809 lines
15 KiB
Plaintext
809 lines
15 KiB
Plaintext
; Options for the language- and target-independent parts of the compiler.
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; Copyright (C) 2003 Free Software Foundation, Inc.
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;
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; This file is part of GCC.
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;
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; GCC is free software; you can redistribute it and/or modify it under
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; the terms of the GNU General Public License as published by the Free
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; Software Foundation; either version 2, or (at your option) any later
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; version.
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;
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; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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; WARRANTY; without even the implied warranty of MERCHANTABILITY or
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; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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; for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with GCC; see the file COPYING. If not, write to the Free
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; Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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; 02111-1307, USA.
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; See c.opt for a description of this file's format.
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; Please try to keep this file in ASCII collating order.
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-help
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Common
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Display this information
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-param
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Common Separate
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--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
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-target-help
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Common
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-version
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Common
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G
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Common Joined Separate UInteger
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-G<number> Put global and static data smaller than <number> bytes into a special section (on some targets)
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O
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Common JoinedOrMissing
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-O<number> Set optimization level to <number>
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Os
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Common
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Optimize for space rather than speed
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W
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Common RejectNegative
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This switch is deprecated; use -Wextra instead
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Waggregate-return
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Common
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Warn about returning structures, unions or arrays
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Wcast-align
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Common
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Warn about pointer casts which increase alignment
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Wdeprecated-declarations
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Common
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Warn about uses of __attribute__((deprecated)) declarations
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Wdisabled-optimization
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Common
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Warn when an optimization pass is disabled
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Werror
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Common
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Treat all warnings as errors
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Wextra
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Common
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Print extra (possibly unwanted) warnings
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Winline
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Common
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Warn when an inlined function cannot be inlined
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Wlarger-than-
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Common RejectNegative Joined UInteger
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-Wlarger-than-<number> Warn if an object is larger than <number> bytes
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Wmissing-noreturn
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Common
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Warn about functions which might be candidates for __attribute__((noreturn))
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Wpacked
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Common
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Warn when the packed attribute has no effect on struct layout
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Wpadded
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Common
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Warn when padding is required to align structure members
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Wshadow
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Common
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Warn when one local variable shadows another
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Wstrict-aliasing
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Common
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Warn about code which might break strict aliasing rules
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Wswitch
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Common
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Warn about enumerated switches, with no default, missing a case
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Wswitch-default
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Common
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Warn about enumerated switches missing a \"default:\" statement
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Wswitch-enum
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Common
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Warn about all enumerated switches missing a specific case
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Wsystem-headers
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Common
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Do not suppress warnings from system headers
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Wuninitialized
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Common
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Warn about uninitialized automatic variables
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Wunreachable-code
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Common
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Warn about code that will never be executed
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Wunused
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Common
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Enable all -Wunused- warnings
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Wunused-function
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Common
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Warn when a function is unused
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Wunused-label
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Common
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Warn when a label is unused
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Wunused-parameter
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Common
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Warn when a function parameter is unused
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Wunused-value
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Common
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Warn when an expression value is unused
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Wunused-variable
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Common
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Warn when a variable is unused
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aux-info
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Common Separate
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-aux-info <file> Emit declaration information into <file>
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aux-info=
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Common Joined
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auxbase
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Common Separate
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auxbase-strip
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Common Separate
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d
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Common Joined
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-d<letters> Enable dumps from specific passes of the compiler
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dumpbase
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Common Separate
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-dumpbase <file> Set the file basename to be used for dumps
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fPIC
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Common
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fPIE
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Common
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fabi-version=
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Common Joined UInteger
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falign-functions
