libm lacks C99 functions -> no c++11 cmath in libstdc++

[Dmitry Marakasov]

* Steve Kargl (sgk at troutmask.apl.washington.edu) wrote:

> > - bad enough by itself, it affects libstdc++ from ports' gcc in such a
> >   way that it disables C++11 math completely (along with a lot more
> >   other more widely used math functions)
> >
> >
> > - we may probably implement these by calling less-precise
> >   erf erfc lgamma tgamma as we do with other functions as we alredy
> >   do with some others
> 
> This, unfortuantely, has already been done, although it may only 
> be available in FreeBSD-current.  See src/lib/msun/src/imprecise.c.

I know, it's available on 10.0 as well. However that's not the case for
9.x, for which it's impossible to build c++11 math using software (even
if it doesn't use unimplemented functions), neither with system gcc
nor with gcc from ports.

-- 
Dmitry Marakasov   .   55B5 0596 FF1E 8D84 5F56  9510 D35A 80DD F9D2 F77D
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