1 /* Compilation switch flag definitions for GCC.
2 Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
28 NO_DEBUG
, /* Write no debug info. */
29 DBX_DEBUG
, /* Write BSD .stabs for DBX (using dbxout.c). */
30 SDB_DEBUG
, /* Write COFF for (old) SDB (using sdbout.c). */
31 DWARF_DEBUG
, /* Write Dwarf debug info (using dwarfout.c). */
32 DWARF2_DEBUG
, /* Write Dwarf v2 debug info (using dwarf2out.c). */
33 XCOFF_DEBUG
, /* Write IBM/Xcoff debug info (using dbxout.c). */
34 VMS_DEBUG
, /* Write VMS debug info (using vmsdbgout.c). */
35 VMS_AND_DWARF2_DEBUG
/* Write VMS debug info (using vmsdbgout.c).
36 and DWARF v2 debug info (using dwarf2out.c). */
39 /* Specify which kind of debugging info to generate. */
40 extern enum debug_info_type write_symbols
;
42 /* Names of debug_info_type, for error messages. */
43 extern const char *const debug_type_names
[];
47 DINFO_LEVEL_NONE
, /* Write no debugging info. */
48 DINFO_LEVEL_TERSE
, /* Write minimal info to support tracebacks only. */
49 DINFO_LEVEL_NORMAL
, /* Write info for all declarations (and line table). */
50 DINFO_LEVEL_VERBOSE
/* Write normal info plus #define/#undef info. */
53 /* Specify how much debugging info to generate. */
54 extern enum debug_info_level debug_info_level
;
56 /* Nonzero means use GNU-only extensions in the generated symbolic
57 debugging information. */
58 extern bool use_gnu_debug_info_extensions
;
60 /* Nonzero means emit debugging information only for symbols which are used. */
61 extern int flag_debug_only_used_symbols
;
63 /* Nonzero means do optimizations. -opt. */
67 /* Nonzero means optimize for size. -Os. */
69 extern int optimize_size
;
71 /* Don't print functions as they are compiled and don't print
72 times taken by the various passes. -quiet. */
74 extern int quiet_flag
;
76 /* Print memory still in use at end of compilation (which may have little
77 to do with peak memory consumption). -fmem-report. */
79 extern int mem_report
;
81 /* Don't print warning messages. -w. */
83 extern bool inhibit_warnings
;
85 /* Don't suppress warnings from system headers. -Wsystem-headers. */
87 extern bool warn_system_headers
;
89 /* Do print extra warnings (such as for uninitialized variables).
92 extern bool extra_warnings
;
96 extern bool warnings_are_errors
;
98 /* Nonzero to warn about unused variables, functions et.al. Use
99 set_Wunused() to update the -Wunused-* flags that correspond to the
102 extern void set_Wunused (int setting
);
104 extern bool warn_unused_function
;
105 extern bool warn_unused_label
;
106 extern bool warn_unused_parameter
;
107 extern bool warn_unused_variable
;
108 extern bool warn_unused_value
;
110 /* Nonzero to warn about code which is never reached. */
112 extern bool warn_notreached
;
114 /* Nonzero means warn if inline function is too large. */
116 extern bool warn_inline
;
118 /* Nonzero to warn about variables used before they are initialized. */
120 extern int warn_uninitialized
;
122 /* Nonzero means warn about all declarations which shadow others. */
124 extern bool warn_shadow
;
126 /* Warn if a switch on an enum, that does not have a default case,
127 fails to have a case for every enum value. */
129 extern bool warn_switch
;
131 /* Warn if a switch does not have a default case. */
133 extern bool warn_switch_default
;
135 /* Warn if a switch on an enum fails to have a case for every enum
