all those pesky math functions

[Phil Edwards]

Gabriel Dos Reis <Gabriel.Dos-Reis@cmla.ens-cachan.fr>:
> Phil Edwards <pedwards@disaster.jaj.com> writes:
>
> | Checking for those functions consumes much of the time spent in
> | 'configure'.  Are those checks the kind that can be safely cached?
>
> At first sight, I'd say caching them should be OK, but hey I've been
> so repeatedly surprised by those beasts that I can't say with
> confidence that caching is safe.  Let's go that way.  If it breaks
> then we'll something :-). 

Yeah, that actually bit me once, too.  I'll go ahead and cache them, and
add a note to the build docs that, when rebuilding, certain lines in the
cache may need to be stripped with sed.  Or the cache deleted altogether.

Phil