1 /* Compilation switch flag definitions for GNU CC.
2 Copyright (C) 1987, 88, 94-98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Name of the input .c file being compiled. */
22 extern char *main_input_filename
;
26 NO_DEBUG
, /* Write no debug info. */
27 DBX_DEBUG
, /* Write BSD .stabs for DBX (using dbxout.c). */
28 SDB_DEBUG
, /* Write COFF for (old) SDB (using sdbout.c). */
29 DWARF_DEBUG
, /* Write Dwarf debug info (using dwarfout.c). */
30 DWARF2_DEBUG
, /* Write Dwarf v2 debug info (using dwarf2out.c). */
31 XCOFF_DEBUG
/* Write IBM/Xcoff debug info (using dbxout.c). */
34 /* Specify which kind of debugging info to generate. */
35 extern enum debug_info_type write_symbols
;
39 DINFO_LEVEL_NONE
, /* Write no debugging info. */
40 DINFO_LEVEL_TERSE
, /* Write minimal info to support tracebacks only. */
41 DINFO_LEVEL_NORMAL
, /* Write info for all declarations (and line table). */
42 DINFO_LEVEL_VERBOSE
/* Write normal info plus #define/#undef info. */
45 /* Specify how much debugging info to generate. */
46 extern enum debug_info_level debug_info_level
;
48 /* Nonzero means use GNU-only extensions in the generated symbolic
49 debugging information. */
50 extern int use_gnu_debug_info_extensions
;
52 /* Nonzero means do optimizations. -opt. */
56 /* Nonzero means optimize for size. -Os. */
58 extern int optimize_size
;
60 /* Nonzero means do stupid register allocation. -noreg.
61 Currently, this is 1 if `optimize' is 0. */
63 extern int obey_regdecls
;
65 /* Don't print functions as they are compiled and don't print
66 times taken by the various passes. -quiet. */
68 extern int quiet_flag
;
70 /* Don't print warning messages. -w. */
72 extern int inhibit_warnings
;
74 /* Do print extra warnings (such as for uninitialized variables). -W. */
76 extern int extra_warnings
;
78 /* Nonzero to warn about unused local variables. */
80 extern int warn_unused
;
82 /* Nonzero means warn if inline function is too large. */
84 extern int warn_inline
;
86 /* Nonzero to warn about variables used before they are initialized. */
88 extern int warn_uninitialized
;
90 /* Zero if unknown pragmas are ignored
91 One if the compiler should warn about an unknown pragma not in
92 a system include file.
93 Greater than one if the compiler should warn for all unknown
96 extern int warn_unknown_pragmas
;
98 /* Nonzero means warn about all declarations which shadow others. */
100 extern int warn_shadow
;
102 /* Warn if a switch on an enum fails to have a case for every enum value. */
104 extern int warn_switch
;
106 /* Nonzero means warn about function definitions that default the return type
107 or that use a null return and have a return-type other than void. */
109 extern int warn_return_type
;
111 /* Nonzero means warn about pointer casts that increase the required
112 alignment of the target type (and might therefore lead to a crash
113 due to a misaligned access). */
115 extern int warn_cast_align
;
117 /* Nonzero means warn that dbx info for template class methods isn't fully
120 extern int warn_template_debugging
;
122 /* Nonzero means warn about any identifiers that match in the first N
123 characters. The value N is in `id_clash_len'. */
125 extern int warn_id_clash
;
126 extern unsigned id_clash_len
;
128 /* Nonzero means warn about any objects definitions whose size is larger
129 than N bytes. Also want about function definitions whose returned
130 values are larger than N bytes. The value N is in `larger_than_size'. */
132 extern int warn_larger_than
;
133 extern unsigned larger_than_size
;
135 /* Warn if a function returns an aggregate,
136 since there are often incompatible calling conventions for doing this. */
138 extern int warn_aggregate_return
;
140 /* Nonzero if generating code to do profiling. */
142 extern int profile_flag
;
144 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
146 extern int profile_block_flag
;
148 /* Nonzero if generating code to profile program flow graph arcs. */
150 extern int profile_arc_flag
;
152 /* Nonzero if generating info for gcov to calculate line test coverage. */
154 extern int flag_test_coverage
;
156 /* Nonzero indicates that branch taken probabilities should be calculated. */
158 extern int flag_branch_probabilities
;
160 /* Nonzero for -pedantic switch: warn about anything
161 that standard C forbids. */
165 /* Temporarily suppress certain warnings.
166 This is set while reading code from a system header file. */
168 extern int in_system_header
;
170 /* Nonzero for -dp: annotate the assembly with a comment describing the
171 pattern and alternative used. */
173 extern int flag_print_asm_name
;
175 /* Now the symbols that are set with `-f' switches. */
177 /* Nonzero means `char' should be signed. */
179 extern int flag_signed_char
;
181 /* Nonzero means give an enum type only as many bytes as it needs. */
183 extern int flag_short_enums
;
185 /* Nonzero for -fcaller-saves: allocate values in regs that need to
186 be saved across function calls, if that produces overall better code.
