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Commit | Line | Data |
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d7b42618 | 1 | ; Options for the language- and target-independent parts of the compiler. |
50431bc4 | 2 | |
e53a16e7 | 3 | ; Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
d7b42618 NB |
4 | ; |
5 | ; This file is part of GCC. | |
6 | ; | |
7 | ; GCC is free software; you can redistribute it and/or modify it under | |
8 | ; the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 9 | ; Software Foundation; either version 3, or (at your option) any later |
d7b42618 | 10 | ; version. |
c22cacf3 | 11 | ; |
d7b42618 NB |
12 | ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | ; WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | ; for more details. | |
c22cacf3 | 16 | ; |
d7b42618 | 17 | ; You should have received a copy of the GNU General Public License |
9dcd6f09 NC |
18 | ; along with GCC; see the file COPYING3. If not see |
19 | ; <http://www.gnu.org/licenses/>. | |
d7b42618 | 20 | |
8abb6b22 | 21 | ; See the GCC internals manual for a description of this file's format. |
d7b42618 NB |
22 | |
23 | ; Please try to keep this file in ASCII collating order. | |
24 | ||
d185d268 NB |
25 | -help |
26 | Common | |
cf03fd63 | 27 | Display this information |
d185d268 | 28 | |
c662432e NC |
29 | -help= |
30 | Common Report Joined | |
31 | --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params | |
903caebf | 32 | |
d185d268 NB |
33 | -target-help |
34 | Common | |
c662432e NC |
35 | Alias for --help=target |
36 | ||
37 | ;; The following three entries are to work around the gcc driver | |
38 | ;; program's insatiable desire to turn options starting with a | |
39 | ;; double dash (--) into options starting with a dash f (-f). | |
40 | fhelp | |
41 | Common | |
42 | ||
43 | fhelp= | |
44 | Common Joined | |
45 | ||
46 | ftarget-help | |
47 | Common | |
48 | ||
49 | -param | |
50 | Common Separate | |
51 | --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters | |
d185d268 NB |
52 | |
53 | -version | |
54 | Common | |
55 | ||
56 | G | |
7b086b11 | 57 | Common Joined Separate UInteger |
cf03fd63 | 58 | -G<number> Put global and static data smaller than <number> bytes into a special section (on some targets) |
d185d268 | 59 | |
903caebf NB |
60 | O |
61 | Common JoinedOrMissing | |
cf03fd63 | 62 | -O<number> Set optimization level to <number> |
903caebf NB |
63 | |
64 | Os | |
65 | Common | |
cf03fd63 | 66 | Optimize for space rather than speed |
903caebf NB |
67 | |
68 | W | |
69 | Common RejectNegative | |
28786366 | 70 | This switch is deprecated; use -Wextra instead |
903caebf | 71 | |
e01cc6dc | 72 | Waggregate-return |
c662432e | 73 | Common Var(warn_aggregate_return) Warning |
28786366 | 74 | Warn about returning structures, unions or arrays |
e01cc6dc | 75 | |
590b1f2d | 76 | Warray-bounds |
21af5cdf | 77 | Common Var(warn_array_bounds) Warning |
590b1f2d DM |
78 | Warn if an array is accessed out of bounds |
79 | ||
5c498b10 | 80 | Wattributes |
c662432e | 81 | Common Var(warn_attributes) Init(1) Warning |
5c498b10 DD |
82 | Warn about inappropriate attribute usage |
83 | ||
e01cc6dc | 84 | Wcast-align |
c662432e | 85 | Common Var(warn_cast_align) Warning |
28786366 | 86 | Warn about pointer casts which increase alignment |
e01cc6dc NB |
87 | |
88 | Wdeprecated-declarations | |
c662432e | 89 | Common Var(warn_deprecated_decl) Init(1) Warning |
28786366 | 90 | Warn about uses of __attribute__((deprecated)) declarations |
e01cc6dc NB |
91 | |
92 | Wdisabled-optimization | |
c662432e | 93 | Common Var(warn_disabled_optimization) Warning |
28786366 | 94 | Warn when an optimization pass is disabled |
e01cc6dc NB |
95 | |
96 | Werror | |
50431bc4 | 97 | Common Var(warnings_are_errors) |
28786366 | 98 | Treat all warnings as errors |
e01cc6dc | 99 | |
79cf5994 DD |
100 | Werror= |
101 | Common Joined | |
102 | Treat specified warning as error | |
103 | ||
903caebf | 104 | Wextra |
c662432e | 105 | Common Warning |
cf03fd63 | 106 | Print extra (possibly unwanted) warnings |
903caebf | 107 | |
c65a01af | 108 | Wfatal-errors |
50431bc4 | 109 | Common Var(flag_fatal_errors) |
c65a01af RG |
110 | Exit on the first error occurred |
111 | ||
e01cc6dc | 112 | Winline |
c662432e | 113 | Common Var(warn_inline) Warning |
28786366 | 114 | Warn when an inlined function cannot be inlined |
e01cc6dc NB |
115 | |
116 | Wlarger-than- | |
c662432e | 117 | Common RejectNegative Joined UInteger Warning |
cf03fd63 | 118 | -Wlarger-than-<number> Warn if an object is larger than <number> bytes |
e01cc6dc | 119 | |
63a08740 DM |
120 | Wlogical-op |
121 | Common Warning Var(warn_logical_op) | |
122 | Warn when a logical operator is suspicously always evaluating to true or false | |
123 | ||
f9cc1a70 | 124 | Wunsafe-loop-optimizations |
c662432e | 125 | Common Var(warn_unsafe_loop_optimizations) Warning |
f9cc1a70 PB |
126 | Warn if the loop cannot be optimized due to nontrivial assumptions. |
127 | ||
e01cc6dc | 128 | Wmissing-noreturn |
c662432e | 129 | Common Var(warn_missing_noreturn) Warning |
28786366 | 130 | Warn about functions which might be candidates for __attribute__((noreturn)) |
e01cc6dc | 131 | |
71834ad3 | 132 | Woverflow |
c662432e | 133 | Common Var(warn_overflow) Init(1) Warning |
71834ad3 RS |
134 | Warn about overflow in arithmetic expressions |
135 | ||
e01cc6dc | 136 | Wpacked |
c662432e | 137 | Common Var(warn_packed) Warning |
28786366 | 138 | Warn when the packed attribute has no effect on struct layout |
e01cc6dc NB |
139 | |
140 | Wpadded | |
c662432e | 141 | Common Var(warn_padded) Warning |
28786366 | 142 | Warn when padding is required to align structure members |
e01cc6dc NB |
143 | |
144 | Wshadow | |
c662432e | 145 | Common Var(warn_shadow) Warning |
28786366 | 146 | Warn when one local variable shadows another |
e01cc6dc | 147 | |
7d69de61 | 148 | Wstack-protector |
c662432e | 149 | Common Var(warn_stack_protect) Warning |
7d69de61 RH |
150 | Warn when not issuing stack smashing protection for some reason |
151 | ||
e01cc6dc | 152 | Wstrict-aliasing |
c662432e | 153 | Common Warning |
28786366 | 154 | Warn about code which might break strict aliasing rules |
e01cc6dc | 155 | |
5399d643 | 156 | Wstrict-aliasing= |
c662432e | 157 | Common Joined UInteger Warning |
5399d643 JW |
158 | Warn about code which might break strict aliasing rules |
159 | ||
6ac01510 | 160 | Wstrict-overflow |
21af5cdf | 161 | Common Warning |
6ac01510 ILT |
162 | Warn about optimizations that assume that signed overflow is undefined |
163 | ||
164 | Wstrict-overflow= | |
21af5cdf | 165 | Common Joined UInteger Warning |
6ac01510 ILT |
166 | Warn about optimizations that assume that signed overflow is undefined |
167 | ||
e01cc6dc | 168 | Wswitch |
c662432e | 169 | Common Var(warn_switch) Warning |
28786366 | 170 | Warn about enumerated switches, with no default, missing a case |
e01cc6dc NB |
171 | |
172 | Wswitch-default | |
c662432e | 173 | Common Var(warn_switch_default) Warning |
28786366 | 174 | Warn about enumerated switches missing a \"default:\" statement |
e01cc6dc NB |
175 | |
176 | Wswitch-enum | |
c662432e | 177 | Common Var(warn_switch_enum) Warning |
28786366 | 178 | Warn about all enumerated switches missing a specific case |
e01cc6dc NB |
179 | |
180 | Wsystem-headers | |
c662432e | 181 | Common Var(warn_system_headers) Warning |
