202 case OPT_finline_limit_:
1203 case OPT_finline_limit_eq:
1204 set_param_value ("max-inline-insns-single", value / 2);
1205 set_param_value ("max-inline-insns-auto", value / 2);
1208 case OPT_fmessage_length_:
1209 pp_set_line_maximum_length (global_dc->printer, value);
1212 case OPT_fpack_struct_:
1213 if (value <= 0 || (value & (value - 1)) || value > 16)
1214 error ("structure alignment must be a small power of two, not %d", value);
1217 initial_max_fld_align = value;
1218 maximum_field_alignment = value * BITS_PER_UNIT;
1222 case OPT_fpeel_loops:
1223 flag_peel_loops_set = true;
1226 case OPT_fprofile_arcs:
1227 profile_arc_flag_set = true;
1230 case OPT_fprofile_use:
1231 if (!flag_branch_probabilities_set)
1232 flag_branch_probabilities = value;
1233 if (!flag_profile_values_set)
1234 flag_profile_values = value;
1235 if (!flag_unroll_loops_set)
1236 flag_unroll_loops = value;
1237 if (!flag_peel_loops_set)
1238 flag_peel_loops = value;
1239 if (!flag_tracer_set)
1240 flag_tracer = value;
1241 if (!flag_value_profile_transformations_set)
1242 flag_value_profile_transformations = value;
1245 case OPT_fprofile_generate:
1246 if (!profile_arc_flag_set)
1247 profile_arc_flag = value;
1248 if (!flag_profile_values_set)
1249 flag_profile_values = value;
1250 if (!flag_value_profile_transformations_set)
1251 flag_value_profile_transformations = value;
1254 case OPT_fprofile_values:
1255 flag_profile_values_set = true;
1258 case OPT_fvisibility_:
1260 if (!strcmp(arg, "default"))
1261 default_visibility = VISIBILITY_DEFAULT;
1262 else if (!strcmp(arg, "internal"))
1263 default_visibility = VISIBILITY_INTERNAL;
1264 else if (!strcmp(arg, "hidden"))
1265 default_visibility = VISIBILITY_HIDDEN;
1266 else if (!strcmp(arg, "protected"))
1267 default_visibility = VISIBILITY_PROTECTED;
1269 error ("unrecognized visibility value \"%s\"", arg);
1274 flag_value_profile_transformations_set = true;
1277 case OPT_frandom_seed:
1278 /* The real switch is -fno-random-seed. */
1281 flag_random_seed = NULL;
1284 case OPT_frandom_seed_:
1285 flag_random_seed = arg;
1288 case OPT_fsched_verbose_:
1289 #ifdef INSN_SCHEDULING
1290 fix_sched_param ("verbose", arg);
1296 case OPT_fsched_stalled_insns_:
1297 flag_sched_stalled_insns = value;
1298 if (flag_sched_stalled_insns == 0)
1299 flag_sched_stalled_insns = -1;
1302 case OPT_fsched_stalled_insns_dep_:
1303 flag_sched_stalled_insns_dep = value;
1306 case OPT_fstack_limit:
1307 /* The real switch is -fno-stack-limit. */
1310 stack_limit_rtx = NULL_RTX;
1313 case OPT_fstack_limit_register_:
1315 int reg = decode_reg_name (arg);
1317 error ("unrecognized register name \"%s\"", arg);
1319 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1323 case OPT_fstack_limit_symbol_:
1324 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1327 case OPT_ftree_vectorizer_verbose_:
1328 vect_set_verbosity_level (arg);
1331 case OPT_ftls_model_:
1332 if (!strcmp (arg, "global-dynamic"))
1333 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1334 else if (!strcmp (arg, "local-dynamic"))
1335 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1336 else if (!strcmp (arg, "initial-exec"))
1337 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1338 else if (!strcmp (arg, "local-exec"))
1339 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1341 warning (0, "unknown tls-model \"%s\"", arg);
1345 flag_tracer_set = true;
1348 case OPT_funroll_loops:
1349 flag_unroll_loops_set = true;
1353 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1357 set_debug_level (SDB_DEBUG, false, arg);
1361 set_debug_level (DWARF2_DEBUG, false, arg);
1365 set_debug_level (NO_DEBUG, 2, arg);
1370 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1374 set_debug_level (VMS_DEBUG, false, arg);
1379 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1383 asm_file_name = arg;
1386 case OPT_pedantic_errors:
1387 flag_pedantic_errors = pedantic = 1;
1390 case OPT_floop_optimize:
1391 case OPT_frerun_loop_opt:
1392 case OPT_fstrength_reduce:
1393 /* These are no-ops, preserved for backward compatibility. */
1397 /* If the flag was handled in a standard way, assume the lack of
1398 processing here is intentional. */
1399 gcc_assert (cl_options[scode].flag_var);
1406 /* Handle --param NAME=VALUE. */
1408 handle_param (const char *carg)
