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