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 /* Nonzero if generating code to do profiling. */
165 extern int profile_flag;
167 /* Nonzero if generating code to do profiling on the basis of basic blocks. */
169 extern int profile_block_flag;
171 /* Nonzero if generating code to profile program flow graph arcs. */
173 extern int profile_arc_flag;
175 /* Nonzero if generating info for gcov to calculate line test coverage. */
177 extern int flag_test_coverage;
179 /* Nonzero indicates that branch taken probabilities should be calculated. */
181 extern int flag_branch_probabilities;
183 /* Nonzero for -pedantic switch: warn about anything
184 that standard C forbids. */
188 /* Temporarily suppress certain warnings.
189 This is set while reading code from a system header file. */
191 extern int in_system_header;
193 /* Nonzero for -dp: annotate the assembly with a comment describing the
194 pattern and alternative used. */
196 extern int flag_print_asm_name;
198 /* Now the symbols that are set with `-f' switches. */
200 /* Nonzero means `char' should be signed. */
202 extern int flag_signed_char;
204 /* Nonzero means give an enum type only as many bytes as it needs. */
206 extern int flag_short_enums;
208 /* Nonzero for -fcaller-saves: allocate values in regs that need to
209 be saved across function calls, if that produces overall better code.
210 Optional now, so people can test it. */
212 extern int flag_caller_saves;
214 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
216 extern int flag_pcc_struct_return;
218 /* Nonzero for -fforce-mem: load memory value into a register
219 before arithmetic on it. This makes better cse but slower compilation. */
221 extern int flag_force_mem;
223 /* Nonzero for -fforce-addr: load memory address into a register before
224 reference to memory. This makes better cse but slower compilation. */
226 extern int flag_force_addr;
228 /* Nonzero for -fdefer-pop: don't pop args after each function call;
229 instead save them up to pop many calls' args with one insns. */
231 extern int flag_defer_pop;
233 /* Nonzero for -ffloat-store: don't allocate floats and doubles
234 in extended-precision registers. */
236 extern int flag_float_store;
238 /* Nonzero enables strength-reduction in loop.c. */
240 extern int flag_strength_reduce;
242 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
243 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
244 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
247 extern int flag_unroll_loops;
249 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
250 This is generally not a win. */
252 extern int flag_unroll_all_loops;
254 /* Nonzero forces all invariant computations in loops to be moved
257 extern int flag_move_all_movables;
259 /* Nonzero forces all general induction variables in loops to be
262 extern int flag_reduce_all_givs;
264 /* Nonzero for -fcse-follow-jumps:
265 have cse follow jumps to do a more extensive job. */
267 extern int flag_cse_follow_jumps;
269 /* Nonzero for -fcse-skip-blocks:
270 have cse follow a branch around a block. */
272 extern int flag_cse_skip_blocks;
274 /* Nonzero for -fexpensive-optimizations:
275 perform miscellaneous relatively-expensive optimizations. */
276 extern int flag_expensive_optimizations;
278 /* Nonzero for -fwritable-strings:
279 store string constants in data segment and don't uniquize them. */
281 extern int flag_writable_strings;
283 /* Nonzero means don't put addresses of constant functions in registers.
284 Used for compiling the Unix kernel, where strange substitutions are
285 done on the assembly output. */
287 extern int flag_no_function_cse;
289 /* Nonzero for -fomit-frame-pointer:
290 don't make a frame pointer in simple functions that don't require one. */
292 extern int flag_omit_frame_pointer;
294 /* Nonzero to inhibit use of define_optimization peephole opts. */
296 extern int flag_no_peephole;
298 /* Nonzero means all references through pointers are volatile. */
300 extern int flag_volatile;
302 /* Nonzero means treat all global and extern variables as volatile. */
304 extern int flag_volatile_global;
306 /* Nonzero means treat all static variables as volatile. */
308 extern int flag_volatile_static;
310 /* Nonzero allows GCC to violate some IEEE or ANSI rules regarding math
311 operations in the interest of optimization. For example it allows
312 GCC to assume arguments to sqrt are nonnegative numbers, allowing
313 faster code for sqrt to be generated. */
315 extern int flag_fast_math;
317 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
319 extern int flag_optimize_sibling_calls;
321 /* Nonzero means the front end generally wants `errno' maintained by math
322 operations, like built-in SQRT, unless overridden by flag_fast_math. */
324 extern int flag_errno_math;
326 /* 0 means straightforward implementation of complex divide acceptable.
