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f7a29665 | 1 | /* Compilation switch flag definitions for GNU CC. |
be163a70 | 2 | Copyright (C) 1987, 88, 94-98, 1999 Free Software Foundation, Inc. |
f7a29665 RS |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
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) | |
9 | any later version. | |
10 | ||
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. | |
15 | ||
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 | |
a35311b0 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
f7a29665 RS |
20 | |
21 | /* Name of the input .c file being compiled. */ | |
22 | extern char *main_input_filename; | |
23 | ||
24 | enum debug_info_type | |
25 | { | |
26 | NO_DEBUG, /* Write no debug info. */ | |
27 | DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */ | |
28 | SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */ | |
d45cf215 | 29 | DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */ |
9a666dda | 30 | DWARF2_DEBUG, /* Write Dwarf v2 debug info (using dwarf2out.c). */ |
d45cf215 | 31 | XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */ |
f7a29665 RS |
32 | }; |
33 | ||
34 | /* Specify which kind of debugging info to generate. */ | |
35 | extern enum debug_info_type write_symbols; | |
36 | ||
37 | enum debug_info_level | |
38 | { | |
39 | DINFO_LEVEL_NONE, /* Write no debugging info. */ | |
40 | DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */ | |
41 | DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */ | |
42 | DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */ | |
43 | }; | |
44 | ||
45 | /* Specify how much debugging info to generate. */ | |
46 | extern enum debug_info_level debug_info_level; | |
47 | ||
79604d8f CH |
48 | /* Nonzero means use GNU-only extensions in the generated symbolic |
49 | debugging information. */ | |
50 | extern int use_gnu_debug_info_extensions; | |
f7a29665 RS |
51 | |
52 | /* Nonzero means do optimizations. -opt. */ | |
53 | ||
54 | extern int optimize; | |
55 | ||
c6aded7c AG |
56 | /* Nonzero means optimize for size. -Os. */ |
57 | ||
58 | extern int optimize_size; | |
59 | ||
f7a29665 RS |
60 | /* Nonzero means do stupid register allocation. -noreg. |
61 | Currently, this is 1 if `optimize' is 0. */ | |
62 | ||
63 | extern int obey_regdecls; | |
64 | ||
65 | /* Don't print functions as they are compiled and don't print | |
66 | times taken by the various passes. -quiet. */ | |
67 | ||
68 | extern int quiet_flag; | |
69 | ||
70 | /* Don't print warning messages. -w. */ | |
71 | ||
72 | extern int inhibit_warnings; | |
73 | ||
74 | /* Do print extra warnings (such as for uninitialized variables). -W. */ | |
75 | ||
76 | extern int extra_warnings; | |
77 | ||
78 | /* Nonzero to warn about unused local variables. */ | |
79 | ||
80 | extern int warn_unused; | |
81 | ||
312f6255 GK |
82 | /* Nonzero to warn about code which is never reached. */ |
83 | ||
84 | extern int warn_notreached; | |
85 | ||
67729b99 BK |
86 | /* Nonzero means warn if inline function is too large. */ |
87 | ||
88 | extern int warn_inline; | |
89 | ||
f7a29665 RS |
90 | /* Nonzero to warn about variables used before they are initialized. */ |
91 | ||
92 | extern int warn_uninitialized; | |
93 | ||
d300e551 NC |
94 | /* Zero if unknown pragmas are ignored |
95 | One if the compiler should warn about an unknown pragma not in | |
96 | a system include file. | |
97 | Greater than one if the compiler should warn for all unknown | |
98 | pragmas. */ | |
99 | ||
100 | extern int warn_unknown_pragmas; | |
101 | ||
f7a29665 RS |
102 | /* Nonzero means warn about all declarations which shadow others. */ |
103 | ||
104 | extern int warn_shadow; | |
105 | ||
106 | /* Warn if a switch on an enum fails to have a case for every enum value. */ | |
