flags.h revision 117404
1123992Ssobomax/* Compilation switch flag definitions for GCC. 2103026Ssobomax Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002 3103026Ssobomax Free Software Foundation, Inc. 4139823Simp 5103026SsobomaxThis file is part of GCC. 6103026Ssobomax 7103026SsobomaxGCC is free software; you can redistribute it and/or modify it under 8103026Ssobomaxthe terms of the GNU General Public License as published by the Free 9103026SsobomaxSoftware Foundation; either version 2, or (at your option) any later 10103026Ssobomaxversion. 11103026Ssobomax 12103026SsobomaxGCC is distributed in the hope that it will be useful, but WITHOUT ANY 13103026SsobomaxWARRANTY; without even the implied warranty of MERCHANTABILITY or 14103026SsobomaxFITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15103026Ssobomaxfor more details. 16103026Ssobomax 17103026SsobomaxYou should have received a copy of the GNU General Public License 18103026Ssobomaxalong with GCC; see the file COPYING. If not, write to the Free 19125020SsobomaxSoftware Foundation, 59 Temple Place - Suite 330, Boston, MA 20103026Ssobomax02111-1307, USA. */ 21103026Ssobomax 22103026Ssobomax#ifndef GCC_FLAGS_H 23103026Ssobomax#define GCC_FLAGS_H 24103026Ssobomax 25103026Ssobomax/* Name of the input .c file being compiled. */ 26103026Ssobomaxextern const char *main_input_filename; 27103026Ssobomax 28103026Ssobomaxenum debug_info_type 29103026Ssobomax{ 30103026Ssobomax NO_DEBUG, /* Write no debug info. */ 31103026Ssobomax DBX_DEBUG, /* Write BSD .stabs for DBX (using dbxout.c). */ 32103026Ssobomax SDB_DEBUG, /* Write COFF for (old) SDB (using sdbout.c). */ 33103026Ssobomax DWARF_DEBUG, /* Write Dwarf debug info (using dwarfout.c). */ 34103026Ssobomax DWARF2_DEBUG, /* Write Dwarf v2 debug info (using dwarf2out.c). */ 35103026Ssobomax XCOFF_DEBUG, /* Write IBM/Xcoff debug info (using dbxout.c). */ 36103026Ssobomax VMS_DEBUG, /* Write VMS debug info (using vmsdbgout.c). */ 37103120Ssobomax VMS_AND_DWARF2_DEBUG /* Write VMS debug info (using vmsdbgout.c). 38103026Ssobomax and DWARF v2 debug info (using dwarf2out.c). */ 39103026Ssobomax}; 40125024Ssobomax 41125024Ssobomax/* Specify which kind of debugging info to generate. */ 42125024Ssobomaxextern enum debug_info_type write_symbols; 43125024Ssobomax 44125024Ssobomaxenum debug_info_level 45125024Ssobomax{ 46125024Ssobomax DINFO_LEVEL_NONE, /* Write no debugging info. */ 47125024Ssobomax DINFO_LEVEL_TERSE, /* Write minimal info to support tracebacks only. */ 48125024Ssobomax DINFO_LEVEL_NORMAL, /* Write info for all declarations (and line table). */ 49125024Ssobomax DINFO_LEVEL_VERBOSE /* Write normal info plus #define/#undef info. */ 50103026Ssobomax}; 51147256Sbrooks 52103026Ssobomax/* Specify how much debugging info to generate. */ 53103026Ssobomaxextern enum debug_info_level debug_info_level; 54103026Ssobomax 55178888Sjulian/* Nonzero means use GNU-only extensions in the generated symbolic 56103026Ssobomax debugging information. */ 57103026Ssobomaxextern int use_gnu_debug_info_extensions; 58103026Ssobomax 59103026Ssobomax/* Nonzero means do optimizations. -opt. */ 60103026Ssobomax 61103026Ssobomaxextern int optimize; 62103026Ssobomax 63103026Ssobomax/* Nonzero means optimize for size. -Os. */ 64179894Sthompsa 65179894Sthompsaextern int optimize_size; 66179894Sthompsa 67125024Ssobomax/* Don't print functions as they are compiled and don't print 68125020Ssobomax times taken by the various passes. -quiet. */ 69147256Sbrooks 70103026Ssobomaxextern int quiet_flag; 71103026Ssobomax 72103026Ssobomax/* Print times taken by the various passes. -ftime-report. */ 73103026Ssobomax 74125020Ssobomaxextern int time_report; 75103026Ssobomax 76179894Sthompsa/* Print memory still in use at end of compilation (which may have little 77125020Ssobomax to do with peak memory consumption). -fmem-report. */ 78125020Ssobomax 79103026Ssobomaxextern int mem_report; 80103026Ssobomax 81103026Ssobomax/* Don't print warning messages. -w. */ 82103026Ssobomax 83103026Ssobomaxextern int inhibit_warnings; 84103026Ssobomax 85103026Ssobomax/* Don't suppress warnings from system headers. -Wsystem-headers. */ 86103026Ssobomax 87103026Ssobomaxextern int warn_system_headers; 88103026Ssobomax 89103026Ssobomax/* Do print extra warnings (such as for uninitialized variables). -W. */ 90103026Ssobomax 91103026Ssobomaxextern int