]>
Commit | Line | Data |
---|---|---|
1 | /* Compilation switch flag definitions for GNU CC. | |
2 | Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | /* Name of the input .c file being compiled. */ | |
23 | extern const char *main_input_filename; | |
24 | ||
25 | enum debug_info_type | |
26 | { | |
27 | NO_DEBUG, /* Write no debug info. */ | |
28 | DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */ | |
29 | SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */ | |
30 | DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */ | |
31 | DWARF2_DEBUG, /* Write Dwarf v2 debug info (using dwarf2out.c). */ | |
32 | XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */ | |
33 | }; | |
34 | ||
35 | /* Specify which kind of debugging info to generate. */ | |
36 | extern enum debug_info_type write_symbols; | |
37 | ||
38 | enum debug_info_level | |
39 | { | |
40 | DINFO_LEVEL_NONE, /* Write no debugging info. */ | |
41 | DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */ | |
42 | DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */ | |
43 | DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */ | |
44 | }; | |
45 | ||
46 | /* Specify how much debugging info to generate. */ | |
47 | extern enum debug_info_level debug_info_level; | |
48 | ||
49 | /* Nonzero means use GNU-only extensions in the generated symbolic | |
50 | debugging information. */ | |
51 | extern int use_gnu_debug_info_extensions; | |
52 | ||
53 | /* Nonzero means do optimizations. -opt. */ | |
54 | ||
55 | extern int optimize; | |
56 | ||
57 | /* Nonzero means optimize for size. -Os. */ | |
58 | ||
59 | extern int optimize_size; | |
60 | ||
61 | /* Don't print functions as they are compiled and don't print | |
62 | times taken by the various passes. -quiet. */ | |
63 | ||
64 | extern int quiet_flag; | |
65 | ||
66 | /* Print times taken by the various passes. -ftime-report. */ | |
67 | ||
68 | extern int time_report; | |
69 | ||
70 | /* Print memory still in use at end of compilation (which may have little | |
71 | to do with peak memory consumption). -fmem-report. */ | |
72 | ||
73 | extern int mem_report; | |
74 | ||
75 | /* Don't print warning messages. -w. */ | |
76 | ||
77 | extern int inhibit_warnings; | |
78 | ||
79 | /* Do print extra warnings (such as for uninitialized variables). -W. */ | |
80 | ||
81 | extern int extra_warnings; | |
82 | ||
83 | /* Nonzero to warn about unused variables, functions et.al. Use | |
84 | set_Wunused() to update the -Wunused-* flags that correspond to the | |
85 | -Wunused option. */ | |
86 | ||
87 | extern void set_Wunused PARAMS ((int setting)); | |
88 | ||
89 | extern int warn_unused_function; | |
90 | extern int warn_unused_label; | |
91 | extern int warn_unused_parameter; | |
92 | extern int warn_unused_variable; | |
93 | extern int warn_unused_value; | |
94 | ||
95 | /* Nonzero to warn about code which is never reached. */ | |
96 | ||
97 | extern int warn_notreached; | |
98 | ||
99 | /* Nonzero means warn if inline function is too large. */ | |
100 | ||
101 | extern int warn_inline; | |
102 | ||
103 | /* Nonzero to warn about variables used before they are initialized. */ | |
104 | ||
105 | extern int warn_uninitialized; | |
106 | ||
107 | /* Zero if unknown pragmas are ignored | |
108 | One if the compiler should warn about an unknown pragma not in | |
109 | a system include file. | |
110 | Greater than one if the compiler should warn for all unknown | |
111 | pragmas. */ | |
112 | ||
113 | extern int warn_unknown_pragmas; | |
114 | ||
115 | /* Nonzero means warn about all declarations which shadow others. */ | |
116 | ||
117 | extern int warn_shadow; | |
118 | ||
119 | /* Warn if a switch on an enum fails to have a case for every enum value. */ | |
120 | ||
121 | extern int warn_switch; | |
122 | ||
