gcc/flags.h

   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   XCOFF_DEBUG       /* Write IBM/Xcoff debug info (using dbxout.c).  */
  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
  46 /* Nonzero means use GNU-only extensions in the generated symbolic
  47    debugging information.  */
  48 extern int use_gnu_debug_info_extensions;
  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 means warn if inline function is too large.  */
  77
  78 extern int warn_inline;
  79
  80 /* Nonzero to warn about variables used before they are initialized.  */
  81
  82 extern int warn_uninitialized;
  83
  84 /* Nonzero means warn about all declarations which shadow others.   */
  85
  86 extern int warn_shadow;
  87
  88 /* Warn if a switch on an enum fails to have a case for every enum value.  */
  89
  90 extern int warn_switch;
  91
  92 /* Nonzero means warn about function definitions that default the return type
  93    or that use a null return and have a return-type other than void.  */
  94
  95 extern int warn_return_type;
  96
  97 /* Nonzero means warn about pointer casts that increase the required
  98    alignment of the target type (and might therefore lead to a crash
  99    due to a misaligned access).  */
 100
 101 extern int warn_cast_align;
 102
 103 /* Nonzero means warn that dbx info for template class methods isn't fully
 104    supported yet.  */
 105
 106 extern int warn_template_debugging;
 107
 108 /* Nonzero means warn about any identifiers that match in the first N
 109    characters.  The value N is in `id_clash_len'.  */
 110
 111 extern int warn_id_clash;
 112 extern int id_clash_len;
 113
 114 /* Warn if a function returns an aggregate,
 115    since there are often incompatible calling conventions for doing this.  */
 116
 117 extern int warn_aggregate_return;
 118
 119 /* Nonzero if generating code to do profiling.  */
 120
 121 extern int profile_flag;
 122
 123 /* Nonzero if generating code to do profiling on the basis of basic blocks.  */
 124
 125 extern int profile_block_flag;
 126
 127 /* Nonzero for -pedantic switch: warn about anything
 128    that standard C forbids.  */
 129
 130 extern int pedantic;
 131
 132 /* Temporarily suppress certain warnings.
 133    This is set while reading code from a system header file.  */
 134
 135 extern int in_system_header;
 136
 137 /* Nonzero for -dp: annotate the assembly with a comment describing the
 138    pattern and alternative used.  */
 139
 140 extern int flag_print_asm_name;
 141 \f
 142 /* Now the symbols that are set with `-f' switches.  */
 143
 144 /* Nonzero means `char' should be signed.  */
 145
 146 extern int flag_signed_char;
 147
 148 /* Nonzero means give an enum type only as many bytes as it needs.  */
 149
 150 extern int flag_short_enums;
 151
 152 /* Nonzero for -fcaller-saves: allocate values in regs that need to
 153    be saved across function calls, if that produces overall better code.
 154    Optional now, so people can test it.  */
 155
 156 extern int flag_caller_saves;
 157
 158 /* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
 159
 160 extern int flag_pcc_struct_return;
 161
 162 /* Nonzero for -fforce-mem: load memory value into a register
 163    before arithmetic on it.  This makes better cse but slower compilation.  */
 164
 165 extern int flag_force_mem;
 166
 167 /* Nonzero for -fforce-addr: load memory address into a register before
 168    reference to memory.  This makes better cse but slower compilation.  */
 169
 170 extern int flag_force_addr;
 171
 172 /* Nonzero for -fdefer-pop: don't pop args after each function call;
 173    instead save them up to pop many calls' args with one insns.  */
 174
 175 extern int flag_defer_pop;
 176
 177 /* Nonzero for -ffloat-store: don't allocate floats and doubles
 178    in extended-precision registers.  */
 179
 180 extern int flag_float_store;
 181
 182 /* Nonzero enables strength-reduction in loop.c.  */
 183
 184 extern int flag_strength_reduce;
 185
 186 /* Nonzero enables loop unrolling in unroll.c.  Only loops for which the
 187    number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
 188    UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
 189    unrolled.  */
 190
 191 extern int flag_unroll_loops;
 192
 193 /* Nonzero enables loop unrolling in unroll.c.  All loops are unrolled.
 194    This is generally not a win.  */
 195
 196 extern int flag_unroll_all_loops;
 197
 198 /* Nonzero for -fcse-follow-jumps:
 199    have cse follow jumps to do a more extensive job.  */
 200
 201 extern int flag_cse_follow_jumps;
 202
 203 /* Nonzero for -fcse-skip-blocks:
 204    have cse follow a branch around a block.  */
 205
 206 extern int flag_cse_skip_blocks;
 207
 208 /* Nonzero for -fexpensive-optimizations:
 209    perform miscellaneous relatively-expensive optimizations.  */
 210 extern int flag_expensive_optimizations;
 211
 212 /* Nonzero for -fwritable-strings:
 213    store string constants in data segment and don't uniquize them.  */
 214
 215 extern int flag_writable_strings;
 216
 217 /* Nonzero means don't put addresses of constant functions in registers.