extra_warnings; 92103026Ssobomax 93103026Ssobomax/* Nonzero to warn about unused variables, functions et.al. Use 94103026Ssobomax set_Wunused() to update the -Wunused-* flags that correspond to the 95103026Ssobomax -Wunused option. */ 96103842Salfred 97103026Ssobomaxextern void set_Wunused PARAMS ((int setting)); 98103026Ssobomax 99103026Ssobomaxextern int warn_unused_function; 100103026Ssobomaxextern int warn_unused_label; 101103842Salfredextern int warn_unused_parameter; 102103026Ssobomaxextern int warn_unused_variable; 103103026Ssobomaxextern int warn_unused_value; 104103026Ssobomax 105103026Ssobomax/* Nonzero to warn about code which is never reached. */ 106103026Ssobomax 107103026Ssobomaxextern int warn_notreached; 108103026Ssobomax 109179894Sthompsa/* Nonzero means warn if inline function is too large. */ 110103026Ssobomax 111103026Ssobomaxextern int warn_inline; 112103026Ssobomax 113103026Ssobomax/* Nonzero to warn about variables used before they are initialized. */ 114103026Ssobomax 115103026Ssobomaxextern int warn_uninitialized; 116103026Ssobomax 117103026Ssobomax/* Zero if unknown pragmas are ignored 118107670Ssobomax One if the compiler should warn about an unknown pragma not in 119107670Ssobomax a system include file. 120107670Ssobomax Greater than one if the compiler should warn for all unknown 121107670Ssobomax pragmas. */ 122107670Ssobomax 123107670Ssobomaxextern int warn_unknown_pragmas; 124107670Ssobomax 125103026Ssobomax/* Nonzero means warn about all declarations which shadow others. */ 126103026Ssobomax 127103026Ssobomaxextern int warn_shadow; 128103026Ssobomax 129123992Ssobomax/* Warn if a switch on an enum, that does not have a default case, 130103026Ssobomax fails to have a case for every enum value. */ 131125020Ssobomax 132103026Ssobomaxextern int warn_switch; 133103026Ssobomax 134103026Ssobomax/* Warn if a switch does not have a default case. */ 135103026Ssobomax 136103026Ssobomaxextern int warn_switch_default; 137103026Ssobomax 138103026Ssobomax/* Warn if a switch on an enum fails to have a case for every enum 139103026Ssobomax value (regardless of the presence or otherwise of a default case). */ 140103026Ssobomax 141103026Ssobomaxextern int warn_switch_enum; 142103026Ssobomax 143103026Ssobomax/* Nonzero means warn about function definitions that default the return type 144103026Ssobomax or that use a null return and have a return-type other than void. */ 145103026Ssobomax 146103026Ssobomaxextern int warn_return_type; 147103026Ssobomax 148103842Salfred/* Warn about functions which might be candidates for attribute noreturn. */ 149103026Ssobomax 150103026Ssobomaxextern int warn_missing_noreturn; 151103026Ssobomax 152103026Ssobomax/* Nonzero means warn about pointer casts that increase the required 153103842Salfred alignment of the target type (and might therefore lead to a crash 154103026Ssobomax due to a misaligned access). */ 155103026Ssobomax 156103026Ssobomaxextern int warn_cast_align; 157103026Ssobomax 158103026Ssobomax/* Nonzero means warn about any objects definitions whose size is larger 159103026Ssobomax than N bytes. Also want about function definitions whose returned 160103026Ssobomax values are larger than N bytes. The value N is in `larger_than_size'. */ 161103026Ssobomax 162103120Ssobomaxextern int warn_larger_than; 163103120Ssobomaxextern HOST_WIDE_INT larger_than_size; 164125020Ssobomax 165125020Ssobomax/* Warn if a function returns an aggregate, 166103026Ssobomax since there are often incompatible calling conventions for doing this. */ 167103026Ssobomax 168103026Ssobomaxextern int warn_aggregate_return; 169125020Ssobomax 170103026Ssobomax/* Warn if packed attribute on struct is unnecessary and inefficient. */ 171103026Ssobomax 172103026Ssobomaxextern int warn_packed; 173103026Ssobomax 174179894Sthompsa/* Warn when gcc pads a structure to an alignment boundary. */ 175179894Sthompsa 176103026Ssobomaxextern int warn_padded; 177103026Ssobomax 178103026Ssobomax/* Warn when an optimization pass is disabled. */ 179127307Srwatson 180103026Ssobomaxextern int warn_disabled_optimization; 181103026Ssobomax 182123992Ssobomax/* Nonzero means warn about uses of __attribute__((deprecated)) 183103026Ssobomax declarations. */ 184103026Ssobomax 185103026Ssobomaxextern int warn_deprecated_decl; 186 187/* Nonzero means warn about constructs which might not be strict 