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