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

[Jakub Jelinek]

On Fri, Jan 31, 2014 at 03:49:40PM +0100, Richard Biener wrote:
> On Fri, Jan 31, 2014 at 3:45 PM, FX <fxcoudert@gmail.com> wrote:
> >> 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.)
> 
> Yeah - you know, that message is quite long and somehow I didn't read it
> carefully.  I suspect that will happen to others, too, so we'll get some
> extra complaints from that ;)
> 
> >> 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?
> 
> Well, building the stage1 compiler is probably the fastest thing nowadays
> (it didn't yet build the target libraries for stage1 with the stage1,
> unoptimized
> and checking-enabled compiler - which is where it would fail in the odd
> way which is what you want to improve).
> 
> As I said, you can't "properly" check it at the point you are checking.
> Which is why I complain - you're not checking this properly!
> 
> Anyway, I've fixed the "bug" on our side with --enable-multilib.

Just hit the same thing, while I have (in mock) 32-bit devel libc installed,
I don't have 32-bit libgcc_s installed (what for, it will be built by gcc).

Please revert it, or at least improve it (e.g. by trying to build
with -static-libgcc at least).

	Jakub