Issue compiling simple code with clang++-mp-11

[Ryan Schmidt]

On May 3, 2021, at 07:14, Andrew Udvare wrote:

> it wasn't until recently that Xcode Clang and MacPorts Clang versions mismatched their highest numbers (Xcode 12.5 having Clang 12, MacPorts having up to 11).

Xcode clang version numbering is completely different from open source clang version numbering and has been for many years already. Xcode clang 11 is not the same thing as open source clang 11.