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 /* Do print extra warnings (such as for uninitialized variables). -W. */
84 extern int extra_warnings;
86 /* Nonzero to warn about unused variables, functions et.al. Use
87 set_Wunused() to update the -Wunused-* flags that correspond to the
90 extern void set_Wunused PARAMS ((int setting));
92 extern int warn_unused_function;
93 extern int warn_unused_label;
94 extern int warn_unused_parameter;
95 extern int warn_unused_variable;
96 extern int warn_unused_value;
98 /* Nonzero to warn about code which is never reached. */
100 extern int warn_notreached;
102 /* Nonzero means warn if inline function is too large. */
104 extern int warn_inline;
106 /* Nonzero to warn about variables used before they are initialized. */
108 extern int warn_uninitialized;
110 /* Zero if unknown pragmas are ignored
111 One if the compiler should warn about an unknown pragma not in
112 a system include file.
113 Greater than one if the compiler should warn for all unknown
116 extern int warn_unknown_pragmas;
118 /* Nonzero means warn about all declarations which shadow others. */
120 extern int warn_shadow;
122 /* Warn if a switch on an enum fails to have a case for every enum value. */
124 extern int warn_switch;
126 /* Nonzero means warn about function definitions that default the return type
127 or that use a null return and have a return-type other than void. */
129 extern int warn_return_type;
131 /* Nonzero means warn about pointer casts that increase the required
132 alignment of the target type (and might therefore lead to a crash
133 due to a misaligned access). */
135 extern int warn_cast_align;
137 /* Nonzero means warn about any identifiers that match in the first N
138 characters. The value N is in `id_clash_len'. */
140 extern int warn_id_clash;
141 extern int id_clash_len;
143 /* Nonzero means warn about any objects definitions whose size is larger
144 than N bytes. Also want about function definitions whose returned
145 values are larger than N bytes. The value N is in `larger_than_size'. */
147 extern int warn_larger_than;
148 extern HOST_WIDE_INT larger_than_size;
150 /* Warn if a function returns an aggregate,
151 since there are often incompatible calling conventions for doing this. */
153 extern int warn_aggregate_return;
155 /* Warn if packed attribute on struct is unnecessary and inefficient. */
157 extern int warn_packed;
159 /* Warn when gcc pads a structure to an alignment boundary. */
161 extern int warn_padded;
163 /* Warn when an optimization pass is disabled. */
165 extern int warn_disabled_optimization;
167 /* Nonzero if generating code to do profiling. */
169 extern int profile_flag;
171 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
173 extern int profile_block_flag;
175 /* Nonzero if generating code to profile program flow graph arcs. */
177 extern int profile_arc_flag;
179 /* Nonzero if generating info for gcov to calculate line test coverage. */
181 extern int flag_test_coverage;
183 /* Nonzero indicates that branch taken probabilities should be calculated. */
185 extern int flag_branch_probabilities;
187 /* Nonzero for -pedantic switch: warn about anything
188 that standard C forbids. */
192 /* Temporarily suppress certain warnings.
193 This is set while reading code from a system header file. */
195 extern int in_system_header;
197 /* Nonzero for -dp: annotate the assembly with a comment describing the
198 pattern and alternative used. */
200 extern int flag_print_asm_name;
202 /* Now the symbols that are set with `-f' switches. */
204 /* Nonzero means `char' should be signed. */
206 extern int flag_signed_char;
208 /* Nonzero means give an enum type only as many bytes as it needs. */
210 extern int flag_short_enums;
212 /* Nonzero for -fcaller-saves: allocate values in regs that need to
213 be saved across function calls, if that produces overall better code.
