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f7a29665 | 1 | /* Compilation switch flag definitions for GNU CC. |
32b592fb | 2 | Copyright (C) 1987, 1988, 1994, 1995, 1996 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 RS |
29 | DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */ |
30 | XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */ | |
f7a29665 RS |
31 | }; |
32 | ||
33 | /* Specify which kind of debugging info to generate. */ | |
34 | extern enum debug_info_type write_symbols; | |
35 | ||
36 | enum debug_info_level | |
37 | { | |
38 | DINFO_LEVEL_NONE, /* Write no debugging info. */ | |
39 | DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */ | |
40 | DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */ | |
41 | DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */ | |
42 | }; | |
43 | ||
44 | /* Specify how much debugging info to generate. */ | |
45 | extern enum debug_info_level debug_info_level; | |
46 | ||
79604d8f CH |
47 | /* Nonzero means use GNU-only extensions in the generated symbolic |
48 | debugging information. */ | |
49 | extern int use_gnu_debug_info_extensions; | |
f7a29665 RS |
50 | |
51 | /* Nonzero means do optimizations. -opt. */ | |
52 | ||
53 | extern int optimize; | |
54 | ||
55 | /* Nonzero means do stupid register allocation. -noreg. | |
56 | Currently, this is 1 if `optimize' is 0. */ | |
57 | ||
58 | extern int obey_regdecls; | |
59 | ||
60 | /* Don't print functions as they are compiled and don't print | |
61 | times taken by the various passes. -quiet. */ | |
62 | ||
63 | extern int quiet_flag; | |
64 | ||
65 | /* Don't print warning messages. -w. */ | |
66 | ||
67 | extern int inhibit_warnings; | |
68 | ||
69 | /* Do print extra warnings (such as for uninitialized variables). -W. */ | |
70 | ||
71 | extern int extra_warnings; | |
72 | ||
73 | /* Nonzero to warn about unused local variables. */ | |
74 | ||
75 | extern int warn_unused; | |
76 | ||
67729b99 BK |
77 | /* Nonzero means warn if inline function is too large. */ |
78 | ||
79 | extern int warn_inline; | |
80 | ||
f7a29665 RS |
81 | /* Nonzero to warn about variables used before they are initialized. */ |
82 | ||
83 | extern int warn_uninitialized; | |
84 | ||
85 | /* Nonzero means warn about all declarations which shadow others. */ | |
86 | ||
87 | extern int warn_shadow; | |
88 | ||
89 | /* Warn if a switch on an enum fails to have a case for every enum value. */ | |
90 | ||
91 | extern int warn_switch; | |
92 | ||
93 | /* Nonzero means warn about function definitions that default the return type | |
94 | or that use a null return and have a return-type other than void. */ | |
95 | ||
96 | extern int warn_return_type; | |
97 | ||
98 | /* Nonzero means warn about pointer casts that increase the required | |
99 | alignment of the target type (and might therefore lead to a crash | |
100 | due to a misaligned access). */ | |
101 | ||
102 | extern int warn_cast_align; | |
103 | ||
eaff4f5a BK |
104 | /* Nonzero means warn that dbx info for template class methods isn't fully |
105 | supported yet. */ | |
106 | ||
107 | extern int warn_template_debugging; | |
108 | ||
f7a29665 RS |
109 | /* Nonzero means warn about any identifiers that match in the first N |
110 | characters. The value N is in `id_clash_len'. */ | |
111 | ||
112 | extern int warn_id_clash; | |
76817b9d RK |
113 | extern unsigned id_clash_len; |
114 | ||
115 | /* Nonzero means warn about any objects definitions whose size is larger | |
116 | than N bytes. Also want about function definitions whose returned | |
117 | values are larger than N bytes. The value N is in `larger_than_size'. */ | |
118 | ||
119 | extern int warn_larger_than; | |
120 | extern unsigned larger_than_size; | |
f7a29665 RS |
121 | |
122 | /* Warn if a function returns an aggregate, | |
123 | since there are often incompatible calling conventions for doing this. */ | |
124 | ||
125 | extern int warn_aggregate_return; | |
126 | ||
127 | /* Nonzero if generating code to do profiling. */ | |
128 | ||
129 | extern int profile_flag; | |
130 | ||
131 | /* Nonzero if generating code to do profiling on the basis of basic blocks. */ | |
132 | ||
133 | extern int profile_block_flag; | |
134 | ||
135 | /* Nonzero for -pedantic switch: warn about anything | |
136 | that standard C forbids. */ | |
137 | ||
138 | extern int pedantic; | |
139 | ||
140 | /* Temporarily suppress certain warnings. | |
141 | This is set while reading code from a system header file. */ | |
142 | ||
143 | extern int in_system_header; | |
144 | ||
145 | /* Nonzero for -dp: annotate the assembly with a comment describing the | |
146 | pattern and alternative used. */ | |
147 | ||
148 | extern int flag_print_asm_name; | |
149 | \f | |
150 | /* Now the symbols that are set with `-f' switches. */ | |
151 | ||
152 | /* Nonzero means `char' should be signed. */ | |