136 value (regardless of the presence or otherwise of a default case). */
138 extern bool warn_switch_enum
;
140 /* Nonzero means warn about function definitions that default the return type
141 or that use a null return and have a return-type other than void. */
143 extern int warn_return_type
;
145 /* Warn about functions which might be candidates for attribute noreturn. */
147 extern bool warn_missing_noreturn
;
149 /* Nonzero means warn about pointer casts that increase the required
150 alignment of the target type (and might therefore lead to a crash
151 due to a misaligned access). */
153 extern bool warn_cast_align
;
155 /* Nonzero means warn about any objects definitions whose size is larger
156 than N bytes. Also want about function definitions whose returned
157 values are larger than N bytes. The value N is in `larger_than_size'. */
159 extern bool warn_larger_than
;
160 extern HOST_WIDE_INT larger_than_size
;
162 /* Warn if a function returns an aggregate,
163 since there are often incompatible calling conventions for doing this. */
165 extern bool warn_aggregate_return
;
167 /* Warn if packed attribute on struct is unnecessary and inefficient. */
169 extern bool warn_packed
;
171 /* Warn when gcc pads a structure to an alignment boundary. */
173 extern bool warn_padded
;
175 /* Warn when an optimization pass is disabled. */
177 extern bool warn_disabled_optimization
;
179 /* Nonzero means warn about uses of __attribute__((deprecated))
182 extern bool warn_deprecated_decl
;
184 /* Nonzero means warn about constructs which might not be strict
187 extern int warn_strict_aliasing
;
189 /* Nonzero if generating code to do profiling. */
191 extern int profile_flag
;
193 /* Nonzero if generating code to profile program flow graph arcs. */
195 extern int profile_arc_flag
;
197 /* Nonzero if value profile should be measured. */
199 extern int flag_profile_values
;
201 /* Nonzero if generating info for gcov to calculate line test coverage. */
203 extern int flag_test_coverage
;
205 /* Nonzero indicates that branch taken probabilities should be calculated. */
207 extern int flag_branch_probabilities
;
209 /* Nonzero if basic blocks should be reordered. */
211 extern int flag_reorder_blocks
;
213 /* Nonzero if basic blocks should be partitioned into hot and cold
214 sections of the .o file, in addition to being reordered. */
216 extern int flag_reorder_blocks_and_partition
;
218 /* Nonzero if functions should be reordered. */
220 extern int flag_reorder_functions
;
222 /* Nonzero if registers should be renamed. */
224 extern int flag_rename_registers
;
226 /* Nonzero for -pedantic switch: warn about anything
227 that standard C forbids. */
231 /* Temporarily suppress certain warnings.
232 This is set while reading code from a system header file. */
234 extern int in_system_header
;
236 /* Nonzero for -dp: annotate the assembly with a comment describing the
237 pattern and alternative used. */
239 extern int flag_print_asm_name
;
241 /* Now the symbols that are set with `-f' switches. */
243 /* Nonzero means `char' should be signed. */
245 extern int flag_signed_char
;
247 /* Nonzero means give an enum type only as many bytes as it needs. A value
248 of 2 means it has not yet been initialized. */
250 extern int flag_short_enums
;
252 /* Nonzero for -fcaller-saves: allocate values in regs that need to
253 be saved across function calls, if that produces overall better code.
