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 /* Don't print functions as they are compiled and don't print
61 times taken by the various passes. -quiet. */
63 extern int quiet_flag;
65 /* Don't print warning messages. -w. */
67 extern int inhibit_warnings;
69 /* Do print extra warnings (such as for uninitialized variables). -W. */
71 extern int extra_warnings;
73 /* Nonzero to warn about unused local variables. */
75 extern int warn_unused;
77 /* Nonzero to warn about code which is never reached. */
79 extern int warn_notreached;
81 /* Nonzero means warn if inline function is too large. */
83 extern int warn_inline;
85 /* Nonzero to warn about variables used before they are initialized. */
87 extern int warn_uninitialized;
89 /* Zero if unknown pragmas are ignored
90 One if the compiler should warn about an unknown pragma not in
91 a system include file.
92 Greater than one if the compiler should warn for all unknown
95 extern int warn_unknown_pragmas;
97 /* Nonzero means warn about all declarations which shadow others. */
99 extern int warn_shadow;
101 /* Warn if a switch on an enum fails to have a case for every enum value. */
103 extern int warn_switch;
105 /* Nonzero means warn about function definitions that default the return type
106 or that use a null return and have a return-type other than void. */
108 extern int warn_return_type;
110 /* Nonzero means warn about pointer casts that increase the required
111 alignment of the target type (and might therefore lead to a crash
112 due to a misaligned access). */
114 extern int warn_cast_align;
116 /* Nonzero means warn that dbx info for template class methods isn't fully
119 extern int warn_template_debugging;
121 /* Nonzero means warn about any identifiers that match in the first N
122 characters. The value N is in `id_clash_len'. */
124 extern int warn_id_clash;
125 extern unsigned id_clash_len;
127 /* Nonzero means warn about any objects definitions whose size is larger
128 than N bytes. Also want about function definitions whose returned
129 values are larger than N bytes. The value N is in `larger_than_size'. */
131 extern int warn_larger_than;
132 extern unsigned larger_than_size;
134 /* Warn if a function returns an aggregate,
135 since there are often incompatible calling conventions for doing this. */
137 extern int warn_aggregate_return;
139 /* Warn if packed attribute on struct is unnecessary and inefficient. */
141 extern int warn_packed;
143 /* Warn when gcc pads a structure to an alignment boundary. */
145 extern int warn_padded;
147 /* Nonzero if generating code to do profiling. */
149 extern int profile_flag;
151 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
153 extern int profile_block_flag;
155 /* Nonzero if generating code to profile program flow graph arcs. */
157 extern int profile_arc_flag;
159 /* Nonzero if generating info for gcov to calculate line test coverage. */
161 extern int flag_test_coverage;
163 /* Nonzero indicates that branch taken probabilities should be calculated. */
165 extern int flag_branch_probabilities;
167 /* Nonzero for -pedantic switch: warn about anything
168 that standard C forbids. */
172 /* Temporarily suppress certain warnings.
173 This is set while reading code from a system header file. */
175 extern int in_system_header;
177 /* Nonzero for -dp: annotate the assembly with a comment describing the
178 pattern and alternative used. */
180 extern int flag_print_asm_name;
182 /* Now the symbols that are set with `-f' switches. */
184 /* Nonzero means `char' should be signed. */
186 extern int flag_signed_char;
188 /* Nonzero means give an enum type only as many bytes as it needs. */
190 extern int flag_short_enums;
192 /* Nonzero for -fcaller-saves: allocate values in regs that need to
193 be saved across function calls, if that produces overall better code.
194 Optional now, so people can test it. */
196 extern int flag_caller_saves;
198 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
200 extern int flag_pcc_struct_return;
202 /* Nonzero for -fforce-mem: load memory value into a register
203 before arithmetic on it. This makes better cse but slower compilation. */
205 extern int flag_force_mem;
207 /* Nonzero for -fforce-addr: load memory address into a register before
208 reference to memory. This makes better cse but slower compilation. */
210 extern int flag_force_addr;
212 /* Nonzero for -fdefer-pop: don't pop args after each function call;
213 instead save them up to pop many calls' args with one insns. */
215 extern int flag_defer_pop;
217 /* Nonzero for -ffloat-store: don't allocate floats and doubles
218 in extended-precision registers. */
220 extern int flag_float_store;
222 /* Nonzero enables strength-reduction in loop.c. */
224 extern int flag_strength_reduce;
226 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
227 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
228 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
231 extern int flag_unroll_loops;
233 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
234 This is generally not a win. */
236 extern int flag_unroll_all_loops;
238 /* Nonzero forces all invariant computations in loops to be moved
241 extern int flag_move_all_movables;
243 /* Nonzero forces all general induction variables in loops to be
246 extern int flag_reduce_all_givs;
248 /* Nonzero for -fcse-follow-jumps:
249 have cse follow jumps to do a more extensive job. */
251 extern int flag_cse_follow_jumps;
253 /* Nonzero for -fcse-skip-blocks:
254 have cse follow a branch around a block. */
256 extern int flag_cse_skip_blocks;
258 /* Nonzero for -fexpensive-optimizations:
259 perform miscellaneous relatively-expensive optimizations. */
260 extern int flag_expensive_optimizations;
262 /* Nonzero for -fwritable-strings:
263 store string constants in data segment and don't uniquize them. */
265 extern int flag_writable_strings;
267 /* Nonzero means don't put addresses of constant functions in registers.
