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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). */ | |
28 | DWARF_DEBUG /* Write Dwarf debug info (using dwarfout.c). */ | |
29 | }; | |
30 | ||
31 | /* Specify which kind of debugging info to generate. */ | |
32 | extern enum debug_info_type write_symbols; | |
33 | ||
34 | enum debug_info_level | |
35 | { | |
36 | DINFO_LEVEL_NONE, /* Write no debugging info. */ | |
37 | DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */ | |
38 | DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */ | |
39 | DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */ | |
40 | }; | |
41 | ||
42 | /* Specify how much debugging info to generate. */ | |
43 | extern enum debug_info_level debug_info_level; | |
44 | ||
45 | #ifdef DBX_DEBUGGING_INFO | |
46 | /* Nonzero means use GDB-only extensions of DBX format. */ | |
47 | extern int use_gdb_dbx_extensions; | |
48 | #endif | |
49 | ||
50 | /* Nonzero means do optimizations. -opt. */ | |
51 | ||
52 | extern int optimize; | |
53 | ||
54 | /* Nonzero means do stupid register allocation. -noreg. | |
55 | Currently, this is 1 if `optimize' is 0. */ | |
56 | ||
57 | extern int obey_regdecls; | |
58 | ||
59 | /* Don't print functions as they are compiled and don't print | |
60 | times taken by the various passes. -quiet. */ | |
61 | ||
62 | extern int quiet_flag; | |
63 | ||
64 | /* Don't print warning messages. -w. */ | |
65 | ||
66 | extern int inhibit_warnings; | |
67 | ||
68 | /* Do print extra warnings (such as for uninitialized variables). -W. */ | |
69 | ||
70 | extern int extra_warnings; | |
71 | ||
72 | /* Nonzero to warn about unused local variables. */ | |
73 | ||
74 | extern int warn_unused; | |
75 | ||
76 | /* Nonzero to warn about variables used before they are initialized. */ | |
77 | ||
78 | extern int warn_uninitialized; | |
79 | ||
80 | /* Nonzero means warn about all declarations which shadow others. */ | |
81 | ||
82 | extern int warn_shadow; | |
83 | ||
84 | /* Warn if a switch on an enum fails to have a case for every enum value. */ | |
85 | ||
86 | extern int warn_switch; | |
87 | ||
88 | /* Nonzero means warn about function definitions that default the return type | |
89 | or that use a null return and have a return-type other than void. */ | |
90 | ||
91 | extern int warn_return_type; | |
92 | ||
93 | /* Nonzero means warn about pointer casts that increase the required | |
94 | alignment of the target type (and might therefore lead to a crash | |
95 | due to a misaligned access). */ | |
96 | ||
97 | extern int warn_cast_align; | |
98 | ||
99 | /* Nonzero means warn about any identifiers that match in the first N | |
100 | characters. The value N is in `id_clash_len'. */ | |
101 | ||
102 | extern int warn_id_clash; | |
103 | extern int id_clash_len; | |
104 | ||
105 | /* Warn if a function returns an aggregate, | |
106 | since there are often incompatible calling conventions for doing this. */ | |
107 | ||
108 | extern int warn_aggregate_return; | |
109 | ||
110 | /* Nonzero if generating code to do profiling. */ | |
111 | ||
112 | extern int profile_flag; | |
113 | ||
114 | /* Nonzero if generating code to do profiling on the basis of basic blocks. */ | |
115 | ||
116 | extern int profile_block_flag; | |
117 | ||
118 | /* Nonzero for -pedantic switch: warn about anything | |
119 | that standard C forbids. */ | |
120 | ||
121 | extern int pedantic; | |
122 | ||
123 | /* Temporarily suppress certain warnings. | |
124 | This is set while reading code from a system header file. */ | |
125 | ||
126 | extern int in_system_header; | |
127 | ||
128 | /* Nonzero for -dp: annotate the assembly with a comment describing the | |
129 | pattern and alternative used. */ | |
130 | ||
131 | extern int flag_print_asm_name; | |
132 | \f | |
133 | /* Now the symbols that are set with `-f' switches. */ | |
134 | ||
135 | /* Nonzero means `char' should be signed. */ | |
136 | ||
137 | extern int flag_signed_char; | |
138 | ||
139 | /* Nonzero means give an enum type only as many bytes as it needs. */ | |
140 | ||
141 | extern int flag_short_enums; | |
142 | ||
143 | /* Nonzero for -fcaller-saves: allocate values in regs that need to | |
144 | be saved across function calls, if that produces overall better code. | |
145 | Optional now, so people can test it. */ | |
146 | ||
147 | extern int flag_caller_saves; | |
148 | ||
149 | /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ | |
150 | ||
151 | extern int flag_pcc_struct_return; | |
152 | ||
153 | /* Nonzero for -fforce-mem: load memory value into a register | |
154 | before arithmetic on it. This makes better cse but slower compilation. */ | |
155 | ||
156 | extern int flag_force_mem; | |
157 | ||
158 | /* Nonzero for -fforce-addr: load memory address into a register before | |
159 | reference to memory. This makes better cse but slower compilation. */ | |
160 | ||
161 | extern int flag_force_addr; | |
162 | ||
163 | /* Nonzero for -fdefer-pop: don't pop args after each function call; | |
164 | instead save them up to pop many calls' args with one insns. */ | |
165 | ||
166 | extern int flag_defer_pop; | |
167 | ||
168 | /* Nonzero for -ffloat-store: don't allocate floats and doubles | |
169 | in extended-precision registers. */ | |
170 | ||
171 | extern int flag_float_store; | |
172 | ||
173 | /* Nonzero enables strength-reduction in loop.c. */ | |
174 | ||