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Common
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Align the start of functions
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falign-functions=
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Common RejectNegative Joined UInteger
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falign-jumps
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Common
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Align labels which are only reached by jumping
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falign-jumps=
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Common RejectNegative Joined UInteger
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falign-labels
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Common
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Align all labels
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falign-labels=
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Common RejectNegative Joined UInteger
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falign-loops
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Common
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Align the start of loops
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falign-loops=
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Common RejectNegative Joined UInteger
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fargument-alias
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Common
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Specify that arguments may alias each other and globals
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fargument-noalias
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Common
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Assume arguments may alias globals but not each other
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fargument-noalias-global
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Common
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Assume arguments alias neither each other nor globals
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fasynchronous-unwind-tables
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Common
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Generate unwind tables that are exact at each instruction boundary
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fbounds-check
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Common
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Generate code to check bounds before indexing arrays
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fbranch-count-reg
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Common
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Replace add, compare, branch with branch on count register
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fbranch-probabilities
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Common
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Use profiling information for branch probabilities
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fbranch-target-load-optimize
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Common
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Perform branch target load optimization before prologue / epilogue threading
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fbranch-target-load-optimize2
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Common
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Perform branch target load optimization after prologue / epilogue threading
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fcall-saved-
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Common Joined RejectNegative
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-fcall-saved-<register> Mark <register> as being preserved across functions
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fcall-used-
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Common Joined RejectNegative
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-fcall-used-<register> Mark <register> as being corrupted by function calls
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fcaller-saves
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Common
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Save registers around function calls
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fcommon
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Common
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Do not put uninitialized globals in the common section
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fcprop-registers
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Common
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Perform a register copy-propagation optimization pass
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fcrossjumping
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Common
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Perform cross-jumping optimization
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fcse-follow-jumps
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Common
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When running CSE, follow jumps to their targets
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fcse-skip-blocks
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Common
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When running CSE, follow conditional jumps
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fdata-sections
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Common
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Place data items into their own section
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fdefer-pop
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Common
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Defer popping functions args from stack until later
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fdelayed-branch
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Common
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Attempt to fill delay slots of branch instructions
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fdelete-null-pointer-checks
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Common
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Delete useless null pointer checks
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fdiagnostics-show-location=
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Common Joined RejectNegative
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-fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
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fdump-unnumbered
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Common
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Suppress output of instruction numbers and line number notes in debugging dumps
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feliminate-dwarf2-dups
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Common
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Perform DWARF2 duplicate elimination
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feliminate-unused-debug-symbols
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Common
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Perform unused type elimination in debug info
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feliminate-unused-debug-types
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Common
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Perform unused type elimination in debug info
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fexceptions
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Common
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Enable exception handling
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fexpensive-optimizations
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Common
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Perform a number of minor, expensive optimizations
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ffast-math
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Common
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ffinite-math-only
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Common
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Assume no NaNs or infinities are generated
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ffixed-
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Common Joined RejectNegative
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-ffixed-<register> Mark <register> as being unavailable to the compiler
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ffloat-store
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Common
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Do not store floats in registers
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fforce-addr
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Common
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Copy memory address constants into registers before use
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fforce-mem
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Common
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Copy memory operands into registers before use
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ffunction-cse
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Common
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Allow function addresses to be held in registers
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ffunction-sections
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Common
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Place each function into its own section
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fgcse
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Common
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Perform global common subexpression elimination
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fgcse-lm
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Common
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Perform enhanced load motion during global common subexpression elimination
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fgcse-sm
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Common
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Perform store motion after global common subexpression elimination
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fgcse-las
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Common
