[PATCH] Fix -Wundef warnins for __FP_FAST_FMA*

[Siddhesh Poyarekar]

On Tue, Mar 18, 2014 at 12:38:37AM -0400, Carlos O'Donell wrote:
> I'm including Roland in this discussion, because I'd like to hear
> his input.
> 
> I feel like the correction solution to use a configure check to
> determine if the compiler defines e.g. __FP_FAST_FMA, and then
> explicitly define a compiler feature macro as 0 or 1.

bits/mathdef.h is installed, so using a configure check here would be
wrong.

Siddhesh
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