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 /* PRE tends to generate bigger code. */
896 /* Allow more virtual operators to increase alias precision. */
897 set_param_value ("max-aliased-vops", 500);
902 flag_predictive_commoning
= 1;
903 flag_inline_functions
= 1;
904 flag_unswitch_loops
= 1;
905 flag_gcse_after_reload
= 1;
906 flag_tree_vectorize
= 1;
908 /* Allow even more virtual operators. */
909 set_param_value ("max-aliased-vops", 1000);
910 set_param_value ("avg-aliased-vops", 3);
913 if (optimize
< 2 || optimize_size
)
920 /* Don't reorder blocks when optimizing for size because extra
921 jump insns may be created; also barrier may create extra padding.
923 More correctly we should have a block reordering mode that tried
924 to minimize the combined size of all the jumps. This would more
925 or less automatically remove extra jumps, but would also try to
926 use more short jumps instead of long jumps. */
927 flag_reorder_blocks
= 0;
928 flag_reorder_blocks_and_partition
= 0;
933 /* Inlining of functions reducing size is a good idea regardless
934 of them being declared inline. */
935 flag_inline_functions
= 1;
937 /* We want to crossjump as much as possible. */
938 set_param_value ("min-crossjump-insns", 1);
941 /* Initialize whether `char' is signed. */
942 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
943 /* Set this to a special "uninitialized" value. The actual default is set
944 after target options have been processed. */
945 flag_short_enums
= 2;
947 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
949 target_flags
= targetm
.default_target_flags
;
951 /* Some tagets have ABI-specified unwind tables. */
952 flag_unwind_tables
= targetm
.unwind_tables_default
;
954 #ifdef OPTIMIZATION_OPTIONS
955 /* Allow default optimizations to be specified on a per-machine basis. */
956 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
959 handle_options (argc
, argv
, lang_mask
);
963 if (flag_pic
&& !flag_pie
)
966 if (flag_no_inline
== 2)
969 flag_really_no_inline
= flag_no_inline
;
971 /* Set flag_no_inline before the post_options () hook. The C front
972 ends use it to determine tree inlining defaults. FIXME: such
973 code should be lang-independent when all front ends use tree
974 inlining, in which case it, and this condition, should be moved
975 to the top of process_options() instead. */
978 /* Inlining does not work if not optimizing,
979 so force it not to be done. */
983 /* The c_decode_option function and decode_option hook set
984 this to `2' if -Wall is used, so we can avoid giving out
985 lots of errors for people who don't realize what -Wall does. */
986 if (warn_uninitialized
== 1)
987 warning (OPT_Wuninitialized
,
988 "-Wuninitialized is not supported without -O");
991 if (flag_really_no_inline
== 2)
992 flag_really_no_inline
= flag_no_inline
;
994 /* Inlining of functions called just once will only work if we can look
995 at the complete translation unit. */
996 if (flag_inline_functions_called_once
&& !flag_unit_at_a_time
)
998 flag_inline_functions_called_once
= 0;
999 warning (OPT_Wdisabled_optimization
,
1000 "-funit-at-a-time is required for inlining of functions "
1001 "that are only called once");
1004 /* The optimization to partition hot and cold basic blocks into separate
1005 sections of the .o and executable files does not work (currently)
1006 with exception handling. This is because there is no support for
1007 generating unwind info. If flag_exceptions is turned on we need to
1008 turn off the partitioning optimization. */
1010 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
1013 ("-freorder-blocks-and-partition does not work with exceptions");
1014 flag_reorder_blocks_and_partition
= 0;
1015 flag_reorder_blocks
= 1;
1018 /* If user requested unwind info, then turn off the partitioning
1021 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
1022 && flag_reorder_blocks_and_partition
)
1024 inform ("-freorder-blocks-and-partition does not support unwind info");
1025 flag_reorder_blocks_and_partition
= 0;
