1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
31 #include "langhooks.h"
37 #include "diagnostic.h"
38 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
39 #include "insn-attr.h" /* For INSN_SCHEDULING. */
41 #include "tree-pass.h"
45 /* Value of the -G xx switch, and whether it was passed or not. */
46 unsigned HOST_WIDE_INT g_switch_value;
49 /* True if we should exit after parsing options. */
50 bool exit_after_options;
52 /* Print various extra warnings. -W/-Wextra. */
55 /* True to warn about any objects definitions whose size is larger
56 than N bytes. Also want about function definitions whose returned
57 values are larger than N bytes, where N is `larger_than_size'. */
58 bool warn_larger_than;
59 HOST_WIDE_INT larger_than_size;
61 /* True to warn about any function whose frame size is larger
63 bool warn_frame_larger_than;
64 HOST_WIDE_INT frame_larger_than_size;
66 /* Type(s) of debugging information we are producing (if any). See
67 flags.h for the definitions of the different possible types of
68 debugging information. */
69 enum debug_info_type write_symbols = NO_DEBUG;
71 /* Level of debugging information we are producing. See flags.h for
72 the definitions of the different possible levels. */
73 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
75 /* A major contribution to object and executable size is debug
76 information size. A major contribution to debug information size
77 is struct descriptions replicated in several object files. The
78 following flags attempt to reduce this information. The basic
79 idea is to not emit struct debugging information in the current
80 compilation unit when that information will be generated by
81 another compilation unit.
83 Debug information for a struct defined in the current source
84 file should be generated in the object file. Likewise the
85 debug information for a struct defined in a header should be
86 generated in the object file of the corresponding source file.
87 Both of these case are handled when the base name of the file of
88 the struct definition matches the base name of the source file
89 of the current compilation unit. This matching emits minimal
90 struct debugging information.
92 The base file name matching rule above will fail to emit debug
93 information for structs defined in system headers. So a second
94 category of files includes system headers in addition to files
97 The remaining types of files are library headers and application
98 headers. We cannot currently distinguish these two types. */
100 enum debug_struct_file
102 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
103 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
104 same base name as the compilation unit. */
105 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
107 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
110 /* Generic structs (e.g. templates not explicitly specialized)
111 may not have a compilation unit associated with them, and so
112 may need to be treated differently from ordinary structs.
114 Structs only handled by reference (indirectly), will also usually
115 not need as much debugging information. */
117 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
118 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
119 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
120 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
122 /* Parse the -femit-struct-debug-detailed option value
123 and set the flag variables. */
125 #define MATCH( prefix, string ) \
126 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
127 ? ((string += sizeof prefix - 1), 1) : 0)
130 set_struct_debug_option (const char *spec)
132 /* various labels for comparison */
133 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
134 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
135 static char none_lbl[] = "none", any_lbl[] = "any";
136 static char base_lbl[] = "base", sys_lbl[] = "sys";
138 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
139 /* Default is to apply to as much as possible. */
140 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
141 int ord = 1, gen = 1;
144 if (MATCH (dfn_lbl, spec))
145 usage = DINFO_USAGE_DFN;
146 else if (MATCH (dir_lbl, spec))
147 usage = DINFO_USAGE_DIR_USE;
148 else if (MATCH (ind_lbl, spec))
149 usage = DINFO_USAGE_IND_USE;
151 /* Generics or not? */
152 if (MATCH (ord_lbl, spec))
154 else if (MATCH (gen_lbl, spec))
157 /* What allowable environment? */
158 if (MATCH (none_lbl, spec))
159 files = DINFO_STRUCT_FILE_NONE;
160 else if (MATCH (any_lbl, spec))
161 files = DINFO_STRUCT_FILE_ANY;
162 else if (MATCH (sys_lbl, spec))
163 files = DINFO_STRUCT_FILE_SYS;
164 else if (MATCH (base_lbl, spec))
165 files = DINFO_STRUCT_FILE_BASE;
167 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
170 /* Effect the specification. */
171 if (usage == DINFO_USAGE_NUM_ENUMS)
175 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
176 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
177 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
181 debug_struct_generic[DINFO_USAGE_DFN] = files;
182 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
183 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
189 debug_struct_ordinary[usage] = files;
191 debug_struct_generic[usage] = files;
195 set_struct_debug_option (spec+1);
198 /* No more -femit-struct-debug-detailed specifications.
201 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
203 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
204 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
205 || debug_struct_generic[DINFO_USAGE_DIR_USE]
206 < debug_struct_generic[DINFO_USAGE_IND_USE])
207 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
208 " as much as %<-femit-struct-debug-detailed=ind:...%>");
212 /* Find the base name of a path, stripping off both directories and
213 a single final extension. */
215 base_of_path (const char *path, const char **base_out)
217 const char *base = path;
219 const char *p = path;
223 if (IS_DIR_SEPARATOR(c))
238 /* Match the base name of a file to the base name of a compilation unit. */
240 static const char *main_input_basename;
241 static int main_input_baselength;
244 matches_main_base (const char *path)
246 /* Cache the last query. */
247 static const char *last_path = NULL;
248 static int last_match = 0;
249 if (path != last_path)
252 int length = base_of_path (path, &base);
254 last_match = (length == main_input_baselength
255 && memcmp (base, main_input_basename, length) == 0);
260 #ifdef DEBUG_DEBUG_STRUCT
263 dump_struct_debug (tree type, enum debug_info_usage usage,
264 enum debug_struct_file criterion, int generic,
265 int matches, int result)
267 /* Find the type name. */
268 tree type_decl = TYPE_STUB_DECL (type);
270 const char *name = 0;
271 if (TREE_CODE (t) == TYPE_DECL)
274 name = IDENTIFIER_POINTER (t);