175 | extern int flag_strength_reduce; | |
176 | ||
177 | /* Nonzero enables loop unrolling in unroll.c. Only loops for which the | |
178 | number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, | |
179 | UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are | |
180 | unrolled. */ | |
181 | ||
182 | extern int flag_unroll_loops; | |
183 | ||
184 | /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. | |
185 | This is generally not a win. */ | |
186 | ||
187 | extern int flag_unroll_all_loops; | |
188 | ||
189 | /* Nonzero for -fcse-follow-jumps: | |
190 | have cse follow jumps to do a more extensive job. */ | |
191 | ||
192 | extern int flag_cse_follow_jumps; | |
193 | ||
194 | /* Nonzero for -fexpensive-optimizations: | |
195 | perform miscellaneous relatively-expensive optimizations. */ | |
196 | extern int flag_expensive_optimizations; | |
197 | ||
198 | /* Nonzero for -fwritable-strings: | |
199 | store string constants in data segment and don't uniquize them. */ | |
200 | ||
201 | extern int flag_writable_strings; | |
202 | ||
203 | /* Nonzero means don't put addresses of constant functions in registers. | |
204 | Used for compiling the Unix kernel, where strange substitutions are | |
205 | done on the assembly output. */ | |
206 | ||
207 | extern int flag_no_function_cse; | |
208 | ||
209 | /* Nonzero for -fomit-frame-pointer: | |
210 | don't make a frame pointer in simple functions that don't require one. */ | |
211 | ||
212 | extern int flag_omit_frame_pointer; | |
213 | ||
214 | /* Nonzero to inhibit use of define_optimization peephole opts. */ | |
215 | ||
216 | extern int flag_no_peephole; | |
217 | ||
218 | /* Nonzero means all references through pointers are volatile. */ | |
219 | ||
220 | extern int flag_volatile; | |
221 | ||
222 | /* Nonzero means make functions that look like good inline candidates | |
223 | go inline. */ | |
224 | ||
225 | extern int flag_inline_functions; | |
226 | ||
227 | /* Nonzero for -fkeep-inline-functions: even if we make a function | |
228 | go inline everywhere, keep its defintion around for debugging | |
229 | purposes. */ | |
230 | ||
231 | extern int flag_keep_inline_functions; | |
232 | ||
233 | /* Nonzero means that functions declared `inline' will be treated | |
234 | as `static'. Prevents generation of zillions of copies of unused | |
235 | static inline functions; instead, `inlines' are written out | |
236 | only when actually used. Used in conjunction with -g. Also | |
237 | does the right thing with #pragma interface. */ | |
238 | ||
239 | extern int flag_no_inline; | |
240 | ||
241 | /* Nonzero if we are only using compiler to check syntax errors. */ | |
242 | ||
243 | extern int flag_syntax_only; | |
244 | ||
245 | /* Nonzero means we should save auxilliary info into a .X file. */ | |
246 | ||
247 | extern int flag_gen_aux_info; | |
248 | ||
249 | /* Nonzero means make the text shared if supported. */ | |
250 | ||
251 | extern int flag_shared_data; | |
252 | ||
253 | /* flag_schedule_insns means schedule insns within basic blocks (before | |
254 | local_alloc). | |
255 | flag_schedule_insns_after_reload means schedule insns after | |
256 | global_alloc. */ | |
257 | ||
258 | extern int flag_schedule_insns; | |
259 | extern int flag_schedule_insns_after_reload; | |
260 | ||
261 | /* Nonzero means put things in delayed-branch slots if supported. */ | |
262 | ||
263 | extern int flag_delayed_branch; | |
264 | ||
265 | /* Nonzero means pretend it is OK to examine bits of target floats, | |
266 | even if that isn't true. The resulting code will have incorrect constants, | |
267 | but the same series of instructions that the native compiler would make. */ | |
268 | ||
269 | extern int flag_pretend_float; | |
270 | ||
271 | /* Nonzero means change certain warnings into errors. | |
272 | Usually these are warnings about failure to conform to some standard. */ | |
273 | ||
274 | extern int flag_pedantic_errors; | |
275 | ||
276 | /* Nonzero means generate position-independent code. | |
277 | This is not fully implemented yet. */ | |
278 | ||
279 | extern int flag_pic; | |
280 | ||
281 | /* Nonzero means place uninitialized global data in the bss section. */ | |
282 | ||
283 | extern int flag_no_common; | |
284 | ||
285 | /* -finhibit-size-directive inhibits output of .size for ELF. | |
286 | This is used only for compiling crtstuff.c, | |
287 | and it may be extended to other effects | |
288 | needed for crtstuff.c on other systems. */ | |
289 | extern int flag_inhibit_size_directive; | |
290 | ||
291 | /* -fgnu-linker specifies use of the GNU linker for initializations. | |
292 | -fno-gnu-linker says that collect will be used. */ | |
293 | extern int flag_gnu_linker; | |
294 | \f | |
295 | /* Other basic status info about current function. */ | |
296 | ||
297 | /* Nonzero means current function must be given a frame pointer. | |
298 | Set in stmt.c if anything is allocated on the stack there. | |
299 | Set in reload1.c if anything is allocated on the stack there. */ | |
300 | ||
301 | extern int frame_pointer_needed; | |
302 | ||
303 | /* Set nonzero if jump_optimize finds that control falls through | |
304 | at the end of the function. */ | |
305 | ||
306 | extern int can_reach_end; | |
307 | ||
308 | /* Nonzero if function being compiled receives nonlocal gotos | |
309 | from nested functions. */ | |
310 | ||
311 | extern int current_function_has_nonlocal_label; | |
312 |