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flag-o-matic.eclass
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flag-o-matic.eclass
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# Copyright 1999-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: flag-o-matic.eclass
# @MAINTAINER:
# @BLURB: common functions to manipulate and query toolchain flags
# @DESCRIPTION:
# This eclass contains a suite of functions to help developers sanely
# and safely manage toolchain flags in their builds.
if [[ -z ${_FLAG_O_MATIC_ECLASS} ]]; then
_FLAG_O_MATIC_ECLASS=1
inherit eutils toolchain-funcs multilib
# Return all the flag variables that our high level funcs operate on.
all-flag-vars() {
echo {ADA,C,CPP,CXX,CCAS,F,FC,LD}FLAGS
}
# {C,CPP,CXX,CCAS,F,FC,LD}FLAGS that we allow in strip-flags
# Note: shell globs and character lists are allowed
setup-allowed-flags() {
ALLOWED_FLAGS=(
-pipe -O '-O[12sg]' -mcpu -march -mtune
'-fstack-protector*' '-fsanitize*' '-fstack-check*' -fno-stack-check
-fbounds-check -fbounds-checking -fno-strict-overflow
-fno-PIE -fno-pie -nopie -no-pie -fno-unit-at-a-time
-g '-g[0-9]' -ggdb '-ggdb[0-9]' '-gdwarf-*' gstabs -gstabs+ -gz
-fno-ident -fpermissive -frecord-gcc-switches
'-fdiagnostics*' '-fplugin*'
'-W*' -w
# CPPFLAGS and LDFLAGS
'-[DUILR]*' '-Wl,*'
# Linker choice flag
'-fuse-ld'
)
# allow a bunch of flags that negate features / control ABI
ALLOWED_FLAGS+=(
'-fno-stack-protector*' '-fabi-version=*'
-fno-strict-aliasing -fno-bounds-check -fno-bounds-checking -fstrict-overflow
-fno-omit-frame-pointer '-fno-builtin*'
)
ALLOWED_FLAGS+=(
-mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse
-mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2
-mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt
-mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt
-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu
-mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe
-mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat
-mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi
-mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel
-mstack-bias -mno-stack-bias -msecure-plt '-m*-toc' -mfloat-abi
-mfix-r10000 -mno-fix-r10000 -mthumb -marm
# gcc 4.5
-mno-fma4 -mno-movbe -mno-xop -mno-lwp
# gcc 4.6
-mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm
# gcc 4.7
-mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt
# gcc 4.8
-mno-fxsr -mno-hle -mno-rtm -mno-xsave -mno-xsaveopt
# gcc 4.9
-mno-avx512cd -mno-avx512er -mno-avx512f -mno-avx512pf -mno-sha
)
}
# inverted filters for hardened compiler. This is trying to unpick
# the hardened compiler defaults.
_filter-hardened() {
local f
for f in "$@" ; do
case "${f}" in
# Ideally we should only concern ourselves with PIE flags,
# not -fPIC or -fpic, but too many places filter -fPIC without
# thinking about -fPIE.
-fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
gcc-specs-pie || continue
if ! is-flagq -nopie && ! is-flagq -no-pie ; then
# Support older Gentoo form first (-nopie) before falling
# back to the official gcc-6+ form (-no-pie).
if test-flags -nopie >/dev/null ; then
append-flags -nopie
else
append-flags -no-pie
fi
fi
;;
-fstack-protector)
gcc-specs-ssp || continue
is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
-fstack-protector-all)
gcc-specs-ssp-to-all || continue
is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
-fno-strict-overflow)
gcc-specs-nostrict || continue
is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
esac
done
}
# Remove occurrences of strings from variable given in $1
# Strings removed are matched as globs, so for example
# '-O*' would remove -O1, -O2 etc.
_filter-var() {
local f x var=$1 new=()
shift
for f in ${!var} ; do
for x in "$@" ; do
# Note this should work with globs like -O*
[[ ${f} == ${x} ]] && continue 2
done
new+=( "${f}" )
done
export ${var}="${new[*]}"
}
# @FUNCTION: filter-flags
# @USAGE: <flags>
# @DESCRIPTION:
# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
filter-flags() {
_filter-hardened "$@"
local v
for v in $(all-flag-vars) ; do
_filter-var ${v} "$@"