123 | /* Nonzero means warn about function definitions that default the return type | |
124 | or that use a null return and have a return-type other than void. */ | |
125 | ||
126 | extern int warn_return_type; | |
127 | ||
128 | /* Nonzero means warn about pointer casts that increase the required | |
129 | alignment of the target type (and might therefore lead to a crash | |
130 | due to a misaligned access). */ | |
131 | ||
132 | extern int warn_cast_align; | |
133 | ||
134 | /* Nonzero means warn about any identifiers that match in the first N | |
135 | characters. The value N is in `id_clash_len'. */ | |
136 | ||
137 | extern int warn_id_clash; | |
138 | extern int id_clash_len; | |
139 | ||
140 | /* Nonzero means warn about any objects definitions whose size is larger | |
141 | than N bytes. Also want about function definitions whose returned | |
142 | values are larger than N bytes. The value N is in `larger_than_size'. */ | |
143 | ||
144 | extern int warn_larger_than; | |
145 | extern HOST_WIDE_INT larger_than_size; | |
146 | ||
147 | /* Warn if a function returns an aggregate, | |
148 | since there are often incompatible calling conventions for doing this. */ | |
149 | ||
150 | extern int warn_aggregate_return; | |
151 | ||
152 | /* Warn if packed attribute on struct is unnecessary and inefficient. */ | |
153 | ||
154 | extern int warn_packed; | |
155 | ||
156 | /* Warn when gcc pads a structure to an alignment boundary. */ | |
157 | ||
158 | extern int warn_padded; | |
159 | ||
160 | /* Nonzero if generating code to do profiling. */ | |
161 | ||
162 | extern int profile_flag; | |
163 | ||
164 | /* Nonzero if generating code to do profiling on the basis of basic blocks. */ | |
165 | ||
166 | extern int profile_block_flag; | |
167 | ||
168 | /* Nonzero if generating code to profile program flow graph arcs. */ | |
169 | ||
170 | extern int profile_arc_flag; | |
171 | ||
172 | /* Nonzero if generating info for gcov to calculate line test coverage. */ | |
173 | ||
174 | extern int flag_test_coverage; | |
175 | ||
176 | /* Nonzero indicates that branch taken probabilities should be calculated. */ | |
177 | ||
178 | extern int flag_branch_probabilities; | |
179 | ||
180 | /* Nonzero for -pedantic switch: warn about anything | |
181 | that standard C forbids. */ | |
182 | ||
183 | extern int pedantic; | |
184 | ||
185 | /* Temporarily suppress certain warnings. | |
186 | This is set while reading code from a system header file. */ | |
187 | ||
188 | extern int in_system_header; | |
189 | ||
190 | /* Nonzero for -dp: annotate the assembly with a comment describing the | |
191 | pattern and alternative used. */ | |
192 | ||
193 | extern int flag_print_asm_name; | |
194 | \f | |
195 | /* Now the symbols that are set with `-f' switches. */ | |
196 | ||
197 | /* Nonzero means `char' should be signed. */ | |
198 | ||
199 | extern int flag_signed_char; | |
200 | ||
201 | /* Nonzero means give an enum type only as many bytes as it needs. */ | |
202 | ||
203 | extern int flag_short_enums; | |
204 | ||
205 | /* Nonzero for -fcaller-saves: allocate values in regs that need to | |
206 | be saved across function calls, if that produces overall better code. | |
207 | Optional now, so people can test it. */ | |
208 | ||
209 | extern int flag_caller_saves; | |
210 | ||
211 | /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ | |
212 | ||
213 | extern int flag_pcc_struct_return; | |
214 | ||
215 | /* Nonzero for -fforce-mem: load memory value into a register | |
216 | before arithmetic on it. This makes better cse but slower compilation. */ | |
217 | ||
218 | extern int flag_force_mem; | |
219 | ||
220 | /* Nonzero for -fforce-addr: load memory address into a register before | |
221 | reference to memory. This makes better cse but slower compilation. */ | |
