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 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 /* Hack for cooperation between set_Wunused and set_Wextra. */
67 static bool maybe_warn_unused_parameter
;
69 /* Type(s) of debugging information we are producing (if any). See
70 flags.h for the definitions of the different possible types of
71 debugging information. */
72 enum debug_info_type write_symbols
= NO_DEBUG
;
74 /* Level of debugging information we are producing. See flags.h for
75 the definitions of the different possible levels. */
76 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
78 /* A major contribution to object and executable size is debug
79 information size. A major contribution to debug information size
80 is struct descriptions replicated in several object files. The
81 following flags attempt to reduce this information. The basic
82 idea is to not emit struct debugging information in the current
83 compilation unit when that information will be generated by
84 another compilation unit.
86 Debug information for a struct defined in the current source
87 file should be generated in the object file. Likewise the
88 debug information for a struct defined in a header should be
89 generated in the object file of the corresponding source file.
90 Both of these case are handled when the base name of the file of
91 the struct definition matches the base name of the source file
92 of the current compilation unit. This matching emits minimal
93 struct debugging information.
95 The base file name matching rule above will fail to emit debug
96 information for structs defined in system headers. So a second
97 category of files includes system headers in addition to files
100 The remaining types of files are library headers and application
101 headers. We cannot currently distinguish these two types. */
103 enum debug_struct_file
105 DINFO_STRUCT_FILE_NONE
, /* Debug no structs. */
106 DINFO_STRUCT_FILE_BASE
, /* Debug structs defined in files with the
107 same base name as the compilation unit. */
108 DINFO_STRUCT_FILE_SYS
, /* Also debug structs defined in system
110 DINFO_STRUCT_FILE_ANY
/* Debug structs defined in all files. */
113 /* Generic structs (e.g. templates not explicitly specialized)
114 may not have a compilation unit associated with them, and so
115 may need to be treated differently from ordinary structs.
117 Structs only handled by reference (indirectly), will also usually
118 not need as much debugging information. */
120 static enum debug_struct_file debug_struct_ordinary
[DINFO_USAGE_NUM_ENUMS
]
121 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
122 static enum debug_struct_file debug_struct_generic
[DINFO_USAGE_NUM_ENUMS
]
123 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
125 /* Parse the -femit-struct-debug-detailed option value
126 and set the flag variables. */
128 #define MATCH( prefix, string ) \
129 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
130 ? ((string += sizeof prefix - 1), 1) : 0)
133 set_struct_debug_option (const char *spec
)
135 /* various labels for comparison */
136 static char dfn_lbl
[] = "dfn:", dir_lbl
[] = "dir:", ind_lbl
[] = "ind:";
137 static char ord_lbl
[] = "ord:", gen_lbl
[] = "gen:";
138 static char none_lbl
[] = "none", any_lbl
[] = "any";
139 static char base_lbl
[] = "base", sys_lbl
[] = "sys";
141 enum debug_struct_file files
= DINFO_STRUCT_FILE_ANY
;
142 /* Default is to apply to as much as possible. */
143 enum debug_info_usage usage
= DINFO_USAGE_NUM_ENUMS
;
144 int ord
= 1, gen
= 1;
147 if (MATCH (dfn_lbl
, spec
))
148 usage
= DINFO_USAGE_DFN
;
149 else if (MATCH (dir_lbl
, spec
))
150 usage
= DINFO_USAGE_DIR_USE
;
151 else if (MATCH (ind_lbl
, spec
))
152 usage
= DINFO_USAGE_IND_USE
;
154 /* Generics or not? */
155 if (MATCH (ord_lbl
, spec
))
157 else if (MATCH (gen_lbl
, spec
))
160 /* What allowable environment? */
161 if (MATCH (none_lbl
, spec
))
162 files
= DINFO_STRUCT_FILE_NONE
;
163 else if (MATCH (any_lbl
, spec
))
164 files
= DINFO_STRUCT_FILE_ANY
;
165 else if (MATCH (sys_lbl
, spec
))
166 files
= DINFO_STRUCT_FILE_SYS
;
167 else if (MATCH (base_lbl
, spec
))
168 files
= DINFO_STRUCT_FILE_BASE
;
170 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
173 /* Effect the specification. */
174 if (usage
== DINFO_USAGE_NUM_ENUMS
)
178 debug_struct_ordinary
[DINFO_USAGE_DFN
] = files
;
179 debug_struct_ordinary
[DINFO_USAGE_DIR_USE
] = files
;
180 debug_struct_ordinary
[DINFO_USAGE_IND_USE
] = files
;
184 debug_struct_generic
[DINFO_USAGE_DFN
] = files
;
185 debug_struct_generic
[DINFO_USAGE_DIR_USE
] = files
;
186 debug_struct_generic
[DINFO_USAGE_IND_USE
] = files
;
192 debug_struct_ordinary
[usage
] = files
;
194 debug_struct_generic
[usage
] = files
;
198 set_struct_debug_option (spec
+1);
201 /* No more -femit-struct-debug-detailed specifications.