f3fdaec4 | 182 | Do not suppress warnings from system headers |
e01cc6dc NB |
183 | |
184 | Wuninitialized | |
c662432e | 185 | Common Var(warn_uninitialized) Warning |
28786366 | 186 | Warn about uninitialized automatic variables |
e01cc6dc NB |
187 | |
188 | Wunreachable-code | |
c662432e | 189 | Common Var(warn_notreached) Warning |
28786366 | 190 | Warn about code that will never be executed |
e01cc6dc | 191 | |
903caebf | 192 | Wunused |
c662432e | 193 | Common Warning |
cf03fd63 | 194 | Enable all -Wunused- warnings |
903caebf | 195 | |
e01cc6dc | 196 | Wunused-function |
c662432e | 197 | Common Var(warn_unused_function) Warning |
28786366 | 198 | Warn when a function is unused |
e01cc6dc NB |
199 | |
200 | Wunused-label | |
c662432e | 201 | Common Var(warn_unused_label) Warning |
28786366 | 202 | Warn when a label is unused |
e01cc6dc NB |
203 | |
204 | Wunused-parameter | |
c662432e | 205 | Common Var(warn_unused_parameter) Warning |
28786366 | 206 | Warn when a function parameter is unused |
e01cc6dc NB |
207 | |
208 | Wunused-value | |
c662432e | 209 | Common Var(warn_unused_value) Warning |
28786366 | 210 | Warn when an expression value is unused |
e01cc6dc NB |
211 | |
212 | Wunused-variable | |
c662432e | 213 | Common Var(warn_unused_variable) Warning |
28786366 | 214 | Warn when a variable is unused |
e01cc6dc | 215 | |
d35a40fc | 216 | Wvolatile-register-var |
c662432e | 217 | Common Var(warn_register_var) Warning |
d35a40fc DE |
218 | Warn when a register variable is declared volatile |
219 | ||
16c1c158 | 220 | Wcoverage-mismatch |
21af5cdf | 221 | Common RejectNegative Var(warn_coverage_mismatch) Warning |
16c1c158 RG |
222 | Warn instead of error in case profiles in -fprofile-use do not match |
223 | ||
d185d268 NB |
224 | aux-info |
225 | Common Separate | |
cf03fd63 | 226 | -aux-info <file> Emit declaration information into <file> |
d185d268 NB |
227 | |
228 | aux-info= | |
229 | Common Joined | |
230 | ||
231 | auxbase | |
232 | Common Separate | |
233 | ||
234 | auxbase-strip | |
235 | Common Separate | |
236 | ||
237 | d | |
238 | Common Joined | |
cf03fd63 | 239 | -d<letters> Enable dumps from specific passes of the compiler |
d185d268 NB |
240 | |
241 | dumpbase | |
242 | Common Separate | |
cf03fd63 | 243 | -dumpbase <file> Set the file basename to be used for dumps |
d185d268 | 244 | |
31b66477 KC |
245 | ; The version of the C++ ABI in use. The following values are allowed: |
246 | ; | |
247 | ; 0: The version of the ABI believed most conformant with the C++ ABI | |
248 | ; specification. This ABI may change as bugs are discovered and fixed. | |
249 | ; Therefore, 0 will not necessarily indicate the same ABI in different | |
250 | ; versions of G++. | |
251 | ; | |
252 | ; 1: The version of the ABI first used in G++ 3.2. | |
253 | ; | |
99a8d35b ET |
254 | ; 2: The version of the ABI first used in G++ 3.4. |
255 | ; | |
31b66477 KC |
256 | ; Additional positive integers will be assigned as new versions of |
257 | ; the ABI become the default version of the ABI. | |
57782ad8 | 258 | fabi-version= |
50431bc4 | 259 | Common Joined UInteger Var(flag_abi_version) Init(2) |
57782ad8 | 260 | |
6ff3a151 | 261 | falign-functions |
50431bc4 | 262 | Common Report Var(align_functions,0) |
f3fdaec4 | 263 | Align the start of functions |
6ff3a151 | 264 | |
058de654 NB |
265 | falign-functions= |
266 | Common RejectNegative Joined UInteger | |
267 | ||
6ff3a151 | 268 | falign-jumps |
c662432e | 269 | Common Report Var(align_jumps,0) Optimization |
f3fdaec4 | 270 | Align labels which are only reached by jumping |
6ff3a151 | 271 | |
058de654 NB |
272 | falign-jumps= |
273 | Common RejectNegative Joined UInteger | |
274 | ||
6ff3a151 | 275 | falign-labels |
c662432e | 276 | Common Report Var(align_labels,0) Optimization |
f3fdaec4 | 277 | Align all labels |
6ff3a151 | 278 | |
058de654 NB |
279 | falign-labels= |
280 | Common RejectNegative Joined UInteger | |
281 | ||
6ff3a151 | 282 | falign-loops |
c662432e | 283 | Common Report Var(align_loops) Optimization |
f3fdaec4 | 284 | Align the start of loops |
6ff3a151 | 285 | |
058de654 NB |
286 | falign-loops= |
287 | Common RejectNegative Joined UInteger | |
288 | ||
31b66477 KC |
289 | ; This flag is only tested if alias checking is enabled. |
290 | ; 0 if pointer arguments may alias each other. True in C. | |
291 | ; 1 if pointer arguments may not alias each other but may alias | |
292 | ; global variables. | |
293 | ; 2 if pointer arguments may not alias each other and may not | |
0698a1d2 TM |
294 | ; alias global variables. |
295 | ; 3 if pointer arguments may not alias anything. True in Fortran. | |
296 | ; Set by the front end. | |
6ff3a151 | 297 | fargument-alias |
c662432e | 298 | Common Report Var(flag_argument_noalias,0) Optimization |
f3fdaec4 | 299 | Specify that arguments may alias each other and globals |
6ff3a151 NB |
300 | |
301 | fargument-noalias | |
c662432e | 302 | Common Report Var(flag_argument_noalias,1) VarExists Optimization |
f3fdaec4 | 303 | Assume arguments may alias globals but not each other |
6ff3a151 NB |
304 | |
305 | fargument-noalias-global | |
c662432e | 306 | Common Report Var(flag_argument_noalias,2) VarExists Optimization |
f3fdaec4 | 307 | Assume arguments alias neither each other nor globals |
6ff3a151 | 308 | |
0698a1d2 | 309 | fargument-noalias-anything |
c662432e | 310 | Common Report Var(flag_argument_noalias,3) VarExists Optimization |
0698a1d2 TM |
311 | Assume arguments alias no other storage |
312 | ||
6ff3a151 | 313 | fasynchronous-unwind-tables |
c662432e | 314 | Common Report Var(flag_asynchronous_unwind_tables) Optimization |
f3fdaec4 | 315 | Generate unwind tables that are exact at each instruction boundary |
6ff3a151 | 316 | |
6fb5fa3c DB |
317 | fauto-inc-dec |
318 | Common Report Var(flag_auto_inc_dec) Init(1) | |
319 | Generate auto-inc/dec instructions | |
320 | ||
31b66477 KC |
321 | ; -fcheck-bounds causes gcc to generate array bounds checks. |
322 | ; For C, C++ and ObjC: defaults off. | |
323 | ; For Java: defaults to on. | |
324 | ; For Fortran: defaults to off. | |
6ff3a151 | 325 | fbounds-check |
50431bc4 | 326 | Common Report Var(flag_bounds_check) |
f3fdaec4 | 327 | Generate code to check bounds before indexing arrays |
6ff3a151 NB |
328 | |
329 | fbranch-count-reg | |
c662432e | 330 | Common Report Var(flag_branch_on_count_reg) Init(1) Optimization |
f3fdaec4 | 331 | Replace add, compare, branch with branch on count register |
6ff3a151 NB |
332 | |
333 | fbranch-probabilities | |
c662432e | 334 | Common Report Var(flag_branch_probabilities) Optimization |
f3fdaec4 | 335 | Use profiling information for branch probabilities |
6ff3a151 | 336 | |
de32c0cb | 337 | fbranch-target-load-optimize |
c662432e | 338 | Common Report Var(flag_branch_target_load_optimize) Optimization |
f3fdaec4 | 339 | Perform branch target load optimization before prologue / epilogue threading |
de32c0cb NB |
340 | |
341 | fbranch-target-load-optimize2 | |
c662432e | 342 | Common Report Var(flag_branch_target_load_optimize2) Optimization |
f3fdaec4 | 343 | Perform branch target load optimization after prologue / epilogue threading |
de32c0cb | 344 | |
1194fc79 | 345 | fbtr-bb-exclusive |
c662432e | 346 | Common Report Var(flag_btr_bb_exclusive) Optimization |
1194fc79 R |
347 | Restrict target load migration not to re-use registers in any basic block |