276 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
278 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
279 matches ? "bas" : "hdr",
280 generic ? "gen" : "ord",
281 usage == DINFO_USAGE_DFN ? ";" :
282 usage == DINFO_USAGE_DIR_USE ? "." : "*",
284 (void*) type_decl, name);
287 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
288 dump_struct_debug (type, usage, criterion, generic, matches, result)
292 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
299 should_emit_struct_debug (tree type, enum debug_info_usage usage)
301 enum debug_struct_file criterion;
303 bool generic = lang_hooks.types.generic_p (type);
306 criterion = debug_struct_generic[usage];
308 criterion = debug_struct_ordinary[usage];
310 if (criterion == DINFO_STRUCT_FILE_NONE)
311 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
312 if (criterion == DINFO_STRUCT_FILE_ANY)
313 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
315 type_decl = TYPE_STUB_DECL (type);
317 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
318 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
320 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
321 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
322 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
325 /* Nonzero means use GNU-only extensions in the generated symbolic
326 debugging information. Currently, this only has an effect when
327 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
328 bool use_gnu_debug_info_extensions;
330 /* The default visibility for all symbols (unless overridden) */
331 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
333 /* Global visibility options. */
334 struct visibility_flags visibility_options;
336 /* What to print when a switch has no documentation. */
337 #ifdef ENABLE_CHECKING
338 static const char undocumented_msg[] = N_("This switch lacks documentation");
340 static const char undocumented_msg[] = "";
343 /* Used for bookkeeping on whether user set these flags so
344 -fprofile-use/-fprofile-generate does not use them. */
345 static bool profile_arc_flag_set, flag_profile_values_set;
346 static bool flag_unroll_loops_set, flag_tracer_set;
347 static bool flag_value_profile_transformations_set;
348 static bool flag_peel_loops_set, flag_branch_probabilities_set;
349 static bool flag_inline_functions_set;
351 /* Functions excluded from profiling. */
353 typedef char *char_p; /* For DEF_VEC_P. */
355 DEF_VEC_ALLOC_P(char_p,heap);
357 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
358 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
360 typedef const char *const_char_p; /* For DEF_VEC_P. */
361 DEF_VEC_P(const_char_p);
362 DEF_VEC_ALLOC_P(const_char_p,heap);
364 static VEC(const_char_p,heap) *ignored_options;
366 /* Function calls disallowed under -Wdisallowed-function-list=... */
367 static VEC(char_p,heap) *warning_disallowed_functions;
369 /* If -Wdisallowed-function-list=... */
370 bool warn_disallowed_functions = false;
372 /* Input file names. */
373 const char **in_fnames;
374 unsigned num_in_fnames;
376 static int common_handle_option (size_t scode, const char *arg, int value,
377 unsigned int lang_mask);
378 static void handle_param (const char *);
379 static void set_Wextra (int);
380 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
381 static char *write_langs (unsigned int lang_mask);
382 static void complain_wrong_lang (const char *, const struct cl_option *,
383 unsigned int lang_mask);
384 static void handle_options (unsigned int, const char **, unsigned int);
385 static void set_debug_level (enum debug_info_type type, int extended,
388 /* If ARG is a non-negative integer made up solely of digits, return its
389 value, otherwise return -1. */
391 integral_argument (const char *arg)
395 while (*p && ISDIGIT (*p))
404 /* Return a malloced slash-separated list of languages in MASK. */
406 write_langs (unsigned int mask)
408 unsigned int n = 0, len = 0;
409 const char *lang_name;
412 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
413 if (mask & (1U << n))
414 len += strlen (lang_name) + 1;
416 result = XNEWVEC (char, len);
418 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
419 if (mask & (1U << n))
423 strcpy (result + len, lang_name);
424 len += strlen (lang_name);
432 /* Complain that switch OPT_INDEX does not apply to this front end. */
434 complain_wrong_lang (const char *text, const struct cl_option *option,
435 unsigned int lang_mask)
437 char *ok_langs, *bad_lang;
439 ok_langs = write_langs (option->flags);
440 bad_lang = write_langs (lang_mask);
442 /* Eventually this should become a hard error IMO. */
443 warning (0, "command line option \"%s\" is valid for %s but not for %s",
444 text, ok_langs, bad_lang);
450 /* Buffer the unknown option described by the string OPT. Currently,
451 we only complain about unknown -Wno-* options if they may have
452 prevented a diagnostic. Otherwise, we just ignore them.
453 Note that if we do complain, it is only as a warning, not an error;
454 passing the compiler an unrecognised -Wno-* option should never
455 change whether the compilation succeeds or fails. */
457 static void postpone_unknown_option_warning(const char *opt)
459 VEC_safe_push (const_char_p, heap, ignored_options, opt);
462 /* Produce a warning for each option previously buffered. */
464 void print_ignored_options (void)
466 location_t saved_loc = input_location;
470 while (!VEC_empty (const_char_p, ignored_options))
473 opt = VEC_pop (const_char_p, ignored_options);
474 warning (0, "unrecognized command line option \"%s\"", opt);
477 input_location = saved_loc;
480 /* Handle the switch beginning at ARGV for the language indicated by
481 LANG_MASK. Returns the number of switches consumed. */
483 handle_option (const char **argv, unsigned int lang_mask)
486 const char *opt, *arg = 0;
489 unsigned int result = 0;
490 const struct cl_option *option;
494 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
495 if (opt_index == cl_options_count
496 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
497 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
499 /* Drop the "no-" from negative switches. */
500 size_t len = strlen (opt) - 3;
502 dup = XNEWVEC (char, len + 1);
505 memcpy (dup + 2, opt + 5, len - 2 + 1);
508 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
509 if (opt_index == cl_options_count && opt[1] == 'W')
511 /* We don't generate warnings for unknown -Wno-* options
512 unless we issue diagnostics. */
513 postpone_unknown_option_warning (argv[0]);
519 if (opt_index == cl_options_count)
522 option = &cl_options[opt_index];
524 /* Reject negative form of switches that don't take negatives as
526 if (!value && (option->flags & CL_REJECT_NEGATIVE))
529 /* We've recognized this switch. */
532 /* Check to see if the option is disabled for this configuration. */
533 if (option->flags & CL_DISABLED)
