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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 1.88 2005/07/06 20:20:03 agriffis 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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# |
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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 <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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#### 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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#### 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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|
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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="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time" |
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export ALLOWED_FLAGS="${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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-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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|
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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) |
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append-flags `test_flag -fno-pie`;; |
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-fstack-protector|-fstack-protector-all) |
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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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# 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 ${!fset}; do |
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for x in "$@"; 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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[[ -z $* ]] && return 0 |
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export CFLAGS="${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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local f fset |
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declare -a new_CFLAGS new_CXXFLAGS |
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|
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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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|
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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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|
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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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# Note this should work with globs like -mcpu=ultrasparc* |
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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 ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then |
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ALLOWED_FLAGS="${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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|
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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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|
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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} ${x}" |
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break |
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fi |
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done |
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done |
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|
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# In case we filtered out all optimization flags fallback to -O2 |
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if [ "${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="${NEW_CXXFLAGS} -O2" |
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fi |
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|
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set +f # re-enable pathname expansion |
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|
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export CFLAGS="${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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if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then |
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printf "%s\n" "$*" |
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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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if [[ $($(tc-getCC) --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 ${x}`" |
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done |
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|
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export CFLAGS="${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 && return 0 |
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# the specs file wont exist unless gcc has GCC_SPECS support |
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[ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \ |
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return 0 |
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return 1 |
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} |
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|
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# indicate whether PIC is set |
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has_pic() { |
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[ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0 |
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[ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0 |
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[ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0 |
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return 1 |
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} |
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|
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# indicate whether PIE is set |
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has_pie() { |
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[ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0 |
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[ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0 |
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[ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0 |
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# test PIC while waiting for specs to be updated to generate __PIE__ |
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[ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0 |
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return 1 |
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} |
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|
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# indicate whether code for SSP is being generated for all functions |
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has_ssp_all() { |
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# note; this matches only -fstack-protector-all |
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[ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0 |
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[ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0 |
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return 1 |
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} |
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|
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# indicate whether code for SSP is being generated |
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has_ssp() { |
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# note; this matches both -fstack-protector and -fstack-protector-all |
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[ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0 |
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[ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0 |
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return 1 |
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} |
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|
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has_m64() { |
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# this doesnt test if the flag is accepted, it tests if the flag |
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# actually -WORKS-. non-multilib gcc will take both -m32 and -m64! |
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# please dont replace this function with test_flag in some future |
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# clean-up! |
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local temp="$(emktemp)" |
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echo "int main() { return(0); }" > ${temp}.c |
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MY_CC=$(tc-getCC) |
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${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1 |
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local ret=$? |
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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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|
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[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0 |
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|
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local temp="$(emktemp)" |
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echo "int main() { return(0); }" > ${temp}.c |
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MY_CC=$(tc-getCC) |
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${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1 |
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local ret=$? |
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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" |
| 395 |
|
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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 |
| 405 |
|
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if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then |
| 407 |
for x in ${SPARC64_CPUS}; do |
| 408 |
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" |
| 409 |
done |
| 410 |
else |
| 411 |
for x in ${SPARC64_CPUS}; do |
| 412 |
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" |
| 413 |
done |
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fi |
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|
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export CFLAGS CXXFLAGS |
| 417 |
} |
| 418 |
|
| 419 |
append-ldflags() { |
| 420 |
export LDFLAGS="${LDFLAGS} $*" |
| 421 |
return 0 |
| 422 |
} |
| 423 |
|
| 424 |
filter-ldflags() { |
| 425 |
local x |
| 426 |
|
| 427 |
# we do this fancy spacing stuff so as to not filter |
| 428 |
# out part of a flag ... we want flag atoms ! :D |
| 429 |
LDFLAGS=" ${LDFLAGS} " |
| 430 |
for x in "$@" ; do |
| 431 |
LDFLAGS=${LDFLAGS// ${x} / } |
| 432 |
done |
| 433 |
[[ -z ${LDFLAGS// } ]] \ |
| 434 |
&& LDFLAGS="" \ |
| 435 |
|| LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2} |
| 436 |
export LDFLAGS |
| 437 |
return 0 |
| 438 |
} |
| 439 |
|
| 440 |
fstack-flags() { |
| 441 |
if has_ssp; then |
| 442 |
[ -z "`is-flag -fno-stack-protector`" ] && |
| 443 |
export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`" |
| 444 |
fi |
| 445 |
return 0 |
| 446 |
} |
| 447 |
|
| 448 |
# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>, |
| 449 |
# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more |
| 450 |
# fixes. |
| 451 |
# |
| 452 |
# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3 |
| 453 |
gcc2-flags() { |
| 454 |
if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then |
| 455 |
CFLAGS=${CFLAGS//-mtune=/-mcpu=} |
| 456 |
CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=} |
| 457 |
fi |
| 458 |
|
| 459 |
replace-cpu-flags k6-{2,3} k6 |
| 460 |
replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686 |
| 461 |
|
| 462 |
replace-cpu-flags pentium-mmx i586 |
| 463 |
replace-cpu-flags pentium{2,3,4} i686 |
| 464 |
|
| 465 |
replace-cpu-flags ev6{7,8} ev6 |
| 466 |
|
| 467 |
export CFLAGS CXXFLAGS |
| 468 |
} |
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