268 Used for compiling the Unix kernel, where strange substitutions are
269 done on the assembly output. */
271 extern int flag_no_function_cse;
273 /* Nonzero for -fomit-frame-pointer:
274 don't make a frame pointer in simple functions that don't require one. */
276 extern int flag_omit_frame_pointer;
278 /* Nonzero to inhibit use of define_optimization peephole opts. */
280 extern int flag_no_peephole;
282 /* Nonzero means all references through pointers are volatile. */
284 extern int flag_volatile;
286 /* Nonzero means treat all global and extern variables as volatile. */
288 extern int flag_volatile_global;
290 /* Nonzero means treat all static variables as volatile. */
292 extern int flag_volatile_static;
294 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
295 operations in the interest of optimization. For example it allows
296 GCC to assume arguments to sqrt are nonnegative numbers, allowing
297 faster code for sqrt to be generated. */
299 extern int flag_fast_math;
301 /* Nonzero means the front end generally wants `errno' maintained by math
302 operations, like built-in SQRT, unless overridden by flag_fast_math. */
304 extern int flag_errno_math;
306 /* 0 means straightforward implementation of complex divide acceptable.
307 1 means wide ranges of inputs must work for complex divide.
308 2 means C9X-like requirements for complex divide (not yet implemented). */
310 extern int flag_complex_divide_method;
312 /* Nonzero means to run loop optimizations twice. */
314 extern int flag_rerun_loop_opt;
316 /* Nonzero means make functions that look like good inline candidates
319 extern int flag_inline_functions;
321 /* Nonzero for -fkeep-inline-functions: even if we make a function
322 go inline everywhere, keep its definition around for debugging
325 extern int flag_keep_inline_functions;
327 /* Nonzero means that functions declared `inline' will be treated
328 as `static'. Prevents generation of zillions of copies of unused
329 static inline functions; instead, `inlines' are written out
330 only when actually used. Used in conjunction with -g. Also
331 does the right thing with #pragma interface. */
333 extern int flag_no_inline;
335 /* Nonzero if we are only using compiler to check syntax errors. */
337 extern int flag_syntax_only;
339 /* Nonzero means we should save auxiliary info into a .X file. */
341 extern int flag_gen_aux_info;
343 /* Nonzero means make the text shared if supported. */
345 extern int flag_shared_data;
347 /* flag_schedule_insns means schedule insns within basic blocks (before
349 flag_schedule_insns_after_reload means schedule insns after
352 extern int flag_schedule_insns;
353 extern int flag_schedule_insns_after_reload;
355 /* The following flags have effect only for scheduling before register
358 flag_schedule_interblock means schedule insns accross basic blocks.
359 flag_schedule_speculative means allow speculative motion of non-load insns.
360 flag_schedule_speculative_load means allow speculative motion of some
362 flag_schedule_speculative_load_dangerous allows speculative motion of more
365 extern int flag_schedule_interblock;
366 extern int flag_schedule_speculative;
367 extern int flag_schedule_speculative_load;
368 extern int flag_schedule_speculative_load_dangerous;
370 /* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple
371 by a cheaper branch, on a count register. */
372 extern int flag_branch_on_count_reg;
375 /* Nonzero means put things in delayed-branch slots if supported. */
377 extern int flag_delayed_branch;
379 /* Nonzero means suppress output of instruction numbers and line number
380 notes in debugging dumps. */
382 extern int flag_dump_unnumbered;
384 /* Nonzero means pretend it is OK to examine bits of target floats,
385 even if that isn't true. The resulting code will have incorrect constants,
386 but the same series of instructions that the native compiler would make. */
388 extern int flag_pretend_float;
390 /* Nonzero means change certain warnings into errors.
391 Usually these are warnings about failure to conform to some standard. */
393 extern int flag_pedantic_errors;
395 /* Nonzero means generate position-independent code.
396 This is not fully implemented yet. */
400 /* Nonzero means generate extra code for exception handling and enable
401 exception handling. */
403 extern int flag_exceptions;
405 /* Nonzero means use the new model for exception handling. Replaces
406 -DNEW_EH_MODEL as a compile option. */
408 extern int flag_new_exceptions;
410 /* Nonzero means generate frame unwind info table when supported */
412 extern int flag_unwind_tables;
414 /* Nonzero means don't place uninitialized global data in common storage
417 extern int flag_no_common;
419 /* -finhibit-size-directive inhibits output of .size for ELF.