188 aliasing safe. */ 189 190extern int warn_strict_aliasing; 191 192/* Nonzero if generating code to do profiling. */ 193 194extern int profile_flag; 195 196/* Nonzero if generating code to profile program flow graph arcs. */ 197 198extern int profile_arc_flag; 199 200/* Nonzero if generating info for gcov to calculate line test coverage. */ 201 202extern int flag_test_coverage; 203 204/* Nonzero indicates that branch taken probabilities should be calculated. */ 205 206extern int flag_branch_probabilities; 207 208/* Nonzero if basic blocks should be reordered. */ 209 210extern int flag_reorder_blocks; 211 212/* Nonzero if functions should be reordered. */ 213 214extern int flag_reorder_functions; 215 216/* Nonzero if registers should be renamed. */ 217 218extern int flag_rename_registers; 219 220/* Nonzero for -pedantic switch: warn about anything 221 that standard C forbids. */ 222 223extern int pedantic; 224 225/* Temporarily suppress certain warnings. 226 This is set while reading code from a system header file. */ 227 228extern int in_system_header; 229 230/* Nonzero for -dp: annotate the assembly with a comment describing the 231 pattern and alternative used. */ 232 233extern int flag_print_asm_name; 234 235/* Now the symbols that are set with `-f' switches. */ 236 237/* Nonzero means `char' should be signed. */ 238 239extern int flag_signed_char; 240 241/* Nonzero means give an enum type only as many bytes as it needs. */ 242 243extern int flag_short_enums; 244 245/* Nonzero for -fcaller-saves: allocate values in regs that need to 246 be saved across function calls, if that produces overall better code. 247 Optional now, so people can test it. */ 248 249extern int flag_caller_saves; 250 251/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 252 253extern int flag_pcc_struct_return; 254 255/* Nonzero for -fforce-mem: load memory value into a register 256 before arithmetic on it. This makes better cse but slower compilation. */ 257 258extern int flag_force_mem; 259 260/* Nonzero for -fforce-addr: load memory address into a register before 261 reference to memory. This makes better cse but slower compilation. */ 262 263extern int flag_force_addr; 264 265/* Nonzero for -fdefer-pop: don't pop args after each function call; 266 instead save them up to pop many calls' args with one insns. */ 267 268extern int flag_defer_pop; 269 270/* Nonzero for -ffloat-store: don't allocate floats and doubles 271 in extended-precision registers. */ 272 273extern int flag_float_store; 274 275/* Nonzero enables strength-reduction in loop.c. */ 276 277extern int flag_strength_reduce; 278 279/* Nonzero enables loop unrolling in unroll.c. Only loops for which the 280 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, 281 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are 282 unrolled. */ 283 284extern int flag_unroll_loops; 285 286/* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. 287 This is generally not a win. */ 288 289extern int flag_unroll_all_loops; 290 291/* Nonzero forces all invariant computations in loops to be moved 292 outside the loop. */ 293 294extern int flag_move_all_movables; 295 296/* Nonzero enables prefetch optimizations for arrays in loops. */ 297 298extern int flag_prefetch_loop_arrays; 299 300/* Nonzero forces all general induction variables in loops to be 301 strength reduced. */ 302 303extern int flag_reduce_all_givs; 304 305/* Nonzero for -fcse-follow-jumps: 306 have cse follow jumps to do a more extensive job. */ 307 308extern int flag_cse_follow_jumps; 309 310/* Nonzero for -fcse-skip-blocks: 311 have cse follow a branch around a block. */ 312 313extern int flag_cse_skip_blocks; 314 315/* Nonzero for -fexpensive-optimizations: 316 perform miscellaneous relatively-expensive optimizations. */ 317extern int flag_expensive_optimizations; 318 319/* Nonzero for -fwritable-strings: 320 store string constants in data segment and don't uniquize them. */ 321 322extern int flag_writable_strings; 323 324/* Nonzero means don't put addresses of constant functions in registers. 