535 error ("command line option %qs"
536 " is not supported by this configuration", opt);
540 /* Sort out any argument the switch takes. */
541 if (option->flags & CL_JOINED)
543 /* Have arg point to the original switch. This is because
544 some code, such as disable_builtin_function, expects its
545 argument to be persistent until the program exits. */
546 arg = argv[0] + cl_options[opt_index].opt_len + 1;
548 arg += strlen ("no-");
550 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
552 if (option->flags & CL_SEPARATE)
558 /* Missing argument. */
562 else if (option->flags & CL_SEPARATE)
568 /* Now we've swallowed any potential argument, complain if this
569 is a switch for a different front end. */
570 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
572 complain_wrong_lang (argv[0], option, lang_mask);
575 else if ((option->flags & CL_TARGET)
576 && (option->flags & CL_LANG_ALL)
577 && !(option->flags & lang_mask))
579 /* Complain for target flag language mismatches if any languages
581 complain_wrong_lang (argv[0], option, lang_mask);
585 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
587 if (!lang_hooks.missing_argument (opt, opt_index))
588 error ("missing argument to \"%s\"", opt);
592 /* If the switch takes an integer, convert it. */
593 if (arg && (option->flags & CL_UINTEGER))
595 value = integral_argument (arg);
598 error ("argument to \"%s\" should be a non-negative integer",
604 if (option->flag_var)
605 switch (option->var_type)
608 *(int *) option->flag_var = value;
612 *(int *) option->flag_var = (value
614 : !option->var_value);
619 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
620 *(int *) option->flag_var |= option->var_value;
622 *(int *) option->flag_var &= ~option->var_value;
623 if (option->flag_var == &target_flags)
624 target_flags_explicit |= option->var_value;
628 *(const char **) option->flag_var = arg;
632 if (option->flags & lang_mask)
633 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
636 if (result && (option->flags & CL_COMMON))
637 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
640 if (result && (option->flags & CL_TARGET))
641 if (!targetm.handle_option (opt_index, arg, value))
650 /* Handle FILENAME from the command line. */
652 add_input_filename (const char *filename)
655 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
656 in_fnames[num_in_fnames - 1] = filename;
659 /* Add comma-separated strings to a char_p vector. */
662 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
669 /* We never free this string. */
682 VEC_safe_push (char_p, heap, *pvec, token_start);
685 if (*r == '\\' && r[1] == ',')
693 if (*token_start != '\0')
694 VEC_safe_push (char_p, heap, *pvec, token_start);
697 /* Return whether we should exclude FNDECL from instrumentation. */
700 flag_instrument_functions_exclude_p (tree fndecl)
702 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
708 name = lang_hooks.decl_printable_name (fndecl, 0);
710 VEC_iterate (char_p, flag_instrument_functions_exclude_functions,
714 if (strstr (name, s) != NULL)
719 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
725 name = DECL_SOURCE_FILE (fndecl);
727 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s);
730 if (strstr (name, s) != NULL)
739 /* Return whether this function call is disallowed. */
741 warn_if_disallowed_function_p (const_tree exp)
743 if (TREE_CODE(exp) == CALL_EXPR
744 && VEC_length (char_p, warning_disallowed_functions) > 0)
749 IDENTIFIER_POINTER (DECL_NAME (get_callee_fndecl (exp)));
750 for (i = 0; VEC_iterate (char_p, warning_disallowed_functions, i, s);
753 if (strcmp (fnname, s) == 0)
755 warning (OPT_Wdisallowed_function_list_,
756 "disallowed call to %qs", fnname);
763 /* Decode and handle the vector of command line options. LANG_MASK
764 contains has a single bit set representing the current
767 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
771 for (i = 1; i < argc; i += n)
773 const char *opt = argv[i];
775 /* Interpret "-" or a non-switch as a file name. */
776 if (opt[0] != '-' || opt[1] == '\0')
778 if (main_input_filename == NULL)
780 main_input_filename = opt;
781 main_input_baselength
782 = base_of_path (main_input_filename, &main_input_basename);
784 add_input_filename (opt);
789 n = handle_option (argv + i, lang_mask);
794 error ("unrecognized command line option \"%s\"", opt);
799 /* Parse command line options and set default flag values. Do minimal
800 options processing. */
802 decode_options (unsigned int argc, const char **argv)
804 static bool first_time_p = true;
805 static int initial_max_aliased_vops;
806 static int initial_avg_aliased_vops;
807 static int initial_min_crossjump_insns;
808 static int initial_max_fields_for_field_sensitive;
809 static unsigned int initial_lang_mask;
811 unsigned int i, lang_mask;
819 /* Perform language-specific options initialization. */
820 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv);
822 lang_hooks.initialize_diagnostics (global_dc);
824 /* Save initial values of parameters we reset. */
825 initial_max_aliased_vops = MAX_ALIASED_VOPS;
826 initial_avg_aliased_vops = AVG_ALIASED_VOPS;
827 initial_min_crossjump_insns
828 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
829 initial_max_fields_for_field_sensitive
830 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
833 lang_mask = initial_lang_mask;
835 /* Scan to see what optimization level has been specified. That will
836 determine the default value of many flags. */
837 for (i = 1; i < argc; i++)
839 if (!strcmp (argv[i], "-O"))
844 else if (argv[i][0] == '-' && argv[i][1] == 'O')
846 /* Handle -Os, -O2, -O3, -O69, ... */
847 const char *p = &argv[i][2];
849 if ((p[0] == 's') && (p[1] == 0))
853 /* Optimizing for size forces optimize to be 2. */
858 const int optimize_val = read_integral_parameter (p, p - 2, -1);
859 if (optimize_val != -1)
861 optimize = optimize_val;
868 if (!flag_unit_at_a_time)
870 flag_section_anchors = 0;
871 flag_toplevel_reorder = 0;
873 if (!flag_toplevel_reorder)
875 if (flag_section_anchors == 1)
876 error ("Section anchors must be disabled when toplevel reorder is disabled.");
877 flag_section_anchors = 0;
880 /* Originally we just set the variables if a particular optimization level,
881 but with the advent of being able to change the optimization level for a
882 function, we need to reset optimizations. */
885 flag_merge_constants = 0;
887 /* We disable toplevel reordering at -O0 to disable transformations that
888 might be surprising to end users and to get -fno-toplevel-reorder
889 tested, but we keep section anchors. */
890 if (flag_toplevel_reorder == 2)
891 flag_toplevel_reorder = 0;
894 flag_merge_constants = 1;
896 /* -O1 optimizations. */
897 opt1 = (optimize >= 1);
898 flag_defer_pop = opt1;
900 flag_delayed_branch = opt1;
902 #ifdef CAN_DEBUG_WITHOUT_FP
903 flag_omit_frame_pointer = opt1;