348 | ||
058de654 NB |
349 | fcall-saved- |
350 | Common Joined RejectNegative | |
cf03fd63 | 351 | -fcall-saved-<register> Mark <register> as being preserved across functions |
058de654 NB |
352 | |
353 | fcall-used- | |
354 | Common Joined RejectNegative | |
cf03fd63 | 355 | -fcall-used-<register> Mark <register> as being corrupted by function calls |
058de654 | 356 | |
31b66477 KC |
357 | ; Nonzero for -fcaller-saves: allocate values in regs that need to |
358 | ; be saved across function calls, if that produces overall better code. | |
359 | ; Optional now, so people can test it. | |
de32c0cb | 360 | fcaller-saves |
c662432e | 361 | Common Report Var(flag_caller_saves) Optimization |
f3fdaec4 | 362 | Save registers around function calls |
de32c0cb | 363 | |
3d8864c0 SP |
364 | fcheck-data-deps |
365 | Common Report Var(flag_check_data_deps) | |
366 | Compare the results of several data dependence analyzers. | |
367 | ||
6ff3a151 | 368 | fcommon |
c662432e | 369 | Common Report Var(flag_no_common,0) Optimization |
f3fdaec4 | 370 | Do not put uninitialized globals in the common section |
6ff3a151 NB |
371 | |
372 | fcprop-registers | |
c662432e | 373 | Common Report Var(flag_cprop_registers) Optimization |
f3fdaec4 | 374 | Perform a register copy-propagation optimization pass |
6ff3a151 | 375 | |
de32c0cb | 376 | fcrossjumping |
c662432e | 377 | Common Report Var(flag_crossjumping) Optimization |
f3fdaec4 | 378 | Perform cross-jumping optimization |
de32c0cb NB |
379 | |
380 | fcse-follow-jumps | |
c662432e | 381 | Common Report Var(flag_cse_follow_jumps) Optimization |
f3fdaec4 | 382 | When running CSE, follow jumps to their targets |
de32c0cb NB |
383 | |
384 | fcse-skip-blocks | |
c662432e | 385 | Common Report Var(flag_cse_skip_blocks) Optimization |
f3fdaec4 | 386 | When running CSE, follow conditional jumps |
de32c0cb | 387 | |
c7463669 | 388 | fcx-limited-range |
c662432e | 389 | Common Report Var(flag_cx_limited_range) Optimization |
c7463669 RH |
390 | Omit range reduction step when performing complex division |
391 | ||
6ff3a151 | 392 | fdata-sections |
c662432e | 393 | Common Report Var(flag_data_sections) Optimization |
f3fdaec4 | 394 | Place data items into their own section |
6ff3a151 | 395 | |
0a090f42 SP |
396 | fdbg-cnt-list |
397 | Common Report | |
398 | List all available debugging counters with their limits and counts. | |
399 | ||
6fb5fa3c DB |
400 | fdbg-cnt= |
401 | Common RejectNegative Joined | |
0a090f42 | 402 | -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit. |
6fb5fa3c | 403 | |
c8aea42c PB |
404 | fdebug-prefix-map= |
405 | Common Joined RejectNegative | |
406 | Map one directory name to another in debug information | |
407 | ||
31b66477 KC |
408 | ; Nonzero for -fdefer-pop: don't pop args after each function call |
409 | ; instead save them up to pop many calls' args with one insns. | |
de32c0cb | 410 | fdefer-pop |
c662432e | 411 | Common Report Var(flag_defer_pop) Optimization |
f3fdaec4 | 412 | Defer popping functions args from stack until later |
de32c0cb NB |
413 | |
414 | fdelayed-branch | |
c662432e | 415 | Common Report Var(flag_delayed_branch) Optimization |
f3fdaec4 | 416 | Attempt to fill delay slots of branch instructions |
de32c0cb NB |
417 | |
418 | fdelete-null-pointer-checks | |
c662432e | 419 | Common Report Var(flag_delete_null_pointer_checks) Optimization |
f3fdaec4 | 420 | Delete useless null pointer checks |
de32c0cb NB |
421 | |
422 | fdiagnostics-show-location= | |
423 | Common Joined RejectNegative | |
cf03fd63 | 424 | -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics |
de32c0cb | 425 | |
ccf08a6e | 426 | fdiagnostics-show-option |
2098fe9e | 427 | Common |
c85ce869 | 428 | Amend appropriate diagnostic messages with the command line option that controls them |
ccf08a6e | 429 | |
6de9cd9a DN |
430 | fdump- |
431 | Common Joined RejectNegative | |
432 | -fdump-<type> Dump various compiler internals to a file | |
433 | ||
24a7799e R |
434 | fdump-noaddr |
435 | Common Report Var(flag_dump_noaddr) | |
436 | Suppress output of addresses in debugging dumps | |
437 | ||
6ff3a151 | 438 | fdump-unnumbered |
50431bc4 | 439 | Common Report Var(flag_dump_unnumbered) VarExists |
24a7799e | 440 | Suppress output of instruction numbers, line number notes and addresses in debugging dumps |
6ff3a151 | 441 | |
355866de | 442 | fearly-inlining |
c662432e | 443 | Common Report Var(flag_early_inlining) Init(1) Optimization |
355866de RG |
444 | Perform early inlining |
445 | ||
de32c0cb | 446 | feliminate-dwarf2-dups |
50431bc4 | 447 | Common Report Var(flag_eliminate_dwarf2_dups) |
f3fdaec4 | 448 | Perform DWARF2 duplicate elimination |
de32c0cb | 449 | |
6a08f7b3 | 450 | feliminate-unused-debug-symbols |
50431bc4 | 451 | Common Report Var(flag_debug_only_used_symbols) |
f3fdaec4 | 452 | Perform unused type elimination in debug info |
6a08f7b3 | 453 | |
de32c0cb | 454 | feliminate-unused-debug-types |
50431bc4 | 455 | Common Report Var(flag_eliminate_unused_debug_types) Init(1) |
f3fdaec4 | 456 | Perform unused type elimination in debug info |
de32c0cb | 457 | |
e713adf6 CD |
458 | femit-class-debug-always |
459 | Common Report Var(flag_emit_class_debug_always) Init(1) | |
460 | Do not suppress C++ class debug information. | |
461 | ||
6ff3a151 | 462 | fexceptions |
c662432e | 463 | Common Report Var(flag_exceptions) Optimization |
f3fdaec4 | 464 | Enable exception handling |
6ff3a151 | 465 | |
de32c0cb | 466 | fexpensive-optimizations |
c662432e | 467 | Common Report Var(flag_expensive_optimizations) Optimization |
f3fdaec4 | 468 | Perform a number of minor, expensive optimizations |
de32c0cb | 469 | |
058de654 NB |
470 | ffast-math |
471 | Common | |
472 | ||
6ff3a151 | 473 | ffinite-math-only |
c662432e | 474 | Common Report Var(flag_finite_math_only) Optimization |
f3fdaec4 | 475 | Assume no NaNs or infinities are generated |
6ff3a151 | 476 | |
058de654 NB |
477 | ffixed- |
478 | Common Joined RejectNegative | |
cf03fd63 | 479 | -ffixed-<register> Mark <register> as being unavailable to the compiler |
058de654 | 480 | |
de32c0cb | 481 | ffloat-store |
c662432e | 482 | Common Report Var(flag_float_store) Optimization |
31b66477 | 483 | Don't allocate floats and doubles in extended-precision registers |
de32c0cb | 484 | |
31b66477 KC |
485 | ; Nonzero for -fforce-addr: load memory address into a register before |
486 | ; reference to memory. This makes better cse but slower compilation. | |
de32c0cb | 487 | fforce-addr |
c662432e | 488 | Common Report Var(flag_force_addr) Optimization |
f3fdaec4 | 489 | Copy memory address constants into registers before use |
de32c0cb | 490 | |
2ca2b607 SB |
491 | fforward-propagate |
492 | Common Report Var(flag_forward_propagate) Optimization | |
a52b023a PB |
493 | Perform a forward propagation pass on RTL |
494 | ||
31b66477 KC |
495 | ; Nonzero means don't put addresses of constant functions in registers. |
496 | ; Used for compiling the Unix kernel, where strange substitutions are | |
497 | ; done on the assembly output. | |
de32c0cb | 498 | ffunction-cse |
50431bc4 | 499 | Common Report Var(flag_no_function_cse,0) |
f3fdaec4 | 500 | Allow function addresses to be held in registers |
de32c0cb | 501 | |
6ff3a151 | 502 | ffunction-sections |
50431bc4 | 503 | Common Report Var(flag_function_sections) |
