Fix CMP0054 cmake 3.1.0 warnings

Change-Id: I5d91289a543240fa6f493b7f7738522f3c268c07

diff --git a/cmake/gmxOptionUtilities.cmake b/cmake/gmxOptionUtilities.cmake
index 7da67d4403e7a0284ecf4b837baa8ec8d27f8777..a6f045b857183b929c082b67cea10a4eeeb23b4e 100644 (file)
--- a/cmake/gmxOptionUtilities.cmake
+++ b/cmake/gmxOptionUtilities.cmake
@@ -166,7 +166,7 @@ endmacro()
 function(GMX_CHECK_IF_CHANGED RESULT)
     set(_result FALSE)
     foreach (_var ${ARGN})
-        if (NOT "${_var}" STREQUAL "${_var}_PREVIOUS_VALUE")
+        if (NOT "${${_var}}" STREQUAL "${${_var}_PREVIOUS_VALUE}")
             set(_result TRUE)
         endif()
         set(${_var}_PREVIOUS_VALUE "${${_var}}" CACHE INTERNAL