222 | ||
223 | extern int flag_force_addr; | |
224 | ||
225 | /* Nonzero for -fdefer-pop: don't pop args after each function call; | |
226 | instead save them up to pop many calls' args with one insns. */ | |
227 | ||
228 | extern int flag_defer_pop; | |
229 | ||
230 | /* Nonzero for -ffloat-store: don't allocate floats and doubles | |
231 | in extended-precision registers. */ | |
232 | ||
233 | extern int flag_float_store; | |
234 | ||
235 | /* Nonzero enables strength-reduction in loop.c. */ | |
236 | ||
237 | extern int flag_strength_reduce; | |
238 | ||
239 | /* Nonzero enables loop unrolling in unroll.c. Only loops for which the | |
240 | number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, | |
241 | UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are | |
242 | unrolled. */ | |
243 | ||
244 | extern int flag_unroll_loops; | |
245 | ||
246 | /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. | |
247 | This is generally not a win. */ | |
248 | ||
249 | extern int flag_unroll_all_loops; | |
250 | ||
251 | /* Nonzero forces all invariant computations in loops to be moved | |
252 | outside the loop. */ | |
253 | ||
254 | extern int flag_move_all_movables; | |
255 | ||
256 | /* Nonzero forces all general induction variables in loops to be | |
257 | strength reduced. */ | |
258 | ||
259 | extern int flag_reduce_all_givs; | |
260 | ||
261 | /* Nonzero for -fcse-follow-jumps: | |
262 | have cse follow jumps to do a more extensive job. */ | |
263 | ||
264 | extern int flag_cse_follow_jumps; | |
265 | ||
266 | /* Nonzero for -fcse-skip-blocks: | |
267 | have cse follow a branch around a block. */ | |
268 | ||
269 | extern int flag_cse_skip_blocks; | |
270 | ||
271 | /* Nonzero for -fexpensive-optimizations: | |
272 | perform miscellaneous relatively-expensive optimizations. */ | |
273 | extern int flag_expensive_optimizations; | |
274 | ||
275 | /* Nonzero for -fwritable-strings: | |
276 | store string constants in data segment and don't uniquize them. */ | |
277 | ||
278 | extern int flag_writable_strings; | |
279 | ||
280 | /* Nonzero means don't put addresses of constant functions in registers. | |
281 | Used for compiling the Unix kernel, where strange substitutions are | |
282 | done on the assembly output. */ | |
283 | ||
284 | extern int flag_no_function_cse; | |
285 | ||
286 | /* Nonzero for -fomit-frame-pointer: | |
287 | don't make a frame pointer in simple functions that don't require one. */ | |
288 | ||
289 | extern int flag_omit_frame_pointer; | |
290 | ||
291 | /* Nonzero to inhibit use of define_optimization peephole opts. */ | |
292 | ||
293 | extern int flag_no_peephole; | |
294 | ||
295 | /* Nonzero means all references through pointers are volatile. */ | |
296 | ||
297 | extern int flag_volatile; | |
298 | ||
299 | /* Nonzero means treat all global and extern variables as volatile. */ | |
300 | ||
301 | extern int flag_volatile_global; | |
302 | ||
303 | /* Nonzero means treat all static variables as volatile. */ | |
304 | ||
305 | extern int flag_volatile_static; | |
306 | ||
307 | /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math | |
308 | operations in the interest of optimization. For example it allows | |
309 | GCC to assume arguments to sqrt are nonnegative numbers, allowing | |
310 | faster code for sqrt to be generated. */ | |
311 | ||
312 | extern int flag_fast_math; | |
313 | ||
314 | /* Nonzero allows GCC to optimize sibling and tail recursive calls. */ | |
315 | ||
316 | extern int flag_optimize_sibling_calls; | |
317 | ||
318 | /* Nonzero means the front end generally wants `errno' maintained by math | |
319 | operations, like built-in SQRT, unless overridden by flag_fast_math. */ | |
320 | ||
321 | extern int flag_errno_math; | |
322 | ||
323 | /* 0 means straightforward implementation of complex divide acceptable. | |