f3fdaec4 | 504 | Place each function into its own section |
6ff3a151 | 505 | |
de32c0cb | 506 | fgcse |
c662432e | 507 | Common Report Var(flag_gcse) Optimization |
f3fdaec4 | 508 | Perform global common subexpression elimination |
de32c0cb NB |
509 | |
510 | fgcse-lm | |
c662432e | 511 | Common Report Var(flag_gcse_lm) Init(1) Optimization |
f3fdaec4 | 512 | Perform enhanced load motion during global common subexpression elimination |
de32c0cb NB |
513 | |
514 | fgcse-sm | |
c662432e | 515 | Common Report Var(flag_gcse_sm) Init(0) Optimization |
f3fdaec4 | 516 | Perform store motion after global common subexpression elimination |
de32c0cb | 517 | |
f5f2e3cd | 518 | fgcse-las |
c662432e | 519 | Common Report Var(flag_gcse_las) Init(0) Optimization |
f9957958 MH |
520 | Perform redundant load after store elimination in global common subexpression |
521 | elimination | |
522 | ||
523 | fgcse-after-reload | |
c662432e | 524 | Common Report Var(flag_gcse_after_reload) Optimization |
f9957958 | 525 | Perform global common subexpression elimination after register allocation |
c85ce869 | 526 | has finished |
f5f2e3cd | 527 | |
6ff3a151 | 528 | fguess-branch-probability |
c662432e | 529 | Common Report Var(flag_guess_branch_prob) Optimization |
f3fdaec4 | 530 | Enable guessing of branch probabilities |
6ff3a151 | 531 | |
31b66477 KC |
532 | ; Nonzero means ignore `#ident' directives. 0 means handle them. |
533 | ; Generate position-independent code for executables if possible | |
534 | ; On SVR4 targets, it also controls whether or not to emit a | |
535 | ; string identifying the compiler. | |
6ff3a151 | 536 | fident |
50431bc4 | 537 | Common Report Var(flag_no_ident,0) |
f3fdaec4 | 538 | Process #ident directives |
6ff3a151 | 539 | |
de32c0cb | 540 | fif-conversion |
c662432e | 541 | Common Report Var(flag_if_conversion) Optimization |
f3fdaec4 | 542 | Perform conversion of conditional jumps to branchless equivalents |
de32c0cb NB |
543 | |
544 | fif-conversion2 | |
c662432e | 545 | Common Report Var(flag_if_conversion2) Optimization |
f3fdaec4 | 546 | Perform conversion of conditional jumps to conditional execution |
de32c0cb | 547 | |
31b66477 KC |
548 | ; -finhibit-size-directive inhibits output of .size for ELF. |
549 | ; This is used only for compiling crtstuff.c, | |
550 | ; and it may be extended to other effects | |
551 | ; needed for crtstuff.c on other systems. | |
6ff3a151 | 552 | finhibit-size-directive |
50431bc4 | 553 | Common Report Var(flag_inhibit_size_directive) |
f3fdaec4 | 554 | Do not generate .size directives |
6ff3a151 | 555 | |
31b66477 KC |
556 | ; Nonzero means that functions declared `inline' will be treated |
557 | ; as `static'. Prevents generation of zillions of copies of unused | |
558 | ; static inline functions; instead, `inlines' are written out | |
559 | ; only when actually used. Used in conjunction with -g. Also | |
560 | ; does the right thing with #pragma interface. | |
de32c0cb | 561 | finline |
50431bc4 | 562 | Common Report Var(flag_no_inline,0) Init(2) |
f3fdaec4 | 563 | Pay attention to the \"inline\" keyword |
de32c0cb | 564 | |
4d4b8cb9 JH |
565 | finline-small-functions |
566 | Common Report Var(flag_inline_small_functions) Optimization | |
567 | Integrate simple functions into their callers when code size is known to not growth | |
568 | ||
de32c0cb | 569 | finline-functions |
c662432e | 570 | Common Report Var(flag_inline_functions) Optimization |
f3fdaec4 | 571 | Integrate simple functions into their callers |
de32c0cb | 572 | |
355866de | 573 | finline-functions-called-once |
c662432e | 574 | Common Report Var(flag_inline_functions_called_once) Init(1) Optimization |
355866de | 575 | Integrate functions called once into their callers |
d63db217 | 576 | |
d302c9d6 NB |
577 | finline-limit- |
578 | Common RejectNegative Joined UInteger | |
579 | ||
580 | finline-limit= | |
581 | Common RejectNegative Joined UInteger | |
cf03fd63 | 582 | -finline-limit=<number> Limit the size of inlined functions to <number> |
d302c9d6 | 583 | |
6ff3a151 | 584 | finstrument-functions |
50431bc4 | 585 | Common Report Var(flag_instrument_function_entry_exit) |
f3fdaec4 | 586 | Instrument function entry and exit with profiling calls |
6ff3a151 | 587 | |
8d5a7d1f ILT |
588 | finstrument-functions-exclude-function-list= |
589 | Common RejectNegative Joined | |
590 | -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions | |
591 | ||
592 | finstrument-functions-exclude-file-list= | |
593 | Common RejectNegative Joined | |
594 | -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files | |
595 | ||
d6e14e8f | 596 | fipa-cp |
c662432e | 597 | Common Report Var(flag_ipa_cp) Optimization |
d6e14e8f SB |
598 | Perform Interprocedural constant propagation |
599 | ||
ea900239 | 600 | fipa-pure-const |
c662432e | 601 | Common Report Var(flag_ipa_pure_const) Init(0) Optimization |
ea900239 DB |
602 | Discover pure and const functions |
603 | ||
4cf4d6a3 | 604 | fipa-pta |
c662432e | 605 | Common Report Var(flag_ipa_pta) Init(0) Optimization |
4cf4d6a3 DB |
606 | Perform interprocedural points-to analysis |
607 | ||
ea900239 | 608 | fipa-reference |
c662432e | 609 | Common Report Var(flag_ipa_reference) Init(0) Optimization |
ea900239 DB |
610 | Discover readonly and non addressable static variables |
611 | ||
612 | fipa-type-escape | |
c662432e | 613 | Common Report Var(flag_ipa_type_escape) Init(0) Optimization |
ea900239 DB |
614 | Type based escape and alias analysis |
615 | ||
43d861a5 | 616 | fipa-matrix-reorg |
6ae4be32 | 617 | Common Report Var(flag_ipa_matrix_reorg) Optimization |
43d861a5 RL |
618 | Perform matrix layout flattening and transposing based |
619 | on profiling information. | |
620 | ||
8b11a64c | 621 | fivopts |
c662432e | 622 | Common Report Var(flag_ivopts) Init(1) Optimization |
8b11a64c ZD |
623 | Optimize induction variables on trees |
624 | ||
82c0180d | 625 | fjump-tables |
c662432e | 626 | Common Var(flag_jump_tables) Init(1) Optimization |
82c0180d JM |
627 | Use jump tables for sufficiently large switch statements |
628 | ||
de32c0cb | 629 | fkeep-inline-functions |
50431bc4 | 630 | Common Report Var(flag_keep_inline_functions) |
f3fdaec4 | 631 | Generate code for functions even if they are fully inlined |
de32c0cb NB |
632 | |
633 | fkeep-static-consts | |
50431bc4 | 634 | Common Report Var(flag_keep_static_consts) Init(1) |
f3fdaec4 | 635 | Emit static const variables even if they are not used |
de32c0cb | 636 | |
6ff3a151 | 637 | fleading-underscore |
50431bc4 | 638 | Common Report Var(flag_leading_underscore) Init(-1) |
f3fdaec4 | 639 | Give external symbols a leading underscore |
6ff3a151 | 640 | |
efa1cdf0 ZD |
641 | floop-optimize |
642 | Common | |
c0220ea4 | 643 | Does nothing. Preserved for backward compatibility. |
efa1cdf0 | 644 | |
6ff3a151 | 645 | fmath-errno |
50431bc4 | 646 | Common Report Var(flag_errno_math) Init(1) |
f3fdaec4 | 647 | Set errno after built-in math functions |
6ff3a151 NB |
648 | |
649 | fmem-report | |
50431bc4 | 650 | Common Report Var(mem_report) |
f3fdaec4 | 651 | Report on permanent memory allocation |
6ff3a151 | 652 | |
31b66477 KC |
653 | ; This will attempt to merge constant section constants, if 1 only |
654 | ; string constants and constants from constant pool, if 2 also constant | |
655 | ; variables. | |
6ff3a151 | 656 | fmerge-all-constants |