107 | ||
108 | extern int warn_switch; | |
109 | ||
110 | /* Nonzero means warn about function definitions that default the return type | |
111 | or that use a null return and have a return-type other than void. */ | |
112 | ||
113 | extern int warn_return_type; | |
114 | ||
115 | /* Nonzero means warn about pointer casts that increase the required | |
116 | alignment of the target type (and might therefore lead to a crash | |
117 | due to a misaligned access). */ | |
118 | ||
119 | extern int warn_cast_align; | |
120 | ||
eaff4f5a BK |
121 | /* Nonzero means warn that dbx info for template class methods isn't fully |
122 | supported yet. */ | |
123 | ||
124 | extern int warn_template_debugging; | |
125 | ||
f7a29665 RS |
126 | /* Nonzero means warn about any identifiers that match in the first N |
127 | characters. The value N is in `id_clash_len'. */ | |
128 | ||
129 | extern int warn_id_clash; | |
76817b9d RK |
130 | extern unsigned id_clash_len; |
131 | ||
132 | /* Nonzero means warn about any objects definitions whose size is larger | |
133 | than N bytes. Also want about function definitions whose returned | |
134 | values are larger than N bytes. The value N is in `larger_than_size'. */ | |
135 | ||
136 | extern int warn_larger_than; | |
137 | extern unsigned larger_than_size; | |
f7a29665 RS |
138 | |
139 | /* Warn if a function returns an aggregate, | |
140 | since there are often incompatible calling conventions for doing this. */ | |
141 | ||
142 | extern int warn_aggregate_return; | |
143 | ||
144 | /* Nonzero if generating code to do profiling. */ | |
145 | ||
146 | extern int profile_flag; | |
147 | ||
148 | /* Nonzero if generating code to do profiling on the basis of basic blocks. */ | |
149 | ||
150 | extern int profile_block_flag; | |
151 | ||
a7dbb8b4 DE |
152 | /* Nonzero if generating code to profile program flow graph arcs. */ |
153 | ||
154 | extern int profile_arc_flag; | |
155 | ||
156 | /* Nonzero if generating info for gcov to calculate line test coverage. */ | |
157 | ||
158 | extern int flag_test_coverage; | |
159 | ||
160 | /* Nonzero indicates that branch taken probabilities should be calculated. */ | |
161 | ||
162 | extern int flag_branch_probabilities; | |
163 | ||
f7a29665 RS |
164 | /* Nonzero for -pedantic switch: warn about anything |
165 | that standard C forbids. */ | |
166 | ||
167 | extern int pedantic; | |
168 | ||
169 | /* Temporarily suppress certain warnings. | |
170 | This is set while reading code from a system header file. */ | |
171 | ||
172 | extern int in_system_header; | |
173 | ||
174 | /* Nonzero for -dp: annotate the assembly with a comment describing the | |
175 | pattern and alternative used. */ | |
176 | ||
177 | extern int flag_print_asm_name; | |
178 | \f | |
179 | /* Now the symbols that are set with `-f' switches. */ | |
180 | ||
181 | /* Nonzero means `char' should be signed. */ | |
182 | ||
183 | extern int flag_signed_char; | |
184 | ||
185 | /* Nonzero means give an enum type only as many bytes as it needs. */ | |
186 | ||
187 | extern int flag_short_enums; | |
188 | ||
189 | /* Nonzero for -fcaller-saves: allocate values in regs that need to | |
190 | be saved across function calls, if that produces overall better code. | |
191 | Optional now, so people can test it. */ | |
192 | ||
193 | extern int flag_caller_saves; | |
194 | ||
195 | /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ | |
196 | ||
197 | extern int flag_pcc_struct_return; | |
198 | ||
199 | /* Nonzero for -fforce-mem: load memory value into a register | |
200 | before arithmetic on it. This makes better cse but slower compilation. */ | |
201 | ||
202 | extern int flag_force_mem; | |
203 | ||
