[Mesa-dev] broken tinderbox - AC_CHECK_FUNC nested in AC_CHECK_DECLS for signbit

[Matt Turner]

On Tue, Oct 2, 2012 at 8:02 PM, Dave Airlie <airlied at gmail.com> wrote:
> Hi guys,
>
> Tinderbox is red due to mesa failing to build, investigating seems to
> be the signbit change.
>
> The nesting of the AC_CHECK_FUNC inside the AC_CHECK_DECLS seems to
> defeat autoconf 2.63 that we ship in RHEL6.
>
> removing the nesting lets it configure here, but hopefully someone has
> a nicer idea.
>
> Dave.

Brian added a signbit macro in the case that it doesn't exist, and
then removed the check:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=24a8e0c3da65019073f89cb7248916a692707db6

So, problem solved.

I don't know why the nesting wouldn't work though. I'm curious if
putting brackets around AC_CHECK_FUNC(...) solves it?