1 /* Compilation switch flag definitions for GCC.
2 Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
3 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
30 NO_DEBUG
, /* Write no debug info. */
31 DBX_DEBUG
, /* Write BSD .stabs for DBX (using dbxout.c). */
32 SDB_DEBUG
, /* Write COFF for (old) SDB (using sdbout.c). */
33 DWARF2_DEBUG
, /* Write Dwarf v2 debug info (using dwarf2out.c). */
34 XCOFF_DEBUG
, /* Write IBM/Xcoff debug info (using dbxout.c). */
35 VMS_DEBUG
, /* Write VMS debug info (using vmsdbgout.c). */
36 VMS_AND_DWARF2_DEBUG
/* Write VMS debug info (using vmsdbgout.c).
37 and DWARF v2 debug info (using dwarf2out.c). */
40 /* Specify which kind of debugging info to generate. */
41 extern enum debug_info_type write_symbols
;
43 /* Names of debug_info_type, for error messages. */
44 extern const char *const debug_type_names
[];
48 DINFO_LEVEL_NONE
, /* Write no debugging info. */
49 DINFO_LEVEL_TERSE
, /* Write minimal info to support tracebacks only. */
50 DINFO_LEVEL_NORMAL
, /* Write info for all declarations (and line table). */
51 DINFO_LEVEL_VERBOSE
/* Write normal info plus #define/#undef info. */
54 /* Specify how much debugging info to generate. */
55 extern enum debug_info_level debug_info_level
;
57 /* Nonzero means use GNU-only extensions in the generated symbolic
58 debugging information. */
59 extern bool use_gnu_debug_info_extensions
;
61 /* Enumerate visibility settings. This is deliberately ordered from most
62 to least visibility. */
63 #ifndef SYMBOL_VISIBILITY_DEFINED
64 #define SYMBOL_VISIBILITY_DEFINED
65 enum symbol_visibility
74 /* The default visibility for all symbols (unless overridden). */
75 extern enum symbol_visibility default_visibility
;
77 struct visibility_flags
79 unsigned inpragma
: 1; /* True when in #pragma GCC visibility. */
80 unsigned inlines_hidden
: 1; /* True when -finlineshidden in effect. */
83 /* Global visibility options. */
84 extern struct visibility_flags visibility_options
;
86 /* Nonzero means do optimizations. -opt. */
90 /* Nonzero means optimize for size. -Os. */
92 extern int optimize_size
;
94 /* Do print extra warnings (such as for uninitialized variables).
97 extern bool extra_warnings
;
99 /* Nonzero to warn about unused variables, functions et.al. Use
100 set_Wunused() to update the -Wunused-* flags that correspond to the
103 extern void set_Wunused (int setting
);
105 /* Nonzero means warn about any objects definitions whose size is larger
106 than N bytes. Also want about function definitions whose returned
107 values are larger than N bytes. The value N is in `larger_than_size'. */
109 extern bool warn_larger_than
;
110 extern HOST_WIDE_INT larger_than_size
;
112 /* Nonzero means warn about constructs which might not be strict
115 extern int warn_strict_aliasing
;
117 /* Nonzero means warn about optimizations which rely on undefined
120 extern int warn_strict_overflow
;
122 /* Temporarily suppress certain warnings.
123 This is set while reading code from a system header file. */
125 extern int in_system_header
;
127 /* Nonzero for -dp: annotate the assembly with a comment describing the
128 pattern and alternative used. */
130 extern int flag_print_asm_name
;
132 /* Now the symbols that are set with `-f' switches. */
134 /* Nonzero means `char' should be signed. */
136 extern int flag_signed_char
;
138 /* Nonzero means give an enum type only as many bytes as it needs. A value
139 of 2 means it has not yet been initialized. */
141 extern int flag_short_enums
;
143 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
145 extern int flag_pcc_struct_return
;
147 /* 0 means straightforward implementation of complex divide acceptable.
148 1 means wide ranges of inputs must work for complex divide.
149 2 means C99-like requirements for complex multiply and divide. */
151 extern int flag_complex_method
;
153 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
154 not just because the tree inliner turned us off. */
156 extern int flag_really_no_inline
;
158 /* Nonzero if we are only using compiler to check syntax errors. */
160 extern int rtl_dump_and_exit
;
162 /* Nonzero means we should save auxiliary info into a .X file. */
164 extern int flag_gen_aux_info
;
166 /* Nonzero means suppress output of instruction numbers and line number
167 notes in debugging dumps. */
169 extern int flag_dump_unnumbered
;
171 /* Nonzero means change certain warnings into errors.
172 Usually these are warnings about failure to conform to some standard. */
174 extern int flag_pedantic_errors
;
176 /* Nonzero if we are compiling code for a shared library, zero for
179 extern int flag_shlib
;
181 /* -dA causes debug information to be produced in
182 the generated assembly code (to make it more readable). This option
183 is generally only of use to those who actually need to read the
184 generated assembly code (perhaps while debugging the compiler itself).
185 Currently, this switch is only used by dwarfout.c; however, it is intended
186 to be a catchall for printing debug information in the assembler file. */
188 extern int flag_debug_asm
;
190 /* Generate code for GNU or NeXT Objective-C runtime environment. */
192 extern int flag_next_runtime
;
194 extern int flag_dump_rtl_in_asm
;
196 /* Other basic status info about current function. */
198 /* Nonzero means current function must be given a frame pointer.
