1 /* Compilation switch flag definitions for GNU CC.
2 Copyright (C) 1987, 88, 94-98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* $FreeBSD: src/contrib/gcc/flags.h,v 1.4.2.1 2002/06/21 22:38:04 obrien Exp $ */
22 /* $DragonFly: src/contrib/gcc/Attic/flags.h,v 1.2 2003/06/17 04:23:59 dillon Exp $ */
24 /* Name of the input .c file being compiled. */
25 extern char *main_input_filename;
29 NO_DEBUG, /* Write no debug info. */
30 DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */
31 SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */
32 DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */
33 DWARF2_DEBUG, /* Write Dwarf v2 debug info (using dwarf2out.c). */
34 XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */
37 /* Specify which kind of debugging info to generate. */
38 extern enum debug_info_type write_symbols;
42 DINFO_LEVEL_NONE, /* Write no debugging info. */
43 DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */
44 DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */
45 DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */
48 /* Specify how much debugging info to generate. */
49 extern enum debug_info_level debug_info_level;
51 /* Nonzero means use GNU-only extensions in the generated symbolic
52 debugging information. */
53 extern int use_gnu_debug_info_extensions;
55 /* Nonzero means do optimizations. -opt. */
59 /* Nonzero means optimize for size. -Os. */
61 extern int optimize_size;
63 /* Nonzero means do stupid register allocation. -noreg.
64 Currently, this is 1 if `optimize' is 0. */
66 extern int obey_regdecls;
68 /* Don't print functions as they are compiled and don't print
69 times taken by the various passes. -quiet. */
71 extern int quiet_flag;
73 /* Don't print warning messages. -w. */
75 extern int inhibit_warnings;
77 /* Do print extra warnings (such as for uninitialized variables). -W. */
79 extern int extra_warnings;
81 /* Nonzero to warn about unused local variables. */
83 extern int warn_unused;
85 /* Nonzero means warn if inline function is too large. */
87 extern int warn_inline;
89 /* Nonzero to warn about variables used before they are initialized. */
91 extern int warn_uninitialized;
93 /* Zero if unknown pragmas are ignored
94 One if the compiler should warn about an unknown pragma not in
95 a system include file.
96 Greater than one if the compiler should warn for all unknown
99 extern int warn_unknown_pragmas;
101 /* Nonzero means warn about all declarations which shadow others. */
103 extern int warn_shadow;
105 /* Warn if a switch on an enum fails to have a case for every enum value. */
107 extern int warn_switch;
109 /* Nonzero means warn about function definitions that default the return type
110 or that use a null return and have a return-type other than void. */
112 extern int warn_return_type;
114 /* Nonzero means warn about pointer casts that increase the required
115 alignment of the target type (and might therefore lead to a crash
116 due to a misaligned access). */
118 extern int warn_cast_align;
120 /* Nonzero means warn that dbx info for template class methods isn't fully
123 extern int warn_template_debugging;
125 /* Nonzero means warn if a frame is larger that N bytes. The value
126 of N is warn_frame_size. */
128 extern int warn_frame_size_flag;
129 extern int warn_frame_size;
131 /* Nonzero means warn if a function call pushes more than N bytes
132 onto the stack. The value of N is warn_arglist_size. */
134 extern int warn_arglist_size_flag;
135 extern int warn_arglist_size;
137 /* Nonzero means warn about any identifiers that match in the first N
138 characters. The value N is in `id_clash_len'. */
140 extern int warn_id_clash;
141 extern unsigned id_clash_len;
143 /* Nonzero means warn about any objects definitions whose size is larger
144 than N bytes. Also want about function definitions whose returned
145 values are larger than N bytes. The value N is in `larger_than_size'. */
147 extern int warn_larger_than;
148 extern unsigned larger_than_size;
150 /* Warn if a function returns an aggregate,
151 since there are often incompatible calling conventions for doing this. */
153 extern int warn_aggregate_return;
155 /* Nonzero means that -Wformat accepts certain non-ANSI formats. */
157 extern int flag_format_extensions;
159 /* Nonzero if generating code to do profiling. */
161 extern int profile_flag;
163 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
165 extern int profile_block_flag;
167 /* Nonzero if generating code to profile program flow graph arcs. */
169 extern int profile_arc_flag;
171 /* Nonzero if generating info for gcov to calculate line test coverage. */
173 extern int flag_test_coverage;
175 /* Nonzero indicates that branch taken probabilities should be calculated. */
177 extern int flag_branch_probabilities;
179 /* Nonzero for -pedantic switch: warn about anything
180 that standard C forbids. */
184 /* Temporarily suppress certain warnings.