1026 flag_reorder_blocks
= 1;
1029 /* If the target requested unwind info, then turn off the partitioning
1030 optimization with a different message. Likewise, if the target does not
1031 support named sections. */
1033 if (flag_reorder_blocks_and_partition
1034 && (!targetm
.have_named_sections
1035 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
1038 ("-freorder-blocks-and-partition does not work on this architecture");
1039 flag_reorder_blocks_and_partition
= 0;
1040 flag_reorder_blocks
= 1;
1043 #ifndef IRA_COVER_CLASSES
1046 inform ("-fira does not work on this architecture");
1052 #define LEFT_COLUMN 27
1054 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1055 followed by word-wrapped HELP in a second column. */
1057 wrap_help (const char *help
,
1059 unsigned int item_width
,
1060 unsigned int columns
)
1062 unsigned int col_width
= LEFT_COLUMN
;
1063 unsigned int remaining
, room
, len
;
1065 remaining
= strlen (help
);
1069 room
= columns
- 3 - MAX (col_width
, item_width
);
1078 for (i
= 0; help
[i
]; i
++)
1080 if (i
>= room
&& len
!= remaining
)
1084 else if ((help
[i
] == '-' || help
[i
] == '/')
1085 && help
[i
+ 1] != ' '
1086 && i
> 0 && ISALPHA (help
[i
- 1]))
1091 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1093 while (help
[len
] == ' ')
1101 /* Print help for a specific front-end, etc. */
1103 print_filtered_help (unsigned int include_flags
,
1104 unsigned int exclude_flags
,
1105 unsigned int any_flags
,
1106 unsigned int columns
)
1110 static char *printed
= NULL
;
1112 bool displayed
= false;
1114 if (include_flags
== CL_PARAMS
)
1116 for (i
= 0; i
< LAST_PARAM
; i
++)
1118 const char *param
= compiler_params
[i
].option
;
1120 help
= compiler_params
[i
].help
;
1121 if (help
== NULL
|| *help
== '\0')
1123 if (exclude_flags
& CL_UNDOCUMENTED
)
1125 help
= undocumented_msg
;
1128 /* Get the translation. */
1131 wrap_help (help
, param
, strlen (param
), columns
);
1138 printed
= xcalloc (1, cl_options_count
);
1140 for (i
= 0; i
< cl_options_count
; i
++)
1142 static char new_help
[128];
1143 const struct cl_option
*option
= cl_options
+ i
;
1148 if (include_flags
== 0
1149 || ((option
->flags
& include_flags
) != include_flags
))
1151 if ((option
->flags
& any_flags
) == 0)
1155 /* Skip unwanted switches. */
1156 if ((option
->flags
& exclude_flags
) != 0)
1160 /* Skip switches that have already been printed. */
1166 help
= option
->help
;
1169 if (exclude_flags
& CL_UNDOCUMENTED
)
1171 help
= undocumented_msg
;
1174 /* Get the translation. */
1177 /* Find the gap between the name of the
1178 option and its descriptive text. */
1179 tab
= strchr (help
, '\t');
1188 opt
= option
->opt_text
;
1192 /* With the -Q option enabled we change the descriptive text associated
1193 with an option to be an indication of its current setting. */
1196 if (len
< (LEFT_COLUMN
+ 2))
1197 strcpy (new_help
, "\t\t");
1199 strcpy (new_help
, "\t");
1201 if (option
->flag_var
!= NULL
)
1203 if (option
->flags
& CL_JOINED
)
1205 if (option
->var_type
== CLVC_STRING
)
1207 if (* (const char **) option
->flag_var
!= NULL
)
1208 snprintf (new_help
+ strlen (new_help
),
1209 sizeof (new_help
) - strlen (new_help
),
1210 * (const char **) option
->flag_var
);
1213 sprintf (new_help
+ strlen (new_help
),
1214 "%#x", * (int *) option
->flag_var
);
1217 strcat (new_help
, option_enabled (i
)
1218 ? _("[enabled]") : _("[disabled]"));
1224 wrap_help (help
, opt
, len
, columns
);
1230 unsigned int langs
= include_flags
& CL_LANG_ALL
;
1233 printf (_(" No options with the desired characteristics were found\n"));
1238 /* PR 31349: Tell the user how to see all of the
1239 options supported by a specific front end. */
1240 for (i
= 0; (1U << i
) < CL_LANG_ALL
; i
++)
1241 if ((1U << i
) & langs
)
1242 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1243 lang_names
[i
], lang_names
[i
]);
1247 else if (! displayed
)
1248 printf (_(" All options with the desired characteristics have already been displayed\n"));
1253 /* Display help for a specified type of option.
