[CMake] Set default build type in CMakeLists.txt

[David Doria]

You may also need to use FORCE:

>
> if(NOT CMAKE_BUILD_TYPE)
>   set(CMAKE_BUILD_TYPE "Release" CACHE STRING
>       "Choose the type of build, options are: Debug Release
> RelWithDebInfo MinSizeRel."
>       FORCE)
> endif(NOT CMAKE_BUILD_TYPE)
>
> James
> _______________________________________________
>

Great, that did it (it did require using FORCE). I don't understand why
<docstring> is required? Why can you not leave that string alone and simply
change the value of <variable>?

Thanks,

David
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