1/* Compilation switch flag definitions for GNU CC.
2   Copyright (C) 1987, 88, 94-98, 1999 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21/* Name of the input .c file being compiled.  */
22extern char *main_input_filename;
23
24enum debug_info_type
25{
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).  */
32};
33
34/* Specify which kind of debugging info to generate.  */
35extern enum debug_info_type write_symbols;
36
37enum debug_info_level
38{
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.  */
43};
44
45/* Specify how much debugging info to generate.  */
46extern enum debug_info_level debug_info_level;
47
48/* Nonzero means use GNU-only extensions in the generated symbolic
49   debugging information.  */
50extern int use_gnu_debug_info_extensions;
51
52/* Nonzero means do optimizations.  -opt.  */
53
54extern int optimize;
55
56/* Nonzero means optimize for size.  -Os.  */
57
58extern int optimize_size;
59
60/* Nonzero means do stupid register allocation.  -noreg.
61   Currently, this is 1 if `optimize' is 0.  */
62
63extern int obey_regdecls;
64
65/* Don't print functions as they are compiled and don't print
66   times taken by the various passes.  -quiet.  */
67
68extern int quiet_flag;
69
70/* Don't print warning messages.  -w.  */
71
72extern int inhibit_warnings;
73
74/* Do print extra warnings (such as for uninitialized variables).  -W.  */
75
76extern int extra_warnings;
77
78/* Nonzero to warn about unused local variables.  */
79
80extern int warn_unused;
81
82/* Nonzero means warn if inline function is too large.  */
83
84extern int warn_inline;
85
86/* Nonzero to warn about variables used before they are initialized.  */
87
88extern int warn_uninitialized;
89
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
94   pragmas.  */
95
96extern int warn_unknown_pragmas;
97
98/* Nonzero means warn about all declarations which shadow others.   */
99
100extern int warn_shadow;
101
102/* Warn if a switch on an enum fails to have a case for every enum value.  */
103
104extern int warn_switch;
105
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.  */
108
109extern int warn_return_type;
110
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).  */
114
115extern int warn_cast_align;
116
117/* Nonzero means warn that dbx info for template class methods isn't fully
118   supported yet.  */
119
120extern int warn_template_debugging;
121
122/* Nonzero means warn about any identifiers that match in the first N
123   characters.  The value N is in `id_clash_len'.  */
124
125extern int warn_id_clash;
126extern unsigned id_clash_len;
127
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'.  */
131
132extern int warn_larger_than;
133extern unsigned larger_than_size;
134
135/* Warn if a function returns an aggregate,
136   since there are often incompatible calling conventions for doing this.  */
137
138extern int warn_aggregate_return;
139
140/* Nonzero if generating code to do profiling.  */
141
142extern int profile_flag;
143
144/* Nonzero if generating code to do profiling on the basis of basic blocks.  */
145
146extern int profile_block_flag;
147
148/* Nonzero if generating code to profile program flow graph arcs. */
149
150extern int profile_arc_flag;
151
152/* Nonzero if generating info for gcov to calculate line test coverage. */
153
154extern int flag_test_coverage;
155
156/* Nonzero indicates that branch taken probabilities should be calculated. */
157
158extern int flag_branch_probabilities;
159
160/* Nonzero for -pedantic switch: warn about anything
161   that standard C forbids.  */
162
163extern int pedantic;
164
165/* Temporarily suppress certain warnings.
166   This is set while reading code from a system header file.  */
167
168extern int in_system_header;
169
170/* Nonzero for -dp: annotate the assembly with a comment describing the
171   pattern and alternative used.  */
172
173extern int flag_print_asm_name;
174
175/* Now the symbols that are set with `-f' switches.  */
176
177/* Nonzero means `char' should be signed.  */
178
179extern int flag_signed_char;
180
181/* Nonzero means give an enum type only as many bytes as it needs.  */
182
183extern int flag_short_enums;
184
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.  */
188
189extern int flag_caller_saves;
190
191/* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
192
193extern int flag_pcc_struct_return;
194
195/* Nonzero for -fforce-mem: load memory value into a register
196   before arithmetic on it.  This makes better cse but slower compilation.  */
197
198extern int flag_force_mem;
199
200/* Nonzero for -fforce-addr: load memory address into a register before
201   reference to memory.  This makes better cse but slower compilation.  */
202
203extern int flag_force_addr;
204
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.  */
207
208extern int flag_defer_pop;
209
210/* Nonzero for -ffloat-store: don't allocate floats and doubles
211   in extended-precision registers.  */
212
213extern int flag_float_store;
214
215/* Nonzero enables strength-reduction in loop.c.  */
216
217extern int flag_strength_reduce;
218
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
222   unrolled.  */
223
224extern int flag_unroll_loops;
225
226/* Nonzero enables loop unrolling in unroll.c.  All loops are unrolled.
