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f7a29665 | 1 | /* Compilation switch flag definitions for GNU CC. |
bf1c5332 | 2 | Copyright (C) 1987, 88, 94, 95, 96, 1997 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 | ||
56 | /* Nonzero means do stupid register allocation. -noreg. | |
57 | Currently, this is 1 if `optimize' is 0. */ | |
58 | ||
59 | extern int obey_regdecls; | |
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 | /* Don't print warning messages. -w. */ | |
67 | ||
68 | extern int inhibit_warnings; | |
69 | ||
70 | /* Do print extra warnings (such as for uninitialized variables). -W. */ | |
71 | ||
72 | extern int extra_warnings; | |
73 | ||
74 | /* Nonzero to warn about unused local variables. */ | |
75 | ||
76 | extern int warn_unused; | |
77 | ||
67729b99 BK |
78 | /* Nonzero means warn if inline function is too large. */ |
79 | ||
80 | extern int warn_inline; | |
81 | ||
f7a29665 RS |
82 | /* Nonzero to warn about variables used before they are initialized. */ |
83 | ||
84 | extern int warn_uninitialized; | |
85 | ||
d300e551 NC |
86 | /* Zero if unknown pragmas are ignored |
87 | One if the compiler should warn about an unknown pragma not in | |
88 | a system include file. | |
89 | Greater than one if the compiler should warn for all unknown | |
90 | pragmas. */ | |
91 | ||
92 | extern int warn_unknown_pragmas; | |
93 | ||
f7a29665 RS |
94 | /* Nonzero means warn about all declarations which shadow others. */ |
95 | ||
96 | extern int warn_shadow; | |
97 | ||
98 | /* Warn if a switch on an enum fails to have a case for every enum value. */ | |
99 | ||
100 | extern int warn_switch; | |
101 | ||
102 | /* Nonzero means warn about function definitions that default the return type | |
103 | or that use a null return and have a return-type other than void. */ | |
104 | ||
105 | extern int warn_return_type; | |
106 | ||
107 | /* Nonzero means warn about pointer casts that increase the required | |
108 | alignment of the target type (and might therefore lead to a crash | |
109 | due to a misaligned access). */ | |
110 | ||
111 | extern int warn_cast_align; | |
112 | ||
eaff4f5a BK |
113 | /* Nonzero means warn that dbx info for template class methods isn't fully |
114 | supported yet. */ | |
115 | ||
116 | extern int warn_template_debugging; | |
117 | ||
f7a29665 RS |
118 | /* Nonzero means warn about any identifiers that match in the first N |
119 | characters. The value N is in `id_clash_len'. */ | |
120 | ||
121 | extern int warn_id_clash; | |
76817b9d RK |
122 | extern unsigned id_clash_len; |
123 | ||
124 | /* Nonzero means warn about any objects definitions whose size is larger | |
125 | than N bytes. Also want about function definitions whose returned | |
126 | values are larger than N bytes. The value N is in `larger_than_size'. */ | |
127 | ||
128 | extern int warn_larger_than; | |
129 | extern unsigned larger_than_size; | |
f7a29665 RS |
130 | |
131 | /* Warn if a function returns an aggregate, | |
132 | since there are often incompatible calling conventions for doing this. */ | |
133 | ||
134 | extern int warn_aggregate_return; | |
135 | ||
136 | /* Nonzero if generating code to do profiling. */ | |
137 | ||
138 | extern int profile_flag; | |
139 | ||
140 | /* Nonzero if generating code to do profiling on the basis of basic blocks. */ | |
141 | ||
142 | extern int profile_block_flag; | |
143 | ||
a7dbb8b4 DE |
144 | /* Nonzero if generating code to profile program flow graph arcs. */ |
145 | ||
146 | extern int profile_arc_flag; | |
147 | ||
148 | /* Nonzero if generating info for gcov to calculate line test coverage. */ | |
149 | ||
150 | extern int flag_test_coverage; | |
151 | ||
152 | /* Nonzero indicates that branch taken probabilities should be calculated. */ | |
153 | ||
154 | extern int flag_branch_probabilities; | |
155 | ||
f7a29665 RS |
156 | /* Nonzero for -pedantic switch: warn about anything |
157 | that standard C forbids. */ | |
158 | ||
159 | extern int pedantic; | |
160 | ||
161 | /* Temporarily suppress certain warnings. | |
162 | This is set while reading code from a system header file. */ | |
163 | ||
164 | extern int in_system_header; | |
165 | ||
166 | /* Nonzero for -dp: annotate the assembly with a comment describing the | |