199 Set in stmt.c if anything is allocated on the stack there.
200 Set in reload1.c if anything is allocated on the stack there. */
202 extern int frame_pointer_needed
;
204 /* Nonzero if subexpressions must be evaluated from left-to-right. */
205 extern int flag_evaluation_order
;
207 /* Value of the -G xx switch, and whether it was passed or not. */
208 extern unsigned HOST_WIDE_INT g_switch_value
;
209 extern bool g_switch_set
;
211 /* Values of the -falign-* flags: how much to align labels in code.
212 0 means `use default', 1 means `don't align'.
213 For each variable, there is an _log variant which is the power
214 of two not less than the variable, for .align output. */
216 extern int align_loops_log
;
217 extern int align_loops_max_skip
;
218 extern int align_jumps_log
;
219 extern int align_jumps_max_skip
;
220 extern int align_labels_log
;
221 extern int align_labels_max_skip
;
222 extern int align_functions_log
;
224 /* Like align_functions_log above, but used by front-ends to force the
225 minimum function alignment. Zero means no alignment is forced. */
226 extern int force_align_functions_log
;
228 /* Nonzero if we dump in VCG format, not plain text. */
229 extern int dump_for_graph
;
231 /* Selection of the graph form. */
232 enum graph_dump_types
237 extern enum graph_dump_types graph_dump_format
;
239 /* Nonzero means to collect statistics which might be expensive
240 and to print them when we are done. */
241 extern int flag_detailed_statistics
;
243 /* Nonzero means that we defer emitting functions until they are actually
245 extern int flag_remove_unreachable_functions
;
247 /* Nonzero if we should track variables. */
248 extern int flag_var_tracking
;
250 /* True if flag_speculative_prefetching was set by user. Used to suppress
251 warning message in case flag was set by -fprofile-{generate,use}. */
252 extern bool flag_speculative_prefetching_set
;
254 /* A string that's used when a random name is required. NULL means
255 to make it really random. */
257 extern const char *flag_random_seed
;
259 /* Returns TRUE if generated code should match ABI version N or
260 greater is in use. */
262 #define abi_version_at_least(N) \
263 (flag_abi_version == 0 || flag_abi_version >= (N))
265 /* True if the given mode has a NaN representation and the treatment of
266 NaN operands is important. Certain optimizations, such as folding
267 x * 0 into 0, are not correct for NaN operands, and are normally
268 disabled for modes with NaNs. The user can ask for them to be
269 done anyway using the -funsafe-math-optimizations switch. */
270 #define HONOR_NANS(MODE) \
271 (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
273 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */
274 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
276 /* As for HONOR_NANS, but true if the mode can represent infinity and
277 the treatment of infinite values is important. */
278 #define HONOR_INFINITIES(MODE) \
279 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
281 /* Like HONOR_NANS, but true if the given mode distinguishes between
282 positive and negative zero, and the sign of zero is important. */
283 #define HONOR_SIGNED_ZEROS(MODE) \
284 (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
286 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
287 and the rounding mode is important. */
288 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
289 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
291 /* True if overflow wraps around for the given integral type. That
292 is, TYPE_MAX + 1 == TYPE_MIN. */
293 #define TYPE_OVERFLOW_WRAPS(TYPE) \
294 (TYPE_UNSIGNED (TYPE) || flag_wrapv)
296 /* True if overflow is undefined for the given integral type. We may
297 optimize on the assumption that values in the type never overflow.
299 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
300 must issue a warning based on warn_strict_overflow. In some cases
301 it will be appropriate to issue the warning immediately, and in
302 other cases it will be appropriate to simply set a flag and let the
303 caller decide whether a warning is appropriate or not. */
304 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
305 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
307 /* True if overflow for the given integral type should issue a
309 #define TYPE_OVERFLOW_TRAPS(TYPE) \
310 (!TYPE_UNSIGNED (TYPE) && flag_trapv)
312 /* Names for the different levels of -Wstrict-overflow=N. The numeric
313 values here correspond to N. */
315 enum warn_strict_overflow_code
317 /* Overflow warning that should be issued with -Wall: a questionable
318 construct that is easy to avoid even when using macros. Example:
319 folding (x + CONSTANT > x) to 1. */
320 WARN_STRICT_OVERFLOW_ALL
= 1,
321 /* Overflow warning about folding a comparison to a constant because
322 of undefined signed overflow, other than cases covered by
323 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1
324 (this is false when x == INT_MIN). */
325 WARN_STRICT_OVERFLOW_CONDITIONAL
= 2,
326 /* Overflow warning about changes to comparisons other than folding
327 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */
328 WARN_STRICT_OVERFLOW_COMPARISON
= 3,
329 /* Overflow warnings not covered by the above cases. Example:
330 folding ((x * 10) / 5) to (x * 2). */
331 WARN_STRICT_OVERFLOW_MISC
= 4,
332 /* Overflow warnings about reducing magnitude of constants in
333 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */
334 WARN_STRICT_OVERFLOW_MAGNITUDE
= 5
337 /* Whether to emit an overflow warning whose code is C. */
340 issue_strict_overflow_warning (enum warn_strict_overflow_code c
)
342 return warn_strict_overflow
>= (int) c
;
345 #endif /* ! GCC_FLAGS_H */