185 This is set while reading code from a system header file. */
187 extern int in_system_header;
189 /* Nonzero for -dp: annotate the assembly with a comment describing the
190 pattern and alternative used. */
192 extern int flag_print_asm_name;
194 /* Now the symbols that are set with `-f' switches. */
196 /* Nonzero means `char' should be signed. */
198 extern int flag_signed_char;
200 /* Nonzero means give an enum type only as many bytes as it needs. */
202 extern int flag_short_enums;
204 /* Nonzero for -fcaller-saves: allocate values in regs that need to
205 be saved across function calls, if that produces overall better code.
206 Optional now, so people can test it. */
208 extern int flag_caller_saves;
210 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
212 extern int flag_pcc_struct_return;
214 /* Nonzero for -fforce-mem: load memory value into a register
215 before arithmetic on it. This makes better cse but slower compilation. */
217 extern int flag_force_mem;
219 /* Nonzero for -fforce-addr: load memory address into a register before
220 reference to memory. This makes better cse but slower compilation. */
222 extern int flag_force_addr;
224 /* Nonzero for -fdefer-pop: don't pop args after each function call;
225 instead save them up to pop many calls' args with one insns. */
227 extern int flag_defer_pop;
229 /* Nonzero for -ffloat-store: don't allocate floats and doubles
230 in extended-precision registers. */
232 extern int flag_float_store;
234 /* Nonzero enables strength-reduction in loop.c. */
236 extern int flag_strength_reduce;
238 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
239 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
240 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
243 extern int flag_unroll_loops;
245 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
246 This is generally not a win. */
248 extern int flag_unroll_all_loops;
250 /* Nonzero forces all invariant computations in loops to be moved
253 extern int flag_move_all_movables;
255 /* Nonzero forces all general induction variables in loops to be
258 extern int flag_reduce_all_givs;
260 /* Nonzero for -fcse-follow-jumps:
261 have cse follow jumps to do a more extensive job. */
263 extern int flag_cse_follow_jumps;
265 /* Nonzero for -fcse-skip-blocks:
266 have cse follow a branch around a block. */
268 extern int flag_cse_skip_blocks;
270 /* Nonzero for -fexpensive-optimizations:
271 perform miscellaneous relatively-expensive optimizations. */
272 extern int flag_expensive_optimizations;
274 /* Nonzero for -fwritable-strings:
275 store string constants in data segment and don't uniquize them. */
277 extern int flag_writable_strings;
279 /* Nonzero means don't put addresses of constant functions in registers.
280 Used for compiling the Unix kernel, where strange substitutions are
281 done on the assembly output. */
283 extern int flag_no_function_cse;
285 /* Nonzero for -fomit-frame-pointer:
286 don't make a frame pointer in simple functions that don't require one. */
288 extern int flag_omit_frame_pointer;
290 /* Nonzero to inhibit use of define_optimization peephole opts. */
292 extern int flag_no_peephole;
294 /* Nonzero means all references through pointers are volatile. */
296 extern int flag_volatile;
298 /* Nonzero means treat all global and extern variables as volatile. */
300 extern int flag_volatile_global;
302 /* Nonzero means treat all static variables as volatile. */
304 extern int flag_volatile_static;
306 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
307 operations in the interest of optimization. For example it allows
308 GCC to assume arguments to sqrt are nonnegative numbers, allowing
309 faster code for sqrt to be generated. */
311 extern int flag_fast_math;
313 /* Nonzero means the front end generally wants `errno' maintained by math
314 operations, like built-in SQRT, unless overridden by flag_fast_math. */
316 extern int flag_errno_math;
318 /* 0 means straightforward implementation of complex divide acceptable.
