1 /* Compilation switch flag definitions for GNU CC.
2 Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
25 /* Name of the input .c file being compiled. */
26 extern const char *main_input_filename
;
30 NO_DEBUG
, /* Write no debug info. */
31 DBX_DEBUG
, /* Write BSD .stabs for DBX (using dbxout.c). */
32 SDB_DEBUG
, /* Write COFF for (old) SDB (using sdbout.c). */
33 DWARF_DEBUG
, /* Write Dwarf debug info (using dwarfout.c). */
34 DWARF2_DEBUG
, /* Write Dwarf v2 debug info (using dwarf2out.c). */
35 XCOFF_DEBUG
/* Write IBM/Xcoff debug info (using dbxout.c). */
38 /* Specify which kind of debugging info to generate. */
39 extern enum debug_info_type write_symbols
;
43 DINFO_LEVEL_NONE
, /* Write no debugging info. */
44 DINFO_LEVEL_TERSE
, /* Write minimal info to support tracebacks only. */
45 DINFO_LEVEL_NORMAL
, /* Write info for all declarations (and line table). */
46 DINFO_LEVEL_VERBOSE
/* Write normal info plus #define/#undef info. */
49 /* Specify how much debugging info to generate. */
50 extern enum debug_info_level debug_info_level
;
52 /* Nonzero means use GNU-only extensions in the generated symbolic
53 debugging information. */
54 extern int use_gnu_debug_info_extensions
;
56 /* Nonzero means do optimizations. -opt. */
60 /* Nonzero means optimize for size. -Os. */
62 extern int optimize_size
;
64 /* Don't print functions as they are compiled and don't print
65 times taken by the various passes. -quiet. */
67 extern int quiet_flag
;
69 /* Print times taken by the various passes. -ftime-report. */
71 extern int time_report
;
73 /* Print memory still in use at end of compilation (which may have little
74 to do with peak memory consumption). -fmem-report. */
76 extern int mem_report
;
78 /* Don't print warning messages. -w. */
80 extern int inhibit_warnings
;
82 /* Don't suppress warnings from system headers. -Wsystem-headers. */
84 extern int warn_system_headers
;
86 /* Do print extra warnings (such as for uninitialized variables). -W. */
88 extern int extra_warnings
;
90 /* Nonzero to warn about unused variables, functions et.al. Use
91 set_Wunused() to update the -Wunused-* flags that correspond to the
94 extern void set_Wunused
PARAMS ((int setting
));
96 extern int warn_unused_function
;
97 extern int warn_unused_label
;
98 extern int warn_unused_parameter
;
99 extern int warn_unused_variable
;
100 extern int warn_unused_value
;
102 /* Nonzero to warn about code which is never reached. */
104 extern int warn_notreached
;
106 /* Nonzero means warn if inline function is too large. */
108 extern int warn_inline
;
110 /* Nonzero to warn about variables used before they are initialized. */
112 extern int warn_uninitialized
;
114 /* Zero if unknown pragmas are ignored
115 One if the compiler should warn about an unknown pragma not in
116 a system include file.
117 Greater than one if the compiler should warn for all unknown
120 extern int warn_unknown_pragmas
;
122 /* Nonzero means warn about all declarations which shadow others. */
124 extern int warn_shadow
;
126 /* Warn if a switch on an enum fails to have a case for every enum value. */
128 extern int warn_switch
;
130 /* Nonzero means warn about function definitions that default the return type
131 or that use a null return and have a return-type other than void. */
133 extern int warn_return_type
;
135 /* Warn about functions which might be candidates for attribute noreturn. */
137 extern int warn_missing_noreturn
;
139 /* Nonzero means warn about pointer casts that increase the required
140 alignment of the target type (and might therefore lead to a crash
141 due to a misaligned access). */
143 extern int warn_cast_align
;
145 /* Nonzero means warn about any identifiers that match in the first N
146 characters. The value N is in `id_clash_len'. */
148 extern int warn_id_clash
;
149 extern int id_clash_len
;
151 /* Nonzero means warn about any objects definitions whose size is larger
152 than N bytes. Also want about function definitions whose returned
153 values are larger than N bytes. The value N is in `larger_than_size'. */
155 extern int warn_larger_than
;
156 extern HOST_WIDE_INT larger_than_size
;
158 /* Warn if a function returns an aggregate,
159 since there are often incompatible calling conventions for doing this. */
161 extern int warn_aggregate_return
;
163 /* Warn if packed attribute on struct is unnecessary and inefficient. */
165 extern int warn_packed
;
167 /* Warn when gcc pads a structure to an alignment boundary. */
169 extern int warn_padded
;
171 /* Warn when an optimization pass is disabled. */
173 extern int warn_disabled_optimization
;
175 /* Nonzero if generating code to do profiling. */
177 extern int profile_flag
;
179 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
181 extern int profile_block_flag
;
183 /* Nonzero if generating code to profile program flow graph arcs. */
185 extern int profile_arc_flag
;
187 /* Nonzero if generating info for gcov to calculate line test coverage. */
189 extern int flag_test_coverage
;
191 /* Nonzero indicates that branch taken probabilities should be calculated. */
193 extern int flag_branch_probabilities
;
195 /* Nonzero if basic blocks should be reordered. */
197 extern int flag_reorder_blocks
;
199 /* Nonzero if registers should be renamed. */
201 extern int flag_rename_registers
;
203 /* Nonzero for -pedantic switch: warn about anything
204 that standard C forbids. */
208 /* Temporarily suppress certain warnings.
