# Sets the __FILE__ macro value to be relative to CMAKE_SOURCE_DIR.
function(set_relative_file_macro TARGET)
  if(NOT CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
    if((CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 12)
        OR (CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8))
      target_compile_options(${TARGET} PUBLIC "-fmacro-prefix-map=${CMAKE_SOURCE_DIR}/=")
    else()
      get_target_property(_srcs ${TARGET} SOURCES)
      foreach(_src ${_srcs})
        set_source_files_properties(${_src} PROPERTIES COMPILE_DEFINITIONS __FILE__="${_src}")
      endforeach()
      target_compile_options(${TARGET} PRIVATE -Wno-builtin-macro-redefined)
    endif()
  endif()
endfunction()