319 1 means wide ranges of inputs must work for complex divide.
320 2 means C9X-like requirements for complex divide (not yet implemented). */
322 extern int flag_complex_divide_method;
324 /* Nonzero means to run loop optimizations twice. */
326 extern int flag_rerun_loop_opt;
328 /* Nonzero means make functions that look like good inline candidates
331 extern int flag_inline_functions;
333 /* Nonzero for -fkeep-inline-functions: even if we make a function
334 go inline everywhere, keep its definition around for debugging
337 extern int flag_keep_inline_functions;
339 /* Nonzero means that functions declared `inline' will be treated
340 as `static'. Prevents generation of zillions of copies of unused
341 static inline functions; instead, `inlines' are written out
342 only when actually used. Used in conjunction with -g. Also
343 does the right thing with #pragma interface. */
345 extern int flag_no_inline;
347 /* Nonzero if we are only using compiler to check syntax errors. */
349 extern int flag_syntax_only;
351 /* Nonzero means we should save auxiliary info into a .X file. */
353 extern int flag_gen_aux_info;
355 /* Nonzero means make the text shared if supported. */
357 extern int flag_shared_data;
359 /* flag_schedule_insns means schedule insns within basic blocks (before
361 flag_schedule_insns_after_reload means schedule insns after
364 extern int flag_schedule_insns;
365 extern int flag_schedule_insns_after_reload;
368 /* The following flags have effect only for scheduling before register
371 flag_schedule_interblock means schedule insns accross basic blocks.
372 flag_schedule_speculative means allow speculative motion of non-load insns.
373 flag_schedule_speculative_load means allow speculative motion of some
375 flag_schedule_speculative_load_dangerous allows speculative motion of more
378 extern int flag_schedule_interblock;
379 extern int flag_schedule_speculative;
380 extern int flag_schedule_speculative_load;
381 extern int flag_schedule_speculative_load_dangerous;
384 /* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple
385 by a cheaper branch, on a count register. */
386 extern int flag_branch_on_count_reg;
389 /* Nonzero means put things in delayed-branch slots if supported. */
391 extern int flag_delayed_branch;
393 /* Nonzero means suppress output of instruction numbers and line number
394 notes in debugging dumps. */
396 extern int flag_dump_unnumbered;
398 /* Nonzero means pretend it is OK to examine bits of target floats,
399 even if that isn't true. The resulting code will have incorrect constants,
400 but the same series of instructions that the native compiler would make. */
402 extern int flag_pretend_float;
404 /* Nonzero means change certain warnings into errors.
405 Usually these are warnings about failure to conform to some standard. */
407 extern int flag_pedantic_errors;
409 /* Nonzero means generate position-independent code.
410 This is not fully implemented yet. */
414 /* Nonzero means generate extra code for exception handling and enable
415 exception handling. */
417 extern int flag_exceptions;
419 /* Nonzero means use the new model for exception handling. Replaces
420 -DNEW_EH_MODEL as a compile option. */
422 extern int flag_new_exceptions;
424 /* Nonzero means don't place uninitialized global data in common storage
427 extern int flag_no_common;
429 /* -finhibit-size-directive inhibits output of .size for ELF.
