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--- a/tests/tools/autotest.sh
+++ b/tests/tools/autotest.sh
@@ -25,9 +25,11 @@ firrtl2verilog=""
xfirrtl="../xfirrtl"
abcprog="$toolsdir/../../yosys-abc"
+exec {lock}<"$toolsdir"; flock "$lock" 1>&2
if [ ! -f "$toolsdir/cmp_tbdata" -o "$toolsdir/cmp_tbdata.c" -nt "$toolsdir/cmp_tbdata" ]; then
- ( set -ex; ${CC:-gcc} -Wall -o "$toolsdir/cmp_tbdata" "$toolsdir/cmp_tbdata.c"; ) || exit 1
+ ( set -ex; ${CC:-gcc} -Wall ${CFLAGS:-} -o "$toolsdir/cmp_tbdata" "$toolsdir/cmp_tbdata.c"; ) || exit 1
fi
+flock -u "$lock"; exec {lock}>&-
while getopts xmGl:wkjvref:s:p:n:S:I:A:-: opt; do
case "$opt" in
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