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f7a29665 RS |
1 | /* Compilation switch flag definitions for GNU CC. |
2 | Copyright (C) 1987, 1988 Free Software Foundation, Inc. | |
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 | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* Name of the input .c file being compiled. */ | |
21 | extern char *main_input_filename; | |
22 | ||
23 | enum debug_info_type | |
24 | { | |
25 | NO_DEBUG, /* Write no debug info. */ | |
26 | DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */ | |
27 | SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */ | |
d45cf215 RS |
28 | DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */ |
29 | XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */ | |
f7a29665 RS |
30 | }; |
31 | ||
32 | /* Specify which kind of debugging info to generate. */ | |
33 | extern enum debug_info_type write_symbols; | |
34 | ||
35 | enum debug_info_level | |
36 | { | |
37 | DINFO_LEVEL_NONE, /* Write no debugging info. */ | |
38 | DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */ | |
39 | DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */ | |
40 | DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */ | |
41 | }; | |
42 | ||
43 | /* Specify how much debugging info to generate. */ | |
44 | extern enum debug_info_level debug_info_level; | |
45 | ||
d45cf215 | 46 | #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) |
f7a29665 RS |
47 | /* Nonzero means use GDB-only extensions of DBX format. */ |
48 | extern int use_gdb_dbx_extensions; | |
49 | #endif | |
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 | ||
77 | /* Nonzero to warn about variables used before they are initialized. */ | |
78 | ||
79 | extern int warn_uninitialized; | |
80 | ||
81 | /* Nonzero means warn about all declarations which shadow others. */ | |
82 | ||
83 | extern int warn_shadow; | |
84 | ||
85 | /* Warn if a switch on an enum fails to have a case for every enum value. */ | |
86 | ||
87 | extern int warn_switch; | |
88 | ||
89 | /* Nonzero means warn about function definitions that default the return type | |
90 | or that use a null return and have a return-type other than void. */ | |
91 | ||
92 | extern int warn_return_type; | |
93 | ||
94 | /* Nonzero means warn about pointer casts that increase the required | |
95 | alignment of the target type (and might therefore lead to a crash | |
96 | due to a misaligned access). */ | |
97 | ||
98 | extern int warn_cast_align; | |
99 | ||
100 | /* Nonzero means warn about any identifiers that match in the first N | |
101 | characters. The value N is in `id_clash_len'. */ | |
102 | ||
103 | extern int warn_id_clash; | |
104 | extern int id_clash_len; | |
105 | ||
106 | /* Warn if a function returns an aggregate, | |
107 | since there are often incompatible calling conventions for doing this. */ | |
108 | ||
109 | extern int warn_aggregate_return; | |
110 | ||
111 | /* Nonzero if generating code to do profiling. */ | |
112 | ||
113 | extern int profile_flag; | |
114 | ||
115 | /* Nonzero if generating code to do profiling on the basis of basic blocks. */ | |
116 | ||
117 | extern int profile_block_flag; | |
118 | ||
119 | /* Nonzero for -pedantic switch: warn about anything | |
120 | that standard C forbids. */ | |
121 | ||
122 | extern int pedantic; | |
123 | ||
124 | /* Temporarily suppress certain warnings. | |
125 | This is set while reading code from a system header file. */ | |
126 | ||
127 | extern int in_system_header; | |
128 | ||
129 | /* Nonzero for -dp: annotate the assembly with a comment describing the | |
130 | pattern and alternative used. */ | |
131 | ||
132 | extern int flag_print_asm_name; | |
133 | \f | |
134 | /* Now the symbols that are set with `-f' switches. */ | |
135 | ||
136 | /* Nonzero means `char' should be signed. */ | |
137 | ||
138 | extern int flag_signed_char; | |
139 | ||
