CMake: Concatenate subsequent compiler flag strings with a space

Otherwise compilation of a target that already has compile flags and is
set up with DEAL_II_SETUP_TARGET will fail.

diff --git a/cmake/macros/macro_deal_ii_setup_target.cmake b/cmake/macros/macro_deal_ii_setup_target.cmake
index 5db5f4a563960b88f207804032df1e26ed8f8f91..c3e5181762337d1fbd6366baaf2ad0f42485ea93 100644 (file)
--- a/cmake/macros/macro_deal_ii_setup_target.cmake
+++ b/cmake/macros/macro_deal_ii_setup_target.cmake
@@ -108,7 +108,7 @@ MACRO(DEAL_II_SETUP_TARGET _target)
     INCLUDE_DIRECTORIES "${DEAL_II_INCLUDE_DIRS}"
     )
   SET_PROPERTY(TARGET ${_target} APPEND_STRING PROPERTY
-    COMPILE_FLAGS "${DEAL_II_CXX_FLAGS} ${DEAL_II_CXX_FLAGS_${_build}}"
+    COMPILE_FLAGS " ${DEAL_II_CXX_FLAGS} ${DEAL_II_CXX_FLAGS_${_build}}"
     )
   SET_PROPERTY(TARGET ${_target} APPEND_STRING PROPERTY
     LINK_FLAGS " ${DEAL_II_LINKER_FLAGS} ${DEAL_II_LINKER_FLAGS_${_build}}"