1254 The options must have ALL of the INCLUDE_FLAGS set
1255 ANY of the flags in the ANY_FLAGS set
1256 and NONE of the EXCLUDE_FLAGS set. */
1258 print_specific_help (unsigned int include_flags
,
1259 unsigned int exclude_flags
,
1260 unsigned int any_flags
)
1262 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1263 const char * description
= NULL
;
1264 const char * descrip_extra
= "";
1267 static unsigned int columns
= 0;
1269 /* Sanity check: Make sure that we do not have more
1270 languages than we have bits available to enumerate them. */
1271 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
1273 /* If we have not done so already, obtain
1274 the desired maximum width of the output. */
1279 GET_ENVIRONMENT (p
, "COLUMNS");
1282 int value
= atoi (p
);
1289 /* Use a reasonable default. */
1293 /* Decide upon the title for the options that we are going to display. */
1294 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
1296 switch (flag
& include_flags
)
1302 description
= _("The following options are target specific");
1305 description
= _("The following options control compiler warning messages");
1307 case CL_OPTIMIZATION
:
1308 description
= _("The following options control optimizations");
1311 description
= _("The following options are language-independent");
1314 description
= _("The --param option recognizes the following as parameters");
1317 if (i
>= cl_lang_count
)
1319 if ((exclude_flags
& ((1U << cl_lang_count
) - 1)) != 0)
1320 description
= _("The following options are specific to just the language ");
1322 description
= _("The following options are supported by the language ");
1323 descrip_extra
= lang_names
[i
];
1328 if (description
== NULL
)
1332 if (include_flags
== CL_UNDOCUMENTED
)
1333 description
= _("The following options are not documented");
1336 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1343 if (any_flags
& all_langs_mask
)
1344 description
= _("The following options are language-related");
1346 description
= _("The following options are language-independent");
1350 printf ("%s%s:\n", description
, descrip_extra
);
1351 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
1354 /* Handle target- and language-independent options. Return zero to
1355 generate an "unknown option" message. Only options that need
1356 extra handling need to be listed here; if you simply want
1357 VALUE assigned to a variable, it happens automatically. */
1360 common_handle_option (size_t scode
, const char *arg
, int value
,
1361 unsigned int lang_mask
)
1363 static bool verbose
= false;
1364 enum opt_code code
= (enum opt_code
) scode
;
1379 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1380 unsigned int undoc_mask
;
1383 undoc_mask
= (verbose
| extra_warnings
) ? 0 : CL_UNDOCUMENTED
;
1384 /* First display any single language specific options. */
1385 for (i
= 0; i
< cl_lang_count
; i
++)
1387 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
1388 /* Next display any multi language specific options. */
1389 print_specific_help (0, undoc_mask
, all_langs_mask
);
1390 /* Then display any remaining, non-language options. */
1391 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
1392 print_specific_help (i
, undoc_mask
, 0);
1393 exit_after_options
= true;
1397 case OPT_ftarget_help
:
1398 case OPT__target_help
:
1399 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
1400 exit_after_options
= true;
1402 /* Allow the target a chance to give the user some additional information. */
1403 if (targetm
.target_help
)
1404 targetm
.target_help ();
1410 const char * a
= arg
;
1411 unsigned int include_flags
= 0;
1412 /* Note - by default we include undocumented options when listing
1413 specific classes. If you only want to see documented options
1414 then add ",^undocumented" to the --help= option. e.g.:
1416 --help=target,^undocumented */
1417 unsigned int exclude_flags
= 0;
1419 /* Walk along the argument string, parsing each word in turn.
1421 arg = [^]{word}[,{arg}]
1422 word = {optimizers|target|warnings|undocumented|
1423 params|common|<language>} */
1428 const char * string
;
1433 { "optimizers", CL_OPTIMIZATION
},
1434 { "target", CL_TARGET
},
1435 { "warnings", CL_WARNING
},
1436 { "undocumented", CL_UNDOCUMENTED
},
1437 { "params", CL_PARAMS
},
1438 { "joined", CL_JOINED
},
1439 { "separate", CL_SEPARATE
},
1440 { "common", CL_COMMON
},
1443 unsigned int * pflags
;
1445 unsigned int lang_flag
, specific_flag
;
1452 pflags
= & exclude_flags
;
1455 pflags
= & include_flags
;
1457 comma
= strchr (a
, ',');
1463 /* Check to see if the string matches an option class name. */
1464 for (i
= 0, specific_flag
= 0; specifics
[i
].string
!= NULL
; i
++)
1465 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1467 specific_flag
= specifics
[i
].flag
;
1471 /* Check to see if the string matches a language name.