167 | pattern and alternative used. */ | |
168 | ||
169 | extern int flag_print_asm_name; | |
170 | \f | |
171 | /* Now the symbols that are set with `-f' switches. */ | |
172 | ||
173 | /* Nonzero means `char' should be signed. */ | |
174 | ||
175 | extern int flag_signed_char; | |
176 | ||
177 | /* Nonzero means give an enum type only as many bytes as it needs. */ | |
178 | ||
179 | extern int flag_short_enums; | |
180 | ||
181 | /* Nonzero for -fcaller-saves: allocate values in regs that need to | |
182 | be saved across function calls, if that produces overall better code. | |
183 | Optional now, so people can test it. */ | |
184 | ||
185 | extern int flag_caller_saves; | |
186 | ||
187 | /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ | |
188 | ||
189 | extern int flag_pcc_struct_return; | |
190 | ||
191 | /* Nonzero for -fforce-mem: load memory value into a register | |
192 | before arithmetic on it. This makes better cse but slower compilation. */ | |
193 | ||
194 | extern int flag_force_mem; | |
195 | ||
196 | /* Nonzero for -fforce-addr: load memory address into a register before | |
197 | reference to memory. This makes better cse but slower compilation. */ | |
198 | ||
199 | extern int flag_force_addr; | |
200 | ||
201 | /* Nonzero for -fdefer-pop: don't pop args after each function call; | |
202 | instead save them up to pop many calls' args with one insns. */ | |
203 | ||
204 | extern int flag_defer_pop; | |
205 | ||
206 | /* Nonzero for -ffloat-store: don't allocate floats and doubles | |
207 | in extended-precision registers. */ | |
208 | ||
209 | extern int flag_float_store; | |
210 | ||
211 | /* Nonzero enables strength-reduction in loop.c. */ | |
212 | ||
213 | extern int flag_strength_reduce; | |
214 | ||
215 | /* Nonzero enables loop unrolling in unroll.c. Only loops for which the | |
216 | number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, | |
217 | UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are | |
218 | unrolled. */ | |
219 | ||
220 | extern int flag_unroll_loops; | |
221 | ||
222 | /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. | |
223 | This is generally not a win. */ | |
224 | ||
225 | extern int flag_unroll_all_loops; | |
226 | ||
e5eb27e5 JL |
227 | /* Nonzero forces all invariant computations in loops to be moved |
228 | outside the loop. */ | |
229 | ||
230 | extern int flag_move_all_movables; | |
231 | ||
232 | /* Nonzero forces all general induction variables in loops to be | |
233 | strength reduced. */ | |
234 | ||
235 | extern int flag_reduce_all_givs; | |
236 | ||
f7a29665 RS |
237 | /* Nonzero for -fcse-follow-jumps: |
238 | have cse follow jumps to do a more extensive job. */ | |
239 | ||
240 | extern int flag_cse_follow_jumps; | |
241 | ||
8b3686ed RK |
242 | /* Nonzero for -fcse-skip-blocks: |
243 | have cse follow a branch around a block. */ | |
244 | ||
245 | extern int flag_cse_skip_blocks; | |
246 | ||
f7a29665 RS |
247 | /* Nonzero for -fexpensive-optimizations: |
248 | perform miscellaneous relatively-expensive optimizations. */ | |
249 | extern int flag_expensive_optimizations; | |
250 | ||
251 | /* Nonzero for -fwritable-strings: | |
252 | store string constants in data segment and don't uniquize them. */ | |
253 | ||
254 | extern int flag_writable_strings; | |
255 | ||
256 | /* Nonzero means don't put addresses of constant functions in registers. | |
257 | Used for compiling the Unix kernel, where strange substitutions are | |
258 | done on the assembly output. */ | |
259 | ||
260 | extern int flag_no_function_cse; | |
261 | ||
262 | /* Nonzero for -fomit-frame-pointer: | |
263 | don't make a frame pointer in simple functions that don't require one. */ | |
264 | ||
265 | extern int flag_omit_frame_pointer; | |
266 | ||
267 | /* Nonzero to inhibit use of define_optimization peephole opts. */ | |
268 | ||
269 | extern int flag_no_peephole; | |
270 | ||
271 | /* Nonzero means all references through pointers are volatile. */ | |
272 | ||
273 | extern int flag_volatile; | |
274 | ||
68f09448 RS |
275 | /* Nonzero means treat all global and extern variables as global. */ |
276 | ||
277 | extern int flag_volatile_global; | |
278 | ||
8b3686ed RK |
279 | /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math |