204 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
206 if (debug_struct_ordinary
[DINFO_USAGE_DIR_USE
]
207 < debug_struct_ordinary
[DINFO_USAGE_IND_USE
]
208 || debug_struct_generic
[DINFO_USAGE_DIR_USE
]
209 < debug_struct_generic
[DINFO_USAGE_IND_USE
])
210 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
211 " as much as %<-femit-struct-debug-detailed=ind:...%>");
215 /* Find the base name of a path, stripping off both directories and
216 a single final extension. */
218 base_of_path (const char *path
, const char **base_out
)
220 const char *base
= path
;
222 const char *p
= path
;
226 if (IS_DIR_SEPARATOR(c
))
241 /* Match the base name of a file to the base name of a compilation unit. */
243 static const char *main_input_basename
;
244 static int main_input_baselength
;
247 matches_main_base (const char *path
)
249 /* Cache the last query. */
250 static const char *last_path
= NULL
;
251 static int last_match
= 0;
252 if (path
!= last_path
)
255 int length
= base_of_path (path
, &base
);
257 last_match
= (length
== main_input_baselength
258 && memcmp (base
, main_input_basename
, length
) == 0);
263 #ifdef DEBUG_DEBUG_STRUCT
266 dump_struct_debug (tree type
, enum debug_info_usage usage
,
267 enum debug_struct_file criterion
, int generic
,
268 int matches
, int result
)
270 /* Find the type name. */
271 tree type_decl
= TYPE_STUB_DECL (type
);
273 const char *name
= 0;
274 if (TREE_CODE (t
) == TYPE_DECL
)
277 name
= IDENTIFIER_POINTER (t
);
279 fprintf (stderr
, " struct %d %s %s %s %s %d %p %s\n",
281 DECL_IN_SYSTEM_HEADER (type_decl
) ? "sys" : "usr",
282 matches
? "bas" : "hdr",
283 generic
? "gen" : "ord",
284 usage
== DINFO_USAGE_DFN
? ";" :
285 usage
== DINFO_USAGE_DIR_USE
? "." : "*",
287 (void*) type_decl
, name
);
290 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
291 dump_struct_debug (type, usage, criterion, generic, matches, result)
295 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
302 should_emit_struct_debug (tree type
, enum debug_info_usage usage
)
304 enum debug_struct_file criterion
;
306 bool generic
= lang_hooks
.types
.generic_p (type
);
309 criterion
= debug_struct_generic
[usage
];
311 criterion
= debug_struct_ordinary
[usage
];
313 if (criterion
== DINFO_STRUCT_FILE_NONE
)
314 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
315 if (criterion
== DINFO_STRUCT_FILE_ANY
)
316 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
318 type_decl
= TYPE_STUB_DECL (type
);
320 if (criterion
== DINFO_STRUCT_FILE_SYS
&& DECL_IN_SYSTEM_HEADER (type_decl
))
321 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
323 if (matches_main_base (DECL_SOURCE_FILE (type_decl
)))
324 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, true, true);
325 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
328 /* Nonzero means use GNU-only extensions in the generated symbolic
329 debugging information. Currently, this only has an effect when
330 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
331 bool use_gnu_debug_info_extensions
;
333 /* The default visibility for all symbols (unless overridden) */
334 enum symbol_visibility default_visibility
= VISIBILITY_DEFAULT
;
336 /* Disable unit-at-a-time for frontends that might be still broken in this
339 bool no_unit_at_a_time_default
;
341 /* Global visibility options. */
342 struct visibility_flags visibility_options
;
344 /* What to print when a switch has no documentation. */
345 #ifdef ENABLE_CHECKING
346 static const char undocumented_msg
[] = N_("This switch lacks documentation");
348 static const char undocumented_msg
[] = "";
351 /* Used for bookkeeping on whether user set these flags so
352 -fprofile-use/-fprofile-generate does not use them. */
353 static bool profile_arc_flag_set
, flag_profile_values_set
;
354 static bool flag_unroll_loops_set
, flag_tracer_set
;
355 static bool flag_value_profile_transformations_set
;
356 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
357 static bool flag_inline_functions_set
;
359 /* Functions excluded from profiling. */
361 typedef char *char_p
; /* For DEF_VEC_P. */
363 DEF_VEC_ALLOC_P(char_p
,heap
);
365 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_functions
;
366 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_files
;
368 typedef const char *const_char_p
; /* For DEF_VEC_P. */
369 DEF_VEC_P(const_char_p
);
370 DEF_VEC_ALLOC_P(const_char_p
,heap
);
372 static VEC(const_char_p
,heap
) *ignored_options
;
374 /* Input file names. */
375 const char **in_fnames
;
376 unsigned num_in_fnames
;
378 static int common_handle_option (size_t scode
, const char *arg
, int value
,
379 unsigned int lang_mask
);
380 static void handle_param (const char *);
381 static void set_Wextra (int);
382 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
383 static char *write_langs (unsigned int lang_mask
);
384 static void complain_wrong_lang (const char *, const struct cl_option
*,
385 unsigned int lang_mask
);
386 static void handle_options (unsigned int, const char **, unsigned int);
387 static void set_debug_level (enum debug_info_type type
, int extended
,
390 /* If ARG is a non-negative integer made up solely of digits, return its
391 value, otherwise return -1. */
393 integral_argument (const char *arg
)
397 while (*p
&& ISDIGIT (*p
))
406 /* Return a malloced slash-separated list of languages in MASK. */
408 write_langs (unsigned int mask
)
410 unsigned int n
= 0, len
= 0;
411 const char *lang_name
;
414 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
415 if (mask
& (1U << n
))
416 len
+= strlen (lang_name
) + 1;
418 result
= XNEWVEC (char, len
);
420 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
421 if (mask
& (1U << n
))
425 strcpy (result
+ len
, lang_name
);
426 len
+= strlen (lang_name
);
434 /* Complain that switch OPT_INDEX does not apply to this front end. */
436 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
437 unsigned int lang_mask
)
439 char *ok_langs
, *bad_lang
;
441 ok_langs
= write_langs (option
->flags
);
442 bad_lang
= write_langs (lang_mask
);
444 /* Eventually this should become a hard error IMO. */
445 warning (0, "command line option \"%s\" is valid for %s but not for %s",
446 text
, ok_langs
, bad_lang
);
452 /* Buffer the unknown option described by the string OPT. Currently,
453 we only complain about unknown -Wno-* options if they may have
454 prevented a diagnostic. Otherwise, we just ignore them. */
456 static void postpone_unknown_option_error(const char *opt
)
458 VEC_safe_push (const_char_p
, heap
, ignored_options
, opt
);
461 /* Produce an error for each option previously buffered. */