254 Optional now, so people can test it. */
256 extern int flag_caller_saves
;
258 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
260 extern int flag_pcc_struct_return
;
262 /* Nonzero for -fforce-mem: load memory value into a register
263 before arithmetic on it. This makes better cse but slower compilation. */
265 extern int flag_force_mem
;
267 /* Nonzero for -fforce-addr: load memory address into a register before
268 reference to memory. This makes better cse but slower compilation. */
270 extern int flag_force_addr
;
272 /* Nonzero for -fdefer-pop: don't pop args after each function call;
273 instead save them up to pop many calls' args with one insns. */
275 extern int flag_defer_pop
;
277 /* Nonzero for -ffloat-store: don't allocate floats and doubles
278 in extended-precision registers. */
280 extern int flag_float_store
;
282 /* Nonzero enables strength-reduction in loop.c. */
284 extern int flag_strength_reduce
;
286 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
287 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
288 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
291 extern int flag_old_unroll_loops
;
293 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
294 This is generally not a win. */
296 extern int flag_old_unroll_all_loops
;
298 /* Nonzero forces all invariant computations in loops to be moved
301 extern int flag_move_all_movables
;
303 /* Nonzero enables prefetch optimizations for arrays in loops. */
305 extern int flag_prefetch_loop_arrays
;
307 /* Nonzero forces all general induction variables in loops to be
310 extern int flag_reduce_all_givs
;
312 /* Nonzero for -fcse-follow-jumps:
313 have cse follow jumps to do a more extensive job. */
315 extern int flag_cse_follow_jumps
;
317 /* Nonzero for -fcse-skip-blocks:
318 have cse follow a branch around a block. */
320 extern int flag_cse_skip_blocks
;
322 /* Nonzero for -fexpensive-optimizations:
323 perform miscellaneous relatively-expensive optimizations. */
324 extern int flag_expensive_optimizations
;
326 /* Nonzero means don't put addresses of constant functions in registers.
327 Used for compiling the Unix kernel, where strange substitutions are
328 done on the assembly output. */
330 extern int flag_no_function_cse
;
332 /* Nonzero for -fomit-frame-pointer:
333 don't make a frame pointer in simple functions that don't require one. */
335 extern int flag_omit_frame_pointer
;
337 /* Nonzero to inhibit use of define_optimization peephole opts. */
339 extern int flag_no_peephole
;
341 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
343 extern int flag_optimize_sibling_calls
;
345 /* Nonzero means the front end generally wants `errno' maintained by math
346 operations, like built-in SQRT. */
348 extern int flag_errno_math
;
350 /* Nonzero means that unsafe floating-point math optimizations are allowed
351 for the sake of speed. IEEE compliance is not guaranteed, and operations
352 are allowed to assume that their arguments and results are "normal"
353 (e.g., nonnegative for SQRT). */
355 extern int flag_unsafe_math_optimizations
;
357 /* Nonzero means that no NaNs or +-Infs are expected. */
359 extern int flag_finite_math_only
;
361 /* Zero means that floating-point math operations cannot generate a
362 (user-visible) trap. This is the case, for example, in nonstop
363 IEEE 754 arithmetic. */
365 extern int flag_trapping_math
;
367 /* Nonzero means disable transformations that assume default floating
368 point rounding behavior. */
370 extern int flag_rounding_math
;
372 /* 0 means straightforward implementation of complex divide acceptable.
373 1 means wide ranges of inputs must work for complex divide.
374 2 means C99-like requirements for complex divide (not yet implemented). */
376 extern int flag_complex_divide_method
;
378 /* Nonzero means to run loop optimizations twice. */
380 extern int flag_rerun_loop_opt
;
382 /* Nonzero means make functions that look like good inline candidates
385 extern int flag_inline_functions
;
387 /* Nonzero for -fkeep-inline-functions: even if we make a function
388 go inline everywhere, keep its definition around for debugging
391 extern int flag_keep_inline_functions
;
393 /* Nonzero means that functions declared `inline' will be treated
394 as `static'. Prevents generation of zillions of copies of unused
395 static inline functions; instead, `inlines' are written out
396 only when actually used. Used in conjunction with -g. Also
397 does the right thing with #pragma interface. */
399 extern int flag_no_inline
;
401 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
402 not just because the tree inliner turned us off. */
404 extern int flag_really_no_inline
;
406 /* Nonzero if we are only using compiler to check syntax errors. */
408 extern int flag_syntax_only
;
409 extern int rtl_dump_and_exit
;
411 /* Nonzero if we are exiting on the first error occurred. */
413 extern int flag_fatal_errors
;
415 /* Nonzero means we should save auxiliary info into a .X file. */
417 extern int flag_gen_aux_info
;
419 /* Nonzero means make the text shared if supported. */
421 extern int flag_shared_data
;
423 /* flag_schedule_insns means schedule insns within basic blocks (before
425 flag_schedule_insns_after_reload means schedule insns after
428 extern int flag_schedule_insns
;
429 extern int flag_schedule_insns_after_reload
;
430 extern int flag_sched2_use_superblocks
;
431 extern int flag_sched2_use_traces
;
433 /* The following flags have effect only for scheduling before register
436 flag_schedule_interblock means schedule insns across basic blocks.