430 This is used only for compiling crtstuff.c,
431 and it may be extended to other effects
432 needed for crtstuff.c on other systems. */
433 extern int flag_inhibit_size_directive;
435 /* Nonzero means place each function into its own section on those platforms
436 which support arbitrary section names and unlimited numbers of sections. */
438 extern int flag_function_sections;
440 /* ... and similar for data. */
442 extern int flag_data_sections;
444 /* -fverbose-asm causes extra commentary information to be produced in
445 the generated assembly code (to make it more readable). This option
446 is generally only of use to those who actually need to read the
447 generated assembly code (perhaps while debugging the compiler itself).
448 -fno-verbose-asm, the default, causes the extra information
449 to not be added and is useful when comparing two assembler files. */
451 extern int flag_verbose_asm;
453 /* -dA causes debug information to be produced in
454 the generated assembly code (to make it more readable). This option
455 is generally only of use to those who actually need to read the
456 generated assembly code (perhaps while debugging the compiler itself).
457 Currently, this switch is only used by dwarfout.c; however, it is intended
458 to be a catchall for printing debug information in the assembler file. */
460 extern int flag_debug_asm;
462 /* -fgnu-linker specifies use of the GNU linker for initializations.
463 -fno-gnu-linker says that collect will be used. */
464 extern int flag_gnu_linker;
466 /* Tag all structures with __attribute__(packed) */
467 extern int flag_pack_struct;
469 /* This flag is only tested if alias checking is enabled.
470 0 if pointer arguments may alias each other. True in C.
471 1 if pointer arguments may not alias each other but may alias
473 2 if pointer arguments may not alias each other and may not
474 alias global variables. True in Fortran.
475 The value is ignored if flag_alias_check is 0. */
476 extern int flag_argument_noalias;
478 /* Nonzero if we should do (language-dependent) alias analysis.
479 Typically, this analysis will assume that expressions of certain
480 types do not alias expressions of certain other types. Only used
481 if alias analysis (in general) is enabled. */
482 extern int flag_strict_aliasing;
484 /* Emit code to check for stack overflow; also may cause large objects
485 to be allocated dynamically. */
486 extern int flag_stack_check;
488 /* Do the full regmove optimization pass. */
489 extern int flag_regmove;
491 /* Instrument functions with calls at entry and exit, for profiling. */
492 extern int flag_instrument_function_entry_exit;
494 /* Other basic status info about current function. */
496 /* Nonzero means current function must be given a frame pointer.
497 Set in stmt.c if anything is allocated on the stack there.
498 Set in reload1.c if anything is allocated on the stack there. */
500 extern int frame_pointer_needed;
502 /* Set nonzero if jump_optimize finds that control falls through
503 at the end of the function. */
505 extern int can_reach_end;
507 /* Nonzero if function being compiled receives nonlocal gotos
508 from nested functions. */
510 extern int current_function_has_nonlocal_label;
512 /* Nonzero if function being compiled has nonlocal gotos to parent
515 extern int current_function_has_nonlocal_goto;
517 /* Nonzero if this function has a computed goto.
519 It is computed during find_basic_blocks or during stupid life
522 extern int current_function_has_computed_jump;
524 /* Nonzero if GCC must add code to check memory access (used by Checker). */
526 extern int flag_check_memory_usage;
528 /* Nonzero if GCC must prefix function names (used with
529 flag_check_memory_usage). */
531 extern int flag_prefix_function_name;
532 /* Nonzero if the current function is a thunk, so we should try to cut
533 corners where we can. */
534 extern int current_function_is_thunk;
536 /* Value of the -G xx switch, and whether it was passed or not. */
537 extern int g_switch_value;
538 extern int g_switch_set;
540 /* Value of the -finline-limit flag. */
542 extern int inline_max_insns;
544 /* Nonzero if we dump in VCG format, not plain text. */
545 extern int dump_for_graph;
547 /* Selection of the graph form. */
548 enum graph_dump_types
553 extern enum graph_dump_types graph_dump_format;
555 /* Nonzero means ignore `#ident' directives. 0 means handle them.
556 On SVR4 targets, it also controls whether or not to emit a
557 string identifying the compiler. */
559 extern int flag_no_ident;