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Perform redundant load after store elimination in global common subexpression elimination
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fguess-branch-probability
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Common
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Enable guessing of branch probabilities
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fident
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Common
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Process #ident directives
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fif-conversion
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Common
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Perform conversion of conditional jumps to branchless equivalents
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fif-conversion2
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Common
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Perform conversion of conditional jumps to conditional execution
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finhibit-size-directive
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Common
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Do not generate .size directives
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finline
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Common
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Pay attention to the \"inline\" keyword
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finline-functions
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Common
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Integrate simple functions into their callers
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finline-limit-
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Common RejectNegative Joined UInteger
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finline-limit=
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Common RejectNegative Joined UInteger
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-finline-limit=<number> Limit the size of inlined functions to <number>
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finstrument-functions
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Common
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Instrument function entry and exit with profiling calls
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fkeep-inline-functions
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Common
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Generate code for functions even if they are fully inlined
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fkeep-static-consts
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Common
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Emit static const variables even if they are not used
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fleading-underscore
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Common
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Give external symbols a leading underscore
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floop-optimize
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Common
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Perform loop optimizations
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fmath-errno
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Common
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Set errno after built-in math functions
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fmem-report
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Common
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Report on permanent memory allocation
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fmerge-all-constants
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Common
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Attempt to merge identical constants and constant variables
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fmerge-constants
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Common
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Attempt to merge identical constants across compilation units
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fmessage-length=
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Common RejectNegative Joined UInteger
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-fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
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fmove-all-movables
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Common
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Force all loop invariant computations out of loops
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fnew-ra
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Common
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Use graph-coloring register allocation
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fnon-call-exceptions
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Common
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Support synchronous non-call exceptions
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fold-unroll-loops
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Common
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Perform loop unrolling when iteration count is known
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fold-unroll-all-loops
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Common
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Perform loop unrolling for all loops
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fomit-frame-pointer
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Common
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When possible do not generate stack frames
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foptimize-register-move
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Common
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Do the full register move optimization pass
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foptimize-sibling-calls
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Common
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Optimize sibling and tail recursive calls
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fpack-struct
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Common
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Pack structure members together without holes
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fpcc-struct-return
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Common
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Return small aggregates in memory, not registers
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fpeel-loops
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Common
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Perform loop peeling
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fpeephole
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Common
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Enable machine specific peephole optimizations
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fpeephole2
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Common
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Enable an RTL peephole pass before sched2
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fpic
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Common
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Generate position-independent code if possible
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fpie
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Common
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Generate position-independent code for executables if possible
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fprefetch-loop-arrays
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Common
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Generate prefetch instructions, if available, for arrays in loops
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fprofile
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Common
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Enable basic program profiling code
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fprofile-arcs
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Common
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Insert arc-based program profiling code
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fprofile-generate
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Common
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Enable common options for generating profile info for profile feedback directed optimizations
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fprofile-use
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Common
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Enable common options for performing profile feedback directed optimizations
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fprofile-values
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Common
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Insert code to profile values of expressions
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frandom-seed
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Common
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frandom-seed=
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Common Joined RejectNegative
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-frandom-seed=<string> Make compile reproducible using <string>
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freduce-all-givs
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Common
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Strength reduce all loop general induction variables
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freg-struct-return
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Common
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Return small aggregates in registers
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fregmove
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Common
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Enables a register move optimization
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frename-registers
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Common
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Perform a register renaming optimization pass
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freorder-blocks