463 void print_ignored_options (void)
465 location_t saved_loc
= input_location
;
469 while (!VEC_empty (const_char_p
, ignored_options
))
472 opt
= VEC_pop (const_char_p
, ignored_options
);
473 error ("unrecognized command line option \"%s\"", opt
);
476 input_location
= saved_loc
;
479 /* Handle the switch beginning at ARGV for the language indicated by
480 LANG_MASK. Returns the number of switches consumed. */
482 handle_option (const char **argv
, unsigned int lang_mask
)
485 const char *opt
, *arg
= 0;
488 unsigned int result
= 0;
489 const struct cl_option
*option
;
493 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
494 if (opt_index
== cl_options_count
495 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
496 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
498 /* Drop the "no-" from negative switches. */
499 size_t len
= strlen (opt
) - 3;
501 dup
= XNEWVEC (char, len
+ 1);
504 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
507 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
508 if (opt_index
== cl_options_count
&& opt
[1] == 'W')
510 /* We don't generate errors for unknown -Wno-* options
511 unless we issue diagnostics. */
512 postpone_unknown_option_error (argv
[0]);
518 if (opt_index
== cl_options_count
)
521 option
= &cl_options
[opt_index
];
523 /* Reject negative form of switches that don't take negatives as
525 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
528 /* We've recognized this switch. */
531 /* Check to see if the option is disabled for this configuration. */
532 if (option
->flags
& CL_DISABLED
)
534 error ("command line option %qs"
535 " is not supported by this configuration", opt
);
539 /* Sort out any argument the switch takes. */
540 if (option
->flags
& CL_JOINED
)
542 /* Have arg point to the original switch. This is because
543 some code, such as disable_builtin_function, expects its
544 argument to be persistent until the program exits. */
545 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
547 arg
+= strlen ("no-");
549 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
551 if (option
->flags
& CL_SEPARATE
)
557 /* Missing argument. */
561 else if (option
->flags
& CL_SEPARATE
)
567 /* Now we've swallowed any potential argument, complain if this
568 is a switch for a different front end. */
569 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
571 complain_wrong_lang (argv
[0], option
, lang_mask
);
574 else if ((option
->flags
& CL_TARGET
)
575 && (option
->flags
& CL_LANG_ALL
)
576 && !(option
->flags
& lang_mask
))
578 /* Complain for target flag language mismatches if any languages
580 complain_wrong_lang (argv
[0], option
, lang_mask
);
584 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
586 if (!lang_hooks
.missing_argument (opt
, opt_index
))
587 error ("missing argument to \"%s\"", opt
);
591 /* If the switch takes an integer, convert it. */
592 if (arg
&& (option
->flags
& CL_UINTEGER
))
594 value
= integral_argument (arg
);
597 error ("argument to \"%s\" should be a non-negative integer",
603 if (option
->flag_var
)
604 switch (option
->var_type
)
607 *(int *) option
->flag_var
= value
;
611 *(int *) option
->flag_var
= (value
613 : !option
->var_value
);
618 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
619 *(int *) option
->flag_var
|= option
->var_value
;
621 *(int *) option
->flag_var
&= ~option
->var_value
;
622 if (option
->flag_var
== &target_flags
)
623 target_flags_explicit
|= option
->var_value
;
627 *(const char **) option
->flag_var
= arg
;
631 if (option
->flags
& lang_mask
)
632 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
635 if (result
&& (option
->flags
& CL_COMMON
))
636 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
639 if (result
&& (option
->flags
& CL_TARGET
))
640 if (!targetm
.handle_option (opt_index
, arg
, value
))
649 /* Handle FILENAME from the command line. */
651 add_input_filename (const char *filename
)
654 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
655 in_fnames
[num_in_fnames
- 1] = filename
;
658 /* Add functions or file names to a vector of names to exclude from
662 add_instrument_functions_exclude_list (VEC(char_p
,heap
) **pvec
,
670 /* We never free this string. */
683 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
686 if (*r
== '\\' && r
[1] == ',')
694 if (*token_start
!= '\0')
695 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
698 /* Return whether we should exclude FNDECL from instrumentation. */
701 flag_instrument_functions_exclude_p (tree fndecl
)
703 if (VEC_length (char_p
, flag_instrument_functions_exclude_functions
) > 0)
709 name
= lang_hooks
.decl_printable_name (fndecl
, 0);
711 VEC_iterate (char_p
, flag_instrument_functions_exclude_functions
,
715 if (strstr (name
, s
) != NULL
)
720 if (VEC_length (char_p
, flag_instrument_functions_exclude_files
) > 0)
726 name
= DECL_SOURCE_FILE (fndecl
);
728 VEC_iterate (char_p
, flag_instrument_functions_exclude_files
, i
, s
);
731 if (strstr (name
, s
) != NULL
)
739 /* Decode and handle the vector of command line options. LANG_MASK
740 contains has a single bit set representing the current
743 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
747 for (i
= 1; i
< argc
; i
+= n
)
749 const char *opt
= argv
[i
];
751 /* Interpret "-" or a non-switch as a file name. */
752 if (opt
[0] != '-' || opt
[1] == '\0')
754 if (main_input_filename
== NULL
)
756 main_input_filename
= opt
;
757 main_input_baselength
758 = base_of_path (main_input_filename
, &main_input_basename
);
760 add_input_filename (opt
);
765 n
= handle_option (argv
+ i
, lang_mask
);
770 error ("unrecognized command line option \"%s\"", opt
);
775 /* Parse command line options and set default flag values. Do minimal
776 options processing. */
778 decode_options (unsigned int argc
, const char **argv
)
780 unsigned int i
, lang_mask
;
782 /* Perform language-specific options initialization. */
783 lang_mask
= lang_hooks
.init_options (argc
, argv
);
785 lang_hooks
.initialize_diagnostics (global_dc
);
787 /* Scan to see what optimization level has been specified. That will
788 determine the default value of many flags. */
789 for (i
= 1; i
< argc
; i
++)
791 if (!strcmp (argv
[i
], "-O"))
796 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
798 /* Handle -Os, -O2, -O3, -O69, ... */
799 const char *p
= &argv
[i
][2];
801 if ((p
[0] == 's') && (p
[1] == 0))
805 /* Optimizing for size forces optimize to be 2. */
810 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
811 if (optimize_val
!= -1)
813 optimize
= optimize_val
;
822 flag_merge_constants
= 0;
829 flag_delayed_branch
= 1;
