Improve detection of ld_date.

	PR other/93965
	* configure.ac: Improve detection of ld_date by requiring
	either two dashes or none.
	* configure: Regenerate.

gcc/ChangeLog

+2020-02-28  Martin Liska  <mliska@suse.cz>
+
+	PR other/93965
+	* configure.ac: Improve detection of ld_date by requiring
+	either two dashes or none.
+	* configure: Regenerate.
+
 2020-02-28  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/93564

gcc/configure

@@ -23384,7 +23384,7 @@ if test $in_tree_ld != yes ; then
       ld_vers=`echo $ld_ver | sed -n \
 	  -e 's,^.*[	 ]\([0-9][0-9]*\.[0-9][0-9]*.*\)$,\1,p'`
     fi
-    ld_date=`echo $ld_ver | sed -n 's,^.*\([2-9][0-9][0-9][0-9]\)[-]*\([01][0-9]\)[-]*\([0-3][0-9]\).*$,\1\2\3,p'`
+    ld_date=`echo $ld_ver | sed -n 's,^.*\([2-9][0-9][0-9][0-9]\)\(-*\)\([01][0-9]\)\2\([0-3][0-9]\).*$,\1\3\4,p'`
     ld_vers_major=`expr "$ld_vers" : '\([0-9]*\)'`
     ld_vers_minor=`expr "$ld_vers" : '[0-9]*\.\([0-9]*\)'`
     ld_vers_patch=`expr "$ld_vers" : '[0-9]*\.[0-9]*\.\([0-9]*\)'`

gcc/configure.ac

@@ -2804,7 +2804,7 @@ if test $in_tree_ld != yes ; then
       ld_vers=`echo $ld_ver | sed -n \
 	  -e 's,^.*[	 ]\([0-9][0-9]*\.[0-9][0-9]*.*\)$,\1,p'`
     fi
-    ld_date=`echo $ld_ver | sed -n 's,^.*\([2-9][0-9][0-9][0-9]\)[-]*\([01][0-9]\)[-]*\([0-3][0-9]\).*$,\1\2\3,p'`
+    ld_date=`echo $ld_ver | sed -n 's,^.*\([2-9][0-9][0-9][0-9]\)\(-*\)\([01][0-9]\)\2\([0-3][0-9]\).*$,\1\3\4,p'`
     ld_vers_major=`expr "$ld_vers" : '\([0-9]*\)'`
     ld_vers_minor=`expr "$ld_vers" : '[0-9]*\.\([0-9]*\)'`
     ld_vers_patch=`expr "$ld_vers" : '[0-9]*\.[0-9]*\.\([0-9]*\)'`