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Common
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Reorder basic blocks to improve code placement
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freorder-functions
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Common
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Reorder functions to improve code placement
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frerun-cse-after-loop
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Common
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Add a common subexpression elimination pass after loop optimizations
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frerun-loop-opt
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Common
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Run the loop optimizer twice
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frounding-math
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Common
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Disable optimizations that assume default FP rounding behavior
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fsched-interblock
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Common
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Enable scheduling across basic blocks
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fsched-spec
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Common
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Allow speculative motion of non-loads
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fsched-spec-load
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Common
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Allow speculative motion of some loads
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fsched-spec-load-dangerous
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Common
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Allow speculative motion of more loads
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fsched-verbose=
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Common RejectNegative Joined
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-fsched-verbose=<number> Set the verbosity level of the scheduler
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fsched2-use-superblocks
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Common
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If scheduling post reload, do superblock scheduling
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fsched2-use-traces
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Common
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If scheduling post reload, do trace scheduling
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fschedule-insns
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Common
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Reschedule instructions before register allocation
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fschedule-insns2
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Common
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Reschedule instructions after register allocation
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fsched-stalled-insns
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Common
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Allow premature scheduling of queued insns
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fsched-stalled-insns=
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Common RejectNegative Joined UInteger
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-fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
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fsched-stalled-insns-dep
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Common
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Set dependence distance checking in premature scheduling of queued insns
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fsched-stalled-insns-dep=
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Common RejectNegative Joined UInteger
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-fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
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fshared-data
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Common
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Mark data as shared rather than private
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fsignaling-nans
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Common
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Disable optimizations observable by IEEE signaling NaNs
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fsingle-precision-constant
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Common
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Convert floating point constants to single precision constants
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fstack-check
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Common
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Insert stack checking code into the program
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fstack-limit
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Common
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fstack-limit-register=
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Common RejectNegative Joined
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-fstack-limit-register=<register> Trap if the stack goes past <register>
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fstack-limit-symbol=
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Common RejectNegative Joined
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-fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
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fstrength-reduce
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Common
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Perform strength reduction optimizations
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fstrict-aliasing
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Common
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Assume strict aliasing rules apply
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fsyntax-only
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Common
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Check for syntax errors, then stop
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ftest-coverage
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Common
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Create data files needed by \"gcov\"
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fthread-jumps
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Common
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Perform jump threading optimizations
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ftime-report
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Common
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Report the time taken by each compiler pass
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ftls-model=
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Common Joined RejectNegative
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-ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
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ftracer
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Common
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Perform superblock formation via tail duplication
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ftrapping-math
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Common
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Assume floating-point operations can trap
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ftrapv
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Common
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Trap for signed overflow in addition, subtraction and multiplication
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funit-at-a-time
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Common
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Compile whole compilation unit at a time
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funroll-loops
|
|
Common
|
|
Perform loop unrolling when iteration count is known
|
|
|
|
funroll-all-loops
|
|
Common
|
|
Perform loop unrolling for all loops
|
|
|
|
funsafe-math-optimizations
|
|
Common
|
|
Allow math optimizations that may violate IEEE or ISO standards
|
|
|
|
funswitch-loops
|
|
Common
|
|
Perform loop unswitching
|
|
|
|
funwind-tables
|
|
Common
|
|
Just generate unwind tables for exception handling
|
|
|
|
fverbose-asm
|
|
Common
|
|
Add extra commentary to assembler output
|
|
|
|
fvpt
|
|
Common
|
|
Use expression value profiles in optimizations
|
|
|
|
fweb
|
|
Common
|
|
Construct webs and split unrelated uses of single variable
|
|
|
|
fwrapv
|
|
Common
|
|
Assume signed arithmetic overflow wraps around
|
|
|
|
fwritable-strings
|
|
Common
|
|
Store strings in writable data section
|
|
|
|
fzero-initialized-in-bss
|
|
Common
|
|
Put zero initialized data in the bss section
|
|
|
|
g
|
|
Common JoinedOrMissing
|
|
Generate debug information in default format
|
|
|
|
gcoff
|
|
Common JoinedOrMissing
|
|
Generate debug information in COFF format
|
|
|
|
gdwarf-2
|
|
Common JoinedOrMissing
|
|
Generate debug information in DWARF v2 format
|
|
|
|
ggdb
|
|
Common JoinedOrMissing
|
|
Generate debug information in default extended format
|
|
|
|
gstabs
|
|
Common JoinedOrMissing
|
|
Generate debug information in STABS format
|
|
|
|
gstabs+
|
|
Common JoinedOrMissing
|
|
Generate debug information in extended STABS format
|
|
|
|
gvms
|
|
Common JoinedOrMissing
|
|
Generate debug information in VMS format
|
|
|
|
gxcoff
|
|
Common JoinedOrMissing
|
|
Generate debug information in XCOFF format
|
|
|
|
gxcoff+
|
|
Common JoinedOrMissing
|
|
Generate debug information in extended XCOFF format
|
|
|
|
m
|
|
Common Joined
|
|
|
|
o
|
|
Common Joined Separate
|
|
-o <file> Place output into <file>
|
|
|
|
p
|
|
Common
|
|
Enable function profiling
|
|
|
|
pedantic
|
|
Common
|
|
Issue warnings needed for strict compliance to the standard
|
|
|
|
pedantic-errors
|
|
Common
|
|
Like -pedantic but issue them as errors
|
|
|
|
quiet
|
|
Common
|
|
Do not display functions compiled or elapsed time
|
|
|
|
version
|
|
Common
|
|
Display the compiler's version
|
|
|
|
w
|
|
Common
|
|
Suppress warnings
|
|
|
|
; This comment is to ensure we retain the blank line above.
|