831 #ifdef CAN_DEBUG_WITHOUT_FP
832 flag_omit_frame_pointer
= 1;
834 flag_guess_branch_prob
= 1;
835 flag_cprop_registers
= 1;
836 flag_if_conversion
= 1;
837 flag_if_conversion2
= 1;
838 flag_ipa_pure_const
= 1;
839 flag_ipa_reference
= 1;
840 flag_split_wide_types
= 1;
847 flag_tree_copyrename
= 1;
849 flag_tree_copy_prop
= 1;
851 if (!no_unit_at_a_time_default
)
852 flag_unit_at_a_time
= 1;
856 /* Loop header copying usually increases size of the code. This used
857 not to be true, since quite often it is possible to verify that
858 the condition is satisfied in the first iteration and therefore
859 to eliminate it. Jump threading handles these cases now. */
866 flag_inline_small_functions
= 1;
867 flag_thread_jumps
= 1;
868 flag_crossjumping
= 1;
869 flag_optimize_sibling_calls
= 1;
870 flag_forward_propagate
= 1;
871 flag_cse_follow_jumps
= 1;
873 flag_expensive_optimizations
= 1;
874 flag_rerun_cse_after_loop
= 1;
875 flag_caller_saves
= 1;
877 #ifdef INSN_SCHEDULING
878 flag_schedule_insns
= 1;
879 flag_schedule_insns_after_reload
= 1;
882 flag_strict_aliasing
= 1;
883 flag_strict_overflow
= 1;
884 flag_delete_null_pointer_checks
= 1;
885 flag_reorder_blocks
= 1;
886 flag_reorder_functions
= 1;
887 flag_tree_store_ccp
= 1;
892 /* Conditional DCE generates bigger code. */
893 flag_tree_builtin_call_dce
= 1;
894 /* PRE tends to generate bigger code. */
898 /* Allow more virtual operators to increase alias precision. */
899 set_param_value ("max-aliased-vops", 500);
904 flag_predictive_commoning
= 1;
905 flag_inline_functions
= 1;
906 flag_unswitch_loops
= 1;
907 flag_gcse_after_reload
= 1;
908 flag_tree_vectorize
= 1;
910 /* Allow even more virtual operators. */
911 set_param_value ("max-aliased-vops", 1000);
912 set_param_value ("avg-aliased-vops", 3);
915 if (optimize
< 2 || optimize_size
)
922 /* Don't reorder blocks when optimizing for size because extra
923 jump insns may be created; also barrier may create extra padding.
925 More correctly we should have a block reordering mode that tried
926 to minimize the combined size of all the jumps. This would more
927 or less automatically remove extra jumps, but would also try to
928 use more short jumps instead of long jumps. */
929 flag_reorder_blocks
= 0;
930 flag_reorder_blocks_and_partition
= 0;
935 /* Inlining of functions reducing size is a good idea regardless
936 of them being declared inline. */
937 flag_inline_functions
= 1;
939 /* We want to crossjump as much as possible. */
940 set_param_value ("min-crossjump-insns", 1);
943 /* Initialize whether `char' is signed. */
944 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
945 /* Set this to a special "uninitialized" value. The actual default is set
946 after target options have been processed. */
947 flag_short_enums
= 2;
949 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
951 target_flags
= targetm
.default_target_flags
;
953 /* Some tagets have ABI-specified unwind tables. */
954 flag_unwind_tables
= targetm
.unwind_tables_default
;
956 #ifdef OPTIMIZATION_OPTIONS
957 /* Allow default optimizations to be specified on a per-machine basis. */
958 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
961 handle_options (argc
, argv
, lang_mask
);
965 if (flag_pic
&& !flag_pie
)
968 if (flag_no_inline
== 2)
971 flag_really_no_inline
= flag_no_inline
;
973 /* Set flag_no_inline before the post_options () hook. The C front
974 ends use it to determine tree inlining defaults. FIXME: such
975 code should be lang-independent when all front ends use tree
976 inlining, in which case it, and this condition, should be moved
977 to the top of process_options() instead. */
980 /* Inlining does not work if not optimizing,
981 so force it not to be done. */
985 /* The c_decode_option function and decode_option hook set
986 this to `2' if -Wall is used, so we can avoid giving out
987 lots of errors for people who don't realize what -Wall does. */
988 if (warn_uninitialized
== 1)
989 warning (OPT_Wuninitialized
,
990 "-Wuninitialized is not supported without -O");
993 if (flag_really_no_inline
== 2)
994 flag_really_no_inline
= flag_no_inline
;
996 /* Inlining of functions called just once will only work if we can look
997 at the complete translation unit. */
998 if (flag_inline_functions_called_once
&& !flag_unit_at_a_time
)
1000 flag_inline_functions_called_once
= 0;
1001 warning (OPT_Wdisabled_optimization
,
1002 "-funit-at-a-time is required for inlining of functions "
1003 "that are only called once");
1006 /* The optimization to partition hot and cold basic blocks into separate
1007 sections of the .o and executable files does not work (currently)
1008 with exception handling. This is because there is no support for
1009 generating unwind info. If flag_exceptions is turned on we need to
1010 turn off the partitioning optimization. */
1012 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
1015 ("-freorder-blocks-and-partition does not work with exceptions");
1016 flag_reorder_blocks_and_partition
= 0;
1017 flag_reorder_blocks
= 1;
1020 /* If user requested unwind info, then turn off the partitioning
1023 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
1024 && flag_reorder_blocks_and_partition
)
1026 inform ("-freorder-blocks-and-partition does not support unwind info");
1027 flag_reorder_blocks_and_partition
= 0;
1028 flag_reorder_blocks
= 1;
1031 /* If the target requested unwind info, then turn off the partitioning
1032 optimization with a different message. Likewise, if the target does not
1033 support named sections. */
1035 if (flag_reorder_blocks_and_partition
1036 && (!targetm
.have_named_sections
1037 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
1040 ("-freorder-blocks-and-partition does not work on this architecture");
1041 flag_reorder_blocks_and_partition
= 0;
1042 flag_reorder_blocks
= 1;
1046 #define LEFT_COLUMN 27
1048 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1049 followed by word-wrapped HELP in a second column. */
1051 wrap_help (const char *help
,
1053 unsigned int item_width
,
1054 unsigned int columns
)
1056 unsigned int col_width
= LEFT_COLUMN
;
1057 unsigned int remaining
, room
, len
;
1059 remaining
= strlen (help
);
1063 room
= columns
- 3 - MAX (col_width
, item_width
);
1072 for (i
= 0; help
[i
]; i
++)
1074 if (i
>= room
&& len
!= remaining
)
1078 else if ((help
[i
] == '-' || help
[i
] == '/')
1079 && help
[i
+ 1] != ' '
1080 && i
> 0 && ISALPHA (help
[i
- 1]))
1085 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1087 while (help
[len
] == ' ')
1095 /* Print help for a specific front-end, etc. */
1097 print_filtered_help (unsigned int include_flags
