[CMake] What is the default build type?

[Marcus D. Hanwell]

On Wed, Aug 2, 2017 at 1:32 PM, David Cole <DLRdave at aol.com> wrote:
>
> Very cool, Marcus. Thanks for the blog post.
>
> Florian, when you "message(${CMAKE_CONFIGURATION_TYPES})" it is empty
> because you are using a single-configuration CMake generator. Only
> Visual Studio and Xcode (and possibly other) **multi** config
> generators have a list of values in CMAKE_CONFIGURATION_TYPES.
> Contrary to the previous recommendation, I would NOT recommend setting
> it to a list in a single configuration generator. If you're using a
> multi-config generator, you can set up a subset for it to use with
> this, but in a single config generator, this variable SHOULD be empty,
> and you should not give it contents in that case.
>
Why you would not recommend setting it to a list for a single
configuration generator.