1472 Note - we rely upon the alpha-sorted nature of the entries in
1473 the lang_names array, specifically that shorter names appear
1474 before their longer variants. (ie C before C++). That way
1475 when we are attempting to match --help=c for example we will
1476 match with C first and not C++. */
1477 for (i
= 0, lang_flag
= 0; i
< cl_lang_count
; i
++)
1478 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1480 lang_flag
= 1U << i
;
1484 if (specific_flag
!= 0)
1487 * pflags
|= specific_flag
;
1490 /* The option's argument matches both the start of a
1491 language name and the start of an option class name.
1492 We have a special case for when the user has
1493 specified "--help=c", but otherwise we have to issue
1495 if (strncasecmp (a
, "c", len
) == 0)
1496 * pflags
|= lang_flag
;
1499 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1503 else if (lang_flag
!= 0)
1504 * pflags
|= lang_flag
;
1507 "warning: unrecognized argument to --help= option: %.*s\n",
1516 print_specific_help (include_flags
, exclude_flags
, 0);
1517 exit_after_options
= true;
1522 print_version (stderr
, "");
1523 exit_after_options
= true;
1527 g_switch_value
= value
;
1528 g_switch_set
= true;
1533 /* Currently handled in a prescan. */
1537 /* For backward compatibility, -W is the same as -Wextra. */
1542 enable_warning_as_error (arg
, value
, lang_mask
);
1549 case OPT_Wlarger_than_
:
1550 /* This form corresponds to -Wlarger-than-.
1551 Kept for backward compatibility.
1552 Don't use it as the first argument of warning(). */
1554 case OPT_Wlarger_than_eq
:
1555 larger_than_size
= value
;
1556 warn_larger_than
= value
!= -1;
1559 case OPT_Wframe_larger_than_
:
1560 frame_larger_than_size
= value
;
1561 warn_frame_larger_than
= value
!= -1;
1564 case OPT_Wstrict_aliasing
:
1565 set_Wstrict_aliasing (value
);
1568 case OPT_Wstrict_aliasing_
:
1569 warn_strict_aliasing
= value
;
1572 case OPT_Wstrict_overflow
:
1573 warn_strict_overflow
= (value
1574 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1578 case OPT_Wstrict_overflow_
:
1579 warn_strict_overflow
= value
;
1583 set_Wunused (value
);
1588 aux_info_file_name
= arg
;
1589 flag_gen_aux_info
= 1;
1593 aux_base_name
= arg
;
1596 case OPT_auxbase_strip
:
1598 char *tmp
= xstrdup (arg
);
1599 strip_off_ending (tmp
, strlen (tmp
));
1601 aux_base_name
= tmp
;
1606 decode_d_option (arg
);
1610 dump_base_name
= arg
;
1613 case OPT_falign_functions_
:
1614 align_functions
= value
;
1617 case OPT_falign_jumps_
:
1618 align_jumps
= value
;
1621 case OPT_falign_labels_
:
1622 align_labels
= value
;
1625 case OPT_falign_loops_
:
1626 align_loops
= value
;
1629 case OPT_fbranch_probabilities
:
1630 flag_branch_probabilities_set
= true;
1633 case OPT_fcall_used_
:
1634 fix_register (arg
, 0, 1);
1637 case OPT_fcall_saved_
:
1638 fix_register (arg
, 0, 0);
1642 dbg_cnt_process_opt (arg
);
1645 case OPT_fdbg_cnt_list
:
1646 dbg_cnt_list_all_counters ();
1649 case OPT_fdebug_prefix_map_
:
1650 add_debug_prefix_map (arg
);
1653 case OPT_fdiagnostics_show_location_
:
1654 if (!strcmp (arg
, "once"))
1655 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1656 else if (!strcmp (arg
, "every-line"))
1657 diagnostic_prefixing_rule (global_dc
)
1658 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1663 case OPT_fdiagnostics_show_option
:
1664 global_dc
->show_option_requested
= true;
1668 if (!dump_switch_p (arg
))
1672 case OPT_ffast_math
:
1673 set_fast_math_flags (value
);
1676 case OPT_funsafe_math_optimizations
:
1677 set_unsafe_math_optimizations_flags (value
);
1681 fix_register (arg
, 1, 1);
1684 case OPT_finline_limit_