325 Used for compiling the Unix kernel, where strange substitutions are 326 done on the assembly output. */ 327 328extern int flag_no_function_cse; 329 330/* Nonzero for -fomit-frame-pointer: 331 don't make a frame pointer in simple functions that don't require one. */ 332 333extern int flag_omit_frame_pointer; 334 335/* Nonzero to inhibit use of define_optimization peephole opts. */ 336 337extern int flag_no_peephole; 338 339/* Nonzero means all references through pointers are volatile. */ 340 341extern int flag_volatile; 342 343/* Nonzero means treat all global and extern variables as volatile. */ 344 345extern int flag_volatile_global; 346 347/* Nonzero means treat all static variables as volatile. */ 348 349extern int flag_volatile_static; 350 351/* Nonzero allows GCC to optimize sibling and tail recursive calls. */ 352 353extern int flag_optimize_sibling_calls; 354 355/* Nonzero means the front end generally wants `errno' maintained by math 356 operations, like built-in SQRT. */ 357 358extern int flag_errno_math; 359 360/* Nonzero means that unsafe floating-point math optimizations are allowed 361 for the sake of speed. IEEE compliance is not guaranteed, and operations 362 are allowed to assume that their arguments and results are "normal" 363 (e.g., nonnegative for SQRT). */ 364 365extern int flag_unsafe_math_optimizations; 366 367/* Nonzero means that no NaNs or +-Infs are expected. */ 368 369extern int flag_finite_math_only; 370 371/* Zero means that floating-point math operations cannot generate a 372 (user-visible) trap. This is the case, for example, in nonstop 373 IEEE 754 arithmetic. */ 374 375extern int flag_trapping_math; 376 377/* 0 means straightforward implementation of complex divide acceptable. 378 1 means wide ranges of inputs must work for complex divide. 379 2 means C99-like requirements for complex divide (not yet implemented). */ 380 381extern int flag_complex_divide_method; 382 383/* Nonzero means to run loop optimizations twice. */ 384 385extern int flag_rerun_loop_opt; 386 387/* Nonzero means make functions that look like good inline candidates 388 go inline. */ 389 390extern int flag_inline_functions; 391 392/* Nonzero for -fkeep-inline-functions: even if we make a function 393 go inline everywhere, keep its definition around for debugging 394 purposes. */ 395 396extern int flag_keep_inline_functions; 397 398/* Nonzero means that functions declared `inline' will be treated 399 as `static'. Prevents generation of zillions of copies of unused 400 static inline functions; instead, `inlines' are written out 401 only when actually used. Used in conjunction with -g. Also 402 does the right thing with #pragma interface. */ 403 404extern int flag_no_inline; 405 406/* Nonzero means that we don't want inlining by virtue of -fno-inline, 407 not just because the tree inliner turned us off. */ 408 409extern int flag_really_no_inline; 410 411/* Nonzero if we are only using compiler to check syntax errors. */ 412 413extern int flag_syntax_only; 414 415/* Nonzero means we should save auxiliary info into a .X file. */ 416 417extern int flag_gen_aux_info; 418 419/* Nonzero means make the text shared if supported. */ 420 421extern int flag_shared_data; 422 423/* flag_schedule_insns means schedule insns within basic blocks (before 424 local_alloc). 425 flag_schedule_insns_after_reload means schedule insns after 426 global_alloc. */ 427 428extern int flag_schedule_insns; 429extern int flag_schedule_insns_after_reload; 430 431/* The following flags have effect only for scheduling before register 432 allocation: 433 434 flag_schedule_interblock means schedule insns across basic blocks. 435 flag_schedule_speculative means allow speculative motion of non-load insns. 436 flag_schedule_speculative_load means allow speculative motion of some 437 load insns. 438 flag_schedule_speculative_load_dangerous allows speculative motion of more 439 load insns. */ 440 441extern int flag_schedule_interblock; 442extern int flag_schedule_speculative; 443extern int flag_schedule_speculative_load; 444extern int flag_schedule_speculative_load_dangerous; 445 446/* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple 447 by a cheaper branch, on a count register. */ 448extern int flag_branch_on_count_reg; 449 450/* This option is set to 1 on -fsingle-precision-constant option which is 451 used to convert the floating point constants to single precision 452 constants. */ 453 454extern int flag_single_precision_constant; 455 456/* Nonzero means put things in delayed-branch slots if supported. */ 457 458extern int flag_delayed_branch; 459 460/* Nonzero means suppress output of instruction numbers and line number 461 notes in debugging dumps. */ 462 463extern int flag_dump_unnumbered; 464 465/* Nonzero means change certain warnings into errors. 