905 flag_guess_branch_prob = opt1;
906 flag_cprop_registers = opt1;
907 flag_if_conversion = opt1;
908 flag_if_conversion2 = opt1;
909 flag_ipa_pure_const = opt1;
910 flag_ipa_reference = opt1;
911 flag_split_wide_types = opt1;
912 flag_tree_ccp = opt1;
913 flag_tree_dce = opt1;
914 flag_tree_dom = opt1;
915 flag_tree_dse = opt1;
916 flag_tree_ter = opt1;
917 flag_tree_sra = opt1;
918 flag_tree_copyrename = opt1;
919 flag_tree_fre = opt1;
920 flag_tree_copy_prop = opt1;
921 flag_tree_sink = opt1;
924 /* -O2 optimizations. */
925 opt2 = (optimize >= 2);
926 flag_inline_small_functions = opt2;
927 flag_indirect_inlining = opt2;
928 flag_thread_jumps = opt2;
929 flag_crossjumping = opt2;
930 flag_optimize_sibling_calls = opt2;
931 flag_forward_propagate = opt2;
932 flag_cse_follow_jumps = opt2;
934 flag_expensive_optimizations = opt2;
935 flag_rerun_cse_after_loop = opt2;
936 flag_caller_saves = opt2;
937 flag_peephole2 = opt2;
938 #ifdef INSN_SCHEDULING
939 flag_schedule_insns = opt2;
940 flag_schedule_insns_after_reload = opt2;
943 flag_strict_aliasing = opt2;
944 flag_strict_overflow = opt2;
945 flag_delete_null_pointer_checks = opt2;
946 flag_reorder_blocks = opt2;
947 flag_reorder_functions = opt2;
948 flag_tree_store_ccp = opt2;
949 flag_tree_vrp = opt2;
950 flag_tree_builtin_call_dce = opt2;
951 flag_tree_pre = opt2;
952 flag_tree_switch_conversion = 1;
954 /* Allow more virtual operators to increase alias precision. */
956 set_param_value ("max-aliased-vops",
957 (opt2) ? 500 : initial_max_aliased_vops);
959 /* Track fields in field-sensitive alias analysis. */
960 set_param_value ("max-fields-for-field-sensitive",
961 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
963 /* -O3 optimizations. */
964 opt3 = (optimize >= 3);
965 flag_predictive_commoning = opt3;
966 flag_inline_functions = opt3;
967 flag_unswitch_loops = opt3;
968 flag_gcse_after_reload = opt3;
969 flag_tree_vectorize = opt3;
971 /* Allow even more virtual operators. Max-aliased-vops was set above for
972 -O2, so don't reset it unless we are at -O3. */
974 set_param_value ("max-aliased-vops", 1000);
976 set_param_value ("avg-aliased-vops", (opt3) ? 3 : initial_avg_aliased_vops);
978 /* Just -O1/-O0 optimizations. */
979 opt1_max = (optimize <= 1);
980 align_loops = opt1_max;
981 align_jumps = opt1_max;
982 align_labels = opt1_max;
983 align_functions = opt1_max;
987 /* Loop header copying usually increases size of the code. This used not to
988 be true, since quite often it is possible to verify that the condition is
989 satisfied in the first iteration and therefore to eliminate it. Jump
990 threading handles these cases now. */
993 /* Conditional DCE generates bigger code. */
994 flag_tree_builtin_call_dce = 0;
996 /* PRE tends to generate bigger code. */
999 /* These options are set with -O3, so reset for -Os */
1000 flag_predictive_commoning = 0;
1001 flag_inline_functions = 0;
1002 flag_unswitch_loops = 0;
1003 flag_gcse_after_reload = 0;
1004 flag_tree_vectorize = 0;
1006 /* Don't reorder blocks when optimizing for size because extra jump insns may
1007 be created; also barrier may create extra padding.
1009 More correctly we should have a block reordering mode that tried to
1010 minimize the combined size of all the jumps. This would more or less
1011 automatically remove extra jumps, but would also try to use more short
1012 jumps instead of long jumps. */
1013 flag_reorder_blocks = 0;
1014 flag_reorder_blocks_and_partition = 0;
1016 /* Inlining of functions reducing size is a good idea regardless of them
1017 being declared inline. */
1018 flag_inline_functions = 1;
1020 /* Don't align code. */
1024 align_functions = 1;
1026 /* Unroll/prefetch switches that may be set on the command line, and tend to
1027 generate bigger code. */
1028 flag_unroll_loops = 0;
1029 flag_unroll_all_loops = 0;
1030 flag_prefetch_loop_arrays = 0;
1032 /* Basic optimization options. */
1037 /* We want to crossjump as much as possible. */
1038 set_param_value ("min-crossjump-insns", 1);
1041 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
1045 /* Initialize whether `char' is signed. */
1046 flag_signed_char = DEFAULT_SIGNED_CHAR;
1047 /* Set this to a special "uninitialized" value. The actual default is
1048 set after target options have been processed. */
1049 flag_short_enums = 2;
1051 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
1053 target_flags = targetm.default_target_flags;
1055 /* Some targets have ABI-specified unwind tables. */
1056 flag_unwind_tables = targetm.unwind_tables_default;
1059 #ifdef OPTIMIZATION_OPTIONS
1060 /* Allow default optimizations to be specified on a per-machine basis. */
1061 OPTIMIZATION_OPTIONS (optimize, optimize_size);
1064 handle_options (argc, argv, lang_mask);
1069 flag_pic = flag_pie;
1070 if (flag_pic && !flag_pie)
1076 /* Inlining does not work if not optimizing,
1077 so force it not to be done. */
1082 /* The optimization to partition hot and cold basic blocks into separate
1083 sections of the .o and executable files does not work (currently)
1084 with exception handling. This is because there is no support for
1085 generating unwind info. If flag_exceptions is turned on we need to
1086 turn off the partitioning optimization. */
1088 if (flag_exceptions && flag_reorder_blocks_and_partition)
1091 ("-freorder-blocks-and-partition does not work with exceptions");
1092 flag_reorder_blocks_and_partition = 0;
1093 flag_reorder_blocks = 1;
1096 /* If user requested unwind info, then turn off the partitioning
1099 if (flag_unwind_tables && ! targetm.unwind_tables_default
1100 && flag_reorder_blocks_and_partition)
1102 inform ("-freorder-blocks-and-partition does not support unwind info");
1103 flag_reorder_blocks_and_partition = 0;
1104 flag_reorder_blocks = 1;
1107 /* If the target requested unwind info, then turn off the partitioning
1108 optimization with a different message. Likewise, if the target does not
1109 support named sections. */
1111 if (flag_reorder_blocks_and_partition
1112 && (!targetm.have_named_sections
1113 || (flag_unwind_tables && targetm.unwind_tables_default)))
1116 ("-freorder-blocks-and-partition does not work on this architecture");
1117 flag_reorder_blocks_and_partition = 0;
1118 flag_reorder_blocks = 1;
1121 /* Save the current optimization options if this is the first call. */
1124 optimization_default_node = build_optimization_node ();
1125 optimization_current_node = optimization_default_node;
1126 first_time_p = false;
1130 #define LEFT_COLUMN 27
1132 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1133 followed by word-wrapped HELP in a second column. */
1135 wrap_help (const char *help,
1137 unsigned int item_width,
1138 unsigned int columns)
1140 unsigned int col_width = LEFT_COLUMN;
1141 unsigned int remaining, room, len;
1143 remaining = strlen (help);
1147 room = columns - 3 - MAX (col_width, item_width);
