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