How to defend "using the right compiler" in upstream projects

[Jan Stary]

On Feb 10 15:40:29, mojca at macports.org wrote:
> I need help explaining why it's important to us to use the right
> compiler (even when the source is written in plain C and even Tiger
> can build the source, so one cannot say that something is really
> broken):

> https://github.com/FluidSynth/fluidsynth/issues/509
> https://github.com/macports/macports-ports/pull/3583

Shouldn't https://trac.macports.org/wiki/UsingTheRightCompiler
be precisely the place that explains this, convincigly? Does it?