280 | operations in the interest of optimization. For example it allows | |
281 | GCC to assume arguments to sqrt are nonnegative numbers, allowing | |
282 | faster code for sqrt to be generated. */ | |
283 | ||
284 | extern int flag_fast_math; | |
285 | ||
64fde701 JW |
286 | /* Nonzero means to run loop optimizations twice. */ |
287 | ||
288 | extern int flag_rerun_loop_opt; | |
289 | ||
f7a29665 RS |
290 | /* Nonzero means make functions that look like good inline candidates |
291 | go inline. */ | |
292 | ||
293 | extern int flag_inline_functions; | |
294 | ||
295 | /* Nonzero for -fkeep-inline-functions: even if we make a function | |
8008b228 | 296 | go inline everywhere, keep its definition around for debugging |
f7a29665 RS |
297 | purposes. */ |
298 | ||
299 | extern int flag_keep_inline_functions; | |
300 | ||
301 | /* Nonzero means that functions declared `inline' will be treated | |
302 | as `static'. Prevents generation of zillions of copies of unused | |
303 | static inline functions; instead, `inlines' are written out | |
304 | only when actually used. Used in conjunction with -g. Also | |
305 | does the right thing with #pragma interface. */ | |
306 | ||
307 | extern int flag_no_inline; | |
308 | ||
309 | /* Nonzero if we are only using compiler to check syntax errors. */ | |
310 | ||
311 | extern int flag_syntax_only; | |
312 | ||
d45cf215 | 313 | /* Nonzero means we should save auxiliary info into a .X file. */ |
f7a29665 RS |
314 | |
315 | extern int flag_gen_aux_info; | |
316 | ||
317 | /* Nonzero means make the text shared if supported. */ | |
318 | ||
319 | extern int flag_shared_data; | |
320 | ||
321 | /* flag_schedule_insns means schedule insns within basic blocks (before | |
322 | local_alloc). | |
323 | flag_schedule_insns_after_reload means schedule insns after | |
324 | global_alloc. */ | |
325 | ||
326 | extern int flag_schedule_insns; | |
327 | extern int flag_schedule_insns_after_reload; | |
328 | ||
8c660648 JL |
329 | #ifdef HAIFA |
330 | /* The following flags have effect only for scheduling before register | |
331 | allocation: | |
332 | ||
333 | flag_schedule_interblock means schedule insns accross basic blocks. | |
334 | flag_schedule_speculative means allow speculative motion of non-load insns. | |
335 | flag_schedule_speculative_load means allow speculative motion of some | |
336 | load insns. | |
337 | flag_schedule_speculative_load_dangerous allows speculative motion of more | |
338 | load insns. | |
339 | flag_schedule_reverse_before_reload means try to reverse original order | |
340 | of insns (S). | |
341 | flag_schedule_reverse_after_reload means try to reverse original order | |
342 | of insns (R). */ | |
343 | ||
344 | extern int flag_schedule_interblock; | |
345 | extern int flag_schedule_speculative; | |
346 | extern int flag_schedule_speculative_load; | |
347 | extern int flag_schedule_speculative_load_dangerous; | |
348 | extern int flag_schedule_reverse_before_reload; | |
349 | extern int flag_schedule_reverse_after_reload; | |
350 | ||
351 | /* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple | |
352 | by a cheaper branch, on a count register. */ | |
353 | extern int flag_branch_on_count_reg; | |
354 | #endif /* HAIFA */ | |
355 | ||
356 | ||
f7a29665 RS |
357 | /* Nonzero means put things in delayed-branch slots if supported. */ |
358 | ||
359 | extern int flag_delayed_branch; | |
360 | ||
361 | /* Nonzero means pretend it is OK to examine bits of target floats, | |
362 | even if that isn't true. The resulting code will have incorrect constants, | |
363 | but the same series of instructions that the native compiler would make. */ | |
364 | ||
365 | extern int flag_pretend_float; | |
366 | ||
367 | /* Nonzero means change certain warnings into errors. | |
368 | Usually these are warnings about failure to conform to some standard. */ | |
369 | ||
370 | extern int flag_pedantic_errors; | |
371 | ||
372 | /* Nonzero means generate position-independent code. | |
373 | This is not fully implemented yet. */ | |
374 | ||
375 | extern int flag_pic; | |
376 | ||
0f41302f MS |
377 | /* Nonzero means generate extra code for exception handling and enable |
378 | exception handling. */ | |
379 | ||
380 | extern int flag_exceptions; | |