204 | /* Nonzero for -fforce-addr: load memory address into a register before | |
205 | reference to memory. This makes better cse but slower compilation. */ | |
206 | ||
207 | extern int flag_force_addr; | |
208 | ||
209 | /* Nonzero for -fdefer-pop: don't pop args after each function call; | |
210 | instead save them up to pop many calls' args with one insns. */ | |
211 | ||
212 | extern int flag_defer_pop; | |
213 | ||
214 | /* Nonzero for -ffloat-store: don't allocate floats and doubles | |
215 | in extended-precision registers. */ | |
216 | ||
217 | extern int flag_float_store; | |
218 | ||
219 | /* Nonzero enables strength-reduction in loop.c. */ | |
220 | ||
221 | extern int flag_strength_reduce; | |
222 | ||
223 | /* Nonzero enables loop unrolling in unroll.c. Only loops for which the | |
224 | number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, | |
225 | UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are | |
226 | unrolled. */ | |
227 | ||
228 | extern int flag_unroll_loops; | |
229 | ||
230 | /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. | |
231 | This is generally not a win. */ | |
232 | ||
233 | extern int flag_unroll_all_loops; | |
234 | ||
e5eb27e5 JL |
235 | /* Nonzero forces all invariant computations in loops to be moved |
236 | outside the loop. */ | |
237 | ||
238 | extern int flag_move_all_movables; | |
239 | ||
240 | /* Nonzero forces all general induction variables in loops to be | |
241 | strength reduced. */ | |
242 | ||
243 | extern int flag_reduce_all_givs; | |
244 | ||
f7a29665 RS |
245 | /* Nonzero for -fcse-follow-jumps: |
246 | have cse follow jumps to do a more extensive job. */ | |
247 | ||
248 | extern int flag_cse_follow_jumps; | |
249 | ||
8b3686ed RK |
250 | /* Nonzero for -fcse-skip-blocks: |
251 | have cse follow a branch around a block. */ | |
252 | ||
253 | extern int flag_cse_skip_blocks; | |
254 | ||
f7a29665 RS |
255 | /* Nonzero for -fexpensive-optimizations: |
256 | perform miscellaneous relatively-expensive optimizations. */ | |
257 | extern int flag_expensive_optimizations; | |
258 | ||
259 | /* Nonzero for -fwritable-strings: | |
260 | store string constants in data segment and don't uniquize them. */ | |
261 | ||
262 | extern int flag_writable_strings; | |
263 | ||
264 | /* Nonzero means don't put addresses of constant functions in registers. | |
265 | Used for compiling the Unix kernel, where strange substitutions are | |
266 | done on the assembly output. */ | |
267 | ||
268 | extern int flag_no_function_cse; | |
269 | ||
270 | /* Nonzero for -fomit-frame-pointer: | |
271 | don't make a frame pointer in simple functions that don't require one. */ | |
272 | ||
273 | extern int flag_omit_frame_pointer; | |
274 | ||
275 | /* Nonzero to inhibit use of define_optimization peephole opts. */ | |
276 | ||
277 | extern int flag_no_peephole; | |
278 | ||
279 | /* Nonzero means all references through pointers are volatile. */ | |
280 | ||
281 | extern int flag_volatile; | |
282 | ||
ab87f8c8 | 283 | /* Nonzero means treat all global and extern variables as volatile. */ |
68f09448 RS |
284 | |
285 | extern int flag_volatile_global; | |
286 | ||
ab87f8c8 JL |
287 | /* Nonzero means treat all static variables as volatile. */ |
288 | ||
289 | extern int flag_volatile_static; | |
290 | ||
8b3686ed RK |
291 | /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math |
292 | operations in the interest of optimization. For example it allows | |
293 | GCC to assume arguments to sqrt are nonnegative numbers, allowing | |
294 | faster code for sqrt to be generated. */ | |
295 | ||
296 | extern int flag_fast_math; | |
297 | ||
41af162c CB |
298 | /* Nonzero means the front end generally wants `errno' maintained by math |
299 | operations, like built-in SQRT, unless overridden by flag_fast_math. */ | |
