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dnl GNU_MAKE_JOBSERVER
dnl
dnl Implement a workaround for GNU mak jobserver by adding the '+' to the
dnl recipe line in Makefiles generated by automake.
dnl
AC_DEFUN([GNU_MAKE_JOBSERVER],[dnl
m4_pattern_allow(AM_V_CCLD)
touch config.status.tmp
dnl Must keep the same timestamps on config.status and Makefile.
if touch --reference=config.status config.status.tmp > /dev/null 2>&1; then
sed '/as_fn_exit 0/i \
sed -e \"s/^\t\\\(\\\$(AM_V_CCLD)\\\)/\t+ \\\1/\" Makefile > Makefile.tmp \
touch --reference=Makefile Makefile.tmp \
mv Makefile.tmp Makefile \
' config.status > config.status.tmp
touch --reference=config.status config.status.tmp
mv config.status.tmp config.status
chmod +x config.status
sed -e "s/^\t\(\$(AM_V_CCLD)\)/\t+ \1/" Makefile > Makefile.tmp
touch --reference=Makefile Makefile.tmp
mv Makefile.tmp Makefile
else
rm -f config.status.tmp
fi])
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