324 | 1 means wide ranges of inputs must work for complex divide. | |
325 | 2 means C9X-like requirements for complex divide (not yet implemented). */ | |
326 | ||
327 | extern int flag_complex_divide_method; | |
328 | ||
329 | /* Nonzero means to run loop optimizations twice. */ | |
330 | ||
331 | extern int flag_rerun_loop_opt; | |
332 | ||
333 | /* Nonzero means make functions that look like good inline candidates | |
334 | go inline. */ | |
335 | ||
336 | extern int flag_inline_functions; | |
337 | ||
338 | /* Nonzero for -fkeep-inline-functions: even if we make a function | |
339 | go inline everywhere, keep its definition around for debugging | |
340 | purposes. */ | |
341 | ||
342 | extern int flag_keep_inline_functions; | |
343 | ||
344 | /* Nonzero means that functions declared `inline' will be treated | |
345 | as `static'. Prevents generation of zillions of copies of unused | |
346 | static inline functions; instead, `inlines' are written out | |
347 | only when actually used. Used in conjunction with -g. Also | |
348 | does the right thing with #pragma interface. */ | |
349 | ||
350 | extern int flag_no_inline; | |
351 | ||
352 | /* Nonzero if we are only using compiler to check syntax errors. */ | |
353 | ||
354 | extern int flag_syntax_only; | |
355 | ||
356 | /* Nonzero means we should save auxiliary info into a .X file. */ | |
357 | ||
358 | extern int flag_gen_aux_info; | |
359 | ||
360 | /* Nonzero means make the text shared if supported. */ | |
361 | ||
362 | extern int flag_shared_data; | |
363 | ||
364 | /* flag_schedule_insns means schedule insns within basic blocks (before | |
365 | local_alloc). | |
366 | flag_schedule_insns_after_reload means schedule insns after | |
367 | global_alloc. */ | |
368 | ||
369 | extern int flag_schedule_insns; | |
370 | extern int flag_schedule_insns_after_reload; | |
371 | ||
372 | /* The following flags have effect only for scheduling before register | |
373 | allocation: | |
374 | ||
375 | flag_schedule_interblock means schedule insns accross basic blocks. | |
376 | flag_schedule_speculative means allow speculative motion of non-load insns. | |
377 | flag_schedule_speculative_load means allow speculative motion of some | |
378 | load insns. | |
379 | flag_schedule_speculative_load_dangerous allows speculative motion of more | |
380 | load insns. */ | |
381 | ||
382 | extern int flag_schedule_interblock; | |
383 | extern int flag_schedule_speculative; | |
384 | extern int flag_schedule_speculative_load; | |
385 | extern int flag_schedule_speculative_load_dangerous; | |
386 | ||
387 | /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple | |
388 | by a cheaper branch, on a count register. */ | |
389 | extern int flag_branch_on_count_reg; | |
390 | ||
391 | /* This option is set to 1 on -fsingle-precision-constant option which is | |
392 | used to convert the floating point constants to single precision | |
393 | constants. */ | |
394 | ||
395 | extern int flag_single_precision_constant; | |
396 | ||
397 | /* Nonzero means put things in delayed-branch slots if supported. */ | |
398 | ||
399 | extern int flag_delayed_branch; | |
400 | ||
401 | /* Nonzero means suppress output of instruction numbers and line number | |
402 | notes in debugging dumps. */ | |
403 | ||
404 | extern int flag_dump_unnumbered; | |
405 | ||
406 | /* Nonzero means pretend it is OK to examine bits of target floats, | |
407 | even if that isn't true. The resulting code will have incorrect constants, | |
408 | but the same series of instructions that the native compiler would make. */ | |
409 | ||
410 | extern int flag_pretend_float; | |
411 | ||
412 | /* Nonzero means change certain warnings into errors. | |
413 | Usually these are warnings about failure to conform to some standard. */ | |