300 | ||
301 | extern int flag_errno_math; | |
302 | ||
c64f913e CB |
303 | /* 0 means straightforward implementation of complex divide acceptable. |
304 | 1 means wide ranges of inputs must work for complex divide. | |
305 | 2 means C9X-like requirements for complex divide (not yet implemented). */ | |
306 | ||
307 | extern int flag_complex_divide_method; | |
308 | ||
64fde701 JW |
309 | /* Nonzero means to run loop optimizations twice. */ |
310 | ||
311 | extern int flag_rerun_loop_opt; | |
312 | ||
f7a29665 RS |
313 | /* Nonzero means make functions that look like good inline candidates |
314 | go inline. */ | |
315 | ||
316 | extern int flag_inline_functions; | |
317 | ||
318 | /* Nonzero for -fkeep-inline-functions: even if we make a function | |
8008b228 | 319 | go inline everywhere, keep its definition around for debugging |
f7a29665 RS |
320 | purposes. */ |
321 | ||
322 | extern int flag_keep_inline_functions; | |
323 | ||
324 | /* Nonzero means that functions declared `inline' will be treated | |
325 | as `static'. Prevents generation of zillions of copies of unused | |
326 | static inline functions; instead, `inlines' are written out | |
327 | only when actually used. Used in conjunction with -g. Also | |
328 | does the right thing with #pragma interface. */ | |
329 | ||
330 | extern int flag_no_inline; | |
331 | ||
332 | /* Nonzero if we are only using compiler to check syntax errors. */ | |
333 | ||
334 | extern int flag_syntax_only; | |
335 | ||
d45cf215 | 336 | /* Nonzero means we should save auxiliary info into a .X file. */ |
f7a29665 RS |
337 | |
338 | extern int flag_gen_aux_info; | |
339 | ||
340 | /* Nonzero means make the text shared if supported. */ | |
341 | ||
342 | extern int flag_shared_data; | |
343 | ||
344 | /* flag_schedule_insns means schedule insns within basic blocks (before | |
345 | local_alloc). | |
346 | flag_schedule_insns_after_reload means schedule insns after | |
347 | global_alloc. */ | |
348 | ||
349 | extern int flag_schedule_insns; | |
350 | extern int flag_schedule_insns_after_reload; | |
351 | ||
8c660648 JL |
352 | /* The following flags have effect only for scheduling before register |
353 | allocation: | |
354 | ||
355 | flag_schedule_interblock means schedule insns accross basic blocks. | |
356 | flag_schedule_speculative means allow speculative motion of non-load insns. | |
357 | flag_schedule_speculative_load means allow speculative motion of some | |
358 | load insns. | |
359 | flag_schedule_speculative_load_dangerous allows speculative motion of more | |
8e7336f8 | 360 | load insns. */ |
8c660648 JL |
361 | |
362 | extern int flag_schedule_interblock; | |
363 | extern int flag_schedule_speculative; | |
364 | extern int flag_schedule_speculative_load; | |
365 | extern int flag_schedule_speculative_load_dangerous; | |
8c660648 JL |
366 | |
367 | /* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple | |
368 | by a cheaper branch, on a count register. */ | |
369 | extern int flag_branch_on_count_reg; | |
8c660648 JL |
370 | |
371 | ||
f7a29665 RS |
372 | /* Nonzero means put things in delayed-branch slots if supported. */ |
373 | ||
374 | extern int flag_delayed_branch; | |
375 | ||
b707b450 R |
376 | /* Nonzero means suppress output of instruction numbers and line number |
377 | notes in debugging dumps. */ | |
378 | ||
379 | extern int flag_dump_unnumbered; | |
380 | ||
f7a29665 RS |
381 | /* Nonzero means pretend it is OK to examine bits of target floats, |
382 | even if that isn't true. The resulting code will have incorrect constants, | |
383 | but the same series of instructions that the native compiler would make. */ | |
384 | ||
385 | extern int flag_pretend_float; | |
386 | ||
