From 3b5ea54a27bc69cf64c87dd5dc2bdc227dc4e776 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 16 Sep 2014 09:04:20 -0400
Subject: CheckPrototypeDefinition: Avoid if() auto-dereference

Convert from the old if(MATCHES) hack to if(DEFINED) to check whether
the result variable is already set.
---
 Modules/CheckPrototypeDefinition.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/CheckPrototypeDefinition.cmake b/Modules/CheckPrototypeDefinition.cmake
index dfa54d8..e203d4c 100644
--- a/Modules/CheckPrototypeDefinition.cmake
+++ b/Modules/CheckPrototypeDefinition.cmake
@@ -57,7 +57,7 @@ get_filename_component(__check_proto_def_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
 
 function(CHECK_PROTOTYPE_DEFINITION _FUNCTION _PROTOTYPE _RETURN _HEADER _VARIABLE)
 
-  if ("${_VARIABLE}" MATCHES "^${_VARIABLE}$")
+  if (NOT DEFINED ${_VARIABLE})
     set(CHECK_PROTOTYPE_DEFINITION_CONTENT "/* */\n")
 
     set(CHECK_PROTOTYPE_DEFINITION_FLAGS ${CMAKE_REQUIRED_FLAGS})
-- 
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