Solaris vtv port breaks x32 build

[Rainer Orth]

Sorry for replying so late: I'd been away from my mail for an extended
weekend.

Jeff Law <law@redhat.com> writes:

> On 12/01/2015 07:17 AM, Ulrich Drepper wrote:
>> On Tue, Dec 1, 2015 at 2:39 AM, Matthias Klose <doko@ubuntu.com> wrote:
>>> that might be another instance of
>>> https://gcc.gnu.org/ml/gcc-patches/2015-01/msg02064.html
>>> Does something like this help?
>>
>> No, same problem as before.  This macro doesn't actually generate any
>> code in configure.
> From looking at your configure line, I see that
> --build = x86_64-redhat-linux
> --host = x86_64-redhat-linux
>
> and no --target
>
> That to me looks like a native setup and thus I would expect
> $cross_compiling to be "no".  Hence the behaviour you're seeing.

Exactly: it would be good if Ulrich could post the canonical build,
host, and target values determined by configure, so we can be sure.

> Essentially you've got a native toolchain, but with one or more multilibs
> that can't actually be executed.

Right: I saw exactly the same behaviour in the distant past when
bootstrapping on an IRIX host that couldn't execute 64-bit binaries or
on Solaris/SPARC with a non-SPARCv9 capable cpu.  At that time, the only
workaround was to configure with --disable-multilib.

> Which in turn suggests looking more closely at Matthias's suggestion.

Exactly: moving AM_ENABLE_MULTILIB up as Matthias suggested sets
cross_compiling=maybe for non-default multilibs early, which should
achieve the desired behaviour.  All other libraries that invoke both
macros already do so in this order.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University