On Thu, Jan 08, 2015 at 07:42:32PM +0100, Uros Bizjak wrote:
> > I don't know how portable scalbnl actually is in reality, so it would be
> > nice to hear from port maintainers whether say newlib, android, darwin,
> > cygwin, aix etc. have it.
>
> Newlib has it.
>
> Other than that:
>
> exp2(), exp2