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aclocal.m4
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# touch conftest.ts1; touch conftest.ts2; make
# should touch ts1 because ts2 is newer. This could happen by luck,
# but most often, it will fail if make's support is insufficient. So
# test for several consecutive successes.
#
# (We reuse conftest.ts[12] because we still want to modify existing
# files, not create new ones, per above.)
n=0
make=${MAKE-make}
until test $n -eq 3; do
echo one > conftest.ts1
sleep $am_try_res
echo two > conftest.ts2 # ts2 should now be newer than ts1
if $make -f conftest.mk | grep 'up to date' >/dev/null; then
make_ok=false
break # out of $n loop
fi
n=`expr $n + 1`
done
fi
#
if $make_ok; then
# Everything we know to check worked out, so call this resolution good.
am_cv_filesystem_timestamp_resolution=$am_try_res
break # out of $am_try_res loop
fi
# Otherwise, we'll go on to check the next resolution.
fi
done
rm -f conftest.ts?
# (end _am_filesystem_timestamp_resolution)
])])