227   This is generally not a win.  */
228
229extern int flag_unroll_all_loops;
230
231/* Nonzero forces all invariant computations in loops to be moved
232   outside the loop. */
233
234extern int flag_move_all_movables;
235
236/* Nonzero forces all general induction variables in loops to be
237   strength reduced. */
238
239extern int flag_reduce_all_givs;
240
241/* Nonzero for -fcse-follow-jumps:
242   have cse follow jumps to do a more extensive job.  */
243
244extern int flag_cse_follow_jumps;
245
246/* Nonzero for -fcse-skip-blocks:
247   have cse follow a branch around a block.  */
248
249extern int flag_cse_skip_blocks;
250
251/* Nonzero for -fexpensive-optimizations:
252   perform miscellaneous relatively-expensive optimizations.  */
253extern int flag_expensive_optimizations;
254
255/* Nonzero for -fwritable-strings:
256   store string constants in data segment and don't uniquize them.  */
257
258extern int flag_writable_strings;
259
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.  */
263
264extern int flag_no_function_cse;
265
266/* Nonzero for -fomit-frame-pointer:
267   don't make a frame pointer in simple functions that don't require one.  */
268
269extern int flag_omit_frame_pointer;
270
271/* Nonzero to inhibit use of define_optimization peephole opts.  */
272
273extern int flag_no_peephole;
274
275/* Nonzero means all references through pointers are volatile.  */
276
277extern int flag_volatile;
278
279/* Nonzero means treat all global and extern variables as volatile.  */
280
281extern int flag_volatile_global;
282
283/* Nonzero means treat all static variables as volatile.  */
284
285extern int flag_volatile_static;
286
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. */
291
292extern int flag_fast_math;
293
294/* Nonzero means the front end generally wants `errno' maintained by math
295   operations, like built-in SQRT, unless overridden by flag_fast_math.  */
296
297extern int flag_errno_math;
298
299/* 0 means straightforward implementation of complex divide acceptable.
300   1 means wide ranges of inputs must work for complex divide.
301   2 means C9X-like requirements for complex divide (not yet implemented).  */
302
303extern int flag_complex_divide_method;
304
305/* Nonzero means to run loop optimizations twice.  */
306
307extern int flag_rerun_loop_opt;
308
309/* Nonzero means make functions that look like good inline candidates
310   go inline.  */
311
312extern int flag_inline_functions;
313
314/* Nonzero for -fkeep-inline-functions: even if we make a function
315   go inline everywhere, keep its definition around for debugging
316   purposes.  */
317
318extern int flag_keep_inline_functions;
319
320/* Nonzero means that functions declared `inline' will be treated
321   as `static'.  Prevents generation of zillions of copies of unused
322   static inline functions; instead, `inlines' are written out
323   only when actually used.  Used in conjunction with -g.  Also
324   does the right thing with #pragma interface.  */
325
326extern int flag_no_inline;
327
328/* Nonzero if we are only using compiler to check syntax errors.  */
329
330extern int flag_syntax_only;
331
332/* Nonzero means we should save auxiliary info into a .X file.  */
333
334extern int flag_gen_aux_info;
335
336/* Nonzero means make the text shared if supported.  */
337
338extern int flag_shared_data;
339
340/* flag_schedule_insns means schedule insns within basic blocks (before
341   local_alloc).
342   flag_schedule_insns_after_reload means schedule insns after
343   global_alloc.  */
344
345extern int flag_schedule_insns;
346extern int flag_schedule_insns_after_reload;
347
348#ifdef HAIFA
349/* The following flags have effect only for scheduling before register
350   allocation:
351
352   flag_schedule_interblock means schedule insns accross basic blocks.
353   flag_schedule_speculative means allow speculative motion of non-load insns.
354   flag_schedule_speculative_load means allow speculative motion of some
355   load insns.
356   flag_schedule_speculative_load_dangerous allows speculative motion of more
357   load insns.  */
358
359extern int flag_schedule_interblock;
360extern int flag_schedule_speculative;
361extern int flag_schedule_speculative_load;
362extern int flag_schedule_speculative_load_dangerous;
363#endif  /* HAIFA */
364
365/* flag_on_branch_count_reg means try to replace add-1,compare,branch tupple
366   by a cheaper branch, on a count register. */
367extern int flag_branch_on_count_reg;
368
369
370/* Nonzero means put things in delayed-branch slots if supported. */
371
372extern int flag_delayed_branch;
373
374/* Nonzero means suppress output of instruction numbers and line number
375   notes in debugging dumps.  */
376
377extern int flag_dump_unnumbered;
378
379/* Nonzero means pretend it is OK to examine bits of target floats,
380   even if that isn't true.  The resulting code will have incorrect constants,
381   but the same series of instructions that the native compiler would make.  */
382
383extern int flag_pretend_float;
384
385/* Nonzero means change certain warnings into errors.
386   Usually these are warnings about failure to conform to some standard.  */
387
388extern int flag_pedantic_errors;
389
390/* Nonzero means generate position-independent code.
