Build: Fix paths passed as flag args w/ spaces

Add some quotes to paths passed as compiler flag arguments in CMake

Author: zbeekman

CMakeLists.txt

@@ -104,11 +104,11 @@ if(DEFINED CMAKE_BUILD_TYPE AND "${CMAKE_BUILD_TYPE}" MATCHES "[Rr][Ee][Ll]")
   if(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fno-working-directory")
   endif()
-  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdebug-prefix-map=${CMAKE_SOURCE_DIR}=.")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdebug-prefix-map=\"${CMAKE_SOURCE_DIR}\"=.")
   if(CMAKE_C_COMPILER_ID MATCHES "GNU")
     set(CMAKE_C_FLAGS       "${CMAKE_C_FLAGS} -fno-working-directory")
   endif()
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdebug-prefix-map=${CMAKE_SOURCE_DIR}=.")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdebug-prefix-map=\"${CMAKE_SOURCE_DIR}\"=.")
 endif()
 
 message( STATUS "Building OpenCoarrays version: ${full_git_describe}" )