From e6c956d1131eedf3f0f7365f718ddedb289fa1a9 Mon Sep 17 00:00:00 2001
From: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>
Date: Fri, 23 Jan 2015 05:27:11 -0500
Subject: [PATCH] Simplify if() conditions on check result variables to fix
 CMP0054 warning

Remove use of an old hack that takes advantage of the auto-dereference
behavior of the if() command to detect if a variable is defined.  The
hack has the form:

 if("${VAR} MATCHES "^${VAR}$")

where "${VAR}" is a macro argument reference.  Use if(NOT DEFINED) instead.
This also avoids warnings for CMake Policy CMP0054.
---
 CMake/OpenIGTLinkCMakeTests.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMake/OpenIGTLinkCMakeTests.cmake b/CMake/OpenIGTLinkCMakeTests.cmake
index 54447444..a42159ea 100644
--- a/CMake/OpenIGTLinkCMakeTests.cmake
+++ b/CMake/OpenIGTLinkCMakeTests.cmake
@@ -5,7 +5,7 @@ INCLUDE(CheckFunctionExists)
 
 CHECK_LIBRARY_EXISTS("socket" getsockname "" OpenIGTLink_HAVE_LIBSOCKET)
 
-IF("OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T" MATCHES "^OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T$")
+IF(NOT DEFINED "OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T")
   IF(OpenIGTLink_HAVE_LIBSOCKET)
     SET(OpenIGTLink_GETSOCKNAME_LIBS "socket")
   ELSE(OpenIGTLink_HAVE_LIBSOCKET)
@@ -32,7 +32,7 @@ IF("OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T" MATCHES "^OpenIGTLink_HAVE_GETS
       "failed with the following output:\n"
       "${OUTPUT}\n" APPEND)
   ENDIF(OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T)
-ENDIF("OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T" MATCHES "^OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T$")
+ENDIF(NOT DEFINED "OpenIGTLink_HAVE_GETSOCKNAME_WITH_SOCKLEN_T")
 
 
 # e.g. Mac OS X Snow Leopard does not have strnlen().