c662432e | 657 | Common Report Var(flag_merge_constants,2) Init(1) Optimization |
f3fdaec4 | 658 | Attempt to merge identical constants and constant variables |
6ff3a151 NB |
659 | |
660 | fmerge-constants | |
c662432e | 661 | Common Report Var(flag_merge_constants,1) VarExists Optimization |
f3fdaec4 | 662 | Attempt to merge identical constants across compilation units |
6ff3a151 | 663 | |
de32c0cb NB |
664 | fmessage-length= |
665 | Common RejectNegative Joined UInteger | |
cf03fd63 | 666 | -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping |
de32c0cb | 667 | |
e5626198 | 668 | fmodulo-sched |
c662432e | 669 | Common Report Var(flag_modulo_sched) Optimization |
e5626198 AZ |
670 | Perform SMS based modulo scheduling before the first scheduling pass |
671 | ||
517d76fa VY |
672 | fmodulo-sched-allow-regmoves |
673 | Common Report Var(flag_modulo_sched_allow_regmoves) | |
674 | Perform SMS based modulo scheduling with register moves allowed | |
675 | ||
5e962776 | 676 | fmove-loop-invariants |
c662432e | 677 | Common Report Var(flag_move_loop_invariants) Init(1) Optimization |
5e962776 ZD |
678 | Move loop invariant computations out of loops |
679 | ||
6de9cd9a | 680 | fmudflap |
50431bc4 | 681 | Common RejectNegative Report Var(flag_mudflap) |
c85ce869 | 682 | Add mudflap bounds-checking instrumentation for single-threaded program |
6de9cd9a DN |
683 | |
684 | fmudflapth | |
110c4563 | 685 | Common RejectNegative Report VarExists Var(flag_mudflap,2) |
c85ce869 | 686 | Add mudflap bounds-checking instrumentation for multi-threaded program |
6de9cd9a DN |
687 | |
688 | fmudflapir | |
50431bc4 | 689 | Common RejectNegative Report Var(flag_mudflap_ignore_reads) |
c85ce869 | 690 | Ignore read operations when inserting mudflap instrumentation |
6de9cd9a | 691 | |
6fb5fa3c | 692 | fdce |
6ae4be32 | 693 | Common Var(flag_dce) Init(1) Optimization |
6fb5fa3c DB |
694 | Use the RTL dead code elimination pass |
695 | ||
696 | fdse | |
6ae4be32 | 697 | Common Var(flag_dse) Init(1) Optimization |
6fb5fa3c DB |
698 | Use the RTL dead store elimination pass |
699 | ||
d72372e4 | 700 | freschedule-modulo-scheduled-loops |
c662432e | 701 | Common Report Var(flag_resched_modulo_sched) Optimization |
d72372e4 MH |
702 | Enable/Disable the traditional scheduling in loops that already passed modulo scheduling |
703 | ||
6ff3a151 | 704 | fnon-call-exceptions |
c662432e | 705 | Common Report Var(flag_non_call_exceptions) Optimization |
f3fdaec4 | 706 | Support synchronous non-call exceptions |
6ff3a151 | 707 | |
de32c0cb | 708 | fomit-frame-pointer |
c662432e | 709 | Common Report Var(flag_omit_frame_pointer) Optimization |
f3fdaec4 | 710 | When possible do not generate stack frames |
de32c0cb | 711 | |
917948d3 ZD |
712 | fopenmp-ssa |
713 | Common Report Var(flag_openmp_ssa) | |
714 | Expand OpenMP operations on SSA form | |
715 | ||
6ff3a151 | 716 | foptimize-register-move |
c662432e | 717 | Common Report Var(flag_regmove) Optimization |
f3fdaec4 | 718 | Do the full register move optimization pass |
6ff3a151 | 719 | |
de32c0cb | 720 | foptimize-sibling-calls |
c662432e | 721 | Common Report Var(flag_optimize_sibling_calls) Optimization |
f3fdaec4 | 722 | Optimize sibling and tail recursive calls |
de32c0cb | 723 | |
a5573239 JH |
724 | fpre-ipa-mem-report |
725 | Common Report Var(pre_ipa_mem_report) | |
726 | Report on memory allocation before interprocedural optimization | |
727 | ||
728 | fpost-ipa-mem-report | |
729 | Common Report Var(post_ipa_mem_report) | |
730 | Report on memory allocation before interprocedural optimization | |
731 | ||
6ff3a151 | 732 | fpack-struct |
c662432e | 733 | Common Report Var(flag_pack_struct) Optimization |
f3fdaec4 | 734 | Pack structure members together without holes |
6ff3a151 | 735 | |
467cecf3 | 736 | fpack-struct= |
c662432e | 737 | Common RejectNegative Joined UInteger Optimization |
467cecf3 JB |
738 | -fpack-struct=<number> Set initial maximum structure member alignment |
739 | ||
de32c0cb | 740 | fpcc-struct-return |
50431bc4 | 741 | Common Report Var(flag_pcc_struct_return,1) VarExists |
f3fdaec4 | 742 | Return small aggregates in memory, not registers |
de32c0cb NB |
743 | |
744 | fpeel-loops | |
c662432e | 745 | Common Report Var(flag_peel_loops) Optimization |
f3fdaec4 | 746 | Perform loop peeling |
de32c0cb NB |
747 | |
748 | fpeephole | |
c662432e | 749 | Common Report Var(flag_no_peephole,0) Optimization |
f3fdaec4 | 750 | Enable machine specific peephole optimizations |
de32c0cb | 751 | |
6ff3a151 | 752 | fpeephole2 |
c662432e | 753 | Common Report Var(flag_peephole2) Optimization |
f3fdaec4 | 754 | Enable an RTL peephole pass before sched2 |
6ff3a151 | 755 | |
31b66477 KC |
756 | fPIC |
757 | Common Report Var(flag_pic,2) | |
758 | Generate position-independent code if possible (large mode) | |
759 | ||
760 | fPIE | |
761 | Common Report Var(flag_pie,2) | |
762 | Generate position-independent code for executables if possible (large mode) | |
763 | ||
6ff3a151 | 764 | fpic |
50431bc4 | 765 | Common Report Var(flag_pic,1) VarExists |
31b66477 | 766 | Generate position-independent code if possible (small mode) |
6ff3a151 NB |
767 | |
768 | fpie | |
50431bc4 | 769 | Common Report Var(flag_pie,1) VarExists |
31b66477 | 770 | Generate position-independent code for executables if possible (small mode) |
6ff3a151 | 771 | |
bbc8a8dc | 772 | fpredictive-commoning |
6ae4be32 | 773 | Common Report Var(flag_predictive_commoning) Optimization |
bbc8a8dc ZD |
774 | Run predictive commoning optimization. |
775 | ||
de32c0cb | 776 | fprefetch-loop-arrays |
c662432e | 777 | Common Report Var(flag_prefetch_loop_arrays) Optimization |
f3fdaec4 | 778 | Generate prefetch instructions, if available, for arrays in loops |
de32c0cb | 779 | |
6ff3a151 | 780 | fprofile |
50431bc4 | 781 | Common Report Var(profile_flag) |
f3fdaec4 | 782 | Enable basic program profiling code |
6ff3a151 NB |
783 | |
784 | fprofile-arcs | |
50431bc4 | 785 | Common Report Var(profile_arc_flag) |
f3fdaec4 | 786 | Insert arc-based program profiling code |
6ff3a151 | 787 | |
a8a5f53a JH |
788 | fprofile-generate |
789 | Common | |
790 | Enable common options for generating profile info for profile feedback directed optimizations | |
791 | ||
792 | fprofile-use | |
793 | Common | |
794 | Enable common options for performing profile feedback directed optimizations | |
795 | ||
fca9dc00 | 796 | fprofile-values |
50431bc4 | 797 | Common Report Var(flag_profile_values) |
fca9dc00 ZD |
798 | Insert code to profile values of expressions |
799 | ||
de32c0cb NB |
800 | frandom-seed |
801 | Common | |
802 | ||
803 | frandom-seed= | |
804 | Common Joined RejectNegative | |
cf03fd63 | 805 | -frandom-seed=<string> Make compile reproducible using <string> |
de32c0cb | 806 | |
e0d9d0dd NC |
807 | ; This switch causes the command line that was used to create an |
808 | ; object file to be recorded into the object file. The exact format | |
809 | ; of this recording is target and binary file format dependent. | |
810 | ; It is related to the -fverbose-asm switch, but that switch only | |
811 | ; records information in the assembler output file as comments, so | |
812 | ; they never reach the object file. | |
813 | frecord-gcc-switches | |
814 | Common Report Var(flag_record_gcc_switches) | |
815 | Record gcc command line switches in the object file. | |
816 | ||
de32c0cb | 817 | freg-struct-return |