153 | ||
154 | extern int flag_signed_char; | |
155 | ||
156 | /* Nonzero means give an enum type only as many bytes as it needs. */ | |
157 | ||
158 | extern int flag_short_enums; | |
159 | ||
160 | /* Nonzero for -fcaller-saves: allocate values in regs that need to | |
161 | be saved across function calls, if that produces overall better code. | |
162 | Optional now, so people can test it. */ | |
163 | ||
164 | extern int flag_caller_saves; | |
165 | ||
166 | /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ | |
167 | ||
168 | extern int flag_pcc_struct_return; | |
169 | ||
170 | /* Nonzero for -fforce-mem: load memory value into a register | |
171 | before arithmetic on it. This makes better cse but slower compilation. */ | |
172 | ||
173 | extern int flag_force_mem; | |
174 | ||
175 | /* Nonzero for -fforce-addr: load memory address into a register before | |
176 | reference to memory. This makes better cse but slower compilation. */ | |
177 | ||
178 | extern int flag_force_addr; | |
179 | ||
180 | /* Nonzero for -fdefer-pop: don't pop args after each function call; | |
181 | instead save them up to pop many calls' args with one insns. */ | |
182 | ||
183 | extern int flag_defer_pop; | |
184 | ||
185 | /* Nonzero for -ffloat-store: don't allocate floats and doubles | |
186 | in extended-precision registers. */ | |
187 | ||
188 | extern int flag_float_store; | |
189 | ||
190 | /* Nonzero enables strength-reduction in loop.c. */ | |
191 | ||
192 | extern int flag_strength_reduce; | |
193 | ||
194 | /* Nonzero enables loop unrolling in unroll.c. Only loops for which the | |
195 | number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, | |
196 | UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are | |
197 | unrolled. */ | |
198 | ||
199 | extern int flag_unroll_loops; | |
200 | ||
201 | /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. | |
202 | This is generally not a win. */ | |
203 | ||
204 | extern int flag_unroll_all_loops; | |
205 | ||
206 | /* Nonzero for -fcse-follow-jumps: | |
207 | have cse follow jumps to do a more extensive job. */ | |
208 | ||
209 | extern int flag_cse_follow_jumps; | |
210 | ||
8b3686ed RK |
211 | /* Nonzero for -fcse-skip-blocks: |
212 | have cse follow a branch around a block. */ | |
213 | ||
214 | extern int flag_cse_skip_blocks; | |
215 | ||
f7a29665 RS |
216 | /* Nonzero for -fexpensive-optimizations: |
217 | perform miscellaneous relatively-expensive optimizations. */ | |
218 | extern int flag_expensive_optimizations; | |
219 | ||
220 | /* Nonzero for -fwritable-strings: | |
221 | store string constants in data segment and don't uniquize them. */ | |
222 | ||
223 | extern int flag_writable_strings; | |
224 | ||
225 | /* Nonzero means don't put addresses of constant functions in registers. | |
226 | Used for compiling the Unix kernel, where strange substitutions are | |
227 | done on the assembly output. */ | |
228 | ||
229 | extern int flag_no_function_cse; | |
230 | ||
231 | /* Nonzero for -fomit-frame-pointer: | |
232 | don't make a frame pointer in simple functions that don't require one. */ | |
233 | ||
234 | extern int flag_omit_frame_pointer; | |
235 | ||
236 | /* Nonzero to inhibit use of define_optimization peephole opts. */ | |
237 | ||
238 | extern int flag_no_peephole; | |
239 | ||
240 | /* Nonzero means all references through pointers are volatile. */ | |
241 | ||
242 | extern int flag_volatile; | |
243 | ||
68f09448 RS |
244 | /* Nonzero means treat all global and extern variables as global. */ |
245 | ||
246 | extern int flag_volatile_global; | |
247 | ||
8b3686ed RK |
248 | /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math |
249 | operations in the interest of optimization. For example it allows | |
250 | GCC to assume arguments to sqrt are nonnegative numbers, allowing | |
251 | faster code for sqrt to be generated. */ | |
252 | ||
253 | extern int flag_fast_math; | |
254 | ||
f7a29665 RS |
255 | /* Nonzero means make functions that look like good inline candidates |
256 | go inline. */ | |
257 | ||
258 | extern int flag_inline_functions; | |
259 | ||
260 | /* Nonzero for -fkeep-inline-functions: even if we make a function | |
8008b228 | 261 | go inline everywhere, keep its definition around for debugging |
f7a29665 RS |
262 | purposes. */ |
263 | ||
264 | extern int flag_keep_inline_functions; | |
265 | ||
266 | /* Nonzero means that functions declared `inline' will be treated | |
267 | as `static'. Prevents generation of zillions of copies of unused | |
268 | static inline functions; instead, `inlines' are written out | |
269 | only when actually used. Used in conjunction with -g. Also | |
270 | does the right thing with #pragma interface. */ | |
271 | ||
272 | extern int flag_no_inline; | |
273 | ||
274 | /* Nonzero if we are only using compiler to check syntax errors. */ | |
