1 /* Compilation switch flag definitions for GNU CC.
2 Copyright (C) 1987, 1988 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
20 /* Name of the input .c file being compiled. */
21 extern char *main_input_filename;
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 XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */
32 /* Specify which kind of debugging info to generate. */
33 extern enum debug_info_type write_symbols;
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. */
43 /* Specify how much debugging info to generate. */
44 extern enum debug_info_level debug_info_level;
46 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
47 /* Nonzero means use GDB-only extensions of DBX format. */
48 extern int use_gdb_dbx_extensions;
51 /* Nonzero means do optimizations. -opt. */
55 /* Nonzero means do stupid register allocation. -noreg.
56 Currently, this is 1 if `optimize' is 0. */
58 extern int obey_regdecls;
60 /* Don't print functions as they are compiled and don't print
61 times taken by the various passes. -quiet. */
63 extern int quiet_flag;
65 /* Don't print warning messages. -w. */
67 extern int inhibit_warnings;
69 /* Do print extra warnings (such as for uninitialized variables). -W. */
71 extern int extra_warnings;
73 /* Nonzero to warn about unused local variables. */
75 extern int warn_unused;
77 /* Nonzero to warn about variables used before they are initialized. */
79 extern int warn_uninitialized;
81 /* Nonzero means warn about all declarations which shadow others. */
83 extern int warn_shadow;
85 /* Warn if a switch on an enum fails to have a case for every enum value. */
87 extern int warn_switch;
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. */
92 extern int warn_return_type;
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). */
98 extern int warn_cast_align;
100 /* Nonzero means warn about any identifiers that match in the first N
101 characters. The value N is in `id_clash_len'. */
103 extern int warn_id_clash;
104 extern int id_clash_len;
106 /* Warn if a function returns an aggregate,
107 since there are often incompatible calling conventions for doing this. */
109 extern int warn_aggregate_return;
111 /* Nonzero if generating code to do profiling. */
113 extern int profile_flag;
115 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
117 extern int profile_block_flag;
119 /* Nonzero for -pedantic switch: warn about anything
120 that standard C forbids. */
124 /* Temporarily suppress certain warnings.
125 This is set while reading code from a system header file. */
127 extern int in_system_header;
129 /* Nonzero for -dp: annotate the assembly with a comment describing the
130 pattern and alternative used. */
132 extern int flag_print_asm_name;
134 /* Now the symbols that are set with `-f' switches. */
136 /* Nonzero means `char' should be signed. */
138 extern int flag_signed_char;
140 /* Nonzero means give an enum type only as many bytes as it needs. */
142 extern int flag_short_enums;
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. */
148 extern int flag_caller_saves;
150 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
152 extern int flag_pcc_struct_return;
154 /* Nonzero for -fforce-mem: load memory value into a register
155 before arithmetic on it. This makes better cse but slower compilation. */
157 extern int flag_force_mem;
159 /* Nonzero for -fforce-addr: load memory address into a register before
160 reference to memory. This makes better cse but slower compilation. */
162 extern int flag_force_addr;
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. */
167 extern int flag_defer_pop;
169 /* Nonzero for -ffloat-store: don't allocate floats and doubles
170 in extended-precision registers. */
172 extern int flag_float_store;
174 /* Nonzero enables strength-reduction in loop.c. */
176 extern int flag_strength_reduce;
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
183 extern int flag_unroll_loops;
185 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
186 This is generally not a win. */
188 extern int flag_unroll_all_loops;
190 /* Nonzero for -fcse-follow-jumps:
191 have cse follow jumps to do a more extensive job. */
193 extern int flag_cse_follow_jumps;
195 /* Nonzero for -fexpensive-optimizations:
196 perform miscellaneous relatively-expensive optimizations. */
197 extern int flag_expensive_optimizations;
199 /* Nonzero for -fwritable-strings:
200 store string constants in data segment and don't uniquize them. */
202 extern int flag_writable_strings;
204 /* Nonzero means don't put addresses of constant functions in registers.
205 Used for compiling the Unix kernel, where strange substitutions are
206 done on the assembly output. */
208 extern int flag_no_function_cse;
210 /* Nonzero for -fomit-frame-pointer:
211 don't make a frame pointer in simple functions that don't require one. */
213 extern int flag_omit_frame_pointer;
215 /* Nonzero to inhibit use of define_optimization peephole opts. */
217 extern int flag_no_peephole;
219 /* Nonzero means all references through pointers are volatile. */
221 extern int flag_volatile;
223 /* Nonzero means make functions that look like good inline candidates
226 extern int flag_inline_functions;
228 /* Nonzero for -fkeep-inline-functions: even if we make a function
229 go inline everywhere, keep its defintion around for debugging
232 extern int flag_keep_inline_functions;
234 /* Nonzero means that functions declared `inline' will be treated
235 as `static'. Prevents generation of zillions of copies of unused
236 static inline functions; instead, `inlines' are written out
237 only when actually used. Used in conjunction with -g. Also
238 does the right thing with #pragma interface. */
240 extern int flag_no_inline;
242 /* Nonzero if we are only using compiler to check syntax errors. */
244 extern int flag_syntax_only;
246 /* Nonzero means we should save auxiliary info into a .X file. */
248 extern int flag_gen_aux_info;
250 /* Nonzero means make the text shared if supported. */
252 extern int flag_shared_data;
254 /* flag_schedule_insns means schedule insns within basic blocks (before
256 flag_schedule_insns_after_reload means schedule insns after
259 extern int flag_schedule_insns;
260 extern int flag_schedule_insns_after_reload;
262 /* Nonzero means put things in delayed-branch slots if supported. */
264 extern int flag_delayed_branch;
266 /* Nonzero means pretend it is OK to examine bits of target floats,
267 even if that isn't true. The resulting code will have incorrect constants,
268 but the same series of instructions that the native compiler would make. */
270 extern int flag_pretend_float;
272 /* Nonzero means change certain warnings into errors.
273 Usually these are warnings about failure to conform to some standard. */
275 extern int flag_pedantic_errors;
277 /* Nonzero means generate position-independent code.
278 This is not fully implemented yet. */
282 /* Nonzero means place uninitialized global data in the bss section. */
284 extern int flag_no_common;
286 /* -finhibit-size-directive inhibits output of .size for ELF.
287 This is used only for compiling crtstuff.c,
288 and it may be extended to other effects
289 needed for crtstuff.c on other systems. */
290 extern int flag_inhibit_size_directive;
292 /* -fgnu-linker specifies use of the GNU linker for initializations.
293 -fno-gnu-linker says that collect will be used. */
294 extern int flag_gnu_linker;
296 /* Other basic status info about current function. */
298 /* Nonzero means current function must be given a frame pointer.
299 Set in stmt.c if anything is allocated on the stack there.
300 Set in reload1.c if anything is allocated on the stack there. */
302 extern int frame_pointer_needed;
304 /* Set nonzero if jump_optimize finds that control falls through
305 at the end of the function. */
307 extern int can_reach_end;
309 /* Nonzero if function being compiled receives nonlocal gotos
310 from nested functions. */
312 extern int current_function_has_nonlocal_label;