c662432e | 818 | Common Report Var(flag_pcc_struct_return,0) VarExists Optimization |
f3fdaec4 | 819 | Return small aggregates in registers |
de32c0cb | 820 | |
6ff3a151 | 821 | fregmove |
c662432e | 822 | Common Report Var(flag_regmove) Optimization |
f3fdaec4 | 823 | Enables a register move optimization |
6ff3a151 NB |
824 | |
825 | frename-registers | |
c662432e | 826 | Common Report Var(flag_rename_registers) Init(2) Optimization |
f3fdaec4 | 827 | Perform a register renaming optimization pass |
6ff3a151 NB |
828 | |
829 | freorder-blocks | |
c662432e | 830 | Common Report Var(flag_reorder_blocks) Optimization |
f3fdaec4 | 831 | Reorder basic blocks to improve code placement |
6ff3a151 | 832 | |
750054a2 | 833 | freorder-blocks-and-partition |
c662432e | 834 | Common Report Var(flag_reorder_blocks_and_partition) Optimization |
750054a2 CT |
835 | Reorder basic blocks and partition into hot and cold sections |
836 | ||
6ff3a151 | 837 | freorder-functions |
c662432e | 838 | Common Report Var(flag_reorder_functions) Optimization |
f3fdaec4 | 839 | Reorder functions to improve code placement |
6ff3a151 | 840 | |
de32c0cb | 841 | frerun-cse-after-loop |
c662432e | 842 | Common Report Var(flag_rerun_cse_after_loop) Init(2) Optimization |
f3fdaec4 | 843 | Add a common subexpression elimination pass after loop optimizations |
de32c0cb | 844 | |
efa1cdf0 ZD |
845 | frerun-loop-opt |
846 | Common | |
c0220ea4 | 847 | Does nothing. Preserved for backward compatibility. |
efa1cdf0 | 848 | |
039c3d42 | 849 | frounding-math |
c662432e | 850 | Common Report Var(flag_rounding_math) Optimization |
039c3d42 RS |
851 | Disable optimizations that assume default FP rounding behavior |
852 | ||
6ff3a151 | 853 | fsched-interblock |
c662432e | 854 | Common Report Var(flag_schedule_interblock) Init(1) Optimization |
f3fdaec4 | 855 | Enable scheduling across basic blocks |
6ff3a151 NB |
856 | |
857 | fsched-spec | |
c662432e | 858 | Common Report Var(flag_schedule_speculative) Init(1) Optimization |
f3fdaec4 | 859 | Allow speculative motion of non-loads |
6ff3a151 NB |
860 | |
861 | fsched-spec-load | |
c662432e | 862 | Common Report Var(flag_schedule_speculative_load) Optimization |
f3fdaec4 | 863 | Allow speculative motion of some loads |
6ff3a151 NB |
864 | |
865 | fsched-spec-load-dangerous | |
c662432e | 866 | Common Report Var(flag_schedule_speculative_load_dangerous) Optimization |
f3fdaec4 | 867 | Allow speculative motion of more loads |
6ff3a151 | 868 | |
de32c0cb NB |
869 | fsched-verbose= |
870 | Common RejectNegative Joined | |
cf03fd63 | 871 | -fsched-verbose=<number> Set the verbosity level of the scheduler |
de32c0cb | 872 | |
6ff3a151 | 873 | fsched2-use-superblocks |
c662432e | 874 | Common Report Var(flag_sched2_use_superblocks) Optimization |
f3fdaec4 | 875 | If scheduling post reload, do superblock scheduling |
6ff3a151 NB |
876 | |
877 | fsched2-use-traces | |
c662432e | 878 | Common Report Var(flag_sched2_use_traces) Optimization |
f3fdaec4 | 879 | If scheduling post reload, do trace scheduling |
6ff3a151 | 880 | |
de32c0cb | 881 | fschedule-insns |
c662432e | 882 | Common Report Var(flag_schedule_insns) Optimization |
f3fdaec4 | 883 | Reschedule instructions before register allocation |
de32c0cb NB |
884 | |
885 | fschedule-insns2 | |
c662432e | 886 | Common Report Var(flag_schedule_insns_after_reload) Optimization |
f3fdaec4 | 887 | Reschedule instructions after register allocation |
de32c0cb | 888 | |
31b66477 KC |
889 | ; sched_stalled_insns means that insns can be moved prematurely from the queue |
890 | ; of stalled insns into the ready list. | |
569fa502 | 891 | fsched-stalled-insns |
c662432e | 892 | Common Report Var(flag_sched_stalled_insns) Optimization |
569fa502 DN |
893 | Allow premature scheduling of queued insns |
894 | ||
895 | fsched-stalled-insns= | |
c22cacf3 | 896 | Common RejectNegative Joined UInteger |
4e994432 | 897 | -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled |
569fa502 | 898 | |
31b66477 KC |
899 | ; sched_stalled_insns_dep controls how many recently scheduled cycles will |
900 | ; be examined for a dependency on a stalled insn that is candidate for | |
901 | ; premature removal from the queue of stalled insns into the ready list (has | |
902 | ; an effect only if the flag 'sched_stalled_insns' is set). | |
569fa502 | 903 | fsched-stalled-insns-dep |
c662432e | 904 | Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization |
569fa502 DN |
905 | Set dependence distance checking in premature scheduling of queued insns |
906 | ||
907 | fsched-stalled-insns-dep= | |
908 | Common RejectNegative Joined UInteger | |
4e994432 | 909 | -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns |
569fa502 | 910 | |
aacd3885 | 911 | fsection-anchors |
c662432e | 912 | Common Report Var(flag_section_anchors) Optimization |
aacd3885 RS |
913 | Access data in the same section from shared anchor points |
914 | ||
38109dab | 915 | frtl-abstract-sequences |
c662432e | 916 | Common Report Var(flag_rtl_seqabstr) Optimization |
38109dab GL |
917 | Perform sequence abstraction optimization on RTL |
918 | ||
8cd37d0b RL |
919 | fsee |
920 | Common Report Var(flag_see) Init(0) | |
921 | Eliminate redundant sign extensions using LCM. | |
922 | ||
8abb6b22 PB |
923 | fshow-column |
924 | Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1) | |
c85ce869 | 925 | Show column numbers in diagnostics, when available. Default on |
8abb6b22 | 926 | |
6ff3a151 | 927 | fsignaling-nans |
c662432e | 928 | Common Report Var(flag_signaling_nans) Optimization |
f3fdaec4 | 929 | Disable optimizations observable by IEEE signaling NaNs |
6ff3a151 | 930 | |
db02da79 | 931 | fsigned-zeros |
21af5cdf | 932 | Common Report Var(flag_signed_zeros) Init(1) Optimization |
db02da79 RS |
933 | Disable floating point optimizations that ignore the IEEE signedness of zero |
934 | ||
6ff3a151 | 935 | fsingle-precision-constant |
c662432e | 936 | Common Report Var(flag_single_precision_constant) Optimization |
f3fdaec4 | 937 | Convert floating point constants to single precision constants |
6ff3a151 | 938 | |
113d659a | 939 | fsplit-ivs-in-unroller |
c662432e | 940 | Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization |
c85ce869 | 941 | Split lifetimes of induction variables when loops are unrolled |
113d659a | 942 | |
e53a16e7 | 943 | fsplit-wide-types |
21af5cdf | 944 | Common Report Var(flag_split_wide_types) Optimization |
e53a16e7 ILT |
945 | Split wide types into independent registers |
946 | ||
f37a4f14 | 947 | fvariable-expansion-in-unroller |
c662432e | 948 | Common Report Var(flag_variable_expansion_in_unroller) Optimization |
c85ce869 | 949 | Apply variable expansion when loops are unrolled |
f37a4f14 | 950 | |
31b66477 KC |
951 | ; Emit code to probe the stack, to help detect stack overflow; also |
952 | ; may cause large objects to be allocated dynamically. | |
6ff3a151 | 953 | fstack-check |
50431bc4 | 954 | Common Report Var(flag_stack_check) |
f3fdaec4 | 955 | Insert stack checking code into the program |
6ff3a151 | 956 | |
de32c0cb NB |
957 | fstack-limit |
958 | Common | |
959 | ||
058de654 NB |
960 | fstack-limit-register= |
961 | Common RejectNegative Joined | |
cf03fd63 | 962 | -fstack-limit-register=<register> Trap if the stack goes past <register> |
058de654 NB |
963 | |
964 | fstack-limit-symbol= | |
965 | Common RejectNegative Joined | |