done
return 0
}
# @FUNCTION: filter-lfs-flags
# @DESCRIPTION:
# Remove flags that enable Large File Support.
filter-lfs-flags() {
[[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
# http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
# _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
# _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
# _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
}
# @FUNCTION: filter-ldflags
# @USAGE: <flags>
# @DESCRIPTION:
# Remove particular <flags> from LDFLAGS. Accepts shell globs.
filter-ldflags() {
_filter-var LDFLAGS "$@"
return 0
}
# @FUNCTION: append-cppflags
# @USAGE: <flags>
# @DESCRIPTION:
# Add extra <flags> to the current CPPFLAGS.
append-cppflags() {
[[ $# -eq 0 ]] && return 0
export CPPFLAGS+=" $*"
return 0
}
# @FUNCTION: append-cflags
# @USAGE: <flags>
# @DESCRIPTION:
# Add extra <flags> to the current CFLAGS. If a flag might not be supported
# with different compilers (or versions), then use test-flags-CC like so:
# @CODE
# append-cflags $(test-flags-CC -funky-flag)
# @CODE
append-cflags() {
[[ $# -eq 0 ]] && return 0
# Do not do automatic flag testing ourselves. #417047
export CFLAGS+=" $*"
return 0
}
# @FUNCTION: append-cxxflags
# @USAGE: <flags>
# @DESCRIPTION:
# Add extra <flags> to the current CXXFLAGS. If a flag might not be supported
# with different compilers (or versions), then use test-flags-CXX like so:
# @CODE
# append-cxxflags $(test-flags-CXX -funky-flag)
# @CODE
append-cxxflags() {
[[ $# -eq 0 ]] && return 0
# Do not do automatic flag testing ourselves. #417047
export CXXFLAGS+=" $*"
return 0
}
# @FUNCTION: append-fflags
# @USAGE: <flags>
# @DESCRIPTION:
# Add extra <flags> to the current {F,FC}FLAGS. If a flag might not be supported
# with different compilers (or versions), then use test-flags-F77 like so:
# @CODE
# append-fflags $(test-flags-F77 -funky-flag)
# @CODE
append-fflags() {
[[ $# -eq 0 ]] && return 0
# Do not do automatic flag testing ourselves. #417047
export FFLAGS+=" $*"
export FCFLAGS+=" $*"
return 0
}
# @FUNCTION: append-lfs-flags
# @DESCRIPTION:
# Add flags that enable Large File Support.
append-lfs-flags() {
[[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
# see comments in filter-lfs-flags func for meaning of these
append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
}
# @FUNCTION: append-ldflags
# @USAGE: <flags>
# @DESCRIPTION:
# Add extra <flags> to the current LDFLAGS.
append-ldflags() {
[[ $# -eq 0 ]] && return 0
local flag
for flag in "$@"; do
[[ ${flag} == -l* ]] && \
eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
done
export LDFLAGS="${LDFLAGS} $*"
return 0
}
# @FUNCTION: append-flags
# @USAGE: <flags>
# @DESCRIPTION:
# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
append-flags() {
[[ $# -eq 0 ]] && return 0
case " $* " in
*' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
*' '-L*|\
*' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
esac
append-cflags "$@"
append-cxxflags "$@"
append-fflags "$@"
return 0
}
# @FUNCTION: replace-flags
# @USAGE: <old> <new>
# @DESCRIPTION:
# Replace the <old> flag with <new>. Accepts shell globs for <old>.
replace-flags() {
[[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
local f var new
for var in $(all-flag-vars) ; do
# Looping over the flags instead of using a global
# substitution ensures that we're working with flag atoms.
# Otherwise globs like -O* have the potential to wipe out the
# list of flags.
new=()
for f in ${!var} ; do
# Note this should work with globs like -O*
[[ ${f} == ${1} ]] && f=${2}
new+=( "${f}" )
done
export ${var}="${new[*]}"
done
return 0
}
# @FUNCTION: replace-cpu-flags
# @USAGE: <old> <new>
# @DESCRIPTION:
# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
# with flags that select the <new> cpu. Accepts shell globs for <old>.
replace-cpu-flags() {
local newcpu="$#" ; newcpu="${!newcpu}"
while [ $# -gt 1 ] ; do
# quote to make sure that no globbing is done (particularly on
# ${oldcpu}) prior to calling replace-flags
replace-flags "-march=${1}" "-march=${newcpu}"
replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
replace-flags "-mtune=${1}" "-mtune=${newcpu}"
shift
done
return 0
}
_is_flagq() {
local x var="$1[*]"
for x in ${!var} ; do
[[ ${x} == $2 ]] && return 0
done
return 1
}
# @FUNCTION: is-flagq
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
is-flagq() {
[[ -n $2 ]] && die "Usage: is-flag <flag>"
local var
for var in $(all-flag-vars) ; do
_is_flagq ${var} "$1" && return 0
done
return 1
}
# @FUNCTION: is-flag
# @USAGE: <flag>
# @DESCRIPTION:
# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
is-flag() {
is-flagq "$@" && echo true
}
# @FUNCTION: is-ldflagq
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
is-ldflagq() {
[[ -n $2 ]] && die "Usage: is-ldflag <flag>"