1156 for (i = 0; help[i]; i++)
1158 if (i >= room && len != remaining)
1162 else if ((help[i] == '-' || help[i] == '/')
1163 && help[i + 1] != ' '
1164 && i > 0 && ISALPHA (help[i - 1]))
1169 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1171 while (help[len] == ' ')
1179 /* Print help for a specific front-end, etc. */
1181 print_filtered_help (unsigned int include_flags,
1182 unsigned int exclude_flags,
1183 unsigned int any_flags,
1184 unsigned int columns)
1188 static char *printed = NULL;
1190 bool displayed = false;
1192 if (include_flags == CL_PARAMS)
1194 for (i = 0; i < LAST_PARAM; i++)
1196 const char *param = compiler_params[i].option;
1198 help = compiler_params[i].help;
1199 if (help == NULL || *help == '\0')
1201 if (exclude_flags & CL_UNDOCUMENTED)
1203 help = undocumented_msg;
1206 /* Get the translation. */
1209 wrap_help (help, param, strlen (param), columns);
1216 printed = XCNEWVAR (char, cl_options_count);
1218 for (i = 0; i < cl_options_count; i++)
1220 static char new_help[128];
1221 const struct cl_option *option = cl_options + i;
1226 if (include_flags == 0
1227 || ((option->flags & include_flags) != include_flags))
1229 if ((option->flags & any_flags) == 0)
1233 /* Skip unwanted switches. */
1234 if ((option->flags & exclude_flags) != 0)
1238 /* Skip switches that have already been printed. */
1244 help = option->help;
1247 if (exclude_flags & CL_UNDOCUMENTED)
1249 help = undocumented_msg;
1252 /* Get the translation. */
1255 /* Find the gap between the name of the
1256 option and its descriptive text. */
1257 tab = strchr (help, '\t');
1266 opt = option->opt_text;
1270 /* With the -Q option enabled we change the descriptive text associated
1271 with an option to be an indication of its current setting. */
1274 if (len < (LEFT_COLUMN + 2))
1275 strcpy (new_help, "\t\t");
1277 strcpy (new_help, "\t");
1279 if (option->flag_var != NULL)
1281 if (option->flags & CL_JOINED)
1283 if (option->var_type == CLVC_STRING)
1285 if (* (const char **) option->flag_var != NULL)
1286 snprintf (new_help + strlen (new_help),
1287 sizeof (new_help) - strlen (new_help),
1288 * (const char **) option->flag_var);
1291 sprintf (new_help + strlen (new_help),
1292 "%#x", * (int *) option->flag_var);
1295 strcat (new_help, option_enabled (i)
1296 ? _("[enabled]") : _("[disabled]"));
1302 wrap_help (help, opt, len, columns);
1308 unsigned int langs = include_flags & CL_LANG_ALL;
1311 printf (_(" No options with the desired characteristics were found\n"));
1316 /* PR 31349: Tell the user how to see all of the
1317 options supported by a specific front end. */
1318 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1319 if ((1U << i) & langs)
1320 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1321 lang_names[i], lang_names[i]);
1325 else if (! displayed)
1326 printf (_(" All options with the desired characteristics have already been displayed\n"));
1331 /* Display help for a specified type of option.
1332 The options must have ALL of the INCLUDE_FLAGS set
1333 ANY of the flags in the ANY_FLAGS set
1334 and NONE of the EXCLUDE_FLAGS set. */
1336 print_specific_help (unsigned int include_flags,
1337 unsigned int exclude_flags,
1338 unsigned int any_flags)
1340 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1341 const char * description = NULL;
1342 const char * descrip_extra = "";
1345 static unsigned int columns = 0;
1347 /* Sanity check: Make sure that we do not have more
1348 languages than we have bits available to enumerate them. */
1349 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1351 /* If we have not done so already, obtain
1352 the desired maximum width of the output. */
1357 GET_ENVIRONMENT (p, "COLUMNS");
1360 int value = atoi (p);
1367 /* Use a reasonable default. */
1371 /* Decide upon the title for the options that we are going to display. */
1372 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1374 switch (flag & include_flags)
1380 description = _("The following options are target specific");
1383 description = _("The following options control compiler warning messages");
1385 case CL_OPTIMIZATION:
1386 description = _("The following options control optimizations");
1389 description = _("The following options are language-independent");
1392 description = _("The --param option recognizes the following as parameters");
1395 if (i >= cl_lang_count)
1397 if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
1398 description = _("The following options are specific to just the language ");
1400 description = _("The following options are supported by the language ");
1401 descrip_extra = lang_names [i];
1406 if (description == NULL)
1410 if (include_flags == CL_UNDOCUMENTED)
1411 description = _("The following options are not documented");
1414 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1421 if (any_flags & all_langs_mask)
1422 description = _("The following options are language-related");
1424 description = _("The following options are language-independent");
1428 printf ("%s%s:\n", description, descrip_extra);
1429 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1432 /* Handle target- and language-independent options. Return zero to
1433 generate an "unknown option" message. Only options that need
1434 extra handling need to be listed here; if you simply want
1435 VALUE assigned to a variable, it happens automatically. */
1438 common_handle_option (size_t scode, const char *arg, int value,
1439 unsigned int lang_mask)
1441 static bool verbose = false;
1442 enum opt_code code = (enum opt_code) scode;
1457 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1458 unsigned int undoc_mask;
1461 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1462 /* First display any single language specific options. */
1463 for (i = 0; i < cl_lang_count; i++)
1465 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1466 /* Next display any multi language specific options. */
1467 print_specific_help (0, undoc_mask, all_langs_mask);
1468 /* Then display any remaining, non-language options. */
1469 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1470 print_specific_help (i, undoc_mask, 0);
1471 exit_after_options = true;
1475 case OPT_ftarget_help:
1476 case OPT__target_help:
1477 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1478 exit_after_options = true;
1480 /* Allow the target a chance to give the user some additional information. */
1481 if (targetm.target_help)
1482 targetm.target_help ();
1488 const char * a = arg;
1489 unsigned int include_flags = 0;
1490 /* Note - by default we include undocumented options when listing
1491 specific classes. If you only want to see documented options
1492 then add ",^undocumented" to the --help= option. E.g.:
1494 --help=target,^undocumented */
1495 unsigned int exclude_flags = 0;
1497 /* Walk along the argument string, parsing each word in turn.