214 Optional now, so people can test it. */
216 extern int flag_caller_saves;
218 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
220 extern int flag_pcc_struct_return;
222 /* Nonzero for -fforce-mem: load memory value into a register
223 before arithmetic on it. This makes better cse but slower compilation. */
225 extern int flag_force_mem;
227 /* Nonzero for -fforce-addr: load memory address into a register before
228 reference to memory. This makes better cse but slower compilation. */
230 extern int flag_force_addr;
232 /* Nonzero for -fdefer-pop: don't pop args after each function call;
233 instead save them up to pop many calls' args with one insns. */
235 extern int flag_defer_pop;
237 /* Nonzero for -ffloat-store: don't allocate floats and doubles
238 in extended-precision registers. */
240 extern int flag_float_store;
242 /* Nonzero enables strength-reduction in loop.c. */
244 extern int flag_strength_reduce;
246 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
247 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
248 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
251 extern int flag_unroll_loops;
253 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
254 This is generally not a win. */
256 extern int flag_unroll_all_loops;
258 /* Nonzero forces all invariant computations in loops to be moved
261 extern int flag_move_all_movables;
263 /* Nonzero forces all general induction variables in loops to be
266 extern int flag_reduce_all_givs;
268 /* Nonzero for -fcse-follow-jumps:
269 have cse follow jumps to do a more extensive job. */
271 extern int flag_cse_follow_jumps;
273 /* Nonzero for -fcse-skip-blocks:
274 have cse follow a branch around a block. */
276 extern int flag_cse_skip_blocks;
278 /* Nonzero for -fexpensive-optimizations:
279 perform miscellaneous relatively-expensive optimizations. */
280 extern int flag_expensive_optimizations;
282 /* Nonzero for -fwritable-strings:
283 store string constants in data segment and don't uniquize them. */
285 extern int flag_writable_strings;
287 /* Nonzero means don't put addresses of constant functions in registers.
288 Used for compiling the Unix kernel, where strange substitutions are
289 done on the assembly output. */
291 extern int flag_no_function_cse;
293 /* Nonzero for -fomit-frame-pointer:
294 don't make a frame pointer in simple functions that don't require one. */
296 extern int flag_omit_frame_pointer;
298 /* Nonzero to inhibit use of define_optimization peephole opts. */
300 extern int flag_no_peephole;
302 /* Nonzero means all references through pointers are volatile. */
304 extern int flag_volatile;
306 /* Nonzero means treat all global and extern variables as volatile. */
308 extern int flag_volatile_global;
310 /* Nonzero means treat all static variables as volatile. */
312 extern int flag_volatile_static;
314 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
315 operations in the interest of optimization. For example it allows
316 GCC to assume arguments to sqrt are nonnegative numbers, allowing
317 faster code for sqrt to be generated. */
319 extern int flag_fast_math;
321 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
323 extern int flag_optimize_sibling_calls;
325 /* Nonzero means the front end generally wants `errno' maintained by math
326 operations, like built-in SQRT, unless overridden by flag_fast_math. */
328 extern int flag_errno_math;
330 /* 0 means straightforward implementation of complex divide acceptable.
331 1 means wide ranges of inputs must work for complex divide.
332 2 means C9X-like requirements for complex divide (not yet implemented). */
334 extern int flag_complex_divide_method;
336 /* Nonzero means to run loop optimizations twice. */
338 extern int flag_rerun_loop_opt;
340 /* Nonzero means make functions that look like good inline candidates
343 extern int flag_inline_functions;
345 /* Nonzero for -fkeep-inline-functions: even if we make a function
346 go inline everywhere, keep its definition around for debugging
349 extern int flag_keep_inline_functions;
351 /* Nonzero means that functions declared `inline' will be treated
352 as `static'. Prevents generation of zillions of copies of unused
353 static inline functions; instead, `inlines' are written out
354 only when actually used. Used in conjunction with -g. Also
355 does the right thing with #pragma interface. */
357 extern int flag_no_inline;
359 /* Nonzero if we are only using compiler to check syntax errors. */
361 extern int flag_syntax_only;
363 /* Nonzero means we should save auxiliary info into a .X file. */
365 extern int flag_gen_aux_info;
367 /* Nonzero means make the text shared if supported. */
369 extern int flag_shared_data;
371 /* flag_schedule_insns means schedule insns within basic blocks (before
373 flag_schedule_insns_after_reload means schedule insns after
376 extern int flag_schedule_insns;
377 extern int flag_schedule_insns_after_reload;
379 /* The following flags have effect only for scheduling before register
382 flag_schedule_interblock means schedule insns accross basic blocks.