209 This is set while reading code from a system header file. */
211 extern int in_system_header
;
213 /* Nonzero for -dp: annotate the assembly with a comment describing the
214 pattern and alternative used. */
216 extern int flag_print_asm_name
;
218 /* Now the symbols that are set with `-f' switches. */
220 /* Nonzero means `char' should be signed. */
222 extern int flag_signed_char
;
224 /* Nonzero means give an enum type only as many bytes as it needs. */
226 extern int flag_short_enums
;
228 /* Nonzero for -fcaller-saves: allocate values in regs that need to
229 be saved across function calls, if that produces overall better code.
230 Optional now, so people can test it. */
232 extern int flag_caller_saves
;
234 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
236 extern int flag_pcc_struct_return
;
238 /* Nonzero for -fforce-mem: load memory value into a register
239 before arithmetic on it. This makes better cse but slower compilation. */
241 extern int flag_force_mem
;
243 /* Nonzero for -fforce-addr: load memory address into a register before
244 reference to memory. This makes better cse but slower compilation. */
246 extern int flag_force_addr
;
248 /* Nonzero for -fdefer-pop: don't pop args after each function call;
249 instead save them up to pop many calls' args with one insns. */
251 extern int flag_defer_pop
;
253 /* Nonzero for -ffloat-store: don't allocate floats and doubles
254 in extended-precision registers. */
256 extern int flag_float_store
;
258 /* Nonzero enables strength-reduction in loop.c. */
260 extern int flag_strength_reduce
;
262 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
263 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
264 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
267 extern int flag_unroll_loops
;
269 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
270 This is generally not a win. */
272 extern int flag_unroll_all_loops
;
274 /* Nonzero forces all invariant computations in loops to be moved
277 extern int flag_move_all_movables
;
279 /* Nonzero forces all general induction variables in loops to be
282 extern int flag_reduce_all_givs
;
284 /* Nonzero for -fcse-follow-jumps:
285 have cse follow jumps to do a more extensive job. */
287 extern int flag_cse_follow_jumps
;
289 /* Nonzero for -fcse-skip-blocks:
290 have cse follow a branch around a block. */
292 extern int flag_cse_skip_blocks
;
294 /* Nonzero for -fexpensive-optimizations:
295 perform miscellaneous relatively-expensive optimizations. */
296 extern int flag_expensive_optimizations
;
298 /* Nonzero for -fwritable-strings:
299 store string constants in data segment and don't uniquize them. */
301 extern int flag_writable_strings
;
303 /* Nonzero means don't put addresses of constant functions in registers.
304 Used for compiling the Unix kernel, where strange substitutions are
305 done on the assembly output. */
307 extern int flag_no_function_cse
;
309 /* Nonzero for -fomit-frame-pointer:
310 don't make a frame pointer in simple functions that don't require one. */
312 extern int flag_omit_frame_pointer
;
314 /* Nonzero to inhibit use of define_optimization peephole opts. */
316 extern int flag_no_peephole
;
318 /* Nonzero means all references through pointers are volatile. */
320 extern int flag_volatile
;
322 /* Nonzero means treat all global and extern variables as volatile. */
324 extern int flag_volatile_global
;
326 /* Nonzero means treat all static variables as volatile. */
328 extern int flag_volatile_static
;
330 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
332 extern int flag_optimize_sibling_calls
;
334 /* Nonzero means the front end generally wants `errno' maintained by math
335 operations, like built-in SQRT. */
337 extern int flag_errno_math
;
339 /* Nonzero means that unsafe floating-point math optimizations are allowed
340 for the sake of speed. IEEE compliance is not guaranteed, and operations
341 are allowed to assume that their arguments and results are "normal"
342 (e.g., nonnegative for SQRT). */
344 extern int flag_unsafe_math_optimizations
;
346 /* Zero means that floating-point math operations cannot generate a
347 (user-visible) trap. This is the case, for example, in nonstop
348 IEEE 754 arithmetic. */
350 extern int flag_trapping_math
;
352 /* 0 means straightforward implementation of complex divide acceptable.