1499 arg = [^]{word}[,{arg}]
1500 word = {optimizers|target|warnings|undocumented|
1501 params|common|<language>} */
1506 const char * string;
1511 { "optimizers", CL_OPTIMIZATION },
1512 { "target", CL_TARGET },
1513 { "warnings", CL_WARNING },
1514 { "undocumented", CL_UNDOCUMENTED },
1515 { "params", CL_PARAMS },
1516 { "joined", CL_JOINED },
1517 { "separate", CL_SEPARATE },
1518 { "common", CL_COMMON },
1521 unsigned int * pflags;
1523 unsigned int lang_flag, specific_flag;
1530 pflags = & exclude_flags;
1533 pflags = & include_flags;
1535 comma = strchr (a, ',');
1541 /* Check to see if the string matches an option class name. */
1542 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1543 if (strncasecmp (a, specifics[i].string, len) == 0)
1545 specific_flag = specifics[i].flag;
1549 /* Check to see if the string matches a language name.
1550 Note - we rely upon the alpha-sorted nature of the entries in
1551 the lang_names array, specifically that shorter names appear
1552 before their longer variants. (i.e. C before C++). That way
1553 when we are attempting to match --help=c for example we will
1554 match with C first and not C++. */
1555 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1556 if (strncasecmp (a, lang_names[i], len) == 0)
1558 lang_flag = 1U << i;
1562 if (specific_flag != 0)
1565 * pflags |= specific_flag;
1568 /* The option's argument matches both the start of a
1569 language name and the start of an option class name.
1570 We have a special case for when the user has
1571 specified "--help=c", but otherwise we have to issue
1573 if (strncasecmp (a, "c", len) == 0)
1574 * pflags |= lang_flag;
1577 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1581 else if (lang_flag != 0)
1582 * pflags |= lang_flag;
1585 "warning: unrecognized argument to --help= option: %.*s\n",
1594 print_specific_help (include_flags, exclude_flags, 0);
1595 exit_after_options = true;
1600 print_version (stderr, "");
1601 exit_after_options = true;
1605 g_switch_value = value;
1606 g_switch_set = true;
1611 /* Currently handled in a prescan. */
1615 /* For backward compatibility, -W is the same as -Wextra. */
1619 case OPT_Wdisallowed_function_list_:
1620 warn_disallowed_functions = true;
1621 add_comma_separated_to_vector
1622 (&warning_disallowed_functions, arg);
1626 enable_warning_as_error (arg, value, lang_mask);
1633 case OPT_Wlarger_than_:
1634 /* This form corresponds to -Wlarger-than-.
1635 Kept for backward compatibility.
1636 Don't use it as the first argument of warning(). */
1638 case OPT_Wlarger_than_eq:
1639 larger_than_size = value;
1640 warn_larger_than = value != -1;
1643 case OPT_Wframe_larger_than_:
1644 frame_larger_than_size = value;
1645 warn_frame_larger_than = value != -1;
1648 case OPT_Wstrict_aliasing:
1649 set_Wstrict_aliasing (value);
1652 case OPT_Wstrict_aliasing_:
1653 warn_strict_aliasing = value;
1656 case OPT_Wstrict_overflow:
1657 warn_strict_overflow = (value
1658 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1662 case OPT_Wstrict_overflow_:
1663 warn_strict_overflow = value;
1667 warn_unused = value;
1672 aux_info_file_name = arg;
1673 flag_gen_aux_info = 1;
1677 aux_base_name = arg;
1680 case OPT_auxbase_strip:
1682 char *tmp = xstrdup (arg);
1683 strip_off_ending (tmp, strlen (tmp));
1685 aux_base_name = tmp;
1690 decode_d_option (arg);
1694 dump_base_name = arg;
1697 case OPT_falign_functions_:
1698 align_functions = value;
1701 case OPT_falign_jumps_:
1702 align_jumps = value;
1705 case OPT_falign_labels_:
1706 align_labels = value;
1709 case OPT_falign_loops_:
1710 align_loops = value;
1713 case OPT_fbranch_probabilities:
1714 flag_branch_probabilities_set = true;
1717 case OPT_fcall_used_:
1718 fix_register (arg, 0, 1);
1721 case OPT_fcall_saved_:
1722 fix_register (arg, 0, 0);
1726 dbg_cnt_process_opt (arg);
1729 case OPT_fdbg_cnt_list:
1730 dbg_cnt_list_all_counters ();
1733 case OPT_fdebug_prefix_map_:
1734 add_debug_prefix_map (arg);
1737 case OPT_fdiagnostics_show_location_:
1738 if (!strcmp (arg, "once"))
1739 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1740 else if (!strcmp (arg, "every-line"))
1741 diagnostic_prefixing_rule (global_dc)
1742 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1747 case OPT_fdiagnostics_show_option:
1748 global_dc->show_option_requested = true;
1752 if (!dump_switch_p (arg))
1756 case OPT_ffast_math:
1757 set_fast_math_flags (value);
1760 case OPT_funsafe_math_optimizations:
1761 set_unsafe_math_optimizations_flags (value);
1765 fix_register (arg, 1, 1);
1768 case OPT_finline_limit_:
1769 case OPT_finline_limit_eq:
1770 set_param_value ("max-inline-insns-single", value / 2);
1771 set_param_value ("max-inline-insns-auto", value / 2);
1774 case OPT_finstrument_functions_exclude_function_list_:
1775 add_comma_separated_to_vector
1776 (&flag_instrument_functions_exclude_functions, arg);
1779 case OPT_finstrument_functions_exclude_file_list_:
1780 add_comma_separated_to_vector
1781 (&flag_instrument_functions_exclude_files, arg);
1784 case OPT_fmessage_length_:
1785 pp_set_line_maximum_length (global_dc->printer, value);
1788 case OPT_fpack_struct_:
1789 if (value <= 0 || (value & (value - 1)) || value > 16)
1790 error ("structure alignment must be a small power of two, not %d", value);
1793 initial_max_fld_align = value;