 218    Used for compiling the Unix kernel, where strange substitutions are
 219    done on the assembly output.  */
 220
 221 extern int flag_no_function_cse;
 222
 223 /* Nonzero for -fomit-frame-pointer:
 224    don't make a frame pointer in simple functions that don't require one.  */
 225
 226 extern int flag_omit_frame_pointer;
 227
 228 /* Nonzero to inhibit use of define_optimization peephole opts.  */
 229
 230 extern int flag_no_peephole;
 231
 232 /* Nonzero means all references through pointers are volatile.  */
 233
 234 extern int flag_volatile;
 235
 236 /* Nonzero means treat all global and extern variables as global.  */
 237
 238 extern int flag_volatile_global;
 239
 240 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
 241    operations in the interest of optimization.  For example it allows
 242    GCC to assume arguments to sqrt are nonnegative numbers, allowing
 243    faster code for sqrt to be generated. */
 244
 245 extern int flag_fast_math;
 246
 247 /* Nonzero means make functions that look like good inline candidates
 248    go inline.  */
 249
 250 extern int flag_inline_functions;
 251
 252 /* Nonzero for -fkeep-inline-functions: even if we make a function
 253    go inline everywhere, keep its definition around for debugging
 254    purposes.  */
 255
 256 extern int flag_keep_inline_functions;
 257
 258 /* Nonzero means that functions declared `inline' will be treated
 259    as `static'.  Prevents generation of zillions of copies of unused
 260    static inline functions; instead, `inlines' are written out
 261    only when actually used.  Used in conjunction with -g.  Also
 262    does the right thing with #pragma interface.  */
 263
 264 extern int flag_no_inline;
 265
 266 /* Nonzero if we are only using compiler to check syntax errors.  */
 267
 268 extern int flag_syntax_only;
 269
 270 /* Nonzero means we should save auxiliary info into a .X file.  */
 271
 272 extern int flag_gen_aux_info;
 273
 274 /* Nonzero means make the text shared if supported.  */
 275
 276 extern int flag_shared_data;
 277
 278 /* flag_schedule_insns means schedule insns within basic blocks (before
 279    local_alloc).
 280    flag_schedule_insns_after_reload means schedule insns after
 281    global_alloc.  */
 282
 283 extern int flag_schedule_insns;
 284 extern int flag_schedule_insns_after_reload;
 285
 286 /* Nonzero means put things in delayed-branch slots if supported. */
 287
 288 extern int flag_delayed_branch;
 289
 290 /* Nonzero means pretend it is OK to examine bits of target floats,
 291    even if that isn't true.  The resulting code will have incorrect constants,
 292    but the same series of instructions that the native compiler would make.  */
 293
 294 extern int flag_pretend_float;
 295
 296 /* Nonzero means change certain warnings into errors.
 297    Usually these are warnings about failure to conform to some standard.  */
 298
 299 extern int flag_pedantic_errors;
 300
 301 /* Nonzero means generate position-independent code.
 302    This is not fully implemented yet.  */
 303
 304 extern int flag_pic;
 305
 306 /* Nonzero means place uninitialized global data in the bss section.  */
 307
 308 extern int flag_no_common;
 309
 310 /* -finhibit-size-directive inhibits output of .size for ELF.
 311    This is used only for compiling crtstuff.c,
 312    and it may be extended to other effects
 313    needed for crtstuff.c on other systems.  */
 314 extern int flag_inhibit_size_directive;
 315
 316 /* -fverbose-asm causes extra commentary information to be produced in
 317    the generated assembly code (to make it more readable).  This option
 318    is generally only of use to those who actually need to read the
 319    generated assembly code (perhaps while debugging the compiler itself).  */
 320
 321 extern int flag_verbose_asm;
 322
 323 /* -fgnu-linker specifies use of the GNU linker for initializations.
 324    -fno-gnu-linker says that collect will be used.  */
 325 extern int flag_gnu_linker;
 326 \f
 327 /* Other basic status info about current function.  */
 328
 329 /* Nonzero means current function must be given a frame pointer.
 330    Set in stmt.c if anything is allocated on the stack there.
 331    Set in reload1.c if anything is allocated on the stack there.  */
 332
 333 extern int frame_pointer_needed;
 334
 335 /* Set nonzero if jump_optimize finds that control falls through
 336    at the end of the function.  */
 337
 338 extern int can_reach_end;
 339
 340 /* Nonzero if function being compiled receives nonlocal gotos
 341    from nested functions.  */
 342
 343 extern int current_function_has_nonlocal_label;
 344