187 Optional now, so people can test it. */
189 extern int flag_caller_saves
;
191 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
193 extern int flag_pcc_struct_return
;
195 /* Nonzero for -fforce-mem: load memory value into a register
196 before arithmetic on it. This makes better cse but slower compilation. */
198 extern int flag_force_mem
;
200 /* Nonzero for -fforce-addr: load memory address into a register before
201 reference to memory. This makes better cse but slower compilation. */
203 extern int flag_force_addr
;
205 /* Nonzero for -fdefer-pop: don't pop args after each function call;
206 instead save them up to pop many calls' args with one insns. */
208 extern int flag_defer_pop
;
210 /* Nonzero for -ffloat-store: don't allocate floats and doubles
211 in extended-precision registers. */
213 extern int flag_float_store
;
215 /* Nonzero enables strength-reduction in loop.c. */
217 extern int flag_strength_reduce
;
219 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
220 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
221 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
224 extern int flag_unroll_loops
;
226 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
227 This is generally not a win. */
229 extern int flag_unroll_all_loops
;
231 /* Nonzero forces all invariant computations in loops to be moved
234 extern int flag_move_all_movables
;
236 /* Nonzero forces all general induction variables in loops to be
239 extern int flag_reduce_all_givs
;
241 /* Nonzero for -fcse-follow-jumps:
242 have cse follow jumps to do a more extensive job. */
244 extern int flag_cse_follow_jumps
;
246 /* Nonzero for -fcse-skip-blocks:
247 have cse follow a branch around a block. */
249 extern int flag_cse_skip_blocks
;
251 /* Nonzero for -fexpensive-optimizations:
252 perform miscellaneous relatively-expensive optimizations. */
253 extern int flag_expensive_optimizations
;
255 /* Nonzero for -fwritable-strings:
256 store string constants in data segment and don't uniquize them. */
258 extern int flag_writable_strings
;
260 /* Nonzero means don't put addresses of constant functions in registers.
261 Used for compiling the Unix kernel, where strange substitutions are
262 done on the assembly output. */
264 extern int flag_no_function_cse
;
266 /* Nonzero for -fomit-frame-pointer:
267 don't make a frame pointer in simple functions that don't require one. */
269 extern int flag_omit_frame_pointer
;
271 /* Nonzero to inhibit use of define_optimization peephole opts. */
273 extern int flag_no_peephole
;
275 /* Nonzero means all references through pointers are volatile. */
277 extern int flag_volatile
;
279 /* Nonzero means treat all global and extern variables as volatile. */
281 extern int flag_volatile_global
;
283 /* Nonzero means treat all static variables as volatile. */
285 extern int flag_volatile_static
;
287 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
288 operations in the interest of optimization. For example it allows
289 GCC to assume arguments to sqrt are nonnegative numbers, allowing
290 faster code for sqrt to be generated. */
292 extern int flag_fast_math
;
294 /* Nonzero means to run loop optimizations twice. */
296 extern int flag_rerun_loop_opt
;
298 /* Nonzero means make functions that look like good inline candidates
301 extern int flag_inline_functions
;
303 /* Nonzero for -fkeep-inline-functions: even if we make a function
304 go inline everywhere, keep its definition around for debugging
307 extern int flag_keep_inline_functions
;
309 /* Nonzero means that functions declared `inline' will be treated
310 as `static'. Prevents generation of zillions of copies of unused
311 static inline functions; instead, `inlines' are written out
312 only when actually used. Used in conjunction with -g. Also
313 does the right thing with #pragma interface. */
315 extern int flag_no_inline
;
317 /* Nonzero if we are only using compiler to check syntax errors. */
319 extern int flag_syntax_only
;
321 /* Nonzero means we should save auxiliary info into a .X file. */
323 extern int flag_gen_aux_info
;
325 /* Nonzero means make the text shared if supported. */
327 extern int flag_shared_data
;
329 /* flag_schedule_insns means schedule insns within basic blocks (before
331 flag_schedule_insns_after_reload means schedule insns after
334 extern int flag_schedule_insns
;
335 extern int flag_schedule_insns_after_reload
;
338 /* The following flags have effect only for scheduling before register
341 flag_schedule_interblock means schedule insns accross basic blocks.
342 flag_schedule_speculative means allow speculative motion of non-load insns.
343 flag_schedule_speculative_load means allow speculative motion of some
345 flag_schedule_speculative_load_dangerous allows speculative motion of more
348 extern int flag_schedule_interblock
;
349 extern int flag_schedule_speculative
;
350 extern int flag_schedule_speculative_load
;
351 extern int flag_schedule_speculative_load_dangerous
;
354 /* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple
355 by a cheaper branch, on a count register. */
356 extern int flag_branch_on_count_reg
;
359 /* Nonzero means put things in delayed-branch slots if supported. */
361 extern int flag_delayed_branch
;
363 /* Nonzero means suppress output of instruction numbers and line number
364 notes in debugging dumps. */
366 extern int flag_dump_unnumbered
;
368 /* Nonzero means pretend it is OK to examine bits of target floats,
369 even if that isn't true. The resulting code will have incorrect constants,
370 but the same series of instructions that the native compiler would make. */
372 extern int flag_pretend_float
;
374 /* Nonzero means change certain warnings into errors.