1413 arg = xstrdup (carg);
1414 equal = strchr (arg, '=');
1416 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1419 value = integral_argument (equal + 1);
1421 error ("invalid --param value %qs", equal + 1);
1425 set_param_value (arg, value);
1432 /* Handle -W and -Wextra. */
1434 set_Wextra (int setting)
1436 extra_warnings = setting;
1437 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1439 /* We save the value of warn_uninitialized, since if they put
1440 -Wuninitialized on the command line, we need to generate a
1441 warning about not using it without also specifying -O. */
1443 warn_uninitialized = 0;
1444 else if (warn_uninitialized != 1)
1445 warn_uninitialized = 2;
1448 /* Initialize unused warning flags. */
1450 set_Wunused (int setting)
1452 warn_unused_function = setting;
1453 warn_unused_label = setting;
1454 /* Unused function parameter warnings are reported when either
1455 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1456 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1457 otherwise set maybe_warn_extra_parameter, which will be picked up
1459 maybe_warn_unused_parameter = setting;
1460 warn_unused_parameter = (setting && extra_warnings);
1461 warn_unused_variable = setting;
1462 warn_unused_value = setting;
1465 /* The following routines are useful in setting all the flags that
1466 -ffast-math and -fno-fast-math imply. */
1468 set_fast_math_flags (int set)
1470 flag_trapping_math = !set;
1471 flag_unsafe_math_optimizations = set;
1472 flag_finite_math_only = set;
1473 flag_signed_zeros = !set;
1474 flag_errno_math = !set;
1477 flag_signaling_nans = 0;
1478 flag_rounding_math = 0;
1479 flag_cx_limited_range = 1;
1483 /* Return true iff flags are set as if -ffast-math. */
1485 fast_math_flags_set_p (void)
1487 return (!flag_trapping_math
1488 && flag_unsafe_math_optimizations
1489 && flag_finite_math_only
1490 && !flag_signed_zeros
1491 && !flag_errno_math);
1494 /* Handle a debug output -g switch. EXTENDED is true or false to support
1495 extended output (2 is special and means "-ggdb" was given). */
1497 set_debug_level (enum debug_info_type type, int extended, const char *arg)
1499 static bool type_explicit;
1501 use_gnu_debug_info_extensions = extended;
1503 if (type == NO_DEBUG)
1505 if (write_symbols == NO_DEBUG)
1507 write_symbols = PREFERRED_DEBUGGING_TYPE;
1511 #ifdef DWARF2_DEBUGGING_INFO
1512 write_symbols = DWARF2_DEBUG;
1513 #elif defined DBX_DEBUGGING_INFO
1514 write_symbols = DBX_DEBUG;
1518 if (write_symbols == NO_DEBUG)
1519 warning (0, "target system does not support debug output");
1524 /* Does it conflict with an already selected type? */
1525 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
1526 error ("debug format \"%s\" conflicts with prior selection",
1527 debug_type_names[type]);
1528 write_symbols = type;
1529 type_explicit = true;
1532 /* A debug flag without a level defaults to level 2. */
1535 if (!debug_info_level)
1536 debug_info_level = 2;
1540 debug_info_level = integral_argument (arg);
1541 if (debug_info_level == (unsigned int) -1)
1542 error ("unrecognised debug output level \"%s\"", arg);
1543 else if (debug_info_level > 3)
1544 error ("debug output level %s is too high", arg);
1548 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1549 a simple on-off switch. */
1552 option_enabled (int opt_idx)
1554 const struct cl_option *option = &(cl_options[opt_idx]);
1556 if (option->flag_var)
1557 switch (option->var_type)
1560 return *(int *) option->flag_var != 0;
1563 return *(int *) option->flag_var == option->var_value;
1565 case CLVC_BIT_CLEAR:
1566 return (*(int *) option->flag_var & option->var_value) == 0;
1569 return (*(int *) option->flag_var & option->var_value) != 0;
1577 /* Fill STATE with the current state of option OPTION. Return true if
1578 there is some state to store. */
1581 get_option_state (int option, struct cl_option_state *state)
1583 if (cl_options[option].flag_var == 0)
1586 switch (cl_options[option].var_type)
1590 state->data = cl_options[option].flag_var;
1591 state->size = sizeof (int);
1594 case CLVC_BIT_CLEAR:
1596 state->ch = option_enabled (option);
1597 state->data = &state->ch;
1602 state->data = *(const char **) cl_options[option].flag_var;
1603 if (state->data == 0)
1605 state->size = strlen (state->data) + 1;