391   This is not fully implemented yet.  */
392
393extern int flag_pic;
394
395/* Nonzero means generate extra code for exception handling and enable
396   exception handling.  */
397
398extern int flag_exceptions;
399
400/* Nonzero means use the new model for exception handling. Replaces
401   -DNEW_EH_MODEL as a compile option. */
402
403extern int flag_new_exceptions;
404
405/* Nonzero means don't place uninitialized global data in common storage
406   by default.  */
407
408extern int flag_no_common;
409
410/* -finhibit-size-directive inhibits output of .size for ELF.
411   This is used only for compiling crtstuff.c,
412   and it may be extended to other effects
413   needed for crtstuff.c on other systems.  */
414extern int flag_inhibit_size_directive;
415
416/* Nonzero means place each function into its own section on those platforms
417   which support arbitrary section names and unlimited numbers of sections.  */
418
419extern int flag_function_sections;
420
421/* ... and similar for data.  */
422
423extern int flag_data_sections;
424
425/* -fverbose-asm causes extra commentary information to be produced in
426   the generated assembly code (to make it more readable).  This option
427   is generally only of use to those who actually need to read the
428   generated assembly code (perhaps while debugging the compiler itself).
429   -fno-verbose-asm, the default, causes the extra information
430   to not be added and is useful when comparing two assembler files.  */
431
432extern int flag_verbose_asm;
433
434/* -dA causes debug 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   Currently, this switch is only used by dwarfout.c; however, it is intended
439   to be a catchall for printing debug information in the assembler file.  */
440
441extern int flag_debug_asm;
442
443/* -fgnu-linker specifies use of the GNU linker for initializations.
444   -fno-gnu-linker says that collect will be used.  */
445extern int flag_gnu_linker;
446
447/* Tag all structures with __attribute__(packed) */
448extern int flag_pack_struct;
449
450/* This flag is only tested if alias checking is enabled.
451   0 if pointer arguments may alias each other.  True in C.
452   1 if pointer arguments may not alias each other but may alias
453   global variables.
454   2 if pointer arguments may not alias each other and may not
455   alias global variables.  True in Fortran.
456   The value is ignored if flag_alias_check is 0.  */
457extern int flag_argument_noalias;
458
459/* Nonzero if we should do (language-dependent) alias analysis.
460   Typically, this analysis will assume that expressions of certain
461   types do not alias expressions of certain other types.  Only used
462   if alias analysis (in general) is enabled.  */
463extern int flag_strict_aliasing;
464
465/* Emit code to check for stack overflow; also may cause large objects
466   to be allocated dynamically.  */
467extern int flag_stack_check;
468
469/* Do the full regmove optimization pass.  */
470extern int flag_regmove;
471
472/* Instrument functions with calls at entry and exit, for profiling.  */
473extern int flag_instrument_function_entry_exit;
474
475/* Other basic status info about current function.  */
476
477/* Nonzero means current function must be given a frame pointer.
478   Set in stmt.c if anything is allocated on the stack there.
479   Set in reload1.c if anything is allocated on the stack there.  */
480
481extern int frame_pointer_needed;
482
483/* Set nonzero if jump_optimize finds that control falls through
484   at the end of the function.  */
485
486extern int can_reach_end;
487
488/* Nonzero if function being compiled receives nonlocal gotos
489   from nested functions.  */
490
491extern int current_function_has_nonlocal_label;
492
493/* Nonzero if function being compiled has nonlocal gotos to parent
494   function.  */
495
496extern int current_function_has_nonlocal_goto;
497
498/* Nonzero if this function has a computed goto.
499
500   It is computed during find_basic_blocks or during stupid life
501   analysis.  */
502
503extern int current_function_has_computed_jump;
504
505/* Nonzero if GCC must add code to check memory access (used by Checker).  */
506
507extern int flag_check_memory_usage;
508
509/* Nonzero if GCC must prefix function names (used with
510   flag_check_memory_usage).  */
511
512extern int flag_prefix_function_name;
513/* Nonzero if the current function is a thunk, so we should try to cut
514   corners where we can.  */
515extern int current_function_is_thunk;
516
517/* Value of the -G xx switch, and whether it was passed or not.  */
518extern int g_switch_value;
519extern int g_switch_set;
520
521/* Value of the -finline-limit flag.  */
522
523extern int inline_max_insns;
524
525/* Nonzero if we dump in VCG format, not plain text.  */
526extern int dump_for_graph;
527
528/* Selection of the graph form.  */
529enum graph_dump_types
530{
531  no_graph = 0,
532  vcg
533};
534extern enum graph_dump_types graph_dump_format;
535
536/* Nonzero means ignore `#ident' directives.  0 means handle them.
537   On SVR4 targets, it also controls whether or not to emit a
538   string identifying the compiler.  */
539
540extern int flag_no_ident;
541