flags.h revision 18334
1/* Compilation switch flag definitions for GNU CC. 2 Copyright (C) 1987, 1988, 1994, 1995 Free Software Foundation, Inc. 3 4This file is part of GNU CC. 5 6GNU CC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11GNU CC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GNU CC; see the file COPYING. If not, write to 18the Free Software Foundation, 59 Temple Place - Suite 330, 19Boston, MA 02111-1307, USA. */ 20 21/* Name of the input .c file being compiled. */ 22extern char *main_input_filename; 23 24enum 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). */ 29 DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */ 30 XCOFF_DEBUG /* Write IBM/Xcoff debug info (using dbxout.c). */ 31}; 32 33/* Specify which kind of debugging info to generate. */ 34extern enum debug_info_type write_symbols; 35 36enum 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. */ 45extern enum debug_info_level debug_info_level; 46 47/* Nonzero means use GNU-only extensions in the generated symbolic 48 debugging information. */ 49extern int use_gnu_debug_info_extensions; 50 51/* Nonzero means do optimizations. -opt. */ 52 53extern int optimize; 54 55/* Nonzero means do stupid register allocation. -noreg. 56 Currently, this is 1 if `optimize' is 0. */ 57 58extern 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 63extern int quiet_flag; 64 65/* Don't print warning messages. -w. */ 66 67extern int inhibit_warnings; 68 69/* Do print extra warnings (such as for uninitialized variables). -W. */ 70 71extern int extra_warnings; 72 73/* Nonzero to warn about unused local variables. */ 74 75extern int warn_unused; 76 77/* Nonzero means warn if inline function is too large. */ 78 79extern int warn_inline; 80 81/* Nonzero to warn about variables used before they are initialized. */ 82 83extern int warn_uninitialized; 84 85/* Nonzero means warn about all declarations which shadow others. */ 86 87extern int warn_shadow; 88 89/* Warn if a switch on an enum fails to have a case for every enum value. */ 90 91extern 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 96extern 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 102extern int warn_cast_align; 103 104/* Nonzero means warn that dbx info for template class methods isn't fully 105 supported yet. */ 106 107extern int warn_template_debugging; 108 109/* Nonzero means warn about any identifiers that match in the first N 110 characters. The value N is in `id_clash_len'. */ 111 112extern int warn_id_clash; 113extern 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 119extern int warn_larger_than; 120extern unsigned larger_than_size; 121 122/* Warn if a function returns an aggregate, 123 since there are often incompatible calling conventions for doing this. */ 124 125extern int warn_aggregate_return; 126 127/* Nonzero if generating code to do profiling. */ 128 129extern int profile_flag; 130 131/* Nonzero if generating code to do profiling on the basis of basic blocks. */ 132 133extern int profile_block_flag; 134 135/* Nonzero for -pedantic switch: warn about anything 136 that standard C forbids. */ 137 138extern int pedantic; 139 140/* Temporarily suppress certain warnings. 141 This is set while reading code from a system header file. */ 142 143extern int in_system_header; 144 145/* Nonzero for -dp: annotate the assembly with a comment describing the 146 pattern and alternative used. */ 147 148extern int flag_print_asm_name; 149 150/* Now the symbols that are set with `-f' switches. */ 151 152/* Nonzero means `char' should be signed. */ 153 154extern int flag_signed_char; 155 156/* Nonzero means give an enum type only as many bytes as it needs. */ 157 158extern 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 164extern int flag_caller_saves; 165 166/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 167 168extern 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 173extern 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 178extern 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 183extern int flag_defer_pop; 184 185/* Nonzero for -ffloat-store: don't allocate floats and doubles 186 in extended-precision registers. */ 187 188extern int flag_float_store; 189 190/* Nonzero enables strength-reduction in loop.c. */ 191 192extern 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 199extern 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 204extern int flag_unroll_all_loops; 205 206/* Nonzero for -fcse-follow-jumps: 207 have cse follow jumps to do a more extensive job. */ 208 209extern int flag_cse_follow_jumps; 210 211/* Nonzero for -fcse-skip-blocks: 212 have cse follow a branch around a block. */ 213 214extern int flag_cse_skip_blocks; 215 216/* Nonzero for -fexpensive-optimizations: 217 perform miscellaneous relatively-expensive optimizations. */ 218extern int flag_expensive_optimizations; 219 220/* Nonzero for -fwritable-strings: 221 store string constants in data segment and don't uniquize them. */ 222 223extern 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 229extern 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 234extern int flag_omit_frame_pointer; 235 236/* Nonzero to inhibit use of define_optimization peephole opts. */ 237 238extern int flag_no_peephole; 239 240/* Nonzero means all references through pointers are volatile. */ 241 242extern int flag_volatile; 243 244/* Nonzero means treat all global and extern variables as global. */ 245 246extern int flag_volatile_global; 247 248/* 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 253extern int flag_fast_math; 254 255/* Nonzero means make functions that look like good inline candidates 256 go inline. */ 257 258extern int flag_inline_functions; 259 260/* Nonzero for -fkeep-inline-functions: even if we make a function 261 go inline everywhere, keep its definition around for debugging 262 purposes. */ 263 264extern 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 272extern int flag_no_inline; 273 274/* Nonzero if we are only using compiler to check syntax errors. */ 275 276extern int flag_syntax_only; 277 278/* Nonzero means we should save auxiliary info into a .X file. */ 279 280extern int flag_gen_aux_info; 281 282/* Nonzero means make the text shared if supported. */ 283 284extern 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 291extern int flag_schedule_insns; 292extern int flag_schedule_insns_after_reload; 293 294/* Nonzero means put things in delayed-branch slots if supported. */ 295 296extern int flag_delayed_branch; 297 298/* Nonzero means to run cleanups after CALL_EXPRs. */ 299 300extern int flag_short_temps; 301 302/* 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 306extern 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 311extern int flag_pedantic_errors; 312 313/* Nonzero means generate position-independent code. 314 This is not fully implemented yet. */ 315 316extern int flag_pic; 317 318/* Nonzero means place uninitialized global data in the bss section. */ 319 320extern int flag_no_common; 321 322/* -finhibit-size-directive inhibits output of .size for ELF. 323 This is used only for compiling crtstuff.c, 324 and it may be extended to other effects 325 needed for crtstuff.c on other systems. */ 326extern int flag_inhibit_size_directive; 327 328/* -fverbose-asm causes extra commentary information to be produced in 329 the generated assembly code (to make it more readable). This option 330 is generally only of use to those who actually need to read the 331 generated assembly code (perhaps while debugging the compiler itself). */ 332 333extern int flag_verbose_asm; 334 335/* -fgnu-linker specifies use of the GNU linker for initializations. 336 -fno-gnu-linker says that collect will be used. */ 337extern int flag_gnu_linker; 338 339/* Tag all structures with __attribute__(packed) */ 340extern int flag_pack_struct; 341 342/* Other basic status info about current function. */ 343 344/* Nonzero means current function must be given a frame pointer. 345 Set in stmt.c if anything is allocated on the stack there. 346 Set in reload1.c if anything is allocated on the stack there. */ 347 348extern int frame_pointer_needed; 349 350/* Set nonzero if jump_optimize finds that control falls through 351 at the end of the function. */ 352 353extern int can_reach_end; 354 355/* Nonzero if function being compiled receives nonlocal gotos 356 from nested functions. */ 357 358extern int current_function_has_nonlocal_label; 359 360/* Nonzero if function being compiled has nonlocal gotos to parent 361 function. */ 362 363extern int current_function_has_nonlocal_goto; 364