cf03fd63 | 966 | -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name> |
058de654 | 967 | |
7d69de61 RH |
968 | fstack-protector |
969 | Common Report Var(flag_stack_protect, 1) | |
970 | Use propolice as a stack protection method | |
971 | ||
972 | fstack-protector-all | |
973 | Common Report RejectNegative Var(flag_stack_protect, 2) VarExists | |
974 | Use a stack protection method for every function | |
975 | ||
de32c0cb | 976 | fstrength-reduce |
efa1cdf0 | 977 | Common |
c0220ea4 | 978 | Does nothing. Preserved for backward compatibility. |
de32c0cb | 979 | |
31b66477 KC |
980 | ; Nonzero if we should do (language-dependent) alias analysis. |
981 | ; Typically, this analysis will assume that expressions of certain | |
982 | ; types do not alias expressions of certain other types. Only used | |
983 | ; if alias analysis (in general) is enabled. | |
6ff3a151 | 984 | fstrict-aliasing |
c662432e | 985 | Common Report Var(flag_strict_aliasing) Optimization |
f3fdaec4 | 986 | Assume strict aliasing rules apply |
6ff3a151 | 987 | |
eeef0e45 ILT |
988 | fstrict-overflow |
989 | Common Report Var(flag_strict_overflow) | |
990 | Treat signed overflow as undefined | |
991 | ||
de32c0cb | 992 | fsyntax-only |
50431bc4 | 993 | Common Report Var(flag_syntax_only) |
f3fdaec4 | 994 | Check for syntax errors, then stop |
de32c0cb | 995 | |
6ff3a151 | 996 | ftest-coverage |
50431bc4 | 997 | Common Report Var(flag_test_coverage) |
f3fdaec4 | 998 | Create data files needed by \"gcov\" |
6ff3a151 | 999 | |
de32c0cb | 1000 | fthread-jumps |
c662432e | 1001 | Common Report Var(flag_thread_jumps) Optimization |
f3fdaec4 | 1002 | Perform jump threading optimizations |
de32c0cb | 1003 | |
6ff3a151 | 1004 | ftime-report |
50431bc4 | 1005 | Common Report Var(time_report) |
f3fdaec4 | 1006 | Report the time taken by each compiler pass |
6ff3a151 | 1007 | |
058de654 NB |
1008 | ftls-model= |
1009 | Common Joined RejectNegative | |
cf03fd63 | 1010 | -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model |
058de654 | 1011 | |
474eccc6 | 1012 | ftoplevel-reorder |
c662432e | 1013 | Common Report Var(flag_toplevel_reorder) Init(1) Optimization |
474eccc6 ILT |
1014 | Reorder top level functions, variables, and asms |
1015 | ||
de32c0cb | 1016 | ftracer |
50431bc4 | 1017 | Common Report Var(flag_tracer) |
f3fdaec4 | 1018 | Perform superblock formation via tail duplication |
de32c0cb | 1019 | |
31b66477 KC |
1020 | ; Zero means that floating-point math operations cannot generate a |
1021 | ; (user-visible) trap. This is the case, for example, in nonstop | |
1022 | ; IEEE 754 arithmetic. | |
6ff3a151 | 1023 | ftrapping-math |
c662432e | 1024 | Common Report Var(flag_trapping_math) Init(1) Optimization |
f3fdaec4 | 1025 | Assume floating-point operations can trap |
6ff3a151 NB |
1026 | |
1027 | ftrapv | |
c662432e | 1028 | Common Report Var(flag_trapv) Optimization |
f3fdaec4 | 1029 | Trap for signed overflow in addition, subtraction and multiplication |
6ff3a151 | 1030 | |
6de9cd9a | 1031 | ftree-ccp |
c662432e | 1032 | Common Report Var(flag_tree_ccp) Optimization |
6de9cd9a DN |
1033 | Enable SSA-CCP optimization on trees |
1034 | ||
0bca51f0 | 1035 | ftree-store-ccp |
c662432e | 1036 | Common Report Var(flag_tree_store_ccp) Optimization |
0bca51f0 DN |
1037 | Enable SSA-CCP optimization for stores and loads |
1038 | ||
6de9cd9a | 1039 | ftree-ch |
c662432e | 1040 | Common Report Var(flag_tree_ch) Optimization |
6de9cd9a DN |
1041 | Enable loop header copying on trees |
1042 | ||
6de9cd9a | 1043 | ftree-copyrename |
c662432e | 1044 | Common Report Var(flag_tree_copyrename) Optimization |
c85ce869 | 1045 | Replace SSA temporaries with better names in copies |
6de9cd9a | 1046 | |
0bca51f0 | 1047 | ftree-copy-prop |
c662432e | 1048 | Common Report Var(flag_tree_copy_prop) Optimization |
0bca51f0 DN |
1049 | Enable copy propagation on trees |
1050 | ||
1051 | ftree-store-copy-prop | |
c662432e | 1052 | Common Report Var(flag_tree_store_copy_prop) Optimization |
0bca51f0 DN |
1053 | Enable copy propagation for stores and loads |
1054 | ||
6de9cd9a | 1055 | ftree-dce |
c662432e | 1056 | Common Report Var(flag_tree_dce) Optimization |
6de9cd9a DN |
1057 | Enable SSA dead code elimination optimization on trees |
1058 | ||
1059 | ftree-dominator-opts | |
c662432e | 1060 | Common Report Var(flag_tree_dom) Optimization |
6de9cd9a DN |
1061 | Enable dominator optimizations |
1062 | ||
1063 | ftree-dse | |
c662432e | 1064 | Common Report Var(flag_tree_dse) Optimization |
6de9cd9a DN |
1065 | Enable dead store elimination |
1066 | ||
ff2ad0f7 | 1067 | ftree-fre |
c662432e | 1068 | Common Report Var(flag_tree_fre) Optimization |
ff2ad0f7 DN |
1069 | Enable Full Redundancy Elimination (FRE) on trees |
1070 | ||
1b08d87d | 1071 | ftree-loop-im |
c662432e | 1072 | Common Report Var(flag_tree_loop_im) Init(1) Optimization |
a7e5372d ZD |
1073 | Enable loop invariant motion on trees |
1074 | ||
599eabdb | 1075 | ftree-loop-linear |
c662432e | 1076 | Common Report Var(flag_tree_loop_linear) Optimization |
599eabdb DB |
1077 | Enable linear loop transforms on trees |
1078 | ||
1b08d87d | 1079 | ftree-loop-ivcanon |
c662432e | 1080 | Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization |
1b08d87d DB |
1081 | Create canonical induction variables in loops |
1082 | ||
c66b6c66 | 1083 | ftree-loop-optimize |
c662432e | 1084 | Common Report Var(flag_tree_loop_optimize) Init(1) Optimization |
c66b6c66 ZD |
1085 | Enable loop optimizations on tree level |
1086 | ||
6de9cd9a | 1087 | ftree-pre |
c662432e | 1088 | Common Report Var(flag_tree_pre) Optimization |
6de9cd9a DN |
1089 | Enable SSA-PRE optimization on trees |
1090 | ||
13c59415 UB |
1091 | ftree-reassoc |
1092 | Common Report Var(flag_tree_reassoc) Init(1) Optimization | |
1093 | Enable reassociation on tree level | |
1094 | ||
c75ab022 | 1095 | ftree-salias |
c662432e | 1096 | Common Report Var(flag_tree_salias) Optimization |
c75ab022 DB |
1097 | Perform structural alias analysis |
1098 | ||
fa555252 | 1099 | ftree-sink |
c662432e | 1100 | Common Report Var(flag_tree_sink) Optimization |
fa555252 DB |
1101 | Enable SSA code sinking on trees |
1102 | ||
6de9cd9a | 1103 | ftree-sra |
c662432e | 1104 | Common Report Var(flag_tree_sra) Optimization |
6de9cd9a DN |
1105 | Perform scalar replacement of aggregates |
1106 | ||
1107 | ftree-ter | |
c662432e | 1108 | Common Report Var(flag_tree_ter) Optimization |
6de9cd9a DN |
1109 | Replace temporary expressions in the SSA->normal pass |
1110 | ||
c662432e NC |
1111 | ftree-lrs |
1112 | Common Report Var(flag_tree_live_range_split) Optimization | |
1113 | Perform live range splitting during the SSA->normal pass | |
1114 | ||
0bca51f0 | 1115 | ftree-vrp |
c662432e | 1116 | Common Report Var(flag_tree_vrp) Init(0) Optimization |
0bca51f0 DN |
1117 | Perform Value Range Propagation on trees |
1118 | ||
de32c0cb | 1119 | funit-at-a-time |
c662432e | 1120 | Common Report Var(flag_unit_at_a_time) Optimization |
f3fdaec4 | 1121 | Compile whole compilation unit at a time |
de32c0cb NB |
1122 | |
1123 | funroll-loops | |
c662432e | 1124 | Common Report Var(flag_unroll_loops) Optimization |
f3fdaec4 | 1125 | Perform loop unrolling when iteration count is known |
de32c0cb NB |
1126 | |
1127 | funroll-all-loops | |
c662432e | 1128 | Common Report Var(flag_unroll_all_loops) Optimization |