1794 maximum_field_alignment = value * BITS_PER_UNIT;
1798 case OPT_fpeel_loops:
1799 flag_peel_loops_set = true;
1802 case OPT_fprofile_arcs:
1803 profile_arc_flag_set = true;
1806 case OPT_finline_functions:
1807 flag_inline_functions_set = true;
1810 case OPT_fprofile_dir_:
1811 profile_data_prefix = xstrdup (arg);
1814 case OPT_fprofile_use_:
1815 profile_data_prefix = xstrdup (arg);
1816 flag_profile_use = true;
1818 /* No break here - do -fprofile-use processing. */
1819 case OPT_fprofile_use:
1820 if (!flag_branch_probabilities_set)
1821 flag_branch_probabilities = value;
1822 if (!flag_profile_values_set)
1823 flag_profile_values = value;
1824 if (!flag_unroll_loops_set)
1825 flag_unroll_loops = value;
1826 if (!flag_peel_loops_set)
1827 flag_peel_loops = value;
1828 if (!flag_tracer_set)
1829 flag_tracer = value;
1830 if (!flag_value_profile_transformations_set)
1831 flag_value_profile_transformations = value;
1832 if (!flag_inline_functions_set)
1833 flag_inline_functions = value;
1836 case OPT_fprofile_generate_:
1837 profile_data_prefix = xstrdup (arg);
1839 /* No break here - do -fprofile-generate processing. */
1840 case OPT_fprofile_generate:
1841 if (!profile_arc_flag_set)
1842 profile_arc_flag = value;
1843 if (!flag_profile_values_set)
1844 flag_profile_values = value;
1845 if (!flag_value_profile_transformations_set)
1846 flag_value_profile_transformations = value;
1847 if (!flag_inline_functions_set)
1848 flag_inline_functions = value;
1851 case OPT_fprofile_values:
1852 flag_profile_values_set = true;
1855 case OPT_fvisibility_:
1857 if (!strcmp(arg, "default"))
1858 default_visibility = VISIBILITY_DEFAULT;
1859 else if (!strcmp(arg, "internal"))
1860 default_visibility = VISIBILITY_INTERNAL;
1861 else if (!strcmp(arg, "hidden"))
1862 default_visibility = VISIBILITY_HIDDEN;
1863 else if (!strcmp(arg, "protected"))
1864 default_visibility = VISIBILITY_PROTECTED;
1866 error ("unrecognized visibility value \"%s\"", arg);
1871 flag_value_profile_transformations_set = true;
1874 case OPT_frandom_seed:
1875 /* The real switch is -fno-random-seed. */
1878 set_random_seed (NULL);
1881 case OPT_frandom_seed_:
1882 set_random_seed (arg);
1885 case OPT_fsched_verbose_:
1886 #ifdef INSN_SCHEDULING
1887 fix_sched_param ("verbose", arg);
1893 case OPT_fsched_stalled_insns_:
1894 flag_sched_stalled_insns = value;
1895 if (flag_sched_stalled_insns == 0)
1896 flag_sched_stalled_insns = -1;
1899 case OPT_fsched_stalled_insns_dep_:
1900 flag_sched_stalled_insns_dep = value;
1903 case OPT_fstack_limit:
1904 /* The real switch is -fno-stack-limit. */
1907 stack_limit_rtx = NULL_RTX;
1910 case OPT_fstack_limit_register_:
1912 int reg = decode_reg_name (arg);
1914 error ("unrecognized register name \"%s\"", arg);
1916 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1920 case OPT_fstack_limit_symbol_:
1921 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1924 case OPT_ftree_vectorizer_verbose_:
1925 vect_set_verbosity_level (arg);
1928 case OPT_ftls_model_:
1929 if (!strcmp (arg, "global-dynamic"))
1930 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1931 else if (!strcmp (arg, "local-dynamic"))
1932 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1933 else if (!strcmp (arg, "initial-exec"))
1934 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1935 else if (!strcmp (arg, "local-exec"))
1936 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1938 warning (0, "unknown tls-model \"%s\"", arg);
1942 flag_tracer_set = true;
1945 case OPT_funroll_loops:
1946 flag_unroll_loops_set = true;
1950 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1954 set_debug_level (SDB_DEBUG, false, arg);
1958 set_debug_level (DWARF2_DEBUG, false, arg);
1962 set_debug_level (NO_DEBUG, 2, arg);
1967 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1971 set_debug_level (VMS_DEBUG, false, arg);
1976 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1980 asm_file_name = arg;
1983 case OPT_pedantic_errors:
1984 flag_pedantic_errors = pedantic = 1;
1987 case OPT_floop_optimize:
1988 case OPT_frerun_loop_opt:
1989 case OPT_fstrength_reduce:
1990 case OPT_ftree_store_copy_prop:
1991 case OPT_fforce_addr:
1992 case OPT_ftree_salias:
1993 /* These are no-ops, preserved for backward compatibility. */
1997 /* If the flag was handled in a standard way, assume the lack of
1998 processing here is intentional. */
1999 gcc_assert (cl_options[scode].flag_var);
2006 /* Handle --param NAME=VALUE. */
2008 handle_param (const char *carg)
2013 arg = xstrdup (carg);
2014 equal = strchr (arg, '=');
2016 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2019 value = integral_argument (equal + 1);
2021 error ("invalid --param value %qs", equal + 1);
2025 set_param_value (arg, value);
2032 /* Handle -W and -Wextra. */
2034 set_Wextra (int setting)
2036 extra_warnings = setting;
2038 /* We save the value of warn_uninitialized, since if they put
2039 -Wuninitialized on the command line, we need to generate a
2040 warning about not using it without also specifying -O. */
2042 warn_uninitialized = 0;
2043 else if (warn_uninitialized != 1)
2044 warn_uninitialized = 2;
2047 /* Used to set the level of strict aliasing warnings,
2048 when no level is specified (i.e., when -Wstrict-aliasing, and not
2049 -Wstrict-aliasing=level was given).