353 1 means wide ranges of inputs must work for complex divide.
354 2 means C99-like requirements for complex divide (not yet implemented). */
356 extern int flag_complex_divide_method
;
358 /* Nonzero means to run loop optimizations twice. */
360 extern int flag_rerun_loop_opt
;
362 /* Nonzero means make functions that look like good inline candidates
365 extern int flag_inline_functions
;
367 /* Nonzero for -fkeep-inline-functions: even if we make a function
368 go inline everywhere, keep its definition around for debugging
371 extern int flag_keep_inline_functions
;
373 /* Nonzero means that functions declared `inline' will be treated
374 as `static'. Prevents generation of zillions of copies of unused
375 static inline functions; instead, `inlines' are written out
376 only when actually used. Used in conjunction with -g. Also
377 does the right thing with #pragma interface. */
379 extern int flag_no_inline
;
381 /* Nonzero if we are only using compiler to check syntax errors. */
383 extern int flag_syntax_only
;
385 /* Nonzero means we should save auxiliary info into a .X file. */
387 extern int flag_gen_aux_info
;
389 /* Nonzero means make the text shared if supported. */
391 extern int flag_shared_data
;
393 /* flag_schedule_insns means schedule insns within basic blocks (before
395 flag_schedule_insns_after_reload means schedule insns after
398 extern int flag_schedule_insns
;
399 extern int flag_schedule_insns_after_reload
;
401 /* The following flags have effect only for scheduling before register
404 flag_schedule_interblock means schedule insns accross basic blocks.
405 flag_schedule_speculative means allow speculative motion of non-load insns.
406 flag_schedule_speculative_load means allow speculative motion of some
408 flag_schedule_speculative_load_dangerous allows speculative motion of more
411 extern int flag_schedule_interblock
;
412 extern int flag_schedule_speculative
;
413 extern int flag_schedule_speculative_load
;
414 extern int flag_schedule_speculative_load_dangerous
;
416 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
417 by a cheaper branch, on a count register. */
418 extern int flag_branch_on_count_reg
;
420 /* This option is set to 1 on -fsingle-precision-constant option which is
421 used to convert the floating point constants to single precision
424 extern int flag_single_precision_constant
;
426 /* Nonzero means put things in delayed-branch slots if supported. */
428 extern int flag_delayed_branch
;
430 /* Nonzero means suppress output of instruction numbers and line number
431 notes in debugging dumps. */
433 extern int flag_dump_unnumbered
;
435 /* Nonzero means pretend it is OK to examine bits of target floats,
436 even if that isn't true. The resulting code will have incorrect constants,
437 but the same series of instructions that the native compiler would make. */
439 extern int flag_pretend_float
;
441 /* Nonzero means change certain warnings into errors.
442 Usually these are warnings about failure to conform to some standard. */
444 extern int flag_pedantic_errors
;
446 /* Nonzero means generate position-independent code.
447 This is not fully implemented yet. */
451 /* Nonzero means generate extra code for exception handling and enable
452 exception handling. */
454 extern int flag_exceptions
;
456 /* Nonzero means use the new model for exception handling. Replaces
457 -DNEW_EH_MODEL as a compile option. */
459 extern int flag_new_exceptions
;
461 /* Nonzero means generate frame unwind info table when supported */
463 extern int flag_unwind_tables
;
465 /* Nonzero means don't place uninitialized global data in common storage
468 extern int flag_no_common
;
470 /* -finhibit-size-directive inhibits output of .size for ELF.
471 This is used only for compiling crtstuff.c,
472 and it may be extended to other effects
473 needed for crtstuff.c on other systems. */
474 extern int flag_inhibit_size_directive
;
476 /* Nonzero means place each function into its own section on those platforms
477 which support arbitrary section names and unlimited numbers of sections. */
479 extern int flag_function_sections
;
481 /* ... and similar for data. */
483 extern int flag_data_sections
;
485 /* -fverbose-asm causes extra commentary information to be produced in
486 the generated assembly code (to make it more readable). This option
487 is generally only of use to those who actually need to read the
488 generated assembly code (perhaps while debugging the compiler itself).
489 -fno-verbose-asm, the default, causes the extra information
490 to not be added and is useful when comparing two assembler files. */
492 extern int flag_verbose_asm
;
494 /* -dA causes debug information to be produced in
495 the generated assembly code (to make it more readable). This option
496 is generally only of use to those who actually need to read the
497 generated assembly code (perhaps while debugging the compiler itself).