:
1685 case OPT_finline_limit_eq
:
1686 set_param_value ("max-inline-insns-single", value
/ 2);
1687 set_param_value ("max-inline-insns-auto", value
/ 2);
1690 case OPT_finstrument_functions_exclude_function_list_
:
1691 add_instrument_functions_exclude_list
1692 (&flag_instrument_functions_exclude_functions
, arg
);
1695 case OPT_finstrument_functions_exclude_file_list_
:
1696 add_instrument_functions_exclude_list
1697 (&flag_instrument_functions_exclude_files
, arg
);
1700 case OPT_fmessage_length_
:
1701 pp_set_line_maximum_length (global_dc
->printer
, value
);
1704 case OPT_fpack_struct_
:
1705 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1706 error ("structure alignment must be a small power of two, not %d", value
);
1709 initial_max_fld_align
= value
;
1710 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1714 case OPT_fpeel_loops
:
1715 flag_peel_loops_set
= true;
1718 case OPT_fprofile_arcs
:
1719 profile_arc_flag_set
= true;
1722 case OPT_finline_functions
:
1723 flag_inline_functions_set
= true;
1726 case OPT_fprofile_dir_
:
1727 profile_data_prefix
= xstrdup (arg
);
1730 case OPT_fprofile_use_
:
1731 profile_data_prefix
= xstrdup (arg
);
1732 flag_profile_use
= true;
1734 /* No break here - do -fprofile-use processing. */
1735 case OPT_fprofile_use
:
1736 if (!flag_branch_probabilities_set
)
1737 flag_branch_probabilities
= value
;
1738 if (!flag_profile_values_set
)
1739 flag_profile_values
= value
;
1740 if (!flag_unroll_loops_set
)
1741 flag_unroll_loops
= value
;
1742 if (!flag_peel_loops_set
)
1743 flag_peel_loops
= value
;
1744 if (!flag_tracer_set
)
1745 flag_tracer
= value
;
1746 if (!flag_value_profile_transformations_set
)
1747 flag_value_profile_transformations
= value
;
1748 if (!flag_inline_functions_set
)
1749 flag_inline_functions
= value
;
1752 case OPT_fprofile_generate_
:
1753 profile_data_prefix
= xstrdup (arg
);
1755 /* No break here - do -fprofile-generate processing. */
1756 case OPT_fprofile_generate
:
1757 if (!profile_arc_flag_set
)
1758 profile_arc_flag
= value
;
1759 if (!flag_profile_values_set
)
1760 flag_profile_values
= value
;
1761 if (!flag_value_profile_transformations_set
)
1762 flag_value_profile_transformations
= value
;
1763 if (!flag_inline_functions_set
)
1764 flag_inline_functions
= value
;
1767 case OPT_fprofile_values
:
1768 flag_profile_values_set
= true;
1771 case OPT_fvisibility_
:
1773 if (!strcmp(arg
, "default"))
1774 default_visibility
= VISIBILITY_DEFAULT
;
1775 else if (!strcmp(arg
, "internal"))
1776 default_visibility
= VISIBILITY_INTERNAL
;
1777 else if (!strcmp(arg
, "hidden"))
1778 default_visibility
= VISIBILITY_HIDDEN
;
1779 else if (!strcmp(arg
, "protected"))
1780 default_visibility
= VISIBILITY_PROTECTED
;
1782 error ("unrecognized visibility value \"%s\"", arg
);
1787 flag_value_profile_transformations_set
= true;
1790 case OPT_frandom_seed
:
1791 /* The real switch is -fno-random-seed. */
1794 set_random_seed (NULL
);
1797 case OPT_frandom_seed_
:
1798 set_random_seed (arg
);
1801 case OPT_fsched_verbose_
:
1802 #ifdef INSN_SCHEDULING
1803 fix_sched_param ("verbose", arg
);
1809 case OPT_fsched_stalled_insns_
:
1810 flag_sched_stalled_insns
= value
;
1811 if (flag_sched_stalled_insns
== 0)
1812 flag_sched_stalled_insns
= -1;
1815 case OPT_fsched_stalled_insns_dep_
:
1816 flag_sched_stalled_insns_dep
= value
;
1819 case OPT_fstack_limit
:
1820 /* The real switch is -fno-stack-limit. */
1823 stack_limit_rtx
= NULL_RTX
;
1826 case OPT_fstack_limit_register_
:
1828 int reg
= decode_reg_name (arg
);
1830 error ("unrecognized register name \"%s\"", arg
);
