Dear all, please take a look at this fix. This should prevent configure from using a grep which is not able to handle pattern lists with empty patterns.
Bug: https://bugs.openjdk.java.net/browse/JDK-8172712 webrevs: http://cr.openjdk.java.net/~stuefe/webrevs/8172712-configure-should-check-that-grep-handles-empty-pattern-correctly/webrev.00/webrev/ Background: https://bugs.openjdk.java.net/browse/JDK-8172579 was a build error caused by a buggy grep (on AIX) and the easiest way to work around that bug would be to use the GNU version of grep. It was suggested in the orginal mail thread ( http://mail.openjdk.java.net/pipermail/build-dev/2017-January/018495.html) to check this in configure. This change implements this suggestion and checks if grep behaves correctly. Kind Regards, Thomas
