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Make build_wrapper.sh a bit more robust and support LLVM toolchain #455

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Make build_wrapper.sh a bit more robust and support LLVM toolchain #455

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12 changes: 9 additions & 3 deletions cmake/build_wrapper.sh
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Original file line number Diff line number Diff line change
@@ -1,10 +1,16 @@
#!/bin/sh -e
# This is used for renaming symbols for the fat runtime, don't call directly
# TODO: make this a lot less fragile!

set -e

cleanup () {
rm -f ${SYMSFILE} ${KEEPSYMS}
}

: ${NM:=nm}
: ${OBJCOPY:=objcopy}

PREFIX=$1
KEEPSYMS_IN=$2
shift 2
Expand All @@ -17,12 +23,12 @@ KEEPSYMS=$(mktemp -p /tmp keep.syms.XXXXX)
LIBC_SO=$("$@" --print-file-name=libc.so.6)
cp ${KEEPSYMS_IN} ${KEEPSYMS}
# get all symbols from libc and turn them into patterns
nm -f p -g -D ${LIBC_SO} | sed -s 's/\([^ @]*\).*/^\1$/' >> ${KEEPSYMS}
${NM} -f posix -g -D ${LIBC_SO} | sed -s 's/\([^ @]*\).*/^\1$/' >> ${KEEPSYMS}
# build the object
"$@"
# rename the symbols in the object
nm -f p -g ${OUT} | cut -f1 -d' ' | grep -v -f ${KEEPSYMS} | sed -e "s/\(.*\)/\1\ ${PREFIX}_\1/" >> ${SYMSFILE}
${NM} -f posix -g ${OUT} | cut -f1 -d' ' | grep -v -f ${KEEPSYMS} | sed -e "s/\(.*\)/\1\ ${PREFIX}_\1/" >> ${SYMSFILE}
if test -s ${SYMSFILE}
then
objcopy --redefine-syms=${SYMSFILE} ${OUT}
${OBJCOPY} --redefine-syms=${SYMSFILE} ${OUT}
fi