From 4ffec8f666b996aedd592e6d26286cef2cb38b50 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 18 Aug 2014 10:49:30 -0400
Subject: Check*: Add compatibility hack for old VXL code

The cleanup in commit 4f2fcce4 (Check*: Allow result variables to
contain regex special characters, 2014-07-31) broke old VXL code that
abuses the old "if(MATCHES)" implementation by using

  SET( ${VARIABLE} ${VARIABLE} )

to reset a check result variable.  Add a compatibility hack to the
CheckFunctionExists, CheckIncludeFileCXX, and CheckSymbolExists modules
to re-run their checks when the result variable is set to its own name.
Use STREQUAL instead of MATCHES so that special characters still work.
---
 Modules/CheckIncludeFileCXX.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Modules/CheckIncludeFileCXX.cmake')

diff --git a/Modules/CheckIncludeFileCXX.cmake b/Modules/CheckIncludeFileCXX.cmake
index 718e667f45..eff982cc10 100644
--- a/Modules/CheckIncludeFileCXX.cmake
+++ b/Modules/CheckIncludeFileCXX.cmake
@@ -44,7 +44,7 @@
 #  License text for the above reference.)
 
 macro(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
-  if(NOT DEFINED "${VARIABLE}")
+  if(NOT DEFINED "${VARIABLE}" OR "x${${VARIABLE}}" STREQUAL "x${VARIABLE}")
     if(CMAKE_REQUIRED_INCLUDES)
       set(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
     else()
-- 
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