_is_flagq LDFLAGS $1
}
# @FUNCTION: is-ldflag
# @USAGE: <flag>
# @DESCRIPTION:
# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
is-ldflag() {
is-ldflagq "$@" && echo true
}
# @FUNCTION: filter-mfpmath
# @USAGE: <math types>
# @DESCRIPTION:
# Remove specified math types from the fpmath flag. For example, if the user
# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
# -mfpmath=386.
filter-mfpmath() {
local orig_mfpmath new_math prune_math
# save the original -mfpmath flag
orig_mfpmath=$(get-flag -mfpmath)
# get the value of the current -mfpmath flag
new_math=$(get-flag mfpmath)
# convert "both" to something we can filter
new_math=${new_math/both/387,sse}
new_math=" ${new_math//[,+]/ } "
# figure out which math values are to be removed
prune_math=""
for prune_math in "$@" ; do
new_math=${new_math/ ${prune_math} / }
done
new_math=$(echo ${new_math})
new_math=${new_math// /,}
if [[ -z ${new_math} ]] ; then
# if we're removing all user specified math values are
# slated for removal, then we just filter the flag
filter-flags ${orig_mfpmath}
else
# if we only want to filter some of the user specified
# math values, then we replace the current flag
replace-flags ${orig_mfpmath} -mfpmath=${new_math}
fi
return 0
}
# @FUNCTION: strip-flags
# @DESCRIPTION:
# Strip *FLAGS of everything except known good/safe flags. This runs over all
# flags returned by all_flag_vars().
strip-flags() {
local x y var
local ALLOWED_FLAGS
setup-allowed-flags
set -f # disable pathname expansion
for var in $(all-flag-vars) ; do
local new=()
for x in ${!var} ; do
local flag=${x%%=*}
for y in "${ALLOWED_FLAGS[@]}" ; do
if [[ -z ${flag%%${y}} ]] ; then
new+=( "${x}" )
break
fi
done
done
# In case we filtered out all optimization flags fallback to -O2
if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
new+=( -O2 )
fi
if [[ ${!var} != "${new[*]}" ]] ; then
einfo "strip-flags: ${var}: changed '${!var}' to '${new[*]}'"
fi
export ${var}="${new[*]}"
done
set +f # re-enable pathname expansion
return 0
}
test-flag-PROG() {
local comp=$1
local lang=$2
shift 2
[[ -z ${comp} || -z $1 ]] && return 1
local cmdline=(
$(tc-get${comp})
# Clang will warn about unknown gcc flags but exit 0.
# Need -Werror to force it to exit non-zero.
-Werror
# Use -c so we can test the assembler as well.
-c -o /dev/null
)
if "${cmdline[@]}" -x${lang} - </dev/null &>/dev/null ; then
cmdline+=( "$@" -x${lang} - )
else
# XXX: what's the purpose of this? does it even work with
# any compiler?
cmdline+=( "$@" -c -o /dev/null /dev/null )
fi
if ! "${cmdline[@]}" </dev/null &>/dev/null; then
# -Werror makes clang bail out on unused arguments as well;
# try to add -Qunused-arguments to work-around that
# other compilers don't support it but then, it's failure like
# any other
cmdline+=( -Qunused-arguments )
"${cmdline[@]}" </dev/null &>/dev/null
fi
}
# @FUNCTION: test-flag-CC
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
test-flag-CC() { test-flag-PROG "CC" c "$@"; }
# @FUNCTION: test-flag-CXX
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
test-flag-CXX() { test-flag-PROG "CXX" c++ "$@"; }
# @FUNCTION: test-flag-F77
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
test-flag-F77() { test-flag-PROG "F77" f77 "$@"; }
# @FUNCTION: test-flag-FC
# @USAGE: <flag>
# @DESCRIPTION:
# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
test-flag-FC() { test-flag-PROG "FC" f95 "$@"; }
test-flags-PROG() {
local comp=$1
local flags=()
local x
shift
[[ -z ${comp} ]] && return 1
while (( $# )); do
case "$1" in
--param)
if test-flag-${comp} "$1" "$2"; then
flags+=( "$1" "$2" )
fi
shift 2
;;
*)
if test-flag-${comp} "$1"; then
flags+=( "$1" )
fi
shift 1
;;
esac
done
echo "${flags[*]}"
# Just bail if we dont have any flags
[[ ${#flags[@]} -gt 0 ]]