383 flag_schedule_speculative means allow speculative motion of non-load insns.
384 flag_schedule_speculative_load means allow speculative motion of some
386 flag_schedule_speculative_load_dangerous allows speculative motion of more
389 extern int flag_schedule_interblock;
390 extern int flag_schedule_speculative;
391 extern int flag_schedule_speculative_load;
392 extern int flag_schedule_speculative_load_dangerous;
394 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
395 by a cheaper branch, on a count register. */
396 extern int flag_branch_on_count_reg;
398 /* This option is set to 1 on -fsingle-precision-constant option which is
399 used to convert the floating point constants to single precision
402 extern int flag_single_precision_constant;
404 /* Nonzero means put things in delayed-branch slots if supported. */
406 extern int flag_delayed_branch;
408 /* Nonzero means suppress output of instruction numbers and line number
409 notes in debugging dumps. */
411 extern int flag_dump_unnumbered;
413 /* Nonzero means pretend it is OK to examine bits of target floats,
414 even if that isn't true. The resulting code will have incorrect constants,
415 but the same series of instructions that the native compiler would make. */
417 extern int flag_pretend_float;
419 /* Nonzero means change certain warnings into errors.
420 Usually these are warnings about failure to conform to some standard. */
422 extern int flag_pedantic_errors;
424 /* Nonzero means generate position-independent code.
425 This is not fully implemented yet. */
429 /* Nonzero means generate extra code for exception handling and enable
430 exception handling. */
432 extern int flag_exceptions;
434 /* Nonzero means use the new model for exception handling. Replaces
435 -DNEW_EH_MODEL as a compile option. */
437 extern int flag_new_exceptions;
439 /* Nonzero means generate frame unwind info table when supported */
441 extern int flag_unwind_tables;
443 /* Nonzero means don't place uninitialized global data in common storage
446 extern int flag_no_common;
448 /* -finhibit-size-directive inhibits output of .size for ELF.
449 This is used only for compiling crtstuff.c,
450 and it may be extended to other effects
451 needed for crtstuff.c on other systems. */
452 extern int flag_inhibit_size_directive;
454 /* Nonzero means place each function into its own section on those platforms
455 which support arbitrary section names and unlimited numbers of sections. */
457 extern int flag_function_sections;
459 /* ... and similar for data. */
461 extern int flag_data_sections;
463 /* -fverbose-asm causes extra commentary information to be produced in
464 the generated assembly code (to make it more readable). This option
465 is generally only of use to those who actually need to read the
466 generated assembly code (perhaps while debugging the compiler itself).
467 -fno-verbose-asm, the default, causes the extra information
468 to not be added and is useful when comparing two assembler files. */
470 extern int flag_verbose_asm;
472 /* -dA causes debug information to be produced in
473 the generated assembly code (to make it more readable). This option
474 is generally only of use to those who actually need to read the
475 generated assembly code (perhaps while debugging the compiler itself).
476 Currently, this switch is only used by dwarfout.c; however, it is intended
477 to be a catchall for printing debug information in the assembler file. */
479 extern int flag_debug_asm;
481 extern int flag_dump_rtl_in_asm;
483 /* -fgnu-linker specifies use of the GNU linker for initializations.
484 -fno-gnu-linker says that collect will be used. */
485 extern int flag_gnu_linker;
487 /* Tag all structures with __attribute__(packed) */
488 extern int flag_pack_struct;
490 /* This flag is only tested if alias checking is enabled.
