CMake additional options format string

I use the MSVC 2015 generator with CMake. I need to pass the "--config Release" parameter.

If I write

config Release

I get

cmake.exe --build . --target ALL_BUILD -- config Release

(unnecessary space between "--" and "config").

If I write

--config Release

I get

cmake.exe --build . --target ALL_BUILD -- --config Release

(unnecessary string "-- " with a space at the end).