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 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 -fcse-skip-blocks:
 195    have cse follow a branch around a block.  */
 196
 197 extern int flag_cse_skip_blocks;
 198
 199 /* Nonzero for -fexpensive-optimizations:
 200    perform miscellaneous relatively-expensive optimizations.  */
 201 extern int flag_expensive_optimizations;
 202
 203 /* Nonzero for -fwritable-strings:
 204    store string constants in data segment and don't uniquize them.  */
 205
 206 extern int flag_writable_strings;
 207
 208 /* Nonzero means don't put addresses of constant functions in registers.
 209    Used for compiling the Unix kernel, where strange substitutions are
 210    done on the assembly output.  */
 211
 212 extern int flag_no_function_cse;
 213
 214 /* Nonzero for -fomit-frame-pointer:
 215    don't make a frame pointer in simple functions that don't require one.  */
 216
 217 extern int flag_omit_frame_pointer;
 218
 219 /* Nonzero to inhibit use of define_optimization peephole opts.  */
 220
 221 extern int flag_no_peephole;
 222
 223 /* Nonzero means all references through pointers are volatile.  */
 224
 225 extern int flag_volatile;
 226
 227 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
 228    operations in the interest of optimization.  For example it allows
 229    GCC to assume arguments to sqrt are nonnegative numbers, allowing
 230    faster code for sqrt to be generated. */
 231
 232 extern int flag_fast_math;
 233
 234 /* Nonzero means make functions that look like good inline candidates
 235    go inline.  */
 236
 237 extern int flag_inline_functions;
 238
 239 /* Nonzero for -fkeep-inline-functions: even if we make a function
 240    go inline everywhere, keep its defintion around for debugging
 241    purposes.  */
 242
 243 extern int flag_keep_inline_functions;
 244
 245 /* Nonzero means that functions declared `inline' will be treated
 246    as `static'.  Prevents generation of zillions of copies of unused
 247    static inline functions; instead, `inlines' are written out
 248    only when actually used.  Used in conjunction with -g.  Also
 249    does the right thing with #pragma interface.  */
 250
 251 extern int flag_no_inline;
 252
 253 /* Nonzero if we are only using compiler to check syntax errors.  */
 254
 255 extern int flag_syntax_only;
 256
 257 /* Nonzero means we should save auxiliary info into a .X file.  */
 258
 259 extern int flag_gen_aux_info;
 260
 261 /* Nonzero means make the text shared if supported.  */
 262
 263 extern int flag_shared_data;
 264
 265 /* flag_schedule_insns means schedule insns within basic blocks (before
 266    local_alloc).
 267    flag_schedule_insns_after_reload means schedule insns after
 268    global_alloc.  */
 269
 270 extern int flag_schedule_insns;
 271 extern int flag_schedule_insns_after_reload;
 272
 273 /* Nonzero means put things in delayed-branch slots if supported. */
 274
 275 extern int flag_delayed_branch;
 276
 277 /* Nonzero means pretend it is OK to examine bits of target floats,
 278    even if that isn't true.  The resulting code will have incorrect constants,
 279    but the same series of instructions that the native compiler would make.  */
 280
 281 extern int flag_pretend_float;
 282
 283 /* Nonzero means change certain warnings into errors.
 284    Usually these are warnings about failure to conform to some standard.  */
 285
 286 extern int flag_pedantic_errors;
 287
 288 /* Nonzero means generate position-independent code.
 289    This is not fully implemented yet.  */
 290
 291 extern int flag_pic;
 292
 293 /* Nonzero means place uninitialized global data in the bss section.  */
 294
 295 extern int flag_no_common;
 296
 297 /* -finhibit-size-directive inhibits output of .size for ELF.
 298    This is used only for compiling crtstuff.c,
 299    and it may be extended to other effects
 300    needed for crtstuff.c on other systems.  */
 301 extern int flag_inhibit_size_directive;
 302
 303 /* -fverbose-asm causes extra commentary information to be produced in
 304    the generated assembly code (to make it more readable).  This option
 305    is generally only of use to those who actually need to read the
 306    generated assembly code (perhaps while debugging the compiler itself).  */
 307
 308 extern int flag_verbose_asm;
 309
 310 /* -fgnu-linker specifies use of the GNU linker for initializations.
 311    -fno-gnu-linker says that collect will be used.  */
 312 extern int flag_gnu_linker;
 313 \f
 314 /* Other basic status info about current function.  */
 315
 316 /* Nonzero means current function must be given a frame pointer.
 317    Set in stmt.c if anything is allocated on the stack there.
 318    Set in reload1.c if anything is allocated on the stack there.  */
 319
 320 extern int frame_pointer_needed;
 321
 322 /* Set nonzero if jump_optimize finds that control falls through
 323    at the end of the function.  */
 324
 325 extern int can_reach_end;
 326
 327 /* Nonzero if function being compiled receives nonlocal gotos
 328    from nested functions.  */
 329
 330 extern int current_function_has_nonlocal_label;
 331