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# Copyright 1999-2005 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.104 2006/01/14 10:52:12 kevquinn Exp $
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# need access to emktemp()
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inherit eutils toolchain-funcs multilib
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#
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#### filter-flags <flags> ####
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# Remove particular flags from C[XX]FLAGS
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# Matches only complete flags
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#
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#### append-flags <flags> ####
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# Add extra flags to your current C[XX]FLAGS
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#
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#### replace-flags <orig.flag> <new.flag> ###
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# Replace a flag by another one
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#
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#### replace-cpu-flags <old.cpus> <new.cpu> ###
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# Replace march/mcpu flags that specify <old.cpus>
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# with flags that specify <new.cpu>
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#
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#### is-flag[q] <flag> ####
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# Returns "true" if flag is set in C[XX]FLAGS
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# Matches only complete a flag
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# q version sets return code but doesn't echo
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#
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#### is-ldflag[q] <flag> ####
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# Returns "true" if flag is set in LDFLAGS
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# Matches only complete a flag
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# q version sets return code but doesn't echo
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#
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#### strip-flags ####
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# Strip C[XX]FLAGS of everything except known
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# good options.
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#
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#### strip-unsupported-flags ####
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# Strip C[XX]FLAGS of any flags not supported by
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# installed version of gcc
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#
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#### get-flag <flag> ####
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# Find and echo the value for a particular flag
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#
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#### replace-sparc64-flags ####
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# Sets mcpu to v8 and uses the original value
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# as mtune if none specified.
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#
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#### filter-mfpmath <math types> ####
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# Remove specified math types from the fpmath specification
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# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
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# will leave the user with -mfpmath=386
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#
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#### append-ldflags ####
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# Add extra flags to your current LDFLAGS
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#
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#### filter-ldflags <flags> ####
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# Remove particular flags from LDFLAGS
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# Matches only complete flags
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#
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#### bindnow-flags ####
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# Returns the flags to enable "now" binding in the current selected linker.
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#
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################ DEPRECATED functions ################
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# The following are still present to avoid breaking existing
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# code more than necessary; however they are deprecated. Please
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# use gcc-specs-* from toolchain-funcs.eclass instead, if you
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# need to know which hardened techs are active in the compiler.
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# See bug #100974
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#
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#### has_hardened ####
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# Returns true if the compiler has 'Hardened' in its version string,
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# (note; switched-spec vanilla compilers satisfy this condition) or
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# the specs file name contains 'hardened'.
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#
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#### has_pie ####
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# Returns true if the compiler by default or with current CFLAGS
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# builds position-independent code.
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#
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#### has_pic ####
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# Returns true if the compiler by default or with current CFLAGS
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# builds position-independent code.
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#
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#### has_ssp_all ####
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# Returns true if the compiler by default or with current CFLAGS
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# generates stack smash protections for all functions
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#
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#### has_ssp ####
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# Returns true if the compiler by default or with current CFLAGS
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# generates stack smash protections for most vulnerable functions
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#
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# C[XX]FLAGS that we allow in strip-flags
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setup-allowed-flags() {
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if [[ -z ${ALLOWED_FLAGS} ]] ; then
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export ALLOWED_FLAGS="-pipe"
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
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fi
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# allow a bunch of flags that negate features / control ABI
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ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
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ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
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-mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
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-mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
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-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
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-mieee -mieee-with-inexact \
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-mtls-direct-seg-refs -mno-tls-direct-seg-refs \
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-mflat -mno-flat -mno-faster-structs -mfaster-structs \
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-m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
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-mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
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# C[XX]FLAGS that we are think is ok, but needs testing
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# NOTE: currently -Os have issues with gcc3 and K6* arch's
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export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
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return 0
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}
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# inverted filters for hardened compiler. This is trying to unpick
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# the hardened compiler defaults.
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_filter-hardened() {
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local f
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for f in "$@" ; do
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case "${f}" in
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# Ideally we should only concern ourselves with PIE flags,
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# not -fPIC or -fpic, but too many places filter -fPIC without
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# thinking about -fPIE.
