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turn on objcopy by default for all targets #141

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nickdesaulniers merged 2 commits into from
May 13, 2019
Merged

turn on objcopy by default for all targets #141

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e9f08e5
turn on objcopy by default for all targets
nickdesaulniers Mar 27, 2019
4b9394a
call correct version check function
nickdesaulniers Mar 27, 2019
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35 changes: 32 additions & 3 deletions driver.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ set -eu
setup_variables() {
while [[ ${#} -ge 1 ]]; do
case ${1} in
"AR="*|"ARCH="*|"CC="*|"LD="*|"REPO="*) export "${1?}" ;;
"AR="*|"ARCH="*|"CC="*|"LD="*|"OBJCOPY"=*|"REPO="*) export "${1?}" ;;
"-c"|"--clean") cleanup=true ;;
"-j"|"--jobs") shift; jobs=$1 ;;
"-j"*) jobs=${1/-j} ;;
Expand Down Expand Up @@ -145,7 +145,7 @@ check_dependencies() {
command -v ${readelf} &>/dev/null && break
done

# Check for LD, CC, and AR environmental variables
# Check for LD, CC, OBJCOPY, and AR environmental variables
# and print the version string of each. If CC and AR
# don't exist, try to find them.
# lld isn't ready for all architectures so it's just
Expand Down Expand Up @@ -183,6 +183,14 @@ check_dependencies() {
fi
check_ar_version
${AR} --version

if [[ -z "${OBJCOPY:-}" ]]; then
for OBJCOPY in llvm-objcopy-9 llvm-objcopy-8 llvm-objcopy-7 llvm-objcopy "${CROSS_COMPILE:-}"objcopy; do
command -v ${OBJCOPY} 2>/dev/null && break
done
fi
check_objcopy_version
${OBJCOPY} --version
}

# Optimistically check to see that the user has a llvm-ar
Expand All @@ -206,13 +214,34 @@ check_ar_version() {
fi
}

# Optimistically check to see that the user has a llvm-objcopy
# with https://reviews.llvm.org/rL357017. If they don't,
# fall back to GNU objcopy and let them know.
check_objcopy_version() {
if ${OBJCOPY} --version | grep -q "LLVM" && \
[[ $(${OBJCOPY} --version | grep version | sed -e 's/.*LLVM version //g' -e 's/[[:blank:]]*$//' -e 's/\.//g' -e 's/svn//' ) -lt 900 ]]; then
set +x
echo
echo "${OBJCOPY} found but appears to be too old to build the kernel (needs to be at least 9.0.0)."
echo
echo "Please either update llvm-objcopy from your distro or build it from source!"
echo
echo "See https://github.com/ClangBuiltLinux/linux/issues/418 for more info."
echo
echo "Falling back to GNU objcopy..."
echo
OBJCOPY=${CROSS_COMPILE:-}objcopy
set -x
fi
}

mako_reactor() {
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/kbuild/kbuild.txt
time \
KBUILD_BUILD_TIMESTAMP="Thu Jan 1 00:00:00 UTC 1970" \
KBUILD_BUILD_USER=driver \
KBUILD_BUILD_HOST=clangbuiltlinux \
make -j"${jobs:-$(nproc)}" CC="${CC}" HOSTCC="${CC}" LD="${LD}" HOSTLD="${HOSTLD:-ld}" AR="${AR}" "${@}"
make -j"${jobs:-$(nproc)}" CC="${CC}" HOSTCC="${CC}" LD="${LD}" HOSTLD="${HOSTLD:-ld}" AR="${AR}" OBJCOPY="${OBJCOPY}" "${@}"
}

apply_patches() {
Expand Down
4 changes: 4 additions & 0 deletions usage.txt
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Expand Up @@ -21,6 +21,10 @@ Environment variables:
clang-9, clang-8, clang-7, then clang if they are found in PATH.
LD:
If no LD value is specified, ${CROSS_COMPILE}ld is used. arm64 only.
OBJCOPY:
If no OBJCOPY value is specified, the script will attempt to set OBJCOPY
to llvm-objcopy-9, llvm-objcopy-8, llvm-objcopy-7, llvm-objcopy, then
${CROSS_COMPILE}objcopy if they are found in PATH.
REPO:
Nicknames for trees:
linux (default)
Expand Down