Comment # 14 on bug 109048 from Henri Valta

(In reply to Timothy Arceri from comment #13)
> What version of GCC are you using to build Mesa?

It's from arch linux package 8.2.1+20181127-1

>I wonder if this is actually a compiler bug rather than a Mesa bug given your find above.

I'll open a bug for the arch mesa package and link it to this, so the people
there who know what's going on with the gcc version might be able to help.