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-fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
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gcc-specs-pie || continue
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is-flagq -nopie || append-flags -nopie;;
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-fstack-protector)
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gcc-specs-ssp || continue
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is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
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-fstack-protector-all)
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gcc-specs-ssp-to-all || continue
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is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
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esac
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done
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}
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# Remove occurrences of strings from variable given in $1
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# Strings removed are matched as globs, so for example
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# '-O*' would remove -O1, -O2 etc.
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_filter-var() {
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local f x VAR VAL
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declare -a new
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VAR=$1
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shift
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eval VAL=\${${VAR}}
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for f in ${VAL}; do
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for x in "$@"; do
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# Note this should work with globs like -O*
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[[ ${f} == ${x} ]] && continue 2
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done
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eval new\[\${\#new\[@]}]=\${f}
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done
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eval export ${VAR}=\${new\[*]}
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}
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filter-flags() {
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_filter-hardened "$@"
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_filter-var CFLAGS "$@"
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_filter-var CXXFLAGS "$@"
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return 0
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}
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filter-lfs-flags() {
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[[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
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filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
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}
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append-lfs-flags() {
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[[ -n $@ ]] && die "append-lfs-flags takes no arguments"
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append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
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}
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append-flags() {
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[[ -z $* ]] && return 0
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export CFLAGS="${CFLAGS} $*"
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export CXXFLAGS="${CXXFLAGS} $*"
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return 0
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}
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replace-flags() {
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[[ $# != 2 ]] \
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&& echo && eerror "Usage: replace-flags <old flag> <new flag>" \
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&& die "replace-flags takes 2 arguments, not $#"
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local f fset
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declare -a new_CFLAGS new_CXXFLAGS
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for fset in CFLAGS CXXFLAGS; do
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# Looping over the flags instead of using a global
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# substitution ensures that we're working with flag atoms.
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# Otherwise globs like -O* have the potential to wipe out the
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# list of flags.
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for f in ${!fset}; do
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# Note this should work with globs like -O*
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[[ ${f} == ${1} ]] && f=${2}
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eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
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done
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eval export ${fset}=\${new_${fset}\[*]}
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done
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return 0
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}
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replace-cpu-flags() {
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local newcpu="$#" ; newcpu="${!newcpu}"
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while [ $# -gt 1 ] ; do
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# quote to make sure that no globbing is done (particularly on
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# ${oldcpu} prior to calling replace-flags
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replace-flags "-march=${1}" "-march=${newcpu}"
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replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
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replace-flags "-mtune=${1}" "-mtune=${newcpu}"
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shift
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done
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return 0
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}
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is-flagq() {
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local x
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for x in ${CFLAGS} ${CXXFLAGS} ; do
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# Note this should work with globs like -mcpu=ultrasparc*
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if [[ ${x} == ${1} ]]; then
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return 0
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fi
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done
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return 1
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}
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is-flag() {
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if is-flagq ${1}; then
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echo true
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return 0
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fi
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return 1
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}
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is-ldflagq() {
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local x
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for x in ${LDFLAGS} ; do
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# Note this should work with globs like -mcpu=ultrasparc*
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if [[ ${x} == ${1} ]]; then
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return 0
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fi
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done
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return 1
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}
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is-ldflag() {
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if is-ldflagq ${1}; then
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echo true
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return 0
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fi
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return 1
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}
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filter-mfpmath() {
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local orig_mfpmath new_math prune_math
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# save the original -mfpmath flag
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orig_mfpmath="`get-flag -mfpmath`"
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# get the value of the current -mfpmath flag
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new_math=" `get-flag mfpmath | tr , ' '` "
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# figure out which math values are to be removed
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prune_math=""
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for prune_math in "$@" ; do
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new_math="${new_math/ ${prune_math} / }"
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done
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new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
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if [ -z "${new_math}" ] ; then
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# if we're removing all user specified math values are
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# slated for removal, then we just filter the flag
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filter-flags ${orig_mfpmath}
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else
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# if we only want to filter some of the user specified
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# math values, then we replace the current flag
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replace-flags ${orig_mfpmath} -mfpmath=${new_math}
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fi
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return 0
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}
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strip-flags() {
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local x y flag NEW_CFLAGS NEW_CXXFLAGS
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setup-allowed-flags
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local NEW_CFLAGS=""
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local NEW_CXXFLAGS=""
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# Allow unstable C[XX]FLAGS if we are using unstable profile ...
