[CMake] How to support separate debug and release build directories?

[David Aldrich]

>
> > I would also like this to work if I use the make targets e.g. make
> > debug.
>
> I think that's outside the scope of the Makefile generator.  For that
> generator, CMAKE_BUILD_TYPE is a configuration-wide setting.  If you
> want a different configuration, you need a different build directory
> (where "build directory" is wherever you run cmake).
>

If I don't use make targets (so that user can type 'make debug' etc) the
build command would be more cumbersome:

cmake3 --build -D CMAKE_BUILD_TYPE=Debug .

What would best practice be to provide convenient commands for our
developers to easily build the target ?
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