,
1098 unsigned int exclude_flags
,
1099 unsigned int any_flags
,
1100 unsigned int columns
)
1104 static char *printed
= NULL
;
1106 bool displayed
= false;
1108 if (include_flags
== CL_PARAMS
)
1110 for (i
= 0; i
< LAST_PARAM
; i
++)
1112 const char *param
= compiler_params
[i
].option
;
1114 help
= compiler_params
[i
].help
;
1115 if (help
== NULL
|| *help
== '\0')
1117 if (exclude_flags
& CL_UNDOCUMENTED
)
1119 help
= undocumented_msg
;
1122 /* Get the translation. */
1125 wrap_help (help
, param
, strlen (param
), columns
);
1132 printed
= xcalloc (1, cl_options_count
);
1134 for (i
= 0; i
< cl_options_count
; i
++)
1136 static char new_help
[128];
1137 const struct cl_option
*option
= cl_options
+ i
;
1142 if (include_flags
== 0
1143 || ((option
->flags
& include_flags
) != include_flags
))
1145 if ((option
->flags
& any_flags
) == 0)
1149 /* Skip unwanted switches. */
1150 if ((option
->flags
& exclude_flags
) != 0)
1154 /* Skip switches that have already been printed. */
1160 help
= option
->help
;
1163 if (exclude_flags
& CL_UNDOCUMENTED
)
1165 help
= undocumented_msg
;
1168 /* Get the translation. */
1171 /* Find the gap between the name of the
1172 option and its descriptive text. */
1173 tab
= strchr (help
, '\t');
1182 opt
= option
->opt_text
;
1186 /* With the -Q option enabled we change the descriptive text associated
1187 with an option to be an indication of its current setting. */
1190 if (len
< (LEFT_COLUMN
+ 2))
1191 strcpy (new_help
, "\t\t");
1193 strcpy (new_help
, "\t");
1195 if (option
->flag_var
!= NULL
)
1197 if (option
->flags
& CL_JOINED
)
1199 if (option
->var_type
== CLVC_STRING
)
1201 if (* (const char **) option
->flag_var
!= NULL
)
1202 snprintf (new_help
+ strlen (new_help
),
1203 sizeof (new_help
) - strlen (new_help
),
1204 * (const char **) option
->flag_var
);
1207 sprintf (new_help
+ strlen (new_help
),
1208 "%#x", * (int *) option
->flag_var
);
1211 strcat (new_help
, option_enabled (i
)
1212 ? _("[enabled]") : _("[disabled]"));
1218 wrap_help (help
, opt
, len
, columns
);
1224 unsigned int langs
= include_flags
& CL_LANG_ALL
;
1227 printf (_(" No options with the desired characteristics were found\n"));
1232 /* PR 31349: Tell the user how to see all of the
1233 options supported by a specific front end. */
1234 for (i
= 0; (1U << i
) < CL_LANG_ALL
; i
++)
1235 if ((1U << i
) & langs
)
1236 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1237 lang_names
[i
], lang_names
[i
]);
1241 else if (! displayed
)
1242 printf (_(" All options with the desired characteristics have already been displayed\n"));
1247 /* Display help for a specified type of option.
1248 The options must have ALL of the INCLUDE_FLAGS set
1249 ANY of the flags in the ANY_FLAGS set
1250 and NONE of the EXCLUDE_FLAGS set. */
1252 print_specific_help (unsigned int include_flags
,
1253 unsigned int exclude_flags
,
1254 unsigned int any_flags
)
1256 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1257 const char * description
= NULL
;
1258 const char * descrip_extra
= "";
1261 static unsigned int columns
= 0;
1263 /* Sanity check: Make sure that we do not have more
1264 languages than we have bits available to enumerate them. */
1265 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
1267 /* If we have not done so already, obtain
1268 the desired maximum width of the output. */
1273 GET_ENVIRONMENT (p
, "COLUMNS");
1276 int value
= atoi (p
);
1283 /* Use a reasonable default. */
1287 /* Decide upon the title for the options that we are going to display. */
1288 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
1290 switch (flag
& include_flags
)
1296 description
= _("The following options are target specific");
1299 description
= _("The following options control compiler warning messages");
1301 case CL_OPTIMIZATION
:
1302 description
= _("The following options control optimizations");
1305 description
= _("The following options are language-independent");
1308 description
= _("The --param option recognizes the following as parameters");
1311 if (i
>= cl_lang_count
)
1313 if ((exclude_flags
& ((1U << cl_lang_count
) - 1)) != 0)
1314 description
= _("The following options are specific to just the language ");
1316 description
= _("The following options are supported by the language ");
1317 descrip_extra
= lang_names
[i
];
1322 if (description
== NULL
)
1326 if (include_flags
== CL_UNDOCUMENTED
)
1327 description
= _("The following options are not documented");
1330 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1337 if (any_flags
& all_langs_mask
)
1338 description
= _("The following options are language-related");
1340 description
= _("The following options are language-independent");
1344 printf ("%s%s:\n", description
, descrip_extra
);
1345 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
1348 /* Handle target- and language-independent options. Return zero to
1349 generate an "unknown option" message. Only options that need
1350 extra handling need to be listed here; if you simply want
1351 VALUE assigned to a variable, it happens automatically. */
1354 common_handle_option (size_t scode
, const char *arg
, int value
,
1355 unsigned int lang_mask
)
1357 static bool verbose
= false;
1358 enum opt_code code
= (enum opt_code
) scode
;
1373 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1374 unsigned int undoc_mask
;
1377 undoc_mask
= (verbose
| extra_warnings
) ? 0 : CL_UNDOCUMENTED
;
1378 /* First display any single language specific options. */
1379 for (i
= 0; i
< cl_lang_count
; i
++)
1381 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
1382 /* Next display any multi language specific options. */
1383 print_specific_help (0, undoc_mask
, all_langs_mask
);
1384 /* Then display any remaining, non-language options. */
1385 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
1386 print_specific_help (i
, undoc_mask
, 0);
1387 exit_after_options
= true;
1391 case OPT_ftarget_help
:
1392 case OPT__target_help
:
1393 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
1394 exit_after_options
= true;
1396 /* Allow the target a chance to give the user some additional information. */
1397 if (targetm
.target_help
)
1398 targetm
.target_help ();
1404 const char * a
= arg
;
1405 unsigned int include_flags
= 0;
1406 /* Note - by default we include undocumented options when listing
1407 specific classes. If you only want to see documented options
1408 then add ",^undocumented" to the --help= option. e.g.:
1410 --help=target,^undocumented */
1411 unsigned int exclude_flags
= 0;
1413 /* Walk along the argument string, parsing each word in turn.
