MacPorts vs. Apple compiler issues, Handle

[Joshua Root]

> MacPort installs:
> $ clang-mp-9.0 --version
> clang version 9.0.1
>
> Apple:
> $ clang --version
> Apple LLVM version 9.1.0 (clang-902.0.39.1)
>
> Is there some Apple "trick" or is it the slight compiler difference in
> version?

The version difference is less slight than you might think. Apple clang 
version numbers are unrelated to the version number of the llvm.org 
release they are based on. Apple clang 9.1.0 is closest to the clang-5.0 
port.

The name collision looks genuine however. I can only assume that 
MacTypes.h is not included or is preprocessed differently based on 
different defines in the other compiler.

- Josh