f3fdaec4 | 1129 | Perform loop unrolling for all loops |
de32c0cb | 1130 | |
f9cc1a70 PB |
1131 | ; Nonzero means that loop optimizer may assume that the induction variables |
1132 | ; that control loops do not overflow and that the loops with nontrivial | |
1133 | ; exit condition are not infinite | |
1134 | funsafe-loop-optimizations | |
c662432e | 1135 | Common Report Var(flag_unsafe_loop_optimizations) Optimization |
f9cc1a70 PB |
1136 | Allow loop optimizations to assume that the loops behave in normal way |
1137 | ||
a1a82611 RE |
1138 | fassociative-math |
1139 | Common Report Var(flag_associative_math) | |
1140 | Allow optimization for floating-point arithmetic which may change the | |
1141 | result of the operation due to rounding. | |
1142 | ||
1143 | freciprocal-math | |
1144 | Common Report Var(flag_reciprocal_math) | |
1145 | Same as -fassociative-math for expressions which include division. | |
1146 | ||
31b66477 KC |
1147 | ; Nonzero means that unsafe floating-point math optimizations are allowed |
1148 | ; for the sake of speed. IEEE compliance is not guaranteed, and operations | |
1149 | ; are allowed to assume that their arguments and results are "normal" | |
1150 | ; (e.g., nonnegative for SQRT). | |
6ff3a151 | 1151 | funsafe-math-optimizations |
c662432e | 1152 | Common Report Var(flag_unsafe_math_optimizations) Optimization |
f3fdaec4 | 1153 | Allow math optimizations that may violate IEEE or ISO standards |
6ff3a151 | 1154 | |
de32c0cb | 1155 | funswitch-loops |
c662432e | 1156 | Common Report Var(flag_unswitch_loops) Optimization |
f3fdaec4 | 1157 | Perform loop unswitching |
de32c0cb | 1158 | |
6ff3a151 | 1159 | funwind-tables |
c662432e | 1160 | Common Report Var(flag_unwind_tables) Optimization |
f3fdaec4 | 1161 | Just generate unwind tables for exception handling |
6ff3a151 | 1162 | |
014a1138 | 1163 | fvar-tracking |
c662432e | 1164 | Common Report Var(flag_var_tracking) VarExists Optimization |
014a1138 JZ |
1165 | Perform variable tracking |
1166 | ||
62760ffd CT |
1167 | fvar-tracking-uninit |
1168 | Common Report Var(flag_var_tracking_uninit) Optimization | |
1169 | Perform variable tracking and also tag variables that are uninitialized | |
1170 | ||
79fe1b3b | 1171 | ftree-vectorize |
c662432e | 1172 | Common Report Var(flag_tree_vectorize) Optimization |
79fe1b3b DN |
1173 | Enable loop vectorization on trees |
1174 | ||
792ed98b HJ |
1175 | fvect-cost-model |
1176 | Common Report Var(flag_vect_cost_model) Optimization | |
1177 | Enable use of cost model in vectorization | |
1178 | ||
c12cc930 | 1179 | ftree-vect-loop-version |
c662432e | 1180 | Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization |
c12cc930 KB |
1181 | Enable loop versioning when doing loop vectorization on trees |
1182 | ||
c866976a LB |
1183 | ftree-vectorizer-verbose= |
1184 | Common RejectNegative Joined | |
4e994432 | 1185 | -ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer |
c866976a | 1186 | |
fbf798fc | 1187 | ftree-scev-cprop |
21af5cdf | 1188 | Common Report Var(flag_tree_scev_cprop) Init(1) Optimization |
fbf798fc DN |
1189 | Enable copy propagation of scalar-evolution information. |
1190 | ||
31b66477 KC |
1191 | ; -fverbose-asm causes extra commentary information to be produced in |
1192 | ; the generated assembly code (to make it more readable). This option | |
1193 | ; is generally only of use to those who actually need to read the | |
1194 | ; generated assembly code (perhaps while debugging the compiler itself). | |
1195 | ; -fno-verbose-asm, the default, causes the extra information | |
1196 | ; to not be added and is useful when comparing two assembler files. | |
6ff3a151 | 1197 | fverbose-asm |
50431bc4 | 1198 | Common Report Var(flag_verbose_asm) |
f3fdaec4 | 1199 | Add extra commentary to assembler output |
6ff3a151 | 1200 | |
d7afec4b ND |
1201 | fvisibility= |
1202 | Common Joined RejectNegative | |
1203 | -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility | |
1204 | ||
1205 | ||
fca9dc00 | 1206 | fvpt |
c662432e | 1207 | Common Report Var(flag_value_profile_transformations) Optimization |
fca9dc00 ZD |
1208 | Use expression value profiles in optimizations |
1209 | ||
62551c66 | 1210 | fweb |
c662432e | 1211 | Common Report Var(flag_web) Init(2) Optimization |
62551c66 JH |
1212 | Construct webs and split unrelated uses of single variable |
1213 | ||
ce91e74c | 1214 | fwhole-program |
c662432e | 1215 | Common Report Var(flag_whole_program) Init(0) Optimization |
ce91e74c JH |
1216 | Perform whole program optimizations |
1217 | ||
6ff3a151 | 1218 | fwrapv |
c662432e | 1219 | Common Report Var(flag_wrapv) Optimization |
f3fdaec4 | 1220 | Assume signed arithmetic overflow wraps around |
6ff3a151 | 1221 | |
6ff3a151 | 1222 | fzero-initialized-in-bss |
50431bc4 | 1223 | Common Report Var(flag_zero_initialized_in_bss) Init(1) |
f3fdaec4 | 1224 | Put zero initialized data in the bss section |
6ff3a151 | 1225 | |
e01cc6dc NB |
1226 | g |
1227 | Common JoinedOrMissing | |
df38ffef NB |
1228 | Generate debug information in default format |
1229 | ||
1230 | gcoff | |
14c7833c | 1231 | Common JoinedOrMissing Negative(gdwarf-2) |
df38ffef NB |
1232 | Generate debug information in COFF format |
1233 | ||
df38ffef | 1234 | gdwarf-2 |
14c7833c | 1235 | Common JoinedOrMissing Negative(gstabs) |
df38ffef NB |
1236 | Generate debug information in DWARF v2 format |
1237 | ||
1238 | ggdb | |
1239 | Common JoinedOrMissing | |
1240 | Generate debug information in default extended format | |
1241 | ||
1242 | gstabs | |
14c7833c | 1243 | Common JoinedOrMissing Negative(gstabs+) |
df38ffef NB |
1244 | Generate debug information in STABS format |
1245 | ||
1246 | gstabs+ | |
14c7833c | 1247 | Common JoinedOrMissing Negative(gvms) |
df38ffef NB |
1248 | Generate debug information in extended STABS format |
1249 | ||
1250 | gvms | |
14c7833c | 1251 | Common JoinedOrMissing Negative(gxcoff) |
df38ffef NB |
1252 | Generate debug information in VMS format |
1253 | ||
1254 | gxcoff | |
14c7833c | 1255 | Common JoinedOrMissing Negative(gxcoff+) |
df38ffef NB |
1256 | Generate debug information in XCOFF format |
1257 | ||
1258 | gxcoff+ | |
14c7833c | 1259 | Common JoinedOrMissing Negative(gcoff) |
df38ffef | 1260 | Generate debug information in extended XCOFF format |
e01cc6dc | 1261 | |
d185d268 NB |
1262 | o |
1263 | Common Joined Separate | |
cf03fd63 | 1264 | -o <file> Place output into <file> |
d185d268 NB |
1265 | |
1266 | p | |
50431bc4 | 1267 | Common Var(profile_flag) |
cf03fd63 | 1268 | Enable function profiling |
d185d268 NB |
1269 | |
1270 | pedantic | |
50431bc4 | 1271 | Common Var(pedantic) |
cf03fd63 | 1272 | Issue warnings needed for strict compliance to the standard |
d185d268 NB |
1273 | |
1274 | pedantic-errors | |
1275 | Common | |
cf03fd63 | 1276 | Like -pedantic but issue them as errors |
d185d268 | 1277 | |
d7b42618 | 1278 | quiet |
50431bc4 | 1279 | Common Var(quiet_flag) |
cf03fd63 | 1280 | Do not display functions compiled or elapsed time |
d7b42618 | 1281 | |
d185d268 | 1282 | version |
50431bc4 | 1283 | Common Var(version_flag) |
cf03fd63 | 1284 | Display the compiler's version |
d185d268 NB |
1285 | |
1286 | w | |
50431bc4 | 1287 | Common Var(inhibit_warnings) |
cf03fd63 | 1288 | Suppress warnings |
d185d268 | 1289 | |
d7b42618 | 1290 | ; This comment is to ensure we retain the blank line above. |