some flags '-pthread' had trailing whitespaces. Was not accepted by my cmake

AMDiS/cmake3/target_enable_petsc.cmake

@@ -10,9 +10,9 @@ macro(target_enable_mpi _TARGET_ _SCOPE_)
     find_package(MPI REQUIRED)
     target_include_directories(${_TARGET_} ${_SCOPE_}
       ${MPI_CXX_INCLUDE_PATH})
+    string(STRIP "${MPI_CXX_COMPILE_FLAGS}" MPI_CXX_COMPILE_FLAGS)
     target_compile_options(${_TARGET_} ${_SCOPE_}
       ${MPI_CXX_COMPILE_FLAGS})
-
     if (LINK_EXECUTABLE)
       # the parameter --enable-new-dtags causes a linker problem, i.e. some libraries are
       # linked without an rpath (or any other path information) and can not be found while
@@ -23,7 +23,7 @@ macro(target_enable_mpi _TARGET_ _SCOPE_)
       target_link_libraries(${_TARGET_} ${_SCOPE_} ${MPI_CXX_LIBRARIES} ${MY_MPI_CXX_LINK_FLAGS})
     endif (LINK_EXECUTABLE)
 endmacro(target_enable_mpi)
-
+	
 macro(target_enable_petsc _TARGET_ _SCOPE_)
     if (${ARGC} GREATER 2)
       set(LINK_EXECUTABLE ON)