From 7e824e83a9c97234f23640188c590201eeffea5d Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 13 Dec 2002 14:58:55 -0500
Subject: ENH: Don't repeat check even if answer was no.

---
 Modules/CheckVariableExists.cmake | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

(limited to 'Modules/CheckVariableExists.cmake')

diff --git a/Modules/CheckVariableExists.cmake b/Modules/CheckVariableExists.cmake
index daa87a0856..9eaf73b826 100644
--- a/Modules/CheckVariableExists.cmake
+++ b/Modules/CheckVariableExists.cmake
@@ -6,18 +6,20 @@
 #
 
 MACRO(CHECK_VARIABLE_EXISTS VAR VARIABLE)
-  SET(MACRO_CHECK_VARIABLE_DEFINITIONS -DCHECK_VARIABLE_EXISTS=${VAR})
-  TRY_COMPILE(${VARIABLE}
-             ${PROJECT_BINARY_DIR}
-             ${CMAKE_ROOT}/Modules/CheckVariableExists.c
-             CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
-             OUTPUT_VARIABLE OUTPUT)
-  IF(${VARIABLE})
-    SET(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}")
-  ELSE(${VARIABLE})
-    SET(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}")
-    WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
-      "Determining if the variable ${VAR} exists failed with the following output:\n"
-      "${OUTPUT}\n" APPEND)
-  ENDIF(${VARIABLE})
+  IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+    SET(MACRO_CHECK_VARIABLE_DEFINITIONS -DCHECK_VARIABLE_EXISTS=${VAR})
+    TRY_COMPILE(${VARIABLE}
+               ${PROJECT_BINARY_DIR}
+               ${CMAKE_ROOT}/Modules/CheckVariableExists.c
+               CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
+               OUTPUT_VARIABLE OUTPUT)
+    IF(${VARIABLE})
+      SET(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}")
+    ELSE(${VARIABLE})
+      SET(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}")
+      WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
+        "Determining if the variable ${VAR} exists failed with the following output:\n"
+        "${OUTPUT}\n" APPEND)
+    ENDIF(${VARIABLE})
+  ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
 ENDMACRO(CHECK_VARIABLE_EXISTS)
-- 
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