1 /* Compilation switch flag definitions for GCC.
2 Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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 objects definitions whose size is larger
146 than N bytes. Also want about function definitions whose returned
147 values are larger than N bytes. The value N is in `larger_than_size'. */
149 extern int warn_larger_than
;
150 extern HOST_WIDE_INT larger_than_size
;
152 /* Warn if a function returns an aggregate,
153 since there are often incompatible calling conventions for doing this. */
155 extern int warn_aggregate_return
;
157 /* Warn if packed attribute on struct is unnecessary and inefficient. */
159 extern int warn_packed
;
161 /* Warn when gcc pads a structure to an alignment boundary. */
163 extern int warn_padded
;
165 /* Warn when an optimization pass is disabled. */
167 extern int warn_disabled_optimization
;
169 /* Nonzero if generating code to do profiling. */
171 extern int profile_flag
;
173 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
175 extern int profile_block_flag
;
177 /* Nonzero if generating code to profile program flow graph arcs. */
179 extern int profile_arc_flag
;
181 /* Nonzero if generating info for gcov to calculate line test coverage. */
183 extern int flag_test_coverage
;
185 /* Nonzero indicates that branch taken probabilities should be calculated. */
187 extern int flag_branch_probabilities
;
189 /* Nonzero if basic blocks should be reordered. */
191 extern int flag_reorder_blocks
;
193 /* Nonzero if registers should be renamed. */
195 extern int flag_rename_registers
;
197 /* Nonzero for -pedantic switch: warn about anything
198 that standard C forbids. */
202 /* Temporarily suppress certain warnings.
203 This is set while reading code from a system header file. */
205 extern int in_system_header
;
207 /* Nonzero for -dp: annotate the assembly with a comment describing the
208 pattern and alternative used. */
210 extern int flag_print_asm_name
;
212 /* Now the symbols that are set with `-f' switches. */
214 /* Nonzero means `char' should be signed. */
216 extern int flag_signed_char
;
218 /* Nonzero means give an enum type only as many bytes as it needs. */
220 extern int flag_short_enums
;
222 /* Nonzero for -fcaller-saves: allocate values in regs that need to
223 be saved across function calls, if that produces overall better code.
224 Optional now, so people can test it. */
226 extern int flag_caller_saves
;
228 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
230 extern int flag_pcc_struct_return
;
232 /* Nonzero for -fforce-mem: load memory value into a register
233 before arithmetic on it. This makes better cse but slower compilation. */
235 extern int flag_force_mem
;
237 /* Nonzero for -fforce-addr: load memory address into a register before
238 reference to memory. This makes better cse but slower compilation. */
240 extern int flag_force_addr
;
242 /* Nonzero for -fdefer-pop: don't pop args after each function call;
243 instead save them up to pop many calls' args with one insns. */
245 extern int flag_defer_pop
;
247 /* Nonzero for -ffloat-store: don't allocate floats and doubles
248 in extended-precision registers. */
250 extern int flag_float_store
;
252 /* Nonzero enables strength-reduction in loop.c. */
254 extern int flag_strength_reduce
;
256 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
257 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
258 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
261 extern int flag_unroll_loops
;
263 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
264 This is generally not a win. */
266 extern int flag_unroll_all_loops
;
268 /* Nonzero forces all invariant computations in loops to be moved
271 extern int flag_move_all_movables
;
273 /* Nonzero forces all general induction variables in loops to be
276 extern int flag_reduce_all_givs
;
278 /* Nonzero for -fcse-follow-jumps:
279 have cse follow jumps to do a more extensive job. */
281 extern int flag_cse_follow_jumps
;
283 /* Nonzero for -fcse-skip-blocks:
284 have cse follow a branch around a block. */
286 extern int flag_cse_skip_blocks
;
288 /* Nonzero for -fexpensive-optimizations:
289 perform miscellaneous relatively-expensive optimizations. */
290 extern int flag_expensive_optimizations
;
292 /* Nonzero for -fwritable-strings:
293 store string constants in data segment and don't uniquize them. */
295 extern int flag_writable_strings
;
297 /* Nonzero means don't put addresses of constant functions in registers.
298 Used for compiling the Unix kernel, where strange substitutions are
299 done on the assembly output. */
301 extern int flag_no_function_cse
;
303 /* Nonzero for -fomit-frame-pointer:
304 don't make a frame pointer in simple functions that don't require one. */
306 extern int flag_omit_frame_pointer
;
308 /* Nonzero to inhibit use of define_optimization peephole opts. */
310 extern int flag_no_peephole
;
312 /* Nonzero means all references through pointers are volatile. */
314 extern int flag_volatile
;
316 /* Nonzero means treat all global and extern variables as volatile. */
318 extern int flag_volatile_global
;
320 /* Nonzero means treat all static variables as volatile. */
322 extern int flag_volatile_static
;
324 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
326 extern int flag_optimize_sibling_calls
;
328 /* Nonzero means the front end generally wants `errno' maintained by math
329 operations, like built-in SQRT. */
331 extern int flag_errno_math
;
333 /* Nonzero means that unsafe floating-point math optimizations are allowed
334 for the sake of speed. IEEE compliance is not guaranteed, and operations
335 are allowed to assume that their arguments and results are "normal"
336 (e.g., nonnegative for SQRT). */
338 extern int flag_unsafe_math_optimizations
;
340 /* Zero means that floating-point math operations cannot generate a
341 (user-visible) trap. This is the case, for example, in nonstop
342 IEEE 754 arithmetic. */
344 extern int flag_trapping_math
;
346 /* 0 means straightforward implementation of complex divide acceptable.