375 Usually these are warnings about failure to conform to some standard. */
377 extern int flag_pedantic_errors
;
379 /* Nonzero means generate position-independent code.
380 This is not fully implemented yet. */
384 /* Nonzero means generate extra code for exception handling and enable
385 exception handling. */
387 extern int flag_exceptions
;
389 /* Nonzero means use the new model for exception handling. Replaces
390 -DNEW_EH_MODEL as a compile option. */
392 extern int flag_new_exceptions
;
394 /* Nonzero means don't place uninitialized global data in common storage
397 extern int flag_no_common
;
399 /* -finhibit-size-directive inhibits output of .size for ELF.
400 This is used only for compiling crtstuff.c,
401 and it may be extended to other effects
402 needed for crtstuff.c on other systems. */
403 extern int flag_inhibit_size_directive
;
405 /* Nonzero means place each function into its own section on those platforms
406 which support arbitrary section names and unlimited numbers of sections. */
408 extern int flag_function_sections
;
410 /* ... and similar for data. */
412 extern int flag_data_sections
;
414 /* -fverbose-asm causes extra commentary information to be produced in
415 the generated assembly code (to make it more readable). This option
416 is generally only of use to those who actually need to read the
417 generated assembly code (perhaps while debugging the compiler itself).
418 -fno-verbose-asm, the default, causes the extra information
419 to not be added and is useful when comparing two assembler files. */
421 extern int flag_verbose_asm
;
423 /* -dA causes debug information to be produced in
424 the generated assembly code (to make it more readable). This option
425 is generally only of use to those who actually need to read the
426 generated assembly code (perhaps while debugging the compiler itself).
427 Currently, this switch is only used by dwarfout.c; however, it is intended
428 to be a catchall for printing debug information in the assembler file. */
430 extern int flag_debug_asm
;
432 /* -fgnu-linker specifies use of the GNU linker for initializations.
433 -fno-gnu-linker says that collect will be used. */
434 extern int flag_gnu_linker
;
436 /* Tag all structures with __attribute__(packed) */
437 extern int flag_pack_struct
;
439 /* This flag is only tested if alias checking is enabled.
440 0 if pointer arguments may alias each other. True in C.
441 1 if pointer arguments may not alias each other but may alias
443 2 if pointer arguments may not alias each other and may not
444 alias global variables. True in Fortran.
445 The value is ignored if flag_alias_check is 0. */
446 extern int flag_argument_noalias
;
448 /* Nonzero if we should do (language-dependent) alias analysis.
449 Typically, this analysis will assume that expressions of certain
450 types do not alias expressions of certain other types. Only used
451 if alias analysis (in general) is enabled. */
452 extern int flag_strict_aliasing
;
454 /* Emit code to check for stack overflow; also may cause large objects
455 to be allocated dynamically. */
456 extern int flag_stack_check
;
458 /* Do the full regmove optimization pass. */
459 extern int flag_regmove
;
461 /* Instrument functions with calls at entry and exit, for profiling. */
462 extern int flag_instrument_function_entry_exit
;
464 /* Other basic status info about current function. */
466 /* Nonzero means current function must be given a frame pointer.
467 Set in stmt.c if anything is allocated on the stack there.
468 Set in reload1.c if anything is allocated on the stack there. */
470 extern int frame_pointer_needed
;
472 /* Set nonzero if jump_optimize finds that control falls through
473 at the end of the function. */
475 extern int can_reach_end
;
477 /* Nonzero if function being compiled receives nonlocal gotos
478 from nested functions. */
480 extern int current_function_has_nonlocal_label
;
482 /* Nonzero if function being compiled has nonlocal gotos to parent
485 extern int current_function_has_nonlocal_goto
;
487 /* Nonzero if this function has a computed goto.
489 It is computed during find_basic_blocks or during stupid life
492 extern int current_function_has_computed_jump
;
494 /* Nonzero if GCC must add code to check memory access (used by Checker). */
496 extern int flag_check_memory_usage
;
498 /* Nonzero if GCC must prefix function names (used with
499 flag_check_memory_usage). */
501 extern int flag_prefix_function_name
;
502 /* Nonzero if the current function is a thunk, so we should try to cut
503 corners where we can. */
504 extern int current_function_is_thunk
;
506 /* Value of the -G xx switch, and whether it was passed or not. */
507 extern int g_switch_value
;
508 extern int g_switch_set
;
510 /* Nonzero if we dump in VCG format, not plain text. */
511 extern int dump_for_graph
;
513 /* Selection of the graph form. */
514 enum graph_dump_types
519 extern enum graph_dump_types graph_dump_format
;
521 /* Nonzero means ignore `#ident' directives. 0 means handle them.
522 On SVR4 targets, it also controls whether or not to emit a
523 string identifying the compiler. */
525 extern int flag_no_ident
;