498 Currently, this switch is only used by dwarfout.c; however, it is intended
499 to be a catchall for printing debug information in the assembler file. */
501 extern int flag_debug_asm
;
503 extern int flag_dump_rtl_in_asm
;
505 /* -fgnu-linker specifies use of the GNU linker for initializations.
506 -fno-gnu-linker says that collect will be used. */
507 extern int flag_gnu_linker
;
509 /* Tag all structures with __attribute__(packed) */
510 extern int flag_pack_struct
;
512 /* This flag is only tested if alias checking is enabled.
513 0 if pointer arguments may alias each other. True in C.
514 1 if pointer arguments may not alias each other but may alias
516 2 if pointer arguments may not alias each other and may not
517 alias global variables. True in Fortran.
518 The value is ignored if flag_alias_check is 0. */
519 extern int flag_argument_noalias
;
521 /* Nonzero if we should do (language-dependent) alias analysis.
522 Typically, this analysis will assume that expressions of certain
523 types do not alias expressions of certain other types. Only used
524 if alias analysis (in general) is enabled. */
525 extern int flag_strict_aliasing
;
527 /* Emit code to probe the stack, to help detect stack overflow; also
528 may cause large objects to be allocated dynamically. */
529 extern int flag_stack_check
;
531 /* Do the full regmove optimization pass. */
532 extern int flag_regmove
;
534 /* Instrument functions with calls at entry and exit, for profiling. */
535 extern int flag_instrument_function_entry_exit
;
537 /* Perform a peephole pass before sched2. */
538 extern int flag_peephole2
;
540 /* Try to guess branch probablities. */
541 extern int flag_guess_branch_prob
;
543 /* -fbounded-pointers causes gcc to compile pointers as composite
544 objects occupying three words: the pointer value, the base address
545 of the referent object, and the address immediately beyond the end
546 of the referent object. The base and extent allow us to perform
547 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
548 extern int flag_bounded_pointers
;
550 /* -fcheck-bounds causes gcc to generate array bounds checks.
551 For C, C++: defaults to value of flag_bounded_pointers.
552 For ObjC: defaults to off.
553 For Java: defaults to on.
554 For Fortran: defaults to off.
555 For CHILL: defaults to off. */
556 extern int flag_bounds_check
;
558 /* If one, renumber instruction UIDs to reduce the number of
559 unused UIDs if there are a lot of instructions. If greater than
560 one, unconditionally renumber instruction UIDs. */
561 extern int flag_renumber_insns
;
563 /* Other basic status info about current function. */
565 /* Nonzero means current function must be given a frame pointer.
566 Set in stmt.c if anything is allocated on the stack there.
567 Set in reload1.c if anything is allocated on the stack there. */
569 extern int frame_pointer_needed
;
571 /* Nonzero if GCC must add code to check memory access (used by Checker). */
573 extern int flag_check_memory_usage
;
575 /* Nonzero if the generated code should trap on signed overflow
576 for PLUS / SUB / MULT. */
577 extern int flag_trapv
;
579 /* Nonzero if GCC must prefix function names (used with
580 flag_check_memory_usage). */
582 extern int flag_prefix_function_name
;
584 /* Value of the -G xx switch, and whether it was passed or not. */
585 extern int g_switch_value
;
586 extern int g_switch_set
;
588 /* Values of the -falign-* flags: how much to align labels in code.
589 0 means `use default', 1 means `don't align'.
590 For each variable, there is an _log variant which is the power
591 of two not less than the variable, for .align output. */
593 extern int align_loops
;
594 extern int align_loops_log
;
595 extern int align_jumps
;
596 extern int align_jumps_log
;
597 extern int align_labels
;
598 extern int align_labels_log
;
599 extern int align_functions
;
600 extern int align_functions_log
;
602 /* Nonzero if we dump in VCG format, not plain text. */
603 extern int dump_for_graph
;
605 /* Selection of the graph form. */
606 enum graph_dump_types
611 extern enum graph_dump_types graph_dump_format
;
613 /* Nonzero means ignore `#ident' directives. 0 means handle them.
614 On SVR4 targets, it also controls whether or not to emit a
615 string identifying the compiler. */
617 extern int flag_no_ident
;
619 /* Nonzero means we should do dwarf2 duplicate elimination. */
621 extern int flag_eliminate_dwarf2_dups
;
623 /* Non-zero means to collect statistics which might be expensive
624 and to print them when we are done. */
625 extern int flag_detailed_statistics
;
627 #endif /* GCC_FLAGS_H */