466 Usually these are warnings about failure to conform to some standard. */ 467 468extern int flag_pedantic_errors; 469 470/* Nonzero means generate position-independent code. 1 vs 2 for a 471 target-dependent "small" or "large" mode. */ 472 473extern int flag_pic; 474 475/* Nonzero means generate extra code for exception handling and enable 476 exception handling. */ 477 478extern int flag_exceptions; 479 480/* Nonzero means generate frame unwind info table when supported */ 481 482extern int flag_unwind_tables; 483 484/* Nonzero means generate frame unwind info table exact at each insn boundary */ 485 486extern int flag_asynchronous_unwind_tables; 487 488/* Nonzero means don't place uninitialized global data in common storage 489 by default. */ 490 491extern int flag_no_common; 492 493/* -finhibit-size-directive inhibits output of .size for ELF. 494 This is used only for compiling crtstuff.c, 495 and it may be extended to other effects 496 needed for crtstuff.c on other systems. */ 497extern int flag_inhibit_size_directive; 498 499/* Nonzero means place each function into its own section on those platforms 500 which support arbitrary section names and unlimited numbers of sections. */ 501 502extern int flag_function_sections; 503 504/* ... and similar for data. */ 505 506extern int flag_data_sections; 507 508/* -fverbose-asm causes extra commentary information to be produced in 509 the generated assembly code (to make it more readable). This option 510 is generally only of use to those who actually need to read the 511 generated assembly code (perhaps while debugging the compiler itself). 512 -fno-verbose-asm, the default, causes the extra information 513 to not be added and is useful when comparing two assembler files. */ 514 515extern int flag_verbose_asm; 516 517/* -dA causes debug information to be produced in 518 the generated assembly code (to make it more readable). This option 519 is generally only of use to those who actually need to read the 520 generated assembly code (perhaps while debugging the compiler itself). 521 Currently, this switch is only used by dwarfout.c; however, it is intended 522 to be a catchall for printing debug information in the assembler file. */ 523 524extern int flag_debug_asm; 525 526extern int flag_dump_rtl_in_asm; 527 528/* -fgnu-linker specifies use of the GNU linker for initializations. 529 -fno-gnu-linker says that collect will be used. */ 530extern int flag_gnu_linker; 531 532/* Tag all structures with __attribute__(packed) */ 533extern int flag_pack_struct; 534 535/* This flag is only tested if alias checking is enabled. 536 0 if pointer arguments may alias each other. True in C. 537 1 if pointer arguments may not alias each other but may alias 538 global variables. 539 2 if pointer arguments may not alias each other and may not 540 alias global variables. True in Fortran. 541 The value is ignored if flag_alias_check is 0. */ 542extern int flag_argument_noalias; 543 544/* Nonzero if we should do (language-dependent) alias analysis. 545 Typically, this analysis will assume that expressions of certain 546 types do not alias expressions of certain other types. Only used 547 if alias analysis (in general) is enabled. */ 548extern int flag_strict_aliasing; 549 550/* Emit code to probe the stack, to help detect stack overflow; also 551 may cause large objects to be allocated dynamically. */ 552extern int flag_stack_check; 553 554/* Do the full regmove optimization pass. */ 555extern int flag_regmove; 556 557/* Instrument functions with calls at entry and exit, for profiling. */ 558extern int flag_instrument_function_entry_exit; 559 560/* Perform a peephole pass before sched2. */ 561extern int flag_peephole2; 562 563/* Try to guess branch probablities. */ 564extern int flag_guess_branch_prob; 565 566/* -fcheck-bounds causes gcc to generate array bounds checks. 567 For C, C++ and ObjC: defaults off. 568 For Java: defaults to on. 569 For Fortran: defaults to off. */ 570extern int flag_bounds_check; 571 572/* This will attempt to merge constant section constants, if 1 only 573 string constants and constants from constant pool, if 2 also constant 574 variables. */ 575extern int flag_merge_constants; 576 577/* If one, renumber instruction UIDs to reduce the number of 578 unused UIDs if there are a lot of instructions. If greater than 579 one, unconditionally renumber instruction UIDs. */ 580extern int flag_renumber_insns; 581 582/* Other basic status info about current function. */ 583 584/* Nonzero means current function must be given a frame pointer. 