381 | ||
2786cbad JM |
382 | /* Nonzero means don't place uninitialized global data in common storage |
383 | by default. */ | |
f7a29665 RS |
384 | |
385 | extern int flag_no_common; | |
386 | ||
387 | /* -finhibit-size-directive inhibits output of .size for ELF. | |
388 | This is used only for compiling crtstuff.c, | |
389 | and it may be extended to other effects | |
390 | needed for crtstuff.c on other systems. */ | |
391 | extern int flag_inhibit_size_directive; | |
392 | ||
cf440348 JL |
393 | /* Nonzero means place each function into its own section on those platforms |
394 | which support arbitrary section names and unlimited numbers of sections. */ | |
395 | ||
396 | extern int flag_function_sections; | |
397 | ||
9a631e8e RS |
398 | /* -fverbose-asm causes extra commentary information to be produced in |
399 | the generated assembly code (to make it more readable). This option | |
400 | is generally only of use to those who actually need to read the | |
32b592fb | 401 | generated assembly code (perhaps while debugging the compiler itself). |
c85f7c16 | 402 | -fno-verbose-asm, the default, causes the extra information |
32b592fb | 403 | to not be added and is useful when comparing two assembler files. */ |
9a631e8e RS |
404 | |
405 | extern int flag_verbose_asm; | |
406 | ||
32b592fb DE |
407 | /* -dA causes debug information to be produced in |
408 | the generated assembly code (to make it more readable). This option | |
409 | is generally only of use to those who actually need to read the | |
410 | generated assembly code (perhaps while debugging the compiler itself). | |
411 | Currently, this switch is only used by dwarfout.c; however, it is intended | |
412 | to be a catchall for printing debug information in the assembler file. */ | |
413 | ||
414 | extern int flag_debug_asm; | |
415 | ||
f7a29665 RS |
416 | /* -fgnu-linker specifies use of the GNU linker for initializations. |
417 | -fno-gnu-linker says that collect will be used. */ | |
418 | extern int flag_gnu_linker; | |
566cdc73 MM |
419 | |
420 | /* Tag all structures with __attribute__(packed) */ | |
421 | extern int flag_pack_struct; | |
bf1c5332 | 422 | |
9ae8ffe7 JL |
423 | /* This flag is only tested if alias checking is enabled. |
424 | 0 if pointer arguments may alias each other. True in C. | |
425 | 1 if pointer arguments may not alias each other but may alias | |
426 | global variables. | |
427 | 2 if pointer arguments may not alias each other and may not | |
428 | alias global variables. True in Fortran. | |
429 | The value is ignored if flag_alias_check is 0. */ | |
430 | extern int flag_argument_noalias; | |
431 | ||
bf1c5332 RK |
432 | /* Emit code to check for stack overflow; also may cause large objects |
433 | to be allocated dynamically. */ | |
434 | extern int flag_stack_check; | |
f7a29665 RS |
435 | \f |
436 | /* Other basic status info about current function. */ | |
437 | ||
438 | /* Nonzero means current function must be given a frame pointer. | |
439 | Set in stmt.c if anything is allocated on the stack there. | |
440 | Set in reload1.c if anything is allocated on the stack there. */ | |
441 | ||
442 | extern int frame_pointer_needed; | |
443 | ||
444 | /* Set nonzero if jump_optimize finds that control falls through | |
445 | at the end of the function. */ | |
446 | ||
447 | extern int can_reach_end; | |
448 | ||
449 | /* Nonzero if function being compiled receives nonlocal gotos | |
450 | from nested functions. */ | |
451 | ||
452 | extern int current_function_has_nonlocal_label; | |
453 | ||
a996f770 JW |
454 | /* Nonzero if function being compiled has nonlocal gotos to parent |
455 | function. */ | |
456 | ||
457 | extern int current_function_has_nonlocal_goto; | |
173cd503 | 458 | |
151b783b RK |
459 | /* Nonzero if GCC must add code to check memory access (used by Checker). */ |
460 | ||
461 | extern int flag_check_memory_usage; | |
462 | ||
463 | /* Nonzero if GCC must prefix function names (used with | |
464 | flag_check_memory_usage). */ | |
465 | ||
466 | extern int flag_prefix_function_name; | |
173cd503 JM |
467 | /* Nonzero if the current function is a thunk, so we should try to cut |
468 | corners where we can. */ | |
f009b725 | 469 | extern int current_function_is_thunk; |