437 flag_schedule_speculative means allow speculative motion of non-load insns.
438 flag_schedule_speculative_load means allow speculative motion of some
440 flag_schedule_speculative_load_dangerous allows speculative motion of more
443 extern int flag_schedule_interblock
;
444 extern int flag_schedule_speculative
;
445 extern int flag_schedule_speculative_load
;
446 extern int flag_schedule_speculative_load_dangerous
;
448 /* The following flags have an effect during scheduling after register
451 sched_stalled_insns means that insns can be moved prematurely from the queue
452 of stalled insns into the ready list.
454 sched_stalled_insns_dep controls how many recently scheduled cycles will
455 be examined for a dependency on a stalled insn that is candidate for
456 premature removal from the queue of stalled insns into the ready list (has
457 an effect only if the flag 'sched_stalled_insns' is set). */
459 extern int flag_sched_stalled_insns
;
460 extern int flag_sched_stalled_insns_dep
;
462 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
463 by a cheaper branch, on a count register. */
464 extern int flag_branch_on_count_reg
;
466 /* This option is set to 1 on -fsingle-precision-constant option which is
467 used to convert the floating point constants to single precision
470 extern int flag_single_precision_constant
;
472 /* Nonzero means put things in delayed-branch slots if supported. */
474 extern int flag_delayed_branch
;
476 /* Nonzero means suppress output of instruction numbers and line number
477 notes in debugging dumps. */
479 extern int flag_dump_unnumbered
;
481 /* Nonzero means change certain warnings into errors.
482 Usually these are warnings about failure to conform to some standard. */
484 extern int flag_pedantic_errors
;
486 /* Nonzero means generate position-independent code. 1 vs 2 for a
487 target-dependent "small" or "large" mode. */
491 /* Nonzero if we are compiling position independent code for executable.
492 1 vs 2 for a target-dependent "small" or "large" mode. */
496 /* Nonzero if we are compiling code for a shared library, zero for
499 extern int flag_shlib
;
501 /* Nonzero means generate extra code for exception handling and enable
502 exception handling. */
504 extern int flag_exceptions
;
506 /* Nonzero means generate frame unwind info table when supported. */
508 extern int flag_unwind_tables
;
510 /* Nonzero means generate frame unwind info table exact at each insn boundary. */
512 extern int flag_asynchronous_unwind_tables
;
514 /* Nonzero means don't place uninitialized global data in common storage
517 extern int flag_no_common
;
519 /* -finhibit-size-directive inhibits output of .size for ELF.
520 This is used only for compiling crtstuff.c,
521 and it may be extended to other effects
522 needed for crtstuff.c on other systems. */
523 extern int flag_inhibit_size_directive
;
525 /* Nonzero means place each function into its own section on those platforms
526 which support arbitrary section names and unlimited numbers of sections. */
528 extern int flag_function_sections
;
530 /* ... and similar for data. */
532 extern int flag_data_sections
;
534 /* -fverbose-asm causes extra commentary information to be produced in
535 the generated assembly code (to make it more readable). This option
536 is generally only of use to those who actually need to read the
537 generated assembly code (perhaps while debugging the compiler itself).
538 -fno-verbose-asm, the default, causes the extra information
539 to not be added and is useful when comparing two assembler files. */
541 extern int flag_verbose_asm
;
543 /* -dA causes debug information to be produced in
544 the generated assembly code (to make it more readable). This option
545 is generally only of use to those who actually need to read the
546 generated assembly code (perhaps while debugging the compiler itself).
