Recognize "REGRESS_OPTS += ..." syntax in MSVC build scripts.

Necessitated by commit b14cf229f4bd7238be2e31d873dc5dd241d3871e.
Per buildfarm.

diff --git a/src/tools/msvc/vcregress.pl b/src/tools/msvc/vcregress.pl
index d73775c743018f224359c48881819a1f9a95f620..bfa8a3dc909935dfa2a8f56b284873b8e7793a87 100644 (file)
--- a/src/tools/msvc/vcregress.pl
+++ b/src/tools/msvc/vcregress.pl
@@ -410,7 +410,7 @@ sub fetchRegressOpts
        my @opts;
 
        $m =~ s{\\\r?\n}{}g;
-       if ($m =~ /^\s*REGRESS_OPTS\s*=(.*)/m)
+       if ($m =~ /^\s*REGRESS_OPTS\s*\+?=(.*)/m)
        {
                # Substitute known Makefile variables, then ignore options that retain
                # an unhandled variable reference.  Ignore anything that isn't an