414 | ||
415 | extern int flag_pedantic_errors; | |
416 | ||
417 | /* Nonzero means generate position-independent code. | |
418 | This is not fully implemented yet. */ | |
419 | ||
420 | extern int flag_pic; | |
421 | ||
422 | /* Nonzero means generate extra code for exception handling and enable | |
423 | exception handling. */ | |
424 | ||
425 | extern int flag_exceptions; | |
426 | ||
427 | /* Nonzero means use the new model for exception handling. Replaces | |
428 | -DNEW_EH_MODEL as a compile option. */ | |
429 | ||
430 | extern int flag_new_exceptions; | |
431 | ||
432 | /* Nonzero means generate frame unwind info table when supported */ | |
433 | ||
434 | extern int flag_unwind_tables; | |
435 | ||
436 | /* Nonzero means don't place uninitialized global data in common storage | |
437 | by default. */ | |
438 | ||
439 | extern int flag_no_common; | |
440 | ||
441 | /* -finhibit-size-directive inhibits output of .size for ELF. | |
442 | This is used only for compiling crtstuff.c, | |
443 | and it may be extended to other effects | |
444 | needed for crtstuff.c on other systems. */ | |
445 | extern int flag_inhibit_size_directive; | |
446 | ||
447 | /* Nonzero means place each function into its own section on those platforms | |
448 | which support arbitrary section names and unlimited numbers of sections. */ | |
449 | ||
450 | extern int flag_function_sections; | |
451 | ||
452 | /* ... and similar for data. */ | |
453 | ||
454 | extern int flag_data_sections; | |
455 | ||
456 | /* -fverbose-asm causes extra commentary information to be produced in | |
457 | the generated assembly code (to make it more readable). This option | |
458 | is generally only of use to those who actually need to read the | |
459 | generated assembly code (perhaps while debugging the compiler itself). | |
460 | -fno-verbose-asm, the default, causes the extra information | |
461 | to not be added and is useful when comparing two assembler files. */ | |
462 | ||
463 | extern int flag_verbose_asm; | |
464 | ||
465 | /* -dA causes debug information to be produced in | |
466 | the generated assembly code (to make it more readable). This option | |
467 | is generally only of use to those who actually need to read the | |
468 | generated assembly code (perhaps while debugging the compiler itself). | |
469 | Currently, this switch is only used by dwarfout.c; however, it is intended | |
470 | to be a catchall for printing debug information in the assembler file. */ | |
471 | ||
472 | extern int flag_debug_asm; | |
473 | ||
474 | /* -fgnu-linker specifies use of the GNU linker for initializations. | |
475 | -fno-gnu-linker says that collect will be used. */ | |
476 | extern int flag_gnu_linker; | |
477 | ||
478 | /* Tag all structures with __attribute__(packed) */ | |
479 | extern int flag_pack_struct; | |
480 | ||
481 | /* This flag is only tested if alias checking is enabled. | |
482 | 0 if pointer arguments may alias each other. True in C. | |
483 | 1 if pointer arguments may not alias each other but may alias | |
484 | global variables. | |
485 | 2 if pointer arguments may not alias each other and may not | |
486 | alias global variables. True in Fortran. | |
487 | The value is ignored if flag_alias_check is 0. */ | |
488 | extern int flag_argument_noalias; | |
489 | ||
490 | /* Nonzero if we should do (language-dependent) alias analysis. | |
491 | Typically, this analysis will assume that expressions of certain | |
492 | types do not alias expressions of certain other types. Only used | |
493 | if alias analysis (in general) is enabled. */ | |
494 | extern int flag_strict_aliasing; | |
495 | ||
496 | /* Emit code to probe the stack, to help detect stack overflow; also | |
497 | may cause large objects to be allocated dynamically. */ | |
