redhat-rpm-config/brp-llvm-compile-lto-elf

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2021-02-10 16:59:25 +00:00
#!/usr/bin/bash -eu
CLANG_FLAGS=$@
if [ -z "$RPM_BUILD_ROOT" ] || [ "$RPM_BUILD_ROOT" = "/" ]; then
exit 0
fi
TMPDIR=`mktemp -d`
check_convert_bitcode () {
local file_name=`realpath ${1}`
local file_type=`file ${file_name}`
if [[ "${file_type}" == *"LLVM IR bitcode"* ]]; then
# check for an indication that the bitcode was
# compiled with -flto
llvm-bcanalyzer -dump ${file_name} | grep -xP '.*\-flto((?!-fno-lto).)*' 2>&1 > /dev/null
2021-02-10 16:59:25 +00:00
if [ $? -eq 0 ]; then
echo "Compiling LLVM bitcode file ${file_name}."
# create path to file in temp dir
# move file to temp dir with llvm .bc extension for clang
mkdir -p ${TMPDIR}/`dirname ${file_name}`
mv $file_name ${TMPDIR}/${file_name}.bc
clang -c ${CLANG_FLAGS} -fno-lto -Wno-unused-command-line-argument ${TMPDIR}/${file_name}.bc -o ${file_name}
fi
elif [[ "${file_type}" == *"current ar archive"* ]]; then
echo "Unpacking ar archive ${file_name} to check for LLVM bitcode components."
# create archive stage for objects
local archive_stage=`mktemp -d`
local archive=${file_name}
pushd ${archive_stage}
ar x ${archive}
for archived_file in `find -not -type d`; do
check_convert_bitcode ${archived_file}
echo "Repacking ${archived_file} into ${archive}."
ar r ${archive} ${archived_file}
done
popd
fi
}
echo "Checking for LLVM bitcode artifacts"
for i in `find $RPM_BUILD_ROOT -type f -name "*.[ao]"`; do
check_convert_bitcode ${i}
done