140 | /* Nonzero means give an enum type only as many bytes as it needs. */ | |
141 | ||
142 | extern int flag_short_enums; | |
143 | ||
144 | /* Nonzero for -fcaller-saves: allocate values in regs that need to | |
145 | be saved across function calls, if that produces overall better code. | |
146 | Optional now, so people can test it. */ | |
147 | ||
148 | extern int flag_caller_saves; | |
149 | ||
150 | /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ | |
151 | ||
152 | extern int flag_pcc_struct_return; | |
153 | ||
154 | /* Nonzero for -fforce-mem: load memory value into a register | |
155 | before arithmetic on it. This makes better cse but slower compilation. */ | |
156 | ||
157 | extern int flag_force_mem; | |
158 | ||
159 | /* Nonzero for -fforce-addr: load memory address into a register before | |
160 | reference to memory. This makes better cse but slower compilation. */ | |
161 | ||
162 | extern int flag_force_addr; | |
163 | ||
164 | /* Nonzero for -fdefer-pop: don't pop args after each function call; | |
165 | instead save them up to pop many calls' args with one insns. */ | |
166 | ||
167 | extern int flag_defer_pop; | |
168 | ||
169 | /* Nonzero for -ffloat-store: don't allocate floats and doubles | |
170 | in extended-precision registers. */ | |
171 | ||
172 | extern int flag_float_store; | |
173 | ||
174 | /* Nonzero enables strength-reduction in loop.c. */ | |
175 | ||
176 | extern int flag_strength_reduce; | |
177 | ||
178 | /* Nonzero enables loop unrolling in unroll.c. Only loops for which the | |
179 | number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, | |
180 | UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are | |
181 | unrolled. */ | |
182 | ||
183 | extern int flag_unroll_loops; | |
184 | ||
185 | /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. | |
186 | This is generally not a win. */ | |
187 | ||
188 | extern int flag_unroll_all_loops; | |
189 | ||
190 | /* Nonzero for -fcse-follow-jumps: | |
191 | have cse follow jumps to do a more extensive job. */ | |
192 | ||
193 | extern int flag_cse_follow_jumps; | |
194 | ||
8b3686ed RK |
195 | /* Nonzero for -fcse-skip-blocks: |
196 | have cse follow a branch around a block. */ | |
197 | ||
198 | extern int flag_cse_skip_blocks; | |
199 | ||
f7a29665 RS |
200 | /* Nonzero for -fexpensive-optimizations: |
201 | perform miscellaneous relatively-expensive optimizations. */ | |
202 | extern int flag_expensive_optimizations; | |
203 | ||
204 | /* Nonzero for -fwritable-strings: | |
205 | store string constants in data segment and don't uniquize them. */ | |
206 | ||
207 | extern int flag_writable_strings; | |
208 | ||
209 | /* Nonzero means don't put addresses of constant functions in registers. | |
210 | Used for compiling the Unix kernel, where strange substitutions are | |
211 | done on the assembly output. */ | |
212 | ||
213 | extern int flag_no_function_cse; | |
214 | ||
215 | /* Nonzero for -fomit-frame-pointer: | |
216 | don't make a frame pointer in simple functions that don't require one. */ | |
217 | ||
218 | extern int flag_omit_frame_pointer; | |
219 | ||
220 | /* Nonzero to inhibit use of define_optimization peephole opts. */ | |
221 | ||
222 | extern int flag_no_peephole; | |
223 | ||
224 | /* Nonzero means all references through pointers are volatile. */ | |
225 | ||
226 | extern int flag_volatile; | |
227 | ||
8b3686ed RK |
228 | /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math |
229 | operations in the interest of optimization. For example it allows | |
230 | GCC to assume arguments to sqrt are nonnegative numbers, allowing | |
231 | faster code for sqrt to be generated. */ | |
232 | ||
233 | extern int flag_fast_math; | |
234 | ||
f7a29665 RS |
235 | /* Nonzero means make functions that look like good inline candidates |
236 | go inline. */ | |
237 | ||
238 | extern int flag_inline_functions; | |
239 | ||
