Re: [libvirt] Syntax check rules broken if 'exclude' is not defined

I noticed that many (most) of the libvirt syntax-check rules were not generating any results, despite me introducing obvious violations. >From my debugging the problem appears to be caused by this commit: commit 727075d03c670affa68f71313979781f5ba9bbfc Author: Eric Blake <eblake(a)redhat.com&gt; Date: Thu Mar 1 14:51:31 2012 -0700 maint.mk: add per-line exclusions to prohibitions If I revert the following hunk from maint.mk @@ -258,6 +268,7 @@ define _sc_search_regexp if test -n "$$files"; then \ if test -n "$$prohibit"; then \ grep $$with_grep_options $(_ignore_case) -nE "$$prohibit" $$files \ + | grep -vE "$${exclude-^$$}" \ && { msg="$$halt" $(_sc_say_and_exit) } || :; \ else \ grep $$with_grep_options $(_ignore_case) -LE "$$require" $$files \ then the syntax-check rules work again. It seems that this grep is broken, if a test leaves $exclude undefined, causing it to filter out all results.