387 | /* Nonzero means change certain warnings into errors. | |
388 | Usually these are warnings about failure to conform to some standard. */ | |
389 | ||
390 | extern int flag_pedantic_errors; | |
391 | ||
392 | /* Nonzero means generate position-independent code. | |
393 | This is not fully implemented yet. */ | |
394 | ||
395 | extern int flag_pic; | |
396 | ||
0f41302f MS |
397 | /* Nonzero means generate extra code for exception handling and enable |
398 | exception handling. */ | |
399 | ||
400 | extern int flag_exceptions; | |
401 | ||
a1622f83 AM |
402 | /* Nonzero means use the new model for exception handling. Replaces |
403 | -DNEW_EH_MODEL as a compile option. */ | |
404 | ||
405 | extern int flag_new_exceptions; | |
406 | ||
2786cbad JM |
407 | /* Nonzero means don't place uninitialized global data in common storage |
408 | by default. */ | |
f7a29665 RS |
409 | |
410 | extern int flag_no_common; | |
411 | ||
412 | /* -finhibit-size-directive inhibits output of .size for ELF. | |
413 | This is used only for compiling crtstuff.c, | |
414 | and it may be extended to other effects | |
415 | needed for crtstuff.c on other systems. */ | |
416 | extern int flag_inhibit_size_directive; | |
417 | ||
cf440348 JL |
418 | /* Nonzero means place each function into its own section on those platforms |
419 | which support arbitrary section names and unlimited numbers of sections. */ | |
420 | ||
421 | extern int flag_function_sections; | |
422 | ||
7d0756fb CM |
423 | /* ... and similar for data. */ |
424 | ||
425 | extern int flag_data_sections; | |
426 | ||
9a631e8e RS |
427 | /* -fverbose-asm causes extra commentary information to be produced in |
428 | the generated assembly code (to make it more readable). This option | |
429 | is generally only of use to those who actually need to read the | |
32b592fb | 430 | generated assembly code (perhaps while debugging the compiler itself). |
c85f7c16 | 431 | -fno-verbose-asm, the default, causes the extra information |
32b592fb | 432 | to not be added and is useful when comparing two assembler files. */ |
9a631e8e RS |
433 | |
434 | extern int flag_verbose_asm; | |
435 | ||
32b592fb DE |
436 | /* -dA causes debug information to be produced in |
437 | the generated assembly code (to make it more readable). This option | |
438 | is generally only of use to those who actually need to read the | |
439 | generated assembly code (perhaps while debugging the compiler itself). | |
440 | Currently, this switch is only used by dwarfout.c; however, it is intended | |
441 | to be a catchall for printing debug information in the assembler file. */ | |
442 | ||
443 | extern int flag_debug_asm; | |
444 | ||
f7a29665 RS |
445 | /* -fgnu-linker specifies use of the GNU linker for initializations. |
446 | -fno-gnu-linker says that collect will be used. */ | |
447 | extern int flag_gnu_linker; | |
566cdc73 MM |
448 | |
449 | /* Tag all structures with __attribute__(packed) */ | |
450 | extern int flag_pack_struct; | |
bf1c5332 | 451 | |
9ae8ffe7 JL |
452 | /* This flag is only tested if alias checking is enabled. |
453 | 0 if pointer arguments may alias each other. True in C. | |
454 | 1 if pointer arguments may not alias each other but may alias | |
455 | global variables. | |
456 | 2 if pointer arguments may not alias each other and may not | |
457 | alias global variables. True in Fortran. | |
458 | The value is ignored if flag_alias_check is 0. */ | |
459 | extern int flag_argument_noalias; | |
460 | ||
41472af8 MM |
461 | /* Nonzero if we should do (language-dependent) alias analysis. |
462 | Typically, this analysis will assume that expressions of certain | |
463 | types do not alias expressions of certain other types. Only used | |
464 | if alias analysis (in general) is enabled. */ | |
