1 ; Options for the language- and target-independent parts of the compiler.
2 ; Copyright (C) 2003, 2004 Free Software Foundation, Inc.
4 ; This file is part of GCC.
6 ; GCC is free software; you can redistribute it and/or modify it under
7 ; the terms of the GNU General Public License as published by the Free
8 ; Software Foundation; either version 2, or (at your option) any later
11 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 ; You should have received a copy of the GNU General Public License
17 ; along with GCC; see the file COPYING. If not, write to the Free
18 ; Software Foundation, 59 Temple Place - Suite 330, Boston, MA
21 ; See c.opt for a description of this file's format.
23 ; Please try to keep this file in ASCII collating order.
27 Display this information
31 --param <param>=<value> Set paramter <param> to value. See below for a complete list of parameters
40 Common Joined Separate UInteger
41 -G<number> Put global and static data smaller than <number> bytes into a special section (on some targets)
44 Common JoinedOrMissing
45 -O<number> Set optimization level to <number>
49 Optimize for space rather than speed
53 This switch is deprecated; use -Wextra instead
57 Warn about returning structures, unions or arrays
61 Warn about pointer casts which increase alignment
63 Wdeprecated-declarations
65 Warn about uses of __attribute__((deprecated)) declarations
67 Wdisabled-optimization
69 Warn when an optimization pass is disabled
73 Treat all warnings as errors
77 Print extra (possibly unwanted) warnings
81 Warn when an inlined function cannot be inlined
84 Common RejectNegative Joined UInteger
85 -Wlarger-than-<number> Warn if an object is larger than <number> bytes
89 Warn about functions which might be candidates for __attribute__((noreturn))
93 Warn when the packed attribute has no effect on struct layout
97 Warn when padding is required to align structure members
101 Warn when one local variable shadows another
105 Warn about code which might break strict aliasing rules
109 Warn about enumerated switches, with no default, missing a case
113 Warn about enumerated switches missing a \"default:\" statement
117 Warn about all enumerated switches missing a specific case
121 Do not suppress warnings from system headers
125 Warn about uninitialized automatic variables
129 Warn about code that will never be executed
133 Enable all -Wunused- warnings
137 Warn when a function is unused
141 Warn when a label is unused
145 Warn when a function parameter is unused
149 Warn when an expression value is unused
153 Warn when a variable is unused
157 -aux-info <file> Emit declaration information into <file>
170 -d<letters> Enable dumps from specific passes of the compiler
174 -dumpbase <file> Set the file basename to be used for dumps
184 Align the start of functions
187 Common RejectNegative Joined UInteger
191 Align labels which are only reached by jumping
194 Common RejectNegative Joined UInteger
201 Common RejectNegative Joined UInteger
205 Align the start of loops
208 Common RejectNegative Joined UInteger
212 Specify that arguments may alias each other and globals
216 Assume arguments may alias globals but not each other
218 fargument-noalias-global
220 Assume arguments alias neither each other nor globals
222 fasynchronous-unwind-tables
224 Generate unwind tables that are exact at each instruction boundary
228 Generate code to check bounds before indexing arrays
232 Replace add, compare, branch with branch on count register
234 fbranch-probabilities
236 Use profiling information for branch probabilities
238 fbranch-target-load-optimize
240 Perform branch target load optimization before prologue / epilogue threading
242 fbranch-target-load-optimize2
244 Perform branch target load optimization after prologue / epilogue threading
248 Restrict target load migration not to re-use registers in any basic block
251 Common Joined RejectNegative
252 -fcall-saved-<register> Mark <register> as being preserved across functions
255 Common Joined RejectNegative
256 -fcall-used-<register> Mark <register> as being corrupted by function calls
260 Save registers around function calls
264 Do not put uninitialized globals in the common section
268 Perform a register copy-propagation optimization pass
272 Perform cross-jumping optimization
276 When running CSE, follow jumps to their targets
280 When running CSE, follow conditional jumps
284 Place data items into their own section
288 Defer popping functions args from stack until later
292 Attempt to fill delay slots of branch instructions
294 fdelete-null-pointer-checks
296 Delete useless null pointer checks
298 fdiagnostics-show-location=
299 Common Joined RejectNegative
300 -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
304 Suppress output of instruction numbers and line number notes in debugging dumps
306 feliminate-dwarf2-dups
308 Perform DWARF2 duplicate elimination
310 feliminate-unused-debug-symbols
312 Perform unused type elimination in debug info
314 feliminate-unused-debug-types
316 Perform unused type elimination in debug info
320 Enable exception handling
322 fexpensive-optimizations
324 Perform a number of minor, expensive optimizations
331 Assume no NaNs or infinities are generated
334 Common Joined RejectNegative
335 -ffixed-<register> Mark <register> as being unavailable to the compiler
339 Do not store floats in registers
343 Copy memory address constants into registers before use
347 Copy memory operands into registers before use
351 Allow function addresses to be held in registers
355 Place each function into its own section
359 Perform global common subexpression elimination
363 Perform enhanced load motion during global common subexpression elimination
367 Perform store motion after global common subexpression elimination
371 Perform redundant load after store elimination in global common subexpression elimination
373 fguess-branch-probability
375 Enable guessing of branch probabilities
379 Process #ident directives
383 Perform conversion of conditional jumps to branchless equivalents
387 Perform conversion of conditional jumps to conditional execution
389 finhibit-size-directive
391 Do not generate .size directives
395 Pay attention to the \"inline\" keyword