347 1 means wide ranges of inputs must work for complex divide.
348 2 means C99-like requirements for complex divide (not yet implemented). */
350 extern int flag_complex_divide_method
;
352 /* Nonzero means to run loop optimizations twice. */
354 extern int flag_rerun_loop_opt
;
356 /* Nonzero means make functions that look like good inline candidates
359 extern int flag_inline_functions
;
361 /* Nonzero for -fkeep-inline-functions: even if we make a function
362 go inline everywhere, keep its definition around for debugging
365 extern int flag_keep_inline_functions
;
367 /* Nonzero means that functions declared `inline' will be treated
368 as `static'. Prevents generation of zillions of copies of unused
369 static inline functions; instead, `inlines' are written out
370 only when actually used. Used in conjunction with -g. Also
371 does the right thing with #pragma interface. */
373 extern int flag_no_inline
;
375 /* Nonzero if we are only using compiler to check syntax errors. */
377 extern int flag_syntax_only
;
379 /* Nonzero means we should save auxiliary info into a .X file. */
381 extern int flag_gen_aux_info
;
383 /* Nonzero means make the text shared if supported. */
385 extern int flag_shared_data
;
387 /* flag_schedule_insns means schedule insns within basic blocks (before
389 flag_schedule_insns_after_reload means schedule insns after
392 extern int flag_schedule_insns
;
393 extern int flag_schedule_insns_after_reload
;
395 /* The following flags have effect only for scheduling before register
398 flag_schedule_interblock means schedule insns accross basic blocks.
399 flag_schedule_speculative means allow speculative motion of non-load insns.
400 flag_schedule_speculative_load means allow speculative motion of some
402 flag_schedule_speculative_load_dangerous allows speculative motion of more
405 extern int flag_schedule_interblock
;
406 extern int flag_schedule_speculative
;
407 extern int flag_schedule_speculative_load
;
408 extern int flag_schedule_speculative_load_dangerous
;
410 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
411 by a cheaper branch, on a count register. */
412 extern int flag_branch_on_count_reg
;
414 /* This option is set to 1 on -fsingle-precision-constant option which is
415 used to convert the floating point constants to single precision
418 extern int flag_single_precision_constant
;
420 /* Nonzero means put things in delayed-branch slots if supported. */
422 extern int flag_delayed_branch
;
424 /* Nonzero means suppress output of instruction numbers and line number
425 notes in debugging dumps. */
427 extern int flag_dump_unnumbered
;
429 /* Nonzero means pretend it is OK to examine bits of target floats,
430 even if that isn't true. The resulting code will have incorrect constants,
431 but the same series of instructions that the native compiler would make. */
433 extern int flag_pretend_float
;
435 /* Nonzero means change certain warnings into errors.
436 Usually these are warnings about failure to conform to some standard. */
438 extern int flag_pedantic_errors
;
440 /* Nonzero means generate position-independent code.
441 This is not fully implemented yet. */
445 /* Nonzero means generate extra code for exception handling and enable
446 exception handling. */
448 extern int flag_exceptions
;
450 /* Nonzero means generate frame unwind info table when supported */
452 extern int flag_unwind_tables
;
454 /* Nonzero means generate frame unwind info table exact at each insn boundary */
456 extern int flag_asynchronous_unwind_tables
;
458 /* Nonzero means don't place uninitialized global data in common storage
461 extern int flag_no_common
;
463 /* -finhibit-size-directive inhibits output of .size for ELF.
464 This is used only for compiling crtstuff.c,
465 and it may be extended to other effects
466 needed for crtstuff.c on other systems. */
467 extern int flag_inhibit_size_directive
;
469 /* Nonzero means place each function into its own section on those platforms
470 which support arbitrary section names and unlimited numbers of sections. */
472 extern int flag_function_sections
;
474 /* ... and similar for data. */
476 extern int flag_data_sections
;
478 /* -fverbose-asm causes extra commentary information to be produced in
479 the generated assembly code (to make it more readable). This option
480 is generally only of use to those who actually need to read the
481 generated assembly code (perhaps while debugging the compiler itself).
482 -fno-verbose-asm, the default, causes the extra information
483 to not be added and is useful when comparing two assembler files. */
485 extern int flag_verbose_asm
;
487 /* -dA causes debug information to be produced in
488 the generated assembly code (to make it more readable). This option
489 is generally only of use to those who actually need to read the
490 generated assembly code (perhaps while debugging the compiler itself).
