compiling newlib

[Keith Packard]

Paul Zimmermann <Paul.Zimmermann@inria.fr> writes:

> thank you Jeff for your answer.
>
> In return I found I believe an issue with newlib's tgammaf function, for
> input -0, where it gives +inf instead of -inf:

Yeah, it's easy to fix the underlying __ieee754_lgamma functions to
adjust the sign of the return:

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There's a bit of a mess with the gamma functions. There are _r
versions of these functions that pass through the sign return pointer
instead of applying it locally as they should. That reduces the set of
gamma functions as follows:

Reentrant functions:

        double                  float
        __ieee754_lgamma_r      __ieee754_lgammaf_r
        __ieee754_gamma         __ieee754_gammaf
        
        lgamma_r                lgammaf_r
        tgamma                  tgammaf

gamma/gammaf should be alternate names for tgamma/tgammaf, and would
thus be re-entrant.

Non-reentrant functions:

        __ieee754_lgamma        __ieee754_lgammaf        

        lgamma                  lgammaf

-- 
-keith
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