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if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
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ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
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fi
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set -f # disable pathname expansion
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for x in ${CFLAGS}; do
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for y in ${ALLOWED_FLAGS}; do
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flag=${x%%=*}
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if [ "${flag%%${y}}" = "" ] ; then
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NEW_CFLAGS="${NEW_CFLAGS} ${x}"
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break
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fi
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done
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done
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for x in ${CXXFLAGS}; do
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for y in ${ALLOWED_FLAGS}; do
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flag=${x%%=*}
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if [ "${flag%%${y}}" = "" ] ; then
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NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
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break
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fi
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done
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done
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# In case we filtered out all optimization flags fallback to -O2
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if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
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NEW_CFLAGS="${NEW_CFLAGS} -O2"
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fi
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if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
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NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
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fi
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set +f # re-enable pathname expansion
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export CFLAGS="${NEW_CFLAGS}"
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export CXXFLAGS="${NEW_CXXFLAGS}"
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return 0
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}
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test-flag-PROG() {
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local comp=$1
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local flags="$2"
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[[ -z ${comp} || -z ${flags} ]] && \
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return 1
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local PROG=$(tc-get${comp})
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${PROG} ${flags} -S -o /dev/null -xc /dev/null \
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> /dev/null 2>&1
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}
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# Returns true if C compiler support given flag
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test-flag-CC() { test-flag-PROG "CC" "$1"; }
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# Returns true if C++ compiler support given flag
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test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
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test-flags-PROG() {
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local comp=$1
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local flags
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local x
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shift
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[[ -z ${comp} ]] && \
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return 1
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| 368 |
for x in "$@" ; do
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test-flag-${comp} "${x}" && flags="${flags} ${x}"
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done
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echo "${flags}"
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# Just bail if we dont have any flags
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[[ -n ${flags} ]]
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}
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# Returns (echo's) the given flags supported by the C compiler
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| 379 |
test-flags-CC() { test-flags-PROG "CC" "$@"; }
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| 380 |
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| 381 |
# Returns (echo's) the given flags supported by the C++ compiler
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test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
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| 383 |
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| 384 |
# Short-hand that should hopefully work for both C and C++ compiler, but
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| 385 |
# its really only present due to the append-flags() abomination.
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test-flags() { test-flags-CC "$@"; }
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| 387 |
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| 388 |
# Depriciated, use test-flags()
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test_flag() {
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| 390 |
ewarn "test_flag: deprecated, please use test-flags()!" >&2
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| 391 |
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| 392 |
test-flags-CC "$@"
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}
|
| 394 |
|
| 395 |
test_version_info() {
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| 396 |
if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
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| 397 |
return 0
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| 398 |
else
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return 1
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| 400 |
fi
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| 401 |
}
|
| 402 |
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| 403 |
strip-unsupported-flags() {
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| 404 |
local x NEW_CFLAGS NEW_CXXFLAGS
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| 405 |
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| 406 |
for x in ${CFLAGS} ; do
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| 407 |
NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})"
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| 408 |
done
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| 409 |
for x in ${CXXFLAGS} ; do
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| 410 |
NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
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| 411 |
done
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| 412 |
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| 413 |
export CFLAGS=${NEW_CFLAGS}
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export CXXFLAGS=${NEW_CXXFLAGS}
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| 415 |
}
|
| 416 |
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get-flag() {
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| 418 |
local f findflag="$1"
