errchk: fix build - allow matches in multiline error messages
TBR=r
CC=golang-dev
https://golang.org/cl/1734042
diff --git a/test/errchk b/test/errchk
index 3aafddb..115aa7b 100755
--- a/test/errchk
+++ b/test/errchk
@@ -31,7 +31,12 @@
# Run command
$cmd = join(' ', @ARGV);
open(CMD, "exec $cmd </dev/null 2>&1 |") || die "BUG: errchk: run $cmd: $!";
-@out = grep { !/^ / } <CMD>;
+
+# 6g error messages continue onto additional lines with leading tabs.
+# Split the output at the beginning of each line that doesn't begin with a tab.
+$out = join('', <CMD>);
+@out = split(/^(?!\t)/m, $out);
+
close CMD;
if($? == 0) {
