[RFC, patch] Detect lack of 32-bit devel environment on x86_64-linux targets

[FX]

> I've just seen that an explicit --enable-multilib is a way to do that.

Yes, I was writing that as a reply when I received your email. (Also, it’s written in the configure error message.)


> Btw, doing the configure check exactly after all-stage1-gcc should be
> an early enough and a serialization point, no?  There you can do the
> check even for when cross-compiling.

Well, you’ve already built a whole stage, so it’s not so early, is it?


FX