Mesa compiler specification

[Christoph Moench-Tegeder]

## Kevin Oberman (rkoberman at gmail.com):

> I do have one question/request... Can the mesa ports be updated to allow
> compilation with either llvm60 or llvm70?

+1 for that.

> The way the port is written, using a hard version number in
> Makefile.common, there is no easy way to pick either 60 or 70. I had to do
> an edit (one character) to switch. I am not in any way a ports or Makefile
> expert, but could this be changed to use something like
> COMPILER_VERSION=70 and ALT_COMPILER_VERSION=60 or something similar to
> allow llvm60 to be used when it has been installed and llvm70 has not?

bsd.default-versions.mk has LLVM_DEFAULT - wouldn't it be best to
use that (and include mesa-related ports in regression testing when
switching to llvm80)?

Regards,
Christoph

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