327 1 means wide ranges of inputs must work for complex divide.
328 2 means C9X-like requirements for complex divide (not yet implemented). */
330 extern int flag_complex_divide_method;
332 /* Nonzero means to run loop optimizations twice. */
334 extern int flag_rerun_loop_opt;
336 /* Nonzero means make functions that look like good inline candidates
339 extern int flag_inline_functions;
341 /* Nonzero for -fkeep-inline-functions: even if we make a function
342 go inline everywhere, keep its definition around for debugging
345 extern int flag_keep_inline_functions;
347 /* Nonzero means that functions declared `inline' will be treated
348 as `static'. Prevents generation of zillions of copies of unused
349 static inline functions; instead, `inlines' are written out
350 only when actually used. Used in conjunction with -g. Also
351 does the right thing with #pragma interface. */
353 extern int flag_no_inline;
355 /* Nonzero if we are only using compiler to check syntax errors. */
357 extern int flag_syntax_only;
359 /* Nonzero means we should save auxiliary info into a .X file. */
361 extern int flag_gen_aux_info;
363 /* Nonzero means make the text shared if supported. */
365 extern int flag_shared_data;
367 /* flag_schedule_insns means schedule insns within basic blocks (before
369 flag_schedule_insns_after_reload means schedule insns after
372 extern int flag_schedule_insns;
373 extern int flag_schedule_insns_after_reload;
375 /* The following flags have effect only for scheduling before register
378 flag_schedule_interblock means schedule insns accross basic blocks.
379 flag_schedule_speculative means allow speculative motion of non-load insns.
380 flag_schedule_speculative_load means allow speculative motion of some
382 flag_schedule_speculative_load_dangerous allows speculative motion of more
385 extern int flag_schedule_interblock;
386 extern int flag_schedule_speculative;
387 extern int flag_schedule_speculative_load;
388 extern int flag_schedule_speculative_load_dangerous;
390 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
391 by a cheaper branch, on a count register. */
392 extern int flag_branch_on_count_reg;
394 /* This option is set to 1 on -fsingle-precision-constant option which is
395 used to convert the floating point constants to single precision
398 extern int flag_single_precision_constant;
400 /* Nonzero means put things in delayed-branch slots if supported. */
402 extern int flag_delayed_branch;
404 /* Nonzero means suppress output of instruction numbers and line number
405 notes in debugging dumps. */
407 extern int flag_dump_unnumbered;
409 /* Nonzero means pretend it is OK to examine bits of target floats,
410 even if that isn't true. The resulting code will have incorrect constants,
411 but the same series of instructions that the native compiler would make. */
413 extern int flag_pretend_float;
415 /* Nonzero means change certain warnings into errors.
416 Usually these are warnings about failure to conform to some standard. */
418 extern int flag_pedantic_errors;
420 /* Nonzero means generate position-independent code.
421 This is not fully implemented yet. */
425 /* Nonzero means generate extra code for exception handling and enable
426 exception handling. */
428 extern int flag_exceptions;
430 /* Nonzero means use the new model for exception handling. Replaces
431 -DNEW_EH_MODEL as a compile option. */
433 extern int flag_new_exceptions;
435 /* Nonzero means generate frame unwind info table when supported */
437 extern int flag_unwind_tables;
439 /* Nonzero means don't place uninitialized global data in common storage
442 extern int flag_no_common;
444 /* -finhibit-size-directive inhibits output of .size for ELF.
445 This is used only for compiling crtstuff.c,
446 and it may be extended to other effects
447 needed for crtstuff.c on other systems. */
448 extern int flag_inhibit_size_directive;
450 /* Nonzero means place each function into its own section on those platforms
451 which support arbitrary section names and unlimited numbers of sections. */
453 extern int flag_function_sections;
455 /* ... and similar for data. */
457 extern int flag_data_sections;
459 /* -fverbose-asm causes extra commentary information to be produced in
460 the generated assembly code (to make it more readable). This option
461 is generally only of use to those who actually need to read the
462 generated assembly code (perhaps while debugging the compiler itself).
463 -fno-verbose-asm, the default, causes the extra information
464 to not be added and is useful when comparing two assembler files. */
466 extern int flag_verbose_asm;
468 /* -dA causes debug information to be produced in
469 the generated assembly code (to make it more readable). This option
470 is generally only of use to those who actually need to read the
471 generated assembly code (perhaps while debugging the compiler itself).