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| 419 |
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| 420 |
# this code looks a little flaky but seems to work for
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| 421 |
# everything we want ...
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| 422 |
# for example, if CFLAGS="-march=i686":
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# `get-flag -march` == "-march=i686"
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# `get-flag march` == "i686"
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| 425 |
for f in ${CFLAGS} ${CXXFLAGS} ; do
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| 426 |
if [ "${f/${findflag}}" != "${f}" ] ; then
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printf "%s\n" "${f/-${findflag}=}"
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return 0
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| 429 |
fi
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| 430 |
done
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| 431 |
return 1
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| 432 |
}
|
| 433 |
|
| 434 |
# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
|
| 435 |
has_hardened() {
|
| 436 |
ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
|
| 437 |
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| 438 |
test_version_info Hardened && return 0
|
| 439 |
# The specs file wont exist unless gcc has GCC_SPECS support
|
| 440 |
[[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
|
| 441 |
}
|
| 442 |
|
| 443 |
# DEPRECATED - use gcc-specs-pie from toolchain-funcs
|
| 444 |
# indicate whether PIC is set
|
| 445 |
has_pic() {
|
| 446 |
ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
|
| 447 |
|
| 448 |
[[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
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| 449 |
${CFLAGS/-fpic} != ${CFLAGS} ]] || \
|
| 450 |
gcc-specs-pie
|
| 451 |
}
|
| 452 |
|
| 453 |
# DEPRECATED - use gcc-specs-pie from toolchain-funcs
|
| 454 |
# indicate whether PIE is set
|
| 455 |
has_pie() {
|
| 456 |
ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
|
| 457 |
|
| 458 |
[[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
|
| 459 |
${CFLAGS/-fpie} != ${CFLAGS} ]] || \
|
| 460 |
gcc-specs-pie
|
| 461 |
}
|
| 462 |
|
| 463 |
# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
|
| 464 |
# indicate whether code for SSP is being generated for all functions
|
| 465 |
has_ssp_all() {
|
| 466 |
ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
|
| 467 |
|
| 468 |
# note; this matches only -fstack-protector-all
|
| 469 |
[[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
|
| 470 |
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
|
| 471 |
gcc-specs-ssp-all
|
| 472 |
}
|
| 473 |
|
| 474 |
# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
|
| 475 |
# indicate whether code for SSP is being generated
|
| 476 |
has_ssp() {
|
| 477 |
ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
|
| 478 |
|
| 479 |
# note; this matches both -fstack-protector and -fstack-protector-all
|
| 480 |
[[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
|
| 481 |
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
|
| 482 |
gcc-specs-ssp
|
| 483 |
}
|
| 484 |
|
| 485 |
has_m64() {
|
| 486 |
# this doesnt test if the flag is accepted, it tests if the flag
|
| 487 |
# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
|
| 488 |
# please dont replace this function with test_flag in some future
|
| 489 |
# clean-up!
|
| 490 |
|
| 491 |
local temp="$(emktemp)"
|
| 492 |
echo "int main() { return(0); }" > "${temp}".c
|
| 493 |
MY_CC=$(tc-getCC)
|
| 494 |
${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
|
| 495 |
local ret=$?
|
| 496 |
rm -f "${temp}".c
|
| 497 |
[[ ${ret} != 1 ]] && return 0
|
| 498 |
return 1
|
| 499 |
}
|
| 500 |
|
| 501 |
has_m32() {
|
| 502 |
# this doesnt test if the flag is accepted, it tests if the flag
|
| 503 |
# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
|
| 504 |
# please dont replace this function with test_flag in some future
|
| 505 |
# clean-up!
|
| 506 |
|
| 507 |
[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
|
| 508 |
|
| 509 |
local temp=$(emktemp)
|
| 510 |
echo "int main() { return(0); }" > "${temp}".c
|
| 511 |
MY_CC=$(tc-getCC)
|
| 512 |
${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
|
| 513 |
local ret=$?