275 | ||
276 | extern int flag_syntax_only; | |
277 | ||
d45cf215 | 278 | /* Nonzero means we should save auxiliary info into a .X file. */ |
f7a29665 RS |
279 | |
280 | extern int flag_gen_aux_info; | |
281 | ||
282 | /* Nonzero means make the text shared if supported. */ | |
283 | ||
284 | extern int flag_shared_data; | |
285 | ||
286 | /* flag_schedule_insns means schedule insns within basic blocks (before | |
287 | local_alloc). | |
288 | flag_schedule_insns_after_reload means schedule insns after | |
289 | global_alloc. */ | |
290 | ||
291 | extern int flag_schedule_insns; | |
292 | extern int flag_schedule_insns_after_reload; | |
293 | ||
294 | /* Nonzero means put things in delayed-branch slots if supported. */ | |
295 | ||
296 | extern int flag_delayed_branch; | |
297 | ||
5dab5552 MS |
298 | /* Nonzero means to run cleanups after CALL_EXPRs. */ |
299 | ||
300 | extern int flag_short_temps; | |
301 | ||
f7a29665 RS |
302 | /* Nonzero means pretend it is OK to examine bits of target floats, |
303 | even if that isn't true. The resulting code will have incorrect constants, | |
304 | but the same series of instructions that the native compiler would make. */ | |
305 | ||
306 | extern int flag_pretend_float; | |
307 | ||
308 | /* Nonzero means change certain warnings into errors. | |
309 | Usually these are warnings about failure to conform to some standard. */ | |
310 | ||
311 | extern int flag_pedantic_errors; | |
312 | ||
313 | /* Nonzero means generate position-independent code. | |
314 | This is not fully implemented yet. */ | |
315 | ||
316 | extern int flag_pic; | |
317 | ||
0f41302f MS |
318 | /* Nonzero means generate extra code for exception handling and enable |
319 | exception handling. */ | |
320 | ||
321 | extern int flag_exceptions; | |
322 | ||
2786cbad JM |
323 | /* Nonzero means don't place uninitialized global data in common storage |
324 | by default. */ | |
f7a29665 RS |
325 | |
326 | extern int flag_no_common; | |
327 | ||
328 | /* -finhibit-size-directive inhibits output of .size for ELF. | |
329 | This is used only for compiling crtstuff.c, | |
330 | and it may be extended to other effects | |
331 | needed for crtstuff.c on other systems. */ | |
332 | extern int flag_inhibit_size_directive; | |
333 | ||
cf440348 JL |
334 | /* Nonzero means place each function into its own section on those platforms |
335 | which support arbitrary section names and unlimited numbers of sections. */ | |
336 | ||
337 | extern int flag_function_sections; | |
338 | ||
9a631e8e RS |
339 | /* -fverbose-asm causes extra commentary information to be produced in |
340 | the generated assembly code (to make it more readable). This option | |
341 | is generally only of use to those who actually need to read the | |
32b592fb DE |
342 | generated assembly code (perhaps while debugging the compiler itself). |
343 | -fverbose-asm is the default. -fno-verbose-asm causes the extra information | |
344 | to not be added and is useful when comparing two assembler files. */ | |
9a631e8e RS |
345 | |
346 | extern int flag_verbose_asm; | |
347 | ||
32b592fb DE |
348 | /* -dA causes debug information to be produced in |
349 | the generated assembly code (to make it more readable). This option | |
350 | is generally only of use to those who actually need to read the | |
351 | generated assembly code (perhaps while debugging the compiler itself). | |
352 | Currently, this switch is only used by dwarfout.c; however, it is intended | |
353 | to be a catchall for printing debug information in the assembler file. */ | |
354 | ||
355 | extern int flag_debug_asm; | |
356 | ||
f7a29665 RS |
357 | /* -fgnu-linker specifies use of the GNU linker for initializations. |
358 | -fno-gnu-linker says that collect will be used. */ | |
359 | extern int flag_gnu_linker; | |
566cdc73 MM |
360 | |
361 | /* Tag all structures with __attribute__(packed) */ | |
362 | extern int flag_pack_struct; | |
f7a29665 RS |
363 | \f |
364 | /* Other basic status info about current function. */ | |
365 | ||
366 | /* Nonzero means current function must be given a frame pointer. | |
367 | Set in stmt.c if anything is allocated on the stack there. | |
368 | Set in reload1.c if anything is allocated on the stack there. */ | |
369 | ||
370 | extern int frame_pointer_needed; | |
371 | ||
372 | /* Set nonzero if jump_optimize finds that control falls through | |
373 | at the end of the function. */ | |
374 | ||
375 | extern int can_reach_end; | |
376 | ||
377 | /* Nonzero if function being compiled receives nonlocal gotos | |
378 | from nested functions. */ | |
379 | ||
380 | extern int current_function_has_nonlocal_label; | |
381 | ||
a996f770 JW |
382 | /* Nonzero if function being compiled has nonlocal gotos to parent |
383 | function. */ | |
384 | ||
385 | extern int current_function_has_nonlocal_goto; |