}
# @FUNCTION: test-flags-CC
# @USAGE: <flags>
# @DESCRIPTION:
# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
test-flags-CC() { test-flags-PROG "CC" "$@"; }
# @FUNCTION: test-flags-CXX
# @USAGE: <flags>
# @DESCRIPTION:
# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
# @FUNCTION: test-flags-F77
# @USAGE: <flags>
# @DESCRIPTION:
# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
test-flags-F77() { test-flags-PROG "F77" "$@"; }
# @FUNCTION: test-flags-FC
# @USAGE: <flags>
# @DESCRIPTION:
# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
test-flags-FC() { test-flags-PROG "FC" "$@"; }
# @FUNCTION: test-flags
# @USAGE: <flags>
# @DESCRIPTION:
# Short-hand that should hopefully work for both C and C++ compiler, but
# its really only present due to the append-flags() abomination.
test-flags() { test-flags-CC "$@"; }
# @FUNCTION: test_version_info
# @USAGE: <version>
# @DESCRIPTION:
# Returns shell true if the current C compiler version matches <version>, else returns shell false.
# Accepts shell globs.
test_version_info() {
if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
return 0
else
return 1
fi
}
# @FUNCTION: strip-unsupported-flags
# @DESCRIPTION:
# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
strip-unsupported-flags() {
export CFLAGS=$(test-flags-CC ${CFLAGS})
export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
export FFLAGS=$(test-flags-F77 ${FFLAGS})
export FCFLAGS=$(test-flags-FC ${FCFLAGS})
# note: this does not verify the linker flags but it is enough
# to strip invalid C flags which are much more likely, #621274
export LDFLAGS=$(test-flags-CC ${LDFLAGS})
}
# @FUNCTION: get-flag
# @USAGE: <flag>
# @DESCRIPTION:
# Find and echo the value for a particular flag. Accepts shell globs.
get-flag() {
local f var findflag="$1"
# this code looks a little flaky but seems to work for
# everything we want ...
# for example, if CFLAGS="-march=i686":
# `get-flag -march` == "-march=i686"
# `get-flag march` == "i686"
for var in $(all-flag-vars) ; do
for f in ${!var} ; do
if [ "${f/${findflag}}" != "${f}" ] ; then
printf "%s\n" "${f/-${findflag}=}"
return 0
fi
done
done
return 1
}
has_m64() {
die "${FUNCNAME}: don't use this anymore"
}
has_m32() {
die "${FUNCNAME}: don't use this anymore"
}
# @FUNCTION: replace-sparc64-flags
# @DESCRIPTION:
# Sets mcpu to v8 and uses the original value as mtune if none specified.
replace-sparc64-flags() {
local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
for x in ${SPARC64_CPUS}; do
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
done
else
for x in ${SPARC64_CPUS}; do
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
done
fi
if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
for x in ${SPARC64_CPUS}; do
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
done
else
for x in ${SPARC64_CPUS}; do
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
done
fi
export CFLAGS CXXFLAGS
}
# @FUNCTION: append-libs
# @USAGE: <libs>
# @DESCRIPTION:
# Add extra <libs> to the current LIBS. All arguments should be prefixed with
# either -l or -L. For compatibility, if arguments are not prefixed as
# options, they are given a -l prefix automatically.
append-libs() {
[[ $# -eq 0 ]] && return 0
local flag
for flag in "$@"; do
if [[ -z "${flag// }" ]]; then
eqawarn "Appending an empty argument to LIBS is invalid! Skipping."
continue
fi
case $flag in
-[lL]*)
export LIBS="${LIBS} ${flag}"
;;
-*)
eqawarn "Appending non-library to LIBS (${flag}); Other linker flags should be passed via LDFLAGS"
export LIBS="${LIBS} ${flag}"
;;
*)
export LIBS="${LIBS} -l${flag}"
esac
done
return 0
}
# @FUNCTION: raw-ldflags
# @USAGE: [flags]
# @DESCRIPTION:
# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
# to gcc where it needs the '-Wl,'.
#
# If no flags are specified, then default to ${LDFLAGS}.
raw-ldflags() {
local x input="$@"
[[ -z ${input} ]] && input=${LDFLAGS}
set --
for x in ${input} ; do
case ${x} in
-Wl,*)
x=${x#-Wl,}
set -- "$@" ${x//,/ }
;;
*) # Assume it's a compiler driver flag, so throw it away #441808
;;
esac
done
echo "$@"
}
# @FUNCTION: no-as-needed
# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
no-as-needed() {
case $($(tc-getLD) -v 2>&1 </dev/null) in
*GNU*) # GNU ld
echo "-Wl,--no-as-needed" ;;
esac
}
fi