CMake: Bugfix: Clear compile variables prior to populating

git-svn-id: https://svn.dealii.org/trunk@32290 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/cmake/setup_cached_variables.cmake b/deal.II/cmake/setup_cached_variables.cmake
index c4fc91f1dd986fc0254585b78cf23a998c638747..913aba891c586602e835915950413bc261e1858a 100644 (file)
--- a/deal.II/cmake/setup_cached_variables.cmake
+++ b/deal.II/cmake/setup_cached_variables.cmake
@@ -282,7 +282,7 @@ FOREACH(_flag ${DEAL_II_USED_FLAGS})
   # file).
   #
   SET(${_flag}_SAVED ${${_flag}})
-  SET(${_flag})
+  SET(${_flag} "")
 ENDFOREACH()
 
 FOREACH(_variable