From ccfeefae356241cd05ed06f595c697379620e512 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 8 Feb 2013 16:33:52 -0500
Subject: [PATCH] Fix crash on empty CMAKE_<lang>_COMPILER value (#13901)

Since commit fd33bf93 (fix for bug 6102, allow users to change the
compiler, 2007-12-13) we keep an internal ;-list of language compiler
variable and value pairs.  Preserve empty values on expansion to ensure
that the key/value pairing remains consistent.
---
 Source/cmake.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index d57e981b6..036440ac2 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -2084,7 +2084,7 @@ struct SaveCacheEntry
 int cmake::HandleDeleteCacheVariables(const char* var)
 {
   std::vector<std::string> argsSplit;
-  cmSystemTools::ExpandListArgument(std::string(var), argsSplit);
+  cmSystemTools::ExpandListArgument(std::string(var), argsSplit, true);
   // erase the property to avoid infinite recursion
   this->SetProperty("__CMAKE_DELETE_CACHE_CHANGE_VARS_", "");
   if(this->GetIsInTryCompile())