491 Currently, this switch is only used by dwarfout.c; however, it is intended
492 to be a catchall for printing debug information in the assembler file. */
494 extern int flag_debug_asm
;
496 extern int flag_dump_rtl_in_asm
;
498 /* -fgnu-linker specifies use of the GNU linker for initializations.
499 -fno-gnu-linker says that collect will be used. */
500 extern int flag_gnu_linker
;
502 /* Tag all structures with __attribute__(packed) */
503 extern int flag_pack_struct
;
505 /* This flag is only tested if alias checking is enabled.
506 0 if pointer arguments may alias each other. True in C.
507 1 if pointer arguments may not alias each other but may alias
509 2 if pointer arguments may not alias each other and may not
510 alias global variables. True in Fortran.
511 The value is ignored if flag_alias_check is 0. */
512 extern int flag_argument_noalias
;
514 /* Nonzero if we should do (language-dependent) alias analysis.
515 Typically, this analysis will assume that expressions of certain
516 types do not alias expressions of certain other types. Only used
517 if alias analysis (in general) is enabled. */
518 extern int flag_strict_aliasing
;
520 /* Emit code to probe the stack, to help detect stack overflow; also
521 may cause large objects to be allocated dynamically. */
522 extern int flag_stack_check
;
524 /* Do the full regmove optimization pass. */
525 extern int flag_regmove
;
527 /* Instrument functions with calls at entry and exit, for profiling. */
528 extern int flag_instrument_function_entry_exit
;
530 /* Perform a peephole pass before sched2. */
531 extern int flag_peephole2
;
533 /* Try to guess branch probablities. */
534 extern int flag_guess_branch_prob
;
536 /* -fbounded-pointers causes gcc to compile pointers as composite
537 objects occupying three words: the pointer value, the base address
538 of the referent object, and the address immediately beyond the end
539 of the referent object. The base and extent allow us to perform
540 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
541 extern int flag_bounded_pointers
;
543 /* -fcheck-bounds causes gcc to generate array bounds checks.
544 For C, C++: defaults to value of flag_bounded_pointers.
545 For ObjC: defaults to off.
546 For Java: defaults to on.
547 For Fortran: defaults to off.
548 For CHILL: defaults to off. */
549 extern int flag_bounds_check
;
551 /* This will attempt to merge constant section constants, if 1 only
552 string constants and constants from constant pool, if 2 also constant
554 extern int flag_merge_constants
;
556 /* If one, renumber instruction UIDs to reduce the number of
557 unused UIDs if there are a lot of instructions. If greater than
558 one, unconditionally renumber instruction UIDs. */
559 extern int flag_renumber_insns
;
561 /* Other basic status info about current function. */
563 /* Nonzero means current function must be given a frame pointer.
564 Set in stmt.c if anything is allocated on the stack there.
565 Set in reload1.c if anything is allocated on the stack there. */
567 extern int frame_pointer_needed
;
569 /* Nonzero if GCC must add code to check memory access (used by Checker). */
571 extern int flag_check_memory_usage
;
573 /* Nonzero if the generated code should trap on signed overflow
574 for PLUS / SUB / MULT. */
575 extern int flag_trapv
;
577 /* Nonzero if GCC must prefix function names (used with
578 flag_check_memory_usage). */
580 extern int flag_prefix_function_name
;
582 /* Value of the -G xx switch, and whether it was passed or not. */
583 extern int g_switch_value
;
584 extern int g_switch_set
;
586 /* Values of the -falign-* flags: how much to align labels in code.
587 0 means `use default', 1 means `don't align'.
588 For each variable, there is an _log variant which is the power
589 of two not less than the variable, for .align output. */
591 extern int align_loops
;
592 extern int align_loops_log
;
593 extern int align_jumps
;
594 extern int align_jumps_log
;
595 extern int align_labels
;
596 extern int align_labels_log
;
597 extern int align_functions
;
598 extern int align_functions_log
;
600 /* Nonzero if we dump in VCG format, not plain text. */
601 extern int dump_for_graph
;
603 /* Selection of the graph form. */
604 enum graph_dump_types
609 extern enum graph_dump_types graph_dump_format
;
611 /* Nonzero means ignore `#ident' directives. 0 means handle them.
612 On SVR4 targets, it also controls whether or not to emit a
613 string identifying the compiler. */
615 extern int flag_no_ident
;
617 /* Nonzero if we want to perform enhanced load motion during gcse. */
619 extern int flag_gcse_lm
;
621 /* Nonzero if we want to perform store motion after gcse. */
623 extern int flag_gcse_sm
;
626 /* Nonzero means we should do dwarf2 duplicate elimination. */
628 extern int flag_eliminate_dwarf2_dups
;
630 /* Non-zero means to collect statistics which might be expensive
631 and to print them when we are done. */
632 extern int flag_detailed_statistics
;
634 /* Nonzero means enable synchronous exceptions for non-call instructions. */
635 extern int flag_non_call_exceptions
;
637 #endif /* ! GCC_FLAGS_H */