1832 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1836 case OPT_fstack_limit_symbol_
:
1837 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1840 case OPT_ftree_vectorizer_verbose_
:
1841 vect_set_verbosity_level (arg
);
1844 case OPT_ftls_model_
:
1845 if (!strcmp (arg
, "global-dynamic"))
1846 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1847 else if (!strcmp (arg
, "local-dynamic"))
1848 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1849 else if (!strcmp (arg
, "initial-exec"))
1850 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1851 else if (!strcmp (arg
, "local-exec"))
1852 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1854 warning (0, "unknown tls-model \"%s\"", arg
);
1857 case OPT_fira_algorithm_
:
1858 if (!strcmp (arg
, "regional"))
1859 flag_ira_algorithm
= IRA_ALGORITHM_REGIONAL
;
1860 else if (!strcmp (arg
, "CB"))
1861 flag_ira_algorithm
= IRA_ALGORITHM_CB
;
1862 else if (!strcmp (arg
, "mixed"))
1863 flag_ira_algorithm
= IRA_ALGORITHM_MIXED
;
1865 warning (0, "unknown ira algorithm \"%s\"", arg
);
1868 case OPT_fira_verbose_
:
1869 flag_ira_verbose
= value
;
1873 flag_tracer_set
= true;
1876 case OPT_funroll_loops
:
1877 flag_unroll_loops_set
= true;
1881 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1885 set_debug_level (SDB_DEBUG
, false, arg
);
1889 set_debug_level (DWARF2_DEBUG
, false, arg
);
1893 set_debug_level (NO_DEBUG
, 2, arg
);
1898 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1902 set_debug_level (VMS_DEBUG
, false, arg
);
1907 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1911 asm_file_name
= arg
;
1914 case OPT_pedantic_errors
:
1915 flag_pedantic_errors
= pedantic
= 1;
1918 case OPT_floop_optimize
:
1919 case OPT_frerun_loop_opt
:
1920 case OPT_fstrength_reduce
:
1921 case OPT_ftree_store_copy_prop
:
1922 case OPT_fforce_addr
:
1923 case OPT_ftree_salias
:
1924 /* These are no-ops, preserved for backward compatibility. */
1928 /* If the flag was handled in a standard way, assume the lack of
1929 processing here is intentional. */
1930 gcc_assert (cl_options
[scode
].flag_var
);
1937 /* Handle --param NAME=VALUE. */
1939 handle_param (const char *carg
)
1944 arg
= xstrdup (carg
);
1945 equal
= strchr (arg
, '=');
1947 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1950 value
= integral_argument (equal
+ 1);
1952 error ("invalid --param value %qs", equal
+ 1);
1956 set_param_value (arg
, value
);
1963 /* Handle -W and -Wextra. */
1965 set_Wextra (int setting
)
1967 extra_warnings
= setting
;
1968 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1970 /* We save the value of warn_uninitialized, since if they put
1971 -Wuninitialized on the command line, we need to generate a
1972 warning about not using it without also specifying -O. */
1974 warn_uninitialized
= 0;
1975 else if (warn_uninitialized
!= 1)
1976 warn_uninitialized
= 2;
1979 /* Initialize unused warning flags. */
1981 set_Wunused (int setting
)
1983 warn_unused_function
= setting
;
1984 warn_unused_label
= setting
;
1985 /* Unused function parameter warnings are reported when either
1986 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1987 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1988 otherwise set maybe_warn_extra_parameter, which will be picked up
1990 maybe_warn_unused_parameter
= setting
;
1991 warn_unused_parameter
= (setting
&& extra_warnings
);
1992 warn_unused_variable
= setting
;
1993 warn_unused_value
= setting
;
1996 /* Used to set the level of strict aliasing warnings,
1997 when no level is specified (i.e., when -Wstrict-aliasing, and not
1998 -Wstrict-aliasing=level was given).
