From 663679869f8db359e6fa8611149e5cecfd86507f Mon Sep 17 00:00:00 2001
From: espie <espie@openbsd.org>
Date: Wed, 21 Jun 2017 00:11:36 +0000
Subject: [PATCH] error out if an exists condition tests an empty path, because
 that makes zero sense.

this would have caught DEPENDSFILE in gnu/cc/cc_tools

okay guenther@,  also tested by krw@
---
 usr.bin/make/cond.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/usr.bin/make/cond.c b/usr.bin/make/cond.c
index 588784284b1..41ff09a9857 100644
--- a/usr.bin/make/cond.c
+++ b/usr.bin/make/cond.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: cond.c,v 1.51 2016/10/21 16:12:38 espie Exp $	*/
+/*	$OpenBSD: cond.c,v 1.52 2017/06/21 00:11:36 espie Exp $	*/
 /*	$NetBSD: cond.c,v 1.7 1996/11/06 17:59:02 christos Exp $	*/
 
 /*
@@ -292,6 +292,9 @@ CondDoExists(struct Name *arg)
 	bool result;
 	char *path;
 
+	if (arg->s == arg->e)
+		Parse_Error(PARSE_FATAL, "Empty file name in .if exists()");
+
 	path = Dir_FindFilei(arg->s, arg->e, defaultPath);
 	if (path != NULL) {
 		result = true;
-- 
2.20.1