Merge branch 'thoennes/cmake-fixes' into 'master'

Minor cmake fixes

See merge request walberla/walberla!452

CMakeLists.txt

@@ -478,7 +478,7 @@ try_compile( WALBERLA_USE_STD_FILESYSTEM "${CMAKE_CURRENT_BINARY_DIR}" "${CMAKE_
              COMPILE_DEFINITIONS -DWALBERLA_USE_STD_FILESYSTEM COPY_FILE "${CMAKE_CURRENT_BINARY_DIR}/TestStdFilesystem" )
 if( WALBERLA_USE_STD_FILESYSTEM )
   # detect https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90050 by checking whether it segfaults
-  execute_process( COMMAND "${CMAKE_CURRENT_BINARY_DIR}/TestStdFilesystem" RESULT_VARIABLE WALBERLA_STD_FILESYSTEM_WORKS )
+  execute_process( COMMAND "${CMAKE_CURRENT_BINARY_DIR}/TestStdFilesystem" OUTPUT_QUIET RESULT_VARIABLE WALBERLA_STD_FILESYSTEM_WORKS )
 endif()
 if( WALBERLA_USE_STD_FILESYSTEM AND WALBERLA_STD_FILESYSTEM_WORKS EQUAL 0 )
    message( STATUS "Found std::filesystem")

cmake/FindOpenMesh.cmake

@@ -53,7 +53,7 @@
 #                                                                            
 #===========================================================================
 
-cmake_minimum_required(VERSION 2.8.9)
+cmake_minimum_required(VERSION 2.8.12)
 
 #if already found via finder or simulated finder in openmesh CMakeLists.txt, skip the search
 IF (NOT OPENMESH_FOUND)