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

[Richard Biener]

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.

Richard.

>
> FX