547 Currently, this switch is only used by dwarfout.c; however, it is intended
548 to be a catchall for printing debug information in the assembler file. */
550 extern int flag_debug_asm
;
552 extern int flag_dump_rtl_in_asm
;
554 /* Greater than zero if user symbols are prepended by a leading underscore
555 in generated assembly code. */
556 extern int flag_leading_underscore
;
558 /* Tag all structures with __attribute__(packed) */
559 extern int flag_pack_struct
;
561 /* This flag is only tested if alias checking is enabled.
562 0 if pointer arguments may alias each other. True in C.
563 1 if pointer arguments may not alias each other but may alias
565 2 if pointer arguments may not alias each other and may not
566 alias global variables. True in Fortran.
567 The value is ignored if flag_alias_check is 0. */
568 extern int flag_argument_noalias
;
570 /* Nonzero if we should do (language-dependent) alias analysis.
571 Typically, this analysis will assume that expressions of certain
572 types do not alias expressions of certain other types. Only used
573 if alias analysis (in general) is enabled. */
574 extern int flag_strict_aliasing
;
576 /* Emit code to probe the stack, to help detect stack overflow; also
577 may cause large objects to be allocated dynamically. */
578 extern int flag_stack_check
;
580 /* Do the full regmove optimization pass. */
581 extern int flag_regmove
;
583 /* Instrument functions with calls at entry and exit, for profiling. */
584 extern int flag_instrument_function_entry_exit
;
586 /* Perform a peephole pass before sched2. */
587 extern int flag_peephole2
;
589 /* Try to guess branch probabilities. */
590 extern int flag_guess_branch_prob
;
592 /* -fcheck-bounds causes gcc to generate array bounds checks.
593 For C, C++ and ObjC: defaults off.
594 For Java: defaults to on.
595 For Fortran: defaults to off. */
596 extern int flag_bounds_check
;
598 /* This will attempt to merge constant section constants, if 1 only
599 string constants and constants from constant pool, if 2 also constant
601 extern int flag_merge_constants
;
603 /* If one, renumber instruction UIDs to reduce the number of
604 unused UIDs if there are a lot of instructions. If greater than
605 one, unconditionally renumber instruction UIDs. */
606 extern int flag_renumber_insns
;
608 /* Other basic status info about current function. */
610 /* Nonzero means current function must be given a frame pointer.
611 Set in stmt.c if anything is allocated on the stack there.
612 Set in reload1.c if anything is allocated on the stack there. */
614 extern int frame_pointer_needed
;
616 /* Nonzero if the generated code should trap on signed overflow
617 for PLUS / SUB / MULT. */
618 extern int flag_trapv
;
620 /* Nonzero if the signed arithmetic overflow should wrap around. */
621 extern int flag_wrapv
;
623 /* Nonzero if subexpressions must be evaluated from left-to-right. */
624 extern int flag_evaluation_order
;
626 /* Value of the -G xx switch, and whether it was passed or not. */
627 extern unsigned HOST_WIDE_INT g_switch_value
;
628 extern bool g_switch_set
;
630 /* Values of the -falign-* flags: how much to align labels in code.
631 0 means `use default', 1 means `don't align'.
632 For each variable, there is an _log variant which is the power
633 of two not less than the variable, for .align output. */
635 extern int align_loops
;
636 extern int align_loops_log
;
637 extern int align_loops_max_skip
;
638 extern int align_jumps
;
639 extern int align_jumps_log
;
640 extern int align_jumps_max_skip
;
641 extern int align_labels
;
642 extern int align_labels_log
;
643 extern int align_labels_max_skip
;
644 extern int align_functions
;
645 extern int align_functions_log
;
647 /* Like align_functions_log above, but used by front-ends to force the
648 minimum function alignment. Zero means no alignment is forced. */
649 extern int force_align_functions_log
;
651 /* Nonzero if we dump in VCG format, not plain text. */
652 extern int dump_for_graph
;
654 /* Selection of the graph form. */
655 enum graph_dump_types
660 extern enum graph_dump_types graph_dump_format
;
662 /* Nonzero means ignore `#ident' directives. 0 means handle them.
