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# Copyright 1999-2004 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 1.62 2004/07/15 04:59:44 lv Exp $ |
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# |
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# Author Bart Verwilst <verwilst@gentoo.org> |
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|
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ECLASS=flag-o-matic |
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INHERITED="$INHERITED $ECLASS" |
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|
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IUSE="debug" |
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|
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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 <new.cpu> <old.cpus> ### |
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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 <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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# |
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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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#### etexec-flags #### |
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# hooked function for hardened gcc that appends |
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# -fno-pic to {C,CXX,LD}FLAGS |
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# when a package is filtering -fpic, -fPIC, -fpie, -fPIE |
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# |
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#### fstack-flags #### |
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# hooked function for hardened gcc that appends |
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# -fno-stack-protector to {C,CXX,LD}FLAGS |
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# when a package is filtering -fstack-protector, -fstack-protector-all |
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# notice: modern automatic specs files will also suppress -fstack-protector-all |
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# when only -fno-stack-protector is given |
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# |
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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="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g" |
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case "${ARCH}" in |
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mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;; |
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amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;; |
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x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;; |
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alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; |
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ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; |
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esac |
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fi |
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|
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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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|
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filter-flags() { |
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local x f fset |
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declare -a new_CFLAGS new_CXXFLAGS |
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|
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for x in "$@" ; do |
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case "${x}" in |
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-fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;; |
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-fstack-protector|-fstack-protector-all) fstack-flags;; |
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esac |
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done |
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|
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for fset in CFLAGS CXXFLAGS; do |
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for f in ${!fset}; do |
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for x in "$@"; do |
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# Note this should work with globs like -O* |
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[[ ${f} == ${x} ]] && continue 2 |
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done |
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eval new_${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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|
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return 0 |
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} |
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|
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filter-lfs-flags() { |
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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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|
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append-lfs-flags() { |
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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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|
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append-flags() { |
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export CFLAGS="${CFLAGS} $*" |
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export CXXFLAGS="${CXXFLAGS} $*" |
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[ -n "`is-flag -fno-stack-protector`" -o \ |
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-n "`is-flag -fno-stack-protector-all`" ] && fstack-flags |
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return 0 |
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} |
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|
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replace-flags() { |
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# we do this fancy spacing stuff so as to not filter |
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# out part of a flag ... we want flag atoms ! :D |
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CFLAGS=" ${CFLAGS} " |
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CXXFLAGS=" ${CXXFLAGS} " |
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CFLAGS="${CFLAGS// ${1} / ${2} }" |
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CXXFLAGS="${CXXFLAGS// ${1} / ${2} }" |
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CFLAGS="${CFLAGS:1:${#CFLAGS}-2}" |
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CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}" |
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export CFLAGS CXXFLAGS |
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return 0 |
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} |
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|
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replace-cpu-flags() { |
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local oldcpu newcpu="$1" ; shift |
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for oldcpu in "$@" ; do |
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replace-flags -march=${oldcpu} -march=${newcpu} |
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replace-flags -mcpu=${oldcpu} -mcpu=${newcpu} |
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replace-flags -mtune=${oldcpu} -mtune=${newcpu} |
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done |
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return 0 |
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} |
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|
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is-flag() { |
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local x |
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|
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for x in ${CFLAGS} ${CXXFLAGS} ; do |
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if [ "${x}" == "$1" ] ; then |
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echo true |
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return 0 |
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fi |
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done |
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return 1 |
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} |
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|
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filter-mfpmath() { |
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local orig_mfpmath new_math prune_math |
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# save the original -mfpmath flag |
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orig_mfpmath="`get-flag -mfpmath`" |
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# get the value of the current -mfpmath flag |
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new_math=" `get-flag mfpmath | tr , ' '` " |
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# figure out which math values are to be removed |
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prune_math="" |
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for prune_math in "$@" ; 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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|
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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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|
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strip-flags() { |
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local x y flag NEW_CFLAGS NEW_CXXFLAGS |
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|
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setup-allowed-flags |
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|
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local NEW_CFLAGS="" |
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local NEW_CXXFLAGS="" |
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|
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# Allow unstable C[XX]FLAGS if we are using unstable profile ... |
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if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then |
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use debug && einfo "Enabling the use of some unstable flags" |
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ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" |
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fi |
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|
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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}}" = "" ] || [ "${flag:0:5}" = "-fno-" ] || [ "${flag:0:5}" = "-mno-" ] ; 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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|
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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}}" = "" ] || [ "${flag:0:5}" = "-fno-" ] || [ "${flag:0:5}" = "-mno-" ] ; 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="${NEW_CXXFLAGS}" |
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return 0 |
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} |
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|
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test_flag() { |
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local cc=${CC:-gcc} ; cc=${cc%% *} |
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if ${cc} -S -xc "$@" -o /dev/null /dev/null &>/dev/null; then |
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printf "%s\n" "$*" |
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return 0 |
