When building OpenJDK8u on MacOS using Clang, we see this error:

clang: error: invalid version number in '-mmacosx-version-min=11.00.00'

I believe this was caused by this commit:

https://github.com/openjdk/jdk8u/commit/5c0b36a630a4280d3ea4a6494e9bcf76c57191a6

My first idea is to change MACOSX_VERSION_MIN to 11.0.0

I'm running a build now to see if that change would resolve this.

Update: Same problem. Trying 11.0

Update: This problem appears to have been caused by using an earlier version of the xcode SDK that is prior to 11.

This seems counter-intuitive, as the error message seems to imply that the problem is either:
- The version string has an invalid format.
or
- The MacOS version is too old.

Solutions to this problem include using a later version of the Xcode SDK for builds.

Resolving this bug. Good to have this issue documented anyway, in case anyone else has this issue.