420 This is used only for compiling crtstuff.c,
421 and it may be extended to other effects
422 needed for crtstuff.c on other systems. */
423 extern int flag_inhibit_size_directive;
425 /* Nonzero means place each function into its own section on those platforms
426 which support arbitrary section names and unlimited numbers of sections. */
428 extern int flag_function_sections;
430 /* ... and similar for data. */
432 extern int flag_data_sections;
434 /* -fverbose-asm causes extra commentary information to be produced in
435 the generated assembly code (to make it more readable). This option
436 is generally only of use to those who actually need to read the
437 generated assembly code (perhaps while debugging the compiler itself).
438 -fno-verbose-asm, the default, causes the extra information
439 to not be added and is useful when comparing two assembler files. */
441 extern int flag_verbose_asm;
443 /* -dA causes debug information to be produced in
444 the generated assembly code (to make it more readable). This option
445 is generally only of use to those who actually need to read the
446 generated assembly code (perhaps while debugging the compiler itself).
447 Currently, this switch is only used by dwarfout.c; however, it is intended
448 to be a catchall for printing debug information in the assembler file. */
450 extern int flag_debug_asm;
452 /* -fgnu-linker specifies use of the GNU linker for initializations.
453 -fno-gnu-linker says that collect will be used. */
454 extern int flag_gnu_linker;
456 /* Tag all structures with __attribute__(packed) */
457 extern int flag_pack_struct;
459 /* This flag is only tested if alias checking is enabled.
460 0 if pointer arguments may alias each other. True in C.
461 1 if pointer arguments may not alias each other but may alias
463 2 if pointer arguments may not alias each other and may not
464 alias global variables. True in Fortran.
465 The value is ignored if flag_alias_check is 0. */
466 extern int flag_argument_noalias;
468 /* Nonzero if we should do (language-dependent) alias analysis.
469 Typically, this analysis will assume that expressions of certain
470 types do not alias expressions of certain other types. Only used
471 if alias analysis (in general) is enabled. */
472 extern int flag_strict_aliasing;
474 /* Emit code to probe the stack, to help detect stack overflow; also
475 may cause large objects to be allocated dynamically. */
476 extern int flag_stack_check;
478 /* Do the full regmove optimization pass. */
479 extern int flag_regmove;
481 /* Instrument functions with calls at entry and exit, for profiling. */
482 extern int flag_instrument_function_entry_exit;
484 /* Perform a peephole pass before sched2. */
485 extern int flag_peephole2;
487 /* -fbounded-pointers causes gcc to compile pointers as composite
488 objects occupying three words: the pointer value, the base address
489 of the referent object, and the address immediately beyond the end
490 of the referent object. The base and extent allow us to perform
491 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
492 extern int flag_bounded_pointers;
494 /* -fcheck-bounds causes gcc to generate array bounds checks.
495 For C, C++: defaults to value of flag_bounded_pointers.
496 For ObjC: defaults to off.
497 For Java: defaults to on.
498 For Fortran: defaults to off.
499 For CHILL: defaults to off. */
500 extern int flag_bounds_check;
502 /* If one, renumber instruction UIDs to reduce the number of
503 unused UIDs if there are a lot of instructions. If greater than
504 one, unconditionally renumber instruction UIDs. */
505 extern int flag_renumber_insns;
507 /* Other basic status info about current function. */
509 /* Nonzero means current function must be given a frame pointer.
510 Set in stmt.c if anything is allocated on the stack there.
511 Set in reload1.c if anything is allocated on the stack there. */
513 extern int frame_pointer_needed;
515 /* Set nonzero if jump_optimize finds that control falls through
516 at the end of the function. */
518 extern int can_reach_end;
520 /* Nonzero if GCC must add code to check memory access (used by Checker). */
522 extern int flag_check_memory_usage;
524 /* Nonzero if GCC must prefix function names (used with
525 flag_check_memory_usage). */
527 extern int flag_prefix_function_name;
529 /* Value of the -G xx switch, and whether it was passed or not. */
530 extern int g_switch_value;
531 extern int g_switch_set;
533 /* Value of the -finline-limit flag. */
535 extern int inline_max_insns;
537 /* Values of the -falign-* flags: how much to align labels in code.
538 0 means `use default', 1 means `don't align'.
539 For each variable, there is an _log variant which is the power
540 of two not less than the variable, for .align output. */
542 extern int align_loops;
543 extern int align_loops_log;
544 extern int align_jumps;
545 extern int align_jumps_log;
546 extern int align_labels;
547 extern int align_labels_log;
548 extern int align_functions;
549 extern int align_functions_log;
551 /* Nonzero if we dump in VCG format, not plain text. */
552 extern int dump_for_graph;
554 /* Selection of the graph form. */
555 enum graph_dump_types
560 extern enum graph_dump_types graph_dump_format;
562 /* Nonzero means ignore `#ident' directives. 0 means handle them.
563 On SVR4 targets, it also controls whether or not to emit a
564 string identifying the compiler. */
566 extern int flag_no_ident;