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fi |
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return 1 |
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} |
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|
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test_version_info() { |
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local cc=${CC:-gcc} ; cc=${cc%% *} |
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if [[ $(${cc} --version 2>&1) == *$1* ]]; then |
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return 0 |
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else |
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return 1 |
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fi |
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} |
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|
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strip-unsupported-flags() { |
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local NEW_CFLAGS NEW_CXXFLAGS |
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|
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for x in ${CFLAGS} ; do |
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NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`" |
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done |
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for x in ${CXXFLAGS} ; do |
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NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`" |
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done |
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export CFLAGS="${NEW_CFLAGS}" |
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export CXXFLAGS="${NEW_CXXFLAGS}" |
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} |
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|
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get-flag() { |
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local f findflag="$1" |
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|
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# this code looks a little flaky but seems to work for |
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# everything we want ... |
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# 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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for f in ${CFLAGS} ${CXXFLAGS} ; do |
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if [ "${f/${findflag}}" != "${f}" ] ; then |
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printf "%s\n" "${f/-${findflag}=}" |
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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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|
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has_hardened() { |
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test_version_info Hardened |
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return $? |
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} |
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|
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has_pic() { |
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[ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0 |
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[ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0 |
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test_version_info pie && return 0 |
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return 1 |
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} |
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|
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has_pie() { |
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[ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0 |
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[ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0 |
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test_version_info pie && return 0 |
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return 1 |
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} |
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|
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has_ssp() { |
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[ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0 |
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test_version_info ssp && return 0 |
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return 1 |
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} |
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|
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has_m64() { |
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# this doesnt test if the flag is accepted, it tests if the flag |
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# actually -WORKS-. non-multilib gcc will take both -m32 and -m64! |
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# please dont replace this function with test_flag in some future |
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# clean-up! |
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temp=`mktemp` |
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echo "int main() { return(0); }" > ${temp}.c |
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${CC/ .*/} -m64 -o /dev/null ${temp}.c > /dev/null 2>&1 |
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ret=$? |
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rm -f ${temp}.c |
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[ "$ret" != "1" ] && return 0 |
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return 1 |
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} |
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|
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has_m32() { |
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# this doesnt test if the flag is accepted, it tests if the flag |
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# actually -WORKS-. non-multilib gcc will take both -m32 and -m64! |
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# please dont replace this function with test_flag in some future |
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# clean-up! |
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temp=`mktemp` |
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echo "int main() { return(0); }" > ${temp}.c |
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${CC/ .*/} -m32 -o /dev/null ${temp}.c > /dev/null 2>&1 |
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ret=$? |
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rm -f ${temp}.c |
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[ "$ret" != "1" ] && return 0 |
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return 1 |
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} |
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|
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replace-sparc64-flags() { |
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local SPARC64_CPUS="ultrasparc v9" |
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|
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if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then |
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for x in ${SPARC64_CPUS}; do |
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CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" |
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done |
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else |
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for x in ${SPARC64_CPUS}; do |
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CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" |
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done |
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fi |
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|
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if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then |
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for x in ${SPARC64_CPUS}; do |
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CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" |
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done |
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else |
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for x in ${SPARC64_CPUS}; do |
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CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" |
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done |
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fi |
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|
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export CFLAGS CXXFLAGS |
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} |
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|
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append-ldflags() { |
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export LDFLAGS="${LDFLAGS} $*" |
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return 0 |
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} |
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|
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filter-ldflags() { |
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local x |
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|
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# we do this fancy spacing stuff so as to not filter |
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# out part of a flag ... we want flag atoms ! :D |
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LDFLAGS=" ${LDFLAGS} " |
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for x in "$@" ; do |
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LDFLAGS="${LDFLAGS// ${x} / }" |
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done |
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LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}" |
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export LDFLAGS |
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return 0 |
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} |
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|
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etexec-flags() { |
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# if you're not using a hardened compiler you wont need this |
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# PIC/no-pic kludge in the first place. |
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has_hardened || return 0 |
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|
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if has_pie || has_pic; then |
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[ -z "`is-flag -fno-pic`" ] && |
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export CFLAGS="${CFLAGS} `test_flag -fno-pic`" |
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[ -z "`is-flag -nopie`" ] && |
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export CFLAGS="${CFLAGS} `test_flag -nopie`" |
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fi |
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return 0 |
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} |
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|
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fstack-flags() { |
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if has_ssp; then |
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[ -z "`is-flag -fno-stack-protector`" ] && |
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export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`" |
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fi |
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return 0 |
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} |
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