491 0 if pointer arguments may alias each other. True in C.
492 1 if pointer arguments may not alias each other but may alias
494 2 if pointer arguments may not alias each other and may not
495 alias global variables. True in Fortran.
496 The value is ignored if flag_alias_check is 0. */
497 extern int flag_argument_noalias;
499 /* Nonzero if we should do (language-dependent) alias analysis.
500 Typically, this analysis will assume that expressions of certain
501 types do not alias expressions of certain other types. Only used
502 if alias analysis (in general) is enabled. */
503 extern int flag_strict_aliasing;
505 /* Emit code to probe the stack, to help detect stack overflow; also
506 may cause large objects to be allocated dynamically. */
507 extern int flag_stack_check;
509 /* Do the full regmove optimization pass. */
510 extern int flag_regmove;
512 /* Instrument functions with calls at entry and exit, for profiling. */
513 extern int flag_instrument_function_entry_exit;
515 /* Perform a peephole pass before sched2. */
516 extern int flag_peephole2;
518 /* -fbounded-pointers causes gcc to compile pointers as composite
519 objects occupying three words: the pointer value, the base address
520 of the referent object, and the address immediately beyond the end
521 of the referent object. The base and extent allow us to perform
522 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
523 extern int flag_bounded_pointers;
525 /* -fcheck-bounds causes gcc to generate array bounds checks.
526 For C, C++: defaults to value of flag_bounded_pointers.
527 For ObjC: defaults to off.
528 For Java: defaults to on.
529 For Fortran: defaults to off.
530 For CHILL: defaults to off. */
531 extern int flag_bounds_check;
533 /* If one, renumber instruction UIDs to reduce the number of
534 unused UIDs if there are a lot of instructions. If greater than
535 one, unconditionally renumber instruction UIDs. */
536 extern int flag_renumber_insns;
538 /* Other basic status info about current function. */
540 /* Nonzero means current function must be given a frame pointer.
541 Set in stmt.c if anything is allocated on the stack there.
542 Set in reload1.c if anything is allocated on the stack there. */
544 extern int frame_pointer_needed;
546 /* Set nonzero if jump_optimize finds that control falls through
547 at the end of the function. */
549 extern int can_reach_end;
551 /* Nonzero if GCC must add code to check memory access (used by Checker). */
553 extern int flag_check_memory_usage;
555 /* Nonzero if GCC must prefix function names (used with
556 flag_check_memory_usage). */
558 extern int flag_prefix_function_name;
560 /* Value of the -G xx switch, and whether it was passed or not. */
561 extern int g_switch_value;
562 extern int g_switch_set;
564 /* Value of the -finline-limit flag. */
566 extern int inline_max_insns;
568 /* Values of the -falign-* flags: how much to align labels in code.
569 0 means `use default', 1 means `don't align'.
570 For each variable, there is an _log variant which is the power
571 of two not less than the variable, for .align output. */
573 extern int align_loops;
574 extern int align_loops_log;
575 extern int align_jumps;
576 extern int align_jumps_log;
577 extern int align_labels;
578 extern int align_labels_log;
579 extern int align_functions;
580 extern int align_functions_log;
582 /* Nonzero if we dump in VCG format, not plain text. */
583 extern int dump_for_graph;
585 /* Selection of the graph form. */
586 enum graph_dump_types
591 extern enum graph_dump_types graph_dump_format;
593 /* Nonzero means ignore `#ident' directives. 0 means handle them.
594 On SVR4 targets, it also controls whether or not to emit a
595 string identifying the compiler. */
597 extern int flag_no_ident;
599 /* Nonzero means we should do dwarf2 duplicate elimination. */
601 extern int flag_eliminate_dwarf2_dups;
603 /* Non-zero means to collect statistics which might be expensive
604 and to print them when we are done. */
605 extern int flag_detailed_statistics;
607 #endif /* GCC_FLAGS_H */