465 | extern int flag_strict_aliasing; | |
466 | ||
bf1c5332 RK |
467 | /* Emit code to check for stack overflow; also may cause large objects |
468 | to be allocated dynamically. */ | |
469 | extern int flag_stack_check; | |
1230327b R |
470 | |
471 | /* Do the full regmove optimization pass. */ | |
472 | extern int flag_regmove; | |
07417085 KR |
473 | |
474 | /* Instrument functions with calls at entry and exit, for profiling. */ | |
475 | extern int flag_instrument_function_entry_exit; | |
ede7cd44 RH |
476 | |
477 | /* Perform a peephole pass before sched2. */ | |
478 | extern int flag_peephole2; | |
a8aa7975 GM |
479 | |
480 | /* -fbounded-pointers causes gcc to compile pointers as composite | |
481 | objects occupying three words: the pointer value, the base address | |
482 | of the referent object, and the address immediately beyond the end | |
483 | of the referent object. The base and extent allow us to perform | |
484 | runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */ | |
485 | extern int flag_bounded_pointers; | |
486 | ||
487 | /* -fcheck-bounds causes gcc to generate array bounds checks. | |
488 | For C, C++: defaults to value of flag_bounded_pointers. | |
489 | For ObjC: defaults to off. | |
490 | For Java: defaults to on. | |
491 | For Fortran: defaults to off. | |
492 | For CHILL: defaults to off. */ | |
493 | extern int flag_bounds_check; | |
f7a29665 RS |
494 | \f |
495 | /* Other basic status info about current function. */ | |
496 | ||
497 | /* Nonzero means current function must be given a frame pointer. | |
498 | Set in stmt.c if anything is allocated on the stack there. | |
499 | Set in reload1.c if anything is allocated on the stack there. */ | |
500 | ||
501 | extern int frame_pointer_needed; | |
502 | ||
503 | /* Set nonzero if jump_optimize finds that control falls through | |
504 | at the end of the function. */ | |
505 | ||
506 | extern int can_reach_end; | |
507 | ||
151b783b RK |
508 | /* Nonzero if GCC must add code to check memory access (used by Checker). */ |
509 | ||
510 | extern int flag_check_memory_usage; | |
511 | ||
512 | /* Nonzero if GCC must prefix function names (used with | |
513 | flag_check_memory_usage). */ | |
514 | ||
515 | extern int flag_prefix_function_name; | |
bb8ebb7f RH |
516 | |
517 | /* Value of the -G xx switch, and whether it was passed or not. */ | |
518 | extern int g_switch_value; | |
519 | extern int g_switch_set; | |
735a0e33 | 520 | |
f9e814f1 TP |
521 | /* Value of the -finline-limit flag. */ |
522 | ||
523 | extern int inline_max_insns; | |
524 | ||
efa3896a GK |
525 | /* Values of the -falign-* flags: how much to align labels in code. |
526 | 0 means `use default', 1 means `don't align'. | |
527 | For each variable, there is an _log variant which is the power | |
528 | of two not less than the variable, for .align output. */ | |
529 | ||
530 | extern int align_loops; | |
531 | extern int align_loops_log; | |
532 | extern int align_jumps; | |
533 | extern int align_jumps_log; | |
534 | extern int align_labels; | |
535 | extern int align_labels_log; | |
536 | extern int align_functions; | |
537 | extern int align_functions_log; | |
538 | ||
735a0e33 UD |
539 | /* Nonzero if we dump in VCG format, not plain text. */ |
540 | extern int dump_for_graph; | |
541 | ||
542 | /* Selection of the graph form. */ | |
543 | enum graph_dump_types | |
544 | { | |
545 | no_graph = 0, | |
546 | vcg | |
547 | }; | |
548 | extern enum graph_dump_types graph_dump_format; | |
be163a70 ZW |
549 | |
550 | /* Nonzero means ignore `#ident' directives. 0 means handle them. | |
551 | On SVR4 targets, it also controls whether or not to emit a | |
552 | string identifying the compiler. */ | |
553 | ||
554 | extern int flag_no_ident; |