498 | extern int flag_stack_check; | |
499 | ||
500 | /* Do the full regmove optimization pass. */ | |
501 | extern int flag_regmove; | |
502 | ||
503 | /* Instrument functions with calls at entry and exit, for profiling. */ | |
504 | extern int flag_instrument_function_entry_exit; | |
505 | ||
506 | /* Perform a peephole pass before sched2. */ | |
507 | extern int flag_peephole2; | |
508 | ||
509 | /* -fbounded-pointers causes gcc to compile pointers as composite | |
510 | objects occupying three words: the pointer value, the base address | |
511 | of the referent object, and the address immediately beyond the end | |
512 | of the referent object. The base and extent allow us to perform | |
513 | runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */ | |
514 | extern int flag_bounded_pointers; | |
515 | ||
516 | /* -fcheck-bounds causes gcc to generate array bounds checks. | |
517 | For C, C++: defaults to value of flag_bounded_pointers. | |
518 | For ObjC: defaults to off. | |
519 | For Java: defaults to on. | |
520 | For Fortran: defaults to off. | |
521 | For CHILL: defaults to off. */ | |
522 | extern int flag_bounds_check; | |
523 | ||
524 | /* If one, renumber instruction UIDs to reduce the number of | |
525 | unused UIDs if there are a lot of instructions. If greater than | |
526 | one, unconditionally renumber instruction UIDs. */ | |
527 | extern int flag_renumber_insns; | |
528 | \f | |
529 | /* Other basic status info about current function. */ | |
530 | ||
531 | /* Nonzero means current function must be given a frame pointer. | |
532 | Set in stmt.c if anything is allocated on the stack there. | |
533 | Set in reload1.c if anything is allocated on the stack there. */ | |
534 | ||
535 | extern int frame_pointer_needed; | |
536 | ||
537 | /* Set nonzero if jump_optimize finds that control falls through | |
538 | at the end of the function. */ | |
539 | ||
540 | extern int can_reach_end; | |
541 | ||
542 | /* Nonzero if GCC must add code to check memory access (used by Checker). */ | |
543 | ||
544 | extern int flag_check_memory_usage; | |
545 | ||
546 | /* Nonzero if GCC must prefix function names (used with | |
547 | flag_check_memory_usage). */ | |
548 | ||
549 | extern int flag_prefix_function_name; | |
550 | ||
551 | /* Value of the -G xx switch, and whether it was passed or not. */ | |
552 | extern int g_switch_value; | |
553 | extern int g_switch_set; | |
554 | ||
555 | /* Value of the -finline-limit flag. */ | |
556 | ||
557 | extern int inline_max_insns; | |
558 | ||
559 | /* Values of the -falign-* flags: how much to align labels in code. | |
560 | 0 means `use default', 1 means `don't align'. | |
561 | For each variable, there is an _log variant which is the power | |
562 | of two not less than the variable, for .align output. */ | |
563 | ||
564 | extern int align_loops; | |
565 | extern int align_loops_log; | |
566 | extern int align_jumps; | |
567 | extern int align_jumps_log; | |
568 | extern int align_labels; | |
569 | extern int align_labels_log; | |
570 | extern int align_functions; | |
571 | extern int align_functions_log; | |
572 | ||
573 | /* Nonzero if we dump in VCG format, not plain text. */ | |
574 | extern int dump_for_graph; | |
575 | ||
576 | /* Selection of the graph form. */ | |
577 | enum graph_dump_types | |
578 | { | |
579 | no_graph = 0, | |
580 | vcg | |
581 | }; | |
582 | extern enum graph_dump_types graph_dump_format; | |
583 | ||
584 | /* Nonzero means ignore `#ident' directives. 0 means handle them. | |
585 | On SVR4 targets, it also controls whether or not to emit a | |
586 | string identifying the compiler. */ | |
587 | ||
588 | extern int flag_no_ident; | |
589 | ||
590 | /* Nonzero means we should do dwarf2 duplicate elimination. */ | |
591 | ||
592 | extern int flag_eliminate_dwarf2_dups; |