1415 arg = [^]{word}[,{arg}]
1416 word = {optimizers|target|warnings|undocumented|
1417 params|common|<language>} */
1422 const char * string
;
1427 { "optimizers", CL_OPTIMIZATION
},
1428 { "target", CL_TARGET
},
1429 { "warnings", CL_WARNING
},
1430 { "undocumented", CL_UNDOCUMENTED
},
1431 { "params", CL_PARAMS
},
1432 { "joined", CL_JOINED
},
1433 { "separate", CL_SEPARATE
},
1434 { "common", CL_COMMON
},
1437 unsigned int * pflags
;
1439 unsigned int lang_flag
, specific_flag
;
1446 pflags
= & exclude_flags
;
1449 pflags
= & include_flags
;
1451 comma
= strchr (a
, ',');
1457 /* Check to see if the string matches an option class name. */
1458 for (i
= 0, specific_flag
= 0; specifics
[i
].string
!= NULL
; i
++)
1459 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1461 specific_flag
= specifics
[i
].flag
;
1465 /* Check to see if the string matches a language name.
1466 Note - we rely upon the alpha-sorted nature of the entries in
1467 the lang_names array, specifically that shorter names appear
1468 before their longer variants. (ie C before C++). That way
1469 when we are attempting to match --help=c for example we will
1470 match with C first and not C++. */
1471 for (i
= 0, lang_flag
= 0; i
< cl_lang_count
; i
++)
1472 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1474 lang_flag
= 1U << i
;
1478 if (specific_flag
!= 0)
1481 * pflags
|= specific_flag
;
1484 /* The option's argument matches both the start of a
1485 language name and the start of an option class name.
1486 We have a special case for when the user has
1487 specified "--help=c", but otherwise we have to issue
1489 if (strncasecmp (a
, "c", len
) == 0)
1490 * pflags
|= lang_flag
;
1493 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1497 else if (lang_flag
!= 0)
1498 * pflags
|= lang_flag
;
1501 "warning: unrecognized argument to --help= option: %.*s\n",
1510 print_specific_help (include_flags
, exclude_flags
, 0);
1511 exit_after_options
= true;
1516 print_version (stderr
, "");
1517 exit_after_options
= true;
1521 g_switch_value
= value
;
1522 g_switch_set
= true;
1527 /* Currently handled in a prescan. */
1531 /* For backward compatibility, -W is the same as -Wextra. */
1536 enable_warning_as_error (arg
, value
, lang_mask
);
1543 case OPT_Wlarger_than_
:
1544 /* This form corresponds to -Wlarger-than-.
1545 Kept for backward compatibility.
1546 Don't use it as the first argument of warning(). */
1548 case OPT_Wlarger_than_eq
:
1549 larger_than_size
= value
;
1550 warn_larger_than
= value
!= -1;
1553 case OPT_Wframe_larger_than_
:
1554 frame_larger_than_size
= value
;
1555 warn_frame_larger_than
= value
!= -1;
1558 case OPT_Wstrict_aliasing
:
1559 set_Wstrict_aliasing (value
);
1562 case OPT_Wstrict_aliasing_
:
1563 warn_strict_aliasing
= value
;
1566 case OPT_Wstrict_overflow
:
1567 warn_strict_overflow
= (value
1568 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1572 case OPT_Wstrict_overflow_
:
1573 warn_strict_overflow
= value
;
1577 set_Wunused (value
);
1582 aux_info_file_name
= arg
;
1583 flag_gen_aux_info
= 1;
1587 aux_base_name
= arg
;
1590 case OPT_auxbase_strip
:
1592 char *tmp
= xstrdup (arg
);
1593 strip_off_ending (tmp
, strlen (tmp
));
1595 aux_base_name
= tmp
;
1600 decode_d_option (arg
);
1604 dump_base_name
= arg
;
1607 case OPT_falign_functions_
:
1608 align_functions
= value
;
1611 case OPT_falign_jumps_
:
1612 align_jumps
= value
;
1615 case OPT_falign_labels_
:
1616 align_labels
= value
;
1619 case OPT_falign_loops_
:
1620 align_loops
= value
;
1623 case OPT_fbranch_probabilities
:
1624 flag_branch_probabilities_set
= true;
1627 case OPT_fcall_used_
:
1628 fix_register (arg
, 0, 1);
1631 case OPT_fcall_saved_
:
1632 fix_register (arg
, 0, 0);
1636 dbg_cnt_process_opt (arg
);
1639 case OPT_fdbg_cnt_list
:
1640 dbg_cnt_list_all_counters ();
1643 case OPT_fdebug_prefix_map_
:
1644 add_debug_prefix_map (arg
);
1647 case OPT_fdiagnostics_show_location_
:
1648 if (!strcmp (arg
, "once"))
1649 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1650 else if (!strcmp (arg
, "every-line"))
1651 diagnostic_prefixing_rule (global_dc
)
1652 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1657 case OPT_fdiagnostics_show_option
:
1658 global_dc
->show_option_requested
= true;
1662 if (!dump_switch_p (arg
))
1666 case OPT_ffast_math
:
1667 set_fast_math_flags (value
);
1670 case OPT_funsafe_math_optimizations
:
1671 set_unsafe_math_optimizations_flags (value
);
1675 fix_register (arg
, 1, 1);
1678 case OPT_finline_limit_
:
1679 case OPT_finline_limit_eq
:
1680 set_param_value ("max-inline-insns-single", value
/ 2);
1681 set_param_value ("max-inline-insns-auto", value
/ 2);
1684 case OPT_finstrument_functions_exclude_function_list_
:
1685 add_instrument_functions_exclude_list
1686 (&flag_instrument_functions_exclude_functions
, arg
);
1689 case OPT_finstrument_functions_exclude_file_list_
:
1690 add_instrument_functions_exclude_list
1691 (&flag_instrument_functions_exclude_files
, arg
);
1694 case OPT_fmessage_length_
:
1695 pp_set_line_maximum_length (global_dc
->printer
, value
);
1698 case OPT_fpack_struct_
:
1699 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1700 error ("structure alignment must be a small power of two, not %d", value
);
1703 initial_max_fld_align
= value
;
1704 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1708 case OPT_fpeel_loops
:
1709 flag_peel_loops_set
= true;
1712 case OPT_fprofile_arcs
:
1713 profile_arc_flag_set
= true;
1716 case OPT_finline_functions
:
1717 flag_inline_functions_set
= true;
1720 case OPT_fprofile_dir_
:
1721 profile_data_prefix
= xstrdup (arg
);
1724 case OPT_fprofile_use_
:
1725 profile_data_prefix