240 | /* Nonzero for -fkeep-inline-functions: even if we make a function | |
241 | go inline everywhere, keep its defintion around for debugging | |
242 | purposes. */ | |
243 | ||
244 | extern int flag_keep_inline_functions; | |
245 | ||
246 | /* Nonzero means that functions declared `inline' will be treated | |
247 | as `static'. Prevents generation of zillions of copies of unused | |
248 | static inline functions; instead, `inlines' are written out | |
249 | only when actually used. Used in conjunction with -g. Also | |
250 | does the right thing with #pragma interface. */ | |
251 | ||
252 | extern int flag_no_inline; | |
253 | ||
254 | /* Nonzero if we are only using compiler to check syntax errors. */ | |
255 | ||
256 | extern int flag_syntax_only; | |
257 | ||
d45cf215 | 258 | /* Nonzero means we should save auxiliary info into a .X file. */ |
f7a29665 RS |
259 | |
260 | extern int flag_gen_aux_info; | |
261 | ||
262 | /* Nonzero means make the text shared if supported. */ | |
263 | ||
264 | extern int flag_shared_data; | |
265 | ||
266 | /* flag_schedule_insns means schedule insns within basic blocks (before | |
267 | local_alloc). | |
268 | flag_schedule_insns_after_reload means schedule insns after | |
269 | global_alloc. */ | |
270 | ||
271 | extern int flag_schedule_insns; | |
272 | extern int flag_schedule_insns_after_reload; | |
273 | ||
274 | /* Nonzero means put things in delayed-branch slots if supported. */ | |
275 | ||
276 | extern int flag_delayed_branch; | |
277 | ||
278 | /* Nonzero means pretend it is OK to examine bits of target floats, | |
279 | even if that isn't true. The resulting code will have incorrect constants, | |
280 | but the same series of instructions that the native compiler would make. */ | |
281 | ||
282 | extern int flag_pretend_float; | |
283 | ||
284 | /* Nonzero means change certain warnings into errors. | |
285 | Usually these are warnings about failure to conform to some standard. */ | |
286 | ||
287 | extern int flag_pedantic_errors; | |
288 | ||
289 | /* Nonzero means generate position-independent code. | |
290 | This is not fully implemented yet. */ | |
291 | ||
292 | extern int flag_pic; | |
293 | ||
294 | /* Nonzero means place uninitialized global data in the bss section. */ | |
295 | ||
296 | extern int flag_no_common; | |
297 | ||
298 | /* -finhibit-size-directive inhibits output of .size for ELF. | |
299 | This is used only for compiling crtstuff.c, | |
300 | and it may be extended to other effects | |
301 | needed for crtstuff.c on other systems. */ | |
302 | extern int flag_inhibit_size_directive; | |
303 | ||
9a631e8e RS |
304 | /* -fverbose-asm causes extra commentary information to be produced in |
305 | the generated assembly code (to make it more readable). This option | |
306 | is generally only of use to those who actually need to read the | |
307 | generated assembly code (perhaps while debugging the compiler itself). */ | |
308 | ||
309 | extern int flag_verbose_asm; | |
310 | ||
f7a29665 RS |
311 | /* -fgnu-linker specifies use of the GNU linker for initializations. |
312 | -fno-gnu-linker says that collect will be used. */ | |
313 | extern int flag_gnu_linker; | |
314 | \f | |
315 | /* Other basic status info about current function. */ | |
316 | ||
317 | /* Nonzero means current function must be given a frame pointer. | |
318 | Set in stmt.c if anything is allocated on the stack there. | |
319 | Set in reload1.c if anything is allocated on the stack there. */ | |
320 | ||
321 | extern int frame_pointer_needed; | |
322 | ||
323 | /* Set nonzero if jump_optimize finds that control falls through | |
324 | at the end of the function. */ | |
325 | ||
326 | extern int can_reach_end; | |
327 | ||
328 | /* Nonzero if function being compiled receives nonlocal gotos | |
329 | from nested functions. */ | |
330 | ||
331 | extern int current_function_has_nonlocal_label; | |
332 |