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

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#!/usr/bin/bash -eu
if [ -z "$RPM_BUILD_ROOT" ] || [ "$RPM_BUILD_ROOT" = "/" ]; then
exit 0
fi
CLANG_FLAGS=$@
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NCPUS=${RPM_BUILD_NCPUS:-1}
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check_convert_bitcode () {
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local file_name=$(realpath ${1})
local file_type=$(file ${file_name})
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shift
CLANG_FLAGS="$@"
if [[ "${file_type}" == *"LLVM IR bitcode"* ]]; then
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# 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
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if [ $? -eq 0 ]; then
echo "Compiling LLVM bitcode file ${file_name}."
clang ${CLANG_FLAGS} -fno-lto -Wno-unused-command-line-argument \
-x ir ${file_name} -c -o ${file_name}
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fi
elif [[ "${file_type}" == *"current ar archive"* ]]; then
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echo "Unpacking ar archive ${file_name} to check for LLVM bitcode components."
# create archive stage for objects
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local archive_stage=$(mktemp -d)
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local archive=${file_name}
pushd ${archive_stage}
ar x ${archive}
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for archived_file in $(find -not -type d); do
check_convert_bitcode ${archived_file} ${CLANG_FLAGS}
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echo "Repacking ${archived_file} into ${archive}."
ar r ${archive} ${archived_file}
done
popd
fi
}
echo "Checking for LLVM bitcode artifacts"
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export -f check_convert_bitcode
find "$RPM_BUILD_ROOT" -type f -name "*.[ao]" -print0 | \
xargs -0 -r -n1 -P$NCPUS sh -c "check_convert_bitcode \$@ $CLANG_FLAGS" ARG0