2050 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2051 and 0 otherwise. After calling this function, wstrict_aliasing will be
2052 set to the default value of -Wstrict_aliasing=level, currently 3. */
2054 set_Wstrict_aliasing (int onoff)
2056 gcc_assert (onoff == 0 || onoff == 1);
2058 warn_strict_aliasing = 3;
2060 warn_strict_aliasing = 0;
2063 /* The following routines are useful in setting all the flags that
2064 -ffast-math and -fno-fast-math imply. */
2066 set_fast_math_flags (int set)
2068 flag_unsafe_math_optimizations = set;
2069 set_unsafe_math_optimizations_flags (set);
2070 flag_finite_math_only = set;
2071 flag_errno_math = !set;
2074 flag_signaling_nans = 0;
2075 flag_rounding_math = 0;
2076 flag_cx_limited_range = 1;
2080 /* When -funsafe-math-optimizations is set the following
2081 flags are set as well. */
2083 set_unsafe_math_optimizations_flags (int set)
2085 flag_trapping_math = !set;
2086 flag_signed_zeros = !set;
2087 flag_associative_math = set;
2088 flag_reciprocal_math = set;
2091 /* Return true iff flags are set as if -ffast-math. */
2093 fast_math_flags_set_p (void)
2095 return (!flag_trapping_math
2096 && flag_unsafe_math_optimizations
2097 && flag_finite_math_only
2098 && !flag_signed_zeros
2099 && !flag_errno_math);
2102 /* Return true iff flags are set as if -ffast-math but using the flags stored
2103 in the struct cl_optimization structure. */
2105 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2107 return (!opt->flag_trapping_math
2108 && opt->flag_unsafe_math_optimizations
2109 && opt->flag_finite_math_only
2110 && !opt->flag_signed_zeros
2111 && !opt->flag_errno_math);
2114 /* Handle a debug output -g switch. EXTENDED is true or false to support
2115 extended output (2 is special and means "-ggdb" was given). */
2117 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2119 static bool type_explicit;
2121 use_gnu_debug_info_extensions = extended;
2123 if (type == NO_DEBUG)
2125 if (write_symbols == NO_DEBUG)
2127 write_symbols = PREFERRED_DEBUGGING_TYPE;
2131 #ifdef DWARF2_DEBUGGING_INFO
2132 write_symbols = DWARF2_DEBUG;
2133 #elif defined DBX_DEBUGGING_INFO
2134 write_symbols = DBX_DEBUG;
2138 if (write_symbols == NO_DEBUG)
2139 warning (0, "target system does not support debug output");
2144 /* Does it conflict with an already selected type? */
2145 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2146 error ("debug format \"%s\" conflicts with prior selection",
2147 debug_type_names[type]);
2148 write_symbols = type;
2149 type_explicit = true;
2152 /* A debug flag without a level defaults to level 2. */
2155 if (!debug_info_level)
2156 debug_info_level = 2;
2160 debug_info_level = integral_argument (arg);
2161 if (debug_info_level == (unsigned int) -1)
2162 error ("unrecognised debug output level \"%s\"", arg);
2163 else if (debug_info_level > 3)
2164 error ("debug output level %s is too high", arg);
2168 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2169 a simple on-off switch. */
2172 option_enabled (int opt_idx)
2174 const struct cl_option *option = &(cl_options[opt_idx]);
2176 if (option->flag_var)
2177 switch (option->var_type)
2180 return *(int *) option->flag_var != 0;
2183 return *(int *) option->flag_var == option->var_value;
2185 case CLVC_BIT_CLEAR:
2186 return (*(int *) option->flag_var & option->var_value) == 0;
2189 return (*(int *) option->flag_var & option->var_value) != 0;
2197 /* Fill STATE with the current state of option OPTION. Return true if
2198 there is some state to store. */
2201 get_option_state (int option, struct cl_option_state *state)
2203 if (cl_options[option].flag_var == 0)
2206 switch (cl_options[option].var_type)
2210 state->data = cl_options[option].flag_var;
2211 state->size = sizeof (int);
2214 case CLVC_BIT_CLEAR:
2216 state->ch = option_enabled (option);
2217 state->data = &state->ch;
2222 state->data = *(const char **) cl_options[option].flag_var;
2223 if (state->data == 0)
2225 state->size = strlen ((const char *) state->data) + 1;
2231 /* Enable a warning option as an error. This is used by -Werror= and
2232 also by legacy Werror-implicit-function-declaration. */
2235 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask)
2240 new_option = XNEWVEC (char, strlen (arg) + 2);
2241 new_option[0] = 'W';
2242 strcpy (new_option + 1, arg);
2243 option_index = find_opt (new_option, lang_mask);
2244 if (option_index == N_OPTS)
2246 error ("-Werror=%s: No option -%s", arg, new_option);
2250 int kind = value ? DK_ERROR : DK_WARNING;
2251 diagnostic_classify_diagnostic (global_dc, option_index, kind);
2253 /* -Werror=foo implies -Wfoo. */
2254 if (cl_options[option_index].var_type == CLVC_BOOLEAN
2255 && cl_options[option_index].flag_var
2256 && kind == DK_ERROR)
2257 *(int *) cl_options[option_index].flag_var = 1;