= xstrdup (arg
);
1726 flag_profile_use
= true;
1728 /* No break here - do -fprofile-use processing. */
1729 case OPT_fprofile_use
:
1730 if (!flag_branch_probabilities_set
)
1731 flag_branch_probabilities
= value
;
1732 if (!flag_profile_values_set
)
1733 flag_profile_values
= value
;
1734 if (!flag_unroll_loops_set
)
1735 flag_unroll_loops
= value
;
1736 if (!flag_peel_loops_set
)
1737 flag_peel_loops
= value
;
1738 if (!flag_tracer_set
)
1739 flag_tracer
= value
;
1740 if (!flag_value_profile_transformations_set
)
1741 flag_value_profile_transformations
= value
;
1742 if (!flag_inline_functions_set
)
1743 flag_inline_functions
= value
;
1746 case OPT_fprofile_generate_
:
1747 profile_data_prefix
= xstrdup (arg
);
1749 /* No break here - do -fprofile-generate processing. */
1750 case OPT_fprofile_generate
:
1751 if (!profile_arc_flag_set
)
1752 profile_arc_flag
= value
;
1753 if (!flag_profile_values_set
)
1754 flag_profile_values
= value
;
1755 if (!flag_value_profile_transformations_set
)
1756 flag_value_profile_transformations
= value
;
1757 if (!flag_inline_functions_set
)
1758 flag_inline_functions
= value
;
1761 case OPT_fprofile_values
:
1762 flag_profile_values_set
= true;
1765 case OPT_fvisibility_
:
1767 if (!strcmp(arg
, "default"))
1768 default_visibility
= VISIBILITY_DEFAULT
;
1769 else if (!strcmp(arg
, "internal"))
1770 default_visibility
= VISIBILITY_INTERNAL
;
1771 else if (!strcmp(arg
, "hidden"))
1772 default_visibility
= VISIBILITY_HIDDEN
;
1773 else if (!strcmp(arg
, "protected"))
1774 default_visibility
= VISIBILITY_PROTECTED
;
1776 error ("unrecognized visibility value \"%s\"", arg
);
1781 flag_value_profile_transformations_set
= true;
1784 case OPT_frandom_seed
:
1785 /* The real switch is -fno-random-seed. */
1788 set_random_seed (NULL
);
1791 case OPT_frandom_seed_
:
1792 set_random_seed (arg
);
1795 case OPT_fsched_verbose_
:
1796 #ifdef INSN_SCHEDULING
1797 fix_sched_param ("verbose", arg
);
1803 case OPT_fsched_stalled_insns_
:
1804 flag_sched_stalled_insns
= value
;
1805 if (flag_sched_stalled_insns
== 0)
1806 flag_sched_stalled_insns
= -1;
1809 case OPT_fsched_stalled_insns_dep_
:
1810 flag_sched_stalled_insns_dep
= value
;
1813 case OPT_fstack_limit
:
1814 /* The real switch is -fno-stack-limit. */
1817 stack_limit_rtx
= NULL_RTX
;
1820 case OPT_fstack_limit_register_
:
1822 int reg
= decode_reg_name (arg
);
1824 error ("unrecognized register name \"%s\"", arg
);
1826 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1830 case OPT_fstack_limit_symbol_
:
1831 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1834 case OPT_ftree_vectorizer_verbose_
:
1835 vect_set_verbosity_level (arg
);
1838 case OPT_ftls_model_
:
1839 if (!strcmp (arg
, "global-dynamic"))
1840 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1841 else if (!strcmp (arg
, "local-dynamic"))
1842 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1843 else if (!strcmp (arg
, "initial-exec"))
1844 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1845 else if (!strcmp (arg
, "local-exec"))
1846 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1848 warning (0, "unknown tls-model \"%s\"", arg
);
1852 flag_tracer_set
= true;
1855 case OPT_funroll_loops
:
1856 flag_unroll_loops_set
= true;
1860 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1864 set_debug_level (SDB_DEBUG
, false, arg
);
1868 set_debug_level (DWARF2_DEBUG
, false, arg
);
1872 set_debug_level (NO_DEBUG
, 2, arg
);
1877 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1881 set_debug_level (VMS_DEBUG
, false, arg
);
1886 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1890 asm_file_name
= arg
;
1893 case OPT_pedantic_errors
:
1894 flag_pedantic_errors
= pedantic
= 1;
1897 case OPT_floop_optimize
:
1898 case OPT_frerun_loop_opt
:
1899 case OPT_fstrength_reduce
:
1900 case OPT_ftree_store_copy_prop
:
1901 case OPT_fforce_addr
:
1902 case OPT_ftree_salias
:
1903 /* These are no-ops, preserved for backward compatibility. */
1907 /* If the flag was handled in a standard way, assume the lack of
1908 processing here is intentional. */
1909 gcc_assert (cl_options
[scode
].flag_var
);
1916 /* Handle --param NAME=VALUE. */
1918 handle_param (const char *carg
)
1923 arg
= xstrdup (carg
);
1924 equal
= strchr (arg
, '=');
1926 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1929 value
= integral_argument (equal
+ 1);
1931 error ("invalid --param value %qs", equal
+ 1);
1935 set_param_value (arg
, value
);
1942 /* Handle -W and -Wextra. */
1944 set_Wextra (int setting
)
1946 extra_warnings
= setting
;
1947 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1949 /* We save the value of warn_uninitialized, since if they put
1950 -Wuninitialized on the command line, we need to generate a
1951 warning about not using it without also specifying -O. */
1953 warn_uninitialized
= 0;
1954 else if (warn_uninitialized
!= 1)
1955 warn_uninitialized
= 2;
1958 /* Initialize unused warning flags. */
1960 set_Wunused (int setting
)
1962 warn_unused_function
= setting
;
1963 warn_unused_label
= setting
;
1964 /* Unused function parameter warnings are reported when either
1965 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1966 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1967 otherwise set maybe_warn_extra_parameter, which will be picked up
1969 maybe_warn_unused_parameter
= setting
;
1970 warn_unused_parameter
= (setting
&& extra_warnings
);
1971 warn_unused_variable
= setting
;
1972 warn_unused_value
= setting
;
1975 /* Used to set the level of strict aliasing warnings,
1976 when no level is specified (i.e., when -Wstrict-aliasing, and not
1977 -Wstrict-aliasing=level was given).