585 Set in stmt.c if anything is allocated on the stack there. 586 Set in reload1.c if anything is allocated on the stack there. */ 587 588extern int frame_pointer_needed; 589 590/* Nonzero if the generated code should trap on signed overflow 591 for PLUS / SUB / MULT. */ 592extern int flag_trapv; 593 594/* Value of the -G xx switch, and whether it was passed or not. */ 595extern int g_switch_value; 596extern int g_switch_set; 597 598/* Values of the -falign-* flags: how much to align labels in code. 599 0 means `use default', 1 means `don't align'. 600 For each variable, there is an _log variant which is the power 601 of two not less than the variable, for .align output. */ 602 603extern int align_loops; 604extern int align_loops_log; 605extern int align_loops_max_skip; 606extern int align_jumps; 607extern int align_jumps_log; 608extern int align_jumps_max_skip; 609extern int align_labels; 610extern int align_labels_log; 611extern int align_labels_max_skip; 612extern int align_functions; 613extern int align_functions_log; 614 615/* Like align_functions_log above, but used by front-ends to force the 616 minimum function alignment. Zero means no alignment is forced. */ 617extern int force_align_functions_log; 618 619/* Nonzero if we dump in VCG format, not plain text. */ 620extern int dump_for_graph; 621 622/* Selection of the graph form. */ 623enum graph_dump_types 624{ 625 no_graph = 0, 626 vcg 627}; 628extern enum graph_dump_types graph_dump_format; 629 630/* Nonzero means ignore `#ident' directives. 0 means handle them. 631 On SVR4 targets, it also controls whether or not to emit a 632 string identifying the compiler. */ 633 634extern int flag_no_ident; 635 636/* Nonzero if we want to perform enhanced load motion during gcse. */ 637 638extern int flag_gcse_lm; 639 640/* Nonzero if we want to perform store motion after gcse. */ 641 642extern int flag_gcse_sm; 643 644 645/* Nonzero means we should do dwarf2 duplicate elimination. */ 646 647extern int flag_eliminate_dwarf2_dups; 648 649/* Nonzero means to collect statistics which might be expensive 650 and to print them when we are done. */ 651extern int flag_detailed_statistics; 652 653/* Nonzero means enable synchronous exceptions for non-call instructions. */ 654extern int flag_non_call_exceptions; 655 656/* Nonzero means put zero initialized data in the bss section. */ 657extern int flag_zero_initialized_in_bss; 658 659/* Nonzero means disable transformations observable by signaling NaNs. */ 660extern int flag_signaling_nans; 661 662/* A string that's used when a random name is required. NULL means 663 to make it really random. */ 664 665extern const char *flag_random_seed; 666 667/* True if the given mode has a NaN representation and the treatment of 668 NaN operands is important. Certain optimizations, such as folding 669 x * 0 into x, are not correct for NaN operands, and are normally 670 disabled for modes with NaNs. The user can ask for them to be 671 done anyway using the -funsafe-math-optimizations switch. */ 672#define HONOR_NANS(MODE) \ 673 (MODE_HAS_NANS (MODE) && !flag_finite_math_only) 674 675/* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */ 676#define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE)) 677 678/* As for HONOR_NANS, but true if the mode can represent infinity and 679 the treatment of infinite values is important. */ 680#define HONOR_INFINITIES(MODE) \ 681 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only) 682 683/* Like HONOR_NANS, but true if the given mode distinguishes between 684 postive and negative zero, and the sign of zero is important. */ 685#define HONOR_SIGNED_ZEROS(MODE) \ 686 (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations) 687 688/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, 689 and the rounding mode is important. */ 690#define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \ 691 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && !flag_unsafe_math_optimizations) 692 693#endif /* ! GCC_FLAGS_H */ 694