399 Integrate simple functions into their callers
402 Common RejectNegative Joined UInteger
405 Common RejectNegative Joined UInteger
406 -finline-limit=<number> Limit the size of inlined functions to <number>
408 finstrument-functions
410 Instrument function entry and exit with profiling calls
412 fkeep-inline-functions
414 Generate code for functions even if they are fully inlined
418 Emit static const variables even if they are not used
422 Give external symbols a leading underscore
426 Perform loop optimizations
430 Set errno after built-in math functions
434 Report on permanent memory allocation
438 Attempt to merge identical constants and constant variables
442 Attempt to merge identical constants across compilation units
445 Common RejectNegative Joined UInteger
446 -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
450 Force all loop invariant computations out of loops
454 Use graph-coloring register allocation
458 Support synchronous non-call exceptions
462 Perform loop unrolling when iteration count is known
464 fold-unroll-all-loops
466 Perform loop unrolling for all loops
470 When possible do not generate stack frames
472 foptimize-register-move
474 Do the full register move optimization pass
476 foptimize-sibling-calls
478 Optimize sibling and tail recursive calls
482 Pack structure members together without holes
486 Return small aggregates in memory, not registers
494 Enable machine specific peephole optimizations
498 Enable an RTL peephole pass before sched2
502 Generate position-independent code if possible
506 Generate position-independent code for executables if possible
508 fprefetch-loop-arrays
510 Generate prefetch instructions, if available, for arrays in loops
514 Enable basic program profiling code
518 Insert arc-based program profiling code
522 Enable common options for generating profile info for profile feedback directed optimizations
526 Enable common options for performing profile feedback directed optimizations
530 Insert code to profile values of expressions
536 Common Joined RejectNegative
537 -frandom-seed=<string> Make compile reproducible using <string>
541 Strength reduce all loop general induction variables
545 Return small aggregates in registers
549 Enables a register move optimization
553 Perform a register renaming optimization pass
557 Reorder basic blocks to improve code placement
561 Reorder functions to improve code placement
563 frerun-cse-after-loop
565 Add a common subexpression elimination pass after loop optimizations
569 Run the loop optimizer twice
573 Disable optimizations that assume default FP rounding behavior
577 Enable scheduling across basic blocks
581 Allow speculative motion of non-loads
585 Allow speculative motion of some loads
587 fsched-spec-load-dangerous
589 Allow speculative motion of more loads
592 Common RejectNegative Joined
593 -fsched-verbose=<number> Set the verbosity level of the scheduler
595 fsched2-use-superblocks
597 If scheduling post reload, do superblock scheduling
601 If scheduling post reload, do trace scheduling
605 Reschedule instructions before register allocation
609 Reschedule instructions after register allocation
613 Allow premature scheduling of queued insns
615 fsched-stalled-insns=
616 Common RejectNegative Joined UInteger
617 -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
619 fsched-stalled-insns-dep
621 Set dependence distance checking in premature scheduling of queued insns
623 fsched-stalled-insns-dep=
624 Common RejectNegative Joined UInteger
625 -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
629 Mark data as shared rather than private
633 Disable optimizations observable by IEEE signaling NaNs
635 fsingle-precision-constant
637 Convert floating point constants to single precision constants
641 Insert stack checking code into the program
646 fstack-limit-register=
647 Common RejectNegative Joined
648 -fstack-limit-register=<register> Trap if the stack goes past <register>
651 Common RejectNegative Joined
652 -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
656 Perform strength reduction optimizations
660 Assume strict aliasing rules apply
664 Check for syntax errors, then stop
668 Create data files needed by \"gcov\"
672 Perform jump threading optimizations
676 Report the time taken by each compiler pass
679 Common Joined RejectNegative
680 -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
684 Perform superblock formation via tail duplication
688 Assume floating-point operations can trap
692 Trap for signed overflow in addition, subtraction and multiplication
696 Compile whole compilation unit at a time
700 Perform loop unrolling when iteration count is known
704 Perform loop unrolling for all loops
706 funsafe-math-optimizations
708 Allow math optimizations that may violate IEEE or ISO standards
712 Perform loop unswitching
716 Just generate unwind tables for exception handling
720 Add extra commentary to assembler output
724 Use expression value profiles in optimizations
728 Construct webs and split unrelated uses of single variable
732 Assume signed arithmetic overflow wraps around
736 Store strings in writable data section
738 fzero-initialized-in-bss
740 Put zero initialized data in the bss section
743 Common JoinedOrMissing
744 Generate debug information in default format
747 Common JoinedOrMissing
748 Generate debug information in COFF format
751 Common JoinedOrMissing
752 Generate debug information in DWARF v2 format
755 Common JoinedOrMissing
756 Generate debug information in default extended format
759 Common JoinedOrMissing
760 Generate debug information in STABS format
763 Common JoinedOrMissing
764 Generate debug information in extended STABS format
767 Common JoinedOrMissing
768 Generate debug information in VMS format
771 Common JoinedOrMissing
772 Generate debug information in XCOFF format
775 Common JoinedOrMissing
776 Generate debug information in extended XCOFF format
782 Common Joined Separate
783 -o <file> Place output into <file>
787 Enable function profiling
791 Issue warnings needed for strict compliance to the standard
795 Like -pedantic but issue them as errors
799 Do not display functions compiled or elapsed time
803 Display the compiler's version
809 ; This comment is to ensure we retain the blank line above.