472 Currently, this switch is only used by dwarfout.c; however, it is intended
473 to be a catchall for printing debug information in the assembler file. */
475 extern int flag_debug_asm;
477 /* -fgnu-linker specifies use of the GNU linker for initializations.
478 -fno-gnu-linker says that collect will be used. */
479 extern int flag_gnu_linker;
481 /* Tag all structures with __attribute__(packed) */
482 extern int flag_pack_struct;
484 /* This flag is only tested if alias checking is enabled.
485 0 if pointer arguments may alias each other. True in C.
486 1 if pointer arguments may not alias each other but may alias
488 2 if pointer arguments may not alias each other and may not
489 alias global variables. True in Fortran.
490 The value is ignored if flag_alias_check is 0. */
491 extern int flag_argument_noalias;
493 /* Nonzero if we should do (language-dependent) alias analysis.
494 Typically, this analysis will assume that expressions of certain
495 types do not alias expressions of certain other types. Only used
496 if alias analysis (in general) is enabled. */
497 extern int flag_strict_aliasing;
499 /* Emit code to probe the stack, to help detect stack overflow; also
500 may cause large objects to be allocated dynamically. */
501 extern int flag_stack_check;
503 /* Do the full regmove optimization pass. */
504 extern int flag_regmove;
506 /* Instrument functions with calls at entry and exit, for profiling. */
507 extern int flag_instrument_function_entry_exit;
509 /* Perform a peephole pass before sched2. */
510 extern int flag_peephole2;
512 /* -fbounded-pointers causes gcc to compile pointers as composite
513 objects occupying three words: the pointer value, the base address
514 of the referent object, and the address immediately beyond the end
515 of the referent object. The base and extent allow us to perform
516 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
517 extern int flag_bounded_pointers;
519 /* -fcheck-bounds causes gcc to generate array bounds checks.
520 For C, C++: defaults to value of flag_bounded_pointers.
521 For ObjC: defaults to off.
522 For Java: defaults to on.
523 For Fortran: defaults to off.
524 For CHILL: defaults to off. */
525 extern int flag_bounds_check;
527 /* If one, renumber instruction UIDs to reduce the number of
528 unused UIDs if there are a lot of instructions. If greater than
529 one, unconditionally renumber instruction UIDs. */
530 extern int flag_renumber_insns;
532 /* Other basic status info about current function. */
534 /* Nonzero means current function must be given a frame pointer.
535 Set in stmt.c if anything is allocated on the stack there.
536 Set in reload1.c if anything is allocated on the stack there. */
538 extern int frame_pointer_needed;
540 /* Set nonzero if jump_optimize finds that control falls through
541 at the end of the function. */
543 extern int can_reach_end;
545 /* Nonzero if GCC must add code to check memory access (used by Checker). */
547 extern int flag_check_memory_usage;
549 /* Nonzero if GCC must prefix function names (used with
550 flag_check_memory_usage). */
552 extern int flag_prefix_function_name;
554 /* Value of the -G xx switch, and whether it was passed or not. */
555 extern int g_switch_value;
556 extern int g_switch_set;
558 /* Value of the -finline-limit flag. */
560 extern int inline_max_insns;
562 /* Values of the -falign-* flags: how much to align labels in code.
563 0 means `use default', 1 means `don't align'.
564 For each variable, there is an _log variant which is the power
565 of two not less than the variable, for .align output. */
567 extern int align_loops;
568 extern int align_loops_log;
569 extern int align_jumps;
570 extern int align_jumps_log;
571 extern int align_labels;
572 extern int align_labels_log;
573 extern int align_functions;
574 extern int align_functions_log;
576 /* Nonzero if we dump in VCG format, not plain text. */
577 extern int dump_for_graph;
579 /* Selection of the graph form. */
580 enum graph_dump_types
585 extern enum graph_dump_types graph_dump_format;
587 /* Nonzero means ignore `#ident' directives. 0 means handle them.
588 On SVR4 targets, it also controls whether or not to emit a
589 string identifying the compiler. */
591 extern int flag_no_ident;
593 /* Nonzero means we should do dwarf2 duplicate elimination. */
595 extern int flag_eliminate_dwarf2_dups;
597 /* Non-zero means to collect statistics which might be expensive
598 and to print them when we are done. */
599 extern int flag_detailed_statistics;
601 #endif /* GCC_FLAGS_H */