1999 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2000 and 0 otherwise. After calling this function, wstrict_aliasing will be
2001 set to the default value of -Wstrict_aliasing=level, currently 3. */
2003 set_Wstrict_aliasing (int onoff
)
2005 gcc_assert (onoff
== 0 || onoff
== 1);
2007 warn_strict_aliasing
= 3;
2009 warn_strict_aliasing
= 0;
2012 /* The following routines are useful in setting all the flags that
2013 -ffast-math and -fno-fast-math imply. */
2015 set_fast_math_flags (int set
)
2017 flag_unsafe_math_optimizations
= set
;
2018 set_unsafe_math_optimizations_flags (set
);
2019 flag_finite_math_only
= set
;
2020 flag_errno_math
= !set
;
2023 flag_signaling_nans
= 0;
2024 flag_rounding_math
= 0;
2025 flag_cx_limited_range
= 1;
2029 /* When -funsafe-math-optimizations is set the following
2030 flags are set as well. */
2032 set_unsafe_math_optimizations_flags (int set
)
2034 flag_trapping_math
= !set
;
2035 flag_signed_zeros
= !set
;
2036 flag_associative_math
= set
;
2037 flag_reciprocal_math
= set
;
2040 /* Return true iff flags are set as if -ffast-math. */
2042 fast_math_flags_set_p (void)
2044 return (!flag_trapping_math
2045 && flag_unsafe_math_optimizations
2046 && flag_finite_math_only
2047 && !flag_signed_zeros
2048 && !flag_errno_math
);
2051 /* Handle a debug output -g switch. EXTENDED is true or false to support
2052 extended output (2 is special and means "-ggdb" was given). */
2054 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
2056 static bool type_explicit
;
2058 use_gnu_debug_info_extensions
= extended
;
2060 if (type
== NO_DEBUG
)
2062 if (write_symbols
== NO_DEBUG
)
2064 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
2068 #ifdef DWARF2_DEBUGGING_INFO
2069 write_symbols
= DWARF2_DEBUG
;
2070 #elif defined DBX_DEBUGGING_INFO
2071 write_symbols
= DBX_DEBUG
;
2075 if (write_symbols
== NO_DEBUG
)
2076 warning (0, "target system does not support debug output");
2081 /* Does it conflict with an already selected type? */
2082 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
2083 error ("debug format \"%s\" conflicts with prior selection",
2084 debug_type_names
[type
]);
2085 write_symbols
= type
;
2086 type_explicit
= true;
2089 /* A debug flag without a level defaults to level 2. */
2092 if (!debug_info_level
)
2093 debug_info_level
= 2;
2097 debug_info_level
= integral_argument (arg
);
2098 if (debug_info_level
== (unsigned int) -1)
2099 error ("unrecognised debug output level \"%s\"", arg
);
2100 else if (debug_info_level
> 3)
2101 error ("debug output level %s is too high", arg
);
2105 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2106 a simple on-off switch. */
2109 option_enabled (int opt_idx
)
2111 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
2113 if (option
->flag_var
)
2114 switch (option
->var_type
)
2117 return *(int *) option
->flag_var
!= 0;
2120 return *(int *) option
->flag_var
== option
->var_value
;
2122 case CLVC_BIT_CLEAR
:
2123 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
2126 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
2134 /* Fill STATE with the current state of option OPTION. Return true if
2135 there is some state to store. */
2138 get_option_state (int option
, struct cl_option_state
*state
)
2140 if (cl_options
[option
].flag_var
== 0)
2143 switch (cl_options
[option
].var_type
)
2147 state
->data
= cl_options
[option
].flag_var
;
2148 state
->size
= sizeof (int);
2151 case CLVC_BIT_CLEAR
:
2153 state
->ch
= option_enabled (option
);
2154 state
->data
= &state
->ch
;
2159 state
->data
= *(const char **) cl_options
[option
].flag_var
;
2160 if (state
->data
== 0)
2162 state
->size
= strlen (state
->data
) + 1;
2168 /* Enable a warning option as an error. This is used by -Werror= and
2169 also by legacy Werror-implicit-function-declaration. */
2172 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
)
2177 new_option
= XNEWVEC (char, strlen (arg
) + 2);
2178 new_option
[0] = 'W';
2179 strcpy (new_option
+ 1, arg
);
2180 option_index
= find_opt (new_option
, lang_mask
);
2181 if (option_index
== N_OPTS
)
2183 error ("-Werror=%s: No option -%s", arg
, new_option
);
2187 int kind
= value
? DK_ERROR
: DK_WARNING
;
2188 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
2190 /* -Werror=foo implies -Wfoo. */
2191 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
2192 && cl_options
[option_index
].flag_var
2193 && kind
== DK_ERROR
)
2194 *(int *) cl_options
[option_index
].flag_var
= 1;