1978 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
1979 and 0 otherwise. After calling this function, wstrict_aliasing will be
1980 set to the default value of -Wstrict_aliasing=level, currently 3. */
1982 set_Wstrict_aliasing (int onoff
)
1984 gcc_assert (onoff
== 0 || onoff
== 1);
1986 warn_strict_aliasing
= 3;
1988 warn_strict_aliasing
= 0;
1991 /* The following routines are useful in setting all the flags that
1992 -ffast-math and -fno-fast-math imply. */
1994 set_fast_math_flags (int set
)
1996 flag_unsafe_math_optimizations
= set
;
1997 set_unsafe_math_optimizations_flags (set
);
1998 flag_finite_math_only
= set
;
1999 flag_errno_math
= !set
;
2002 flag_signaling_nans
= 0;
2003 flag_rounding_math
= 0;
2004 flag_cx_limited_range
= 1;
2008 /* When -funsafe-math-optimizations is set the following
2009 flags are set as well. */
2011 set_unsafe_math_optimizations_flags (int set
)
2013 flag_trapping_math
= !set
;
2014 flag_signed_zeros
= !set
;
2015 flag_associative_math
= set
;
2016 flag_reciprocal_math
= set
;
2019 /* Return true iff flags are set as if -ffast-math. */
2021 fast_math_flags_set_p (void)
2023 return (!flag_trapping_math
2024 && flag_unsafe_math_optimizations
2025 && flag_finite_math_only
2026 && !flag_signed_zeros
2027 && !flag_errno_math
);
2030 /* Handle a debug output -g switch. EXTENDED is true or false to support
2031 extended output (2 is special and means "-ggdb" was given). */
2033 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
2035 static bool type_explicit
;
2037 use_gnu_debug_info_extensions
= extended
;
2039 if (type
== NO_DEBUG
)
2041 if (write_symbols
== NO_DEBUG
)
2043 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
2047 #ifdef DWARF2_DEBUGGING_INFO
2048 write_symbols
= DWARF2_DEBUG
;
2049 #elif defined DBX_DEBUGGING_INFO
2050 write_symbols
= DBX_DEBUG
;
2054 if (write_symbols
== NO_DEBUG
)
2055 warning (0, "target system does not support debug output");
2060 /* Does it conflict with an already selected type? */
2061 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
2062 error ("debug format \"%s\" conflicts with prior selection",
2063 debug_type_names
[type
]);
2064 write_symbols
= type
;
2065 type_explicit
= true;
2068 /* A debug flag without a level defaults to level 2. */
2071 if (!debug_info_level
)
2072 debug_info_level
= 2;
2076 debug_info_level
= integral_argument (arg
);
2077 if (debug_info_level
== (unsigned int) -1)
2078 error ("unrecognised debug output level \"%s\"", arg
);
2079 else if (debug_info_level
> 3)
2080 error ("debug output level %s is too high", arg
);
2084 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2085 a simple on-off switch. */
2088 option_enabled (int opt_idx
)
2090 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
2092 if (option
->flag_var
)
2093 switch (option
->var_type
)
2096 return *(int *) option
->flag_var
!= 0;
2099 return *(int *) option
->flag_var
== option
->var_value
;
2101 case CLVC_BIT_CLEAR
:
2102 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
2105 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
2113 /* Fill STATE with the current state of option OPTION. Return true if
2114 there is some state to store. */
2117 get_option_state (int option
, struct cl_option_state
*state
)
2119 if (cl_options
[option
].flag_var
== 0)
2122 switch (cl_options
[option
].var_type
)
2126 state
->data
= cl_options
[option
].flag_var
;
2127 state
->size
= sizeof (int);
2130 case CLVC_BIT_CLEAR
:
2132 state
->ch
= option_enabled (option
);
2133 state
->data
= &state
->ch
;
2138 state
->data
= *(const char **) cl_options
[option
].flag_var
;
2139 if (state
->data
== 0)
2141 state
->size
= strlen (state
->data
) + 1;
2147 /* Enable a warning option as an error. This is used by -Werror= and
2148 also by legacy Werror-implicit-function-declaration. */
2151 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
)
2156 new_option
= XNEWVEC (char, strlen (arg
) + 2);
2157 new_option
[0] = 'W';
2158 strcpy (new_option
+ 1, arg
);
2159 option_index
= find_opt (new_option
, lang_mask
);
2160 if (option_index
== N_OPTS
)
2162 error ("-Werror=%s: No option -%s", arg
, new_option
);
2166 int kind
= value
? DK_ERROR
: DK_WARNING
;
2167 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
2169 /* -Werror=foo implies -Wfoo. */
2170 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
2171 && cl_options
[option_index
].flag_var
2172 && kind
== DK_ERROR
)
2173 *(int *) cl_options
[option_index
].flag_var
= 1;