|
| 514 |
rm -f "${temp}".c
|
| 515 |
[[ ${ret} != 1 ]] && return 0
|
| 516 |
return 1
|
| 517 |
}
|
| 518 |
|
| 519 |
replace-sparc64-flags() {
|
| 520 |
local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
|
| 521 |
|
| 522 |
if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
|
| 523 |
for x in ${SPARC64_CPUS}; do
|
| 524 |
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
|
| 525 |
done
|
| 526 |
else
|
| 527 |
for x in ${SPARC64_CPUS}; do
|
| 528 |
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
|
| 529 |
done
|
| 530 |
fi
|
| 531 |
|
| 532 |
if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
|
| 533 |
for x in ${SPARC64_CPUS}; do
|
| 534 |
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
|
| 535 |
done
|
| 536 |
else
|
| 537 |
for x in ${SPARC64_CPUS}; do
|
| 538 |
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
|
| 539 |
done
|
| 540 |
fi
|
| 541 |
|
| 542 |
export CFLAGS CXXFLAGS
|
| 543 |
}
|
| 544 |
|
| 545 |
append-ldflags() {
|
| 546 |
[[ -z $* ]] && return 0
|
| 547 |
export LDFLAGS="${LDFLAGS} $*"
|
| 548 |
return 0
|
| 549 |
}
|
| 550 |
|
| 551 |
# Remove flags from LDFLAGS - it's up to the ebuild to filter
|
| 552 |
# CFLAGS and CXXFLAGS via filter-flags if they need to.
|
| 553 |
filter-ldflags() {
|
| 554 |
_filter-var LDFLAGS "$@"
|
| 555 |
return 0
|
| 556 |
}
|
| 557 |
|
| 558 |
# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
|
| 559 |
# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
|
| 560 |
# to gcc where it needs the '-Wl,'.
|
| 561 |
raw-ldflags() {
|
| 562 |
local x input="$@"
|
| 563 |
[[ -z ${input} ]] && input=${LDFLAGS}
|
| 564 |
set --
|
| 565 |
for x in ${input} ; do
|
| 566 |
x=${x#-Wl,}
|
| 567 |
set -- "$@" ${x//,/ }
|
| 568 |
done
|
| 569 |
echo "$@"
|
| 570 |
}
|
| 571 |
|
| 572 |
# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
|
| 573 |
# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
|
| 574 |
# fixes.
|
| 575 |
#
|
| 576 |
# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
|
| 577 |
gcc2-flags() {
|
| 578 |
if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
|
| 579 |
CFLAGS=${CFLAGS//-mtune=/-mcpu=}
|
| 580 |
CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
|
| 581 |
fi
|
| 582 |
|
| 583 |
replace-cpu-flags k6-{2,3} k6
|
| 584 |
replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
|
| 585 |
|
| 586 |
replace-cpu-flags pentium-mmx i586
|
| 587 |
replace-cpu-flags pentium{2,3,4} i686
|
| 588 |
|
| 589 |
replace-cpu-flags ev6{7,8} ev6
|
| 590 |
|
| 591 |
export CFLAGS CXXFLAGS
|
| 592 |
}
|
| 593 |
|
| 594 |
# Gets the flags needed for "NOW" binding
|
| 595 |
bindnow-flags() {
|
| 596 |
case $($(tc-getLD) -v 2>&1 </dev/null) in
|
| 597 |
*GNU* | *'with BFD'*) # GNU ld
|
| 598 |
echo "-Wl,-z,now" ;;
|
| 599 |
*Apple*) # Darwin ld
|
| 600 |
echo "-bind_at_load" ;;
|
| 601 |
*)
|
| 602 |
# Some linkers just recognize -V instead of -v
|
| 603 |
case $($(tc-getLD) -V 2>&1 </dev/null) in
|
| 604 |
*Solaris*) # Solaris accept almost the same GNU options
|
| 605 |
echo "-Wl,-z,now" ;;
|
| 606 |
esac
|
| 607 |
;;
|
| 608 |
esac
|
| 609 |
}
|
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