663 On SVR4 targets, it also controls whether or not to emit a
664 string identifying the compiler. */
666 extern int flag_no_ident
;
668 /* Nonzero means perform global CSE. */
670 extern int flag_gcse
;
672 /* Nonzero if we want to perform enhanced load motion during gcse. */
674 extern int flag_gcse_lm
;
676 /* Nonzero if we want to perform store motion after gcse. */
678 extern int flag_gcse_sm
;
680 /* Nonzero if we want to perform redundant load-after-store elimination
683 extern int flag_gcse_las
;
685 /* Nonzero if we want to perform global redundancy elimination after
686 register allocation. */
688 extern int flag_gcse_after_reload
;
690 /* Nonzero if value histograms should be used to optimize code. */
691 extern int flag_value_profile_transformations
;
693 /* Perform branch target register optimization before prologue / epilogue
696 extern int flag_branch_target_load_optimize
;
698 /* Perform branch target register optimization after prologue / epilogue
699 threading and jump2. */
701 extern int flag_branch_target_load_optimize2
;
703 /* For the bt-load pass, nonzero means don't re-use branch target registers
704 in any basic block. */
705 extern int flag_btr_bb_exclusive
;
708 /* Nonzero means we should do dwarf2 duplicate elimination. */
710 extern int flag_eliminate_dwarf2_dups
;
712 /* Nonzero means we should do unused type elimination. */
714 extern int flag_eliminate_unused_debug_types
;
716 /* Nonzero means to collect statistics which might be expensive
717 and to print them when we are done. */
718 extern int flag_detailed_statistics
;
720 /* Nonzero means enable synchronous exceptions for non-call instructions. */
721 extern int flag_non_call_exceptions
;
723 /* Nonzero means put zero initialized data in the bss section. */
724 extern int flag_zero_initialized_in_bss
;
726 /* Nonzero means disable transformations observable by signaling NaNs. */
727 extern int flag_signaling_nans
;
729 extern int flag_unit_at_a_time
;
733 /* Nonzero means that we defer emitting functions until they are actually
735 extern int flag_remove_unreachable_functions
;
737 /* Nonzero if we should track variables. */
738 extern int flag_var_tracking
;
740 /* A string that's used when a random name is required. NULL means
741 to make it really random. */
743 extern const char *flag_random_seed
;
745 /* The version of the C++ ABI in use. The following values are
748 0: The version of the ABI believed most conformant with the
749 C++ ABI specification. This ABI may change as bugs are
750 discovered and fixed. Therefore, 0 will not necessarily
751 indicate the same ABI in different versions of G++.
753 1: The version of the ABI first used in G++ 3.2.
755 Additional positive integers will be assigned as new versions of
756 the ABI become the default version of the ABI. */
758 extern int flag_abi_version
;
760 /* Returns TRUE if generated code should match ABI version N or
761 greater is in use. */
763 #define abi_version_at_least(N) \
764 (flag_abi_version == 0 || flag_abi_version >= (N))
766 /* True if the given mode has a NaN representation and the treatment of
767 NaN operands is important. Certain optimizations, such as folding
768 x * 0 into x, are not correct for NaN operands, and are normally
769 disabled for modes with NaNs. The user can ask for them to be
770 done anyway using the -funsafe-math-optimizations switch. */
771 #define HONOR_NANS(MODE) \
772 (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
774 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */
775 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
777 /* As for HONOR_NANS, but true if the mode can represent infinity and
778 the treatment of infinite values is important. */
779 #define HONOR_INFINITIES(MODE) \
780 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
782 /* Like HONOR_NANS, but true if the given mode distinguishes between
783 positive and negative zero, and the sign of zero is important. */
784 #define HONOR_SIGNED_ZEROS(MODE) \
785 (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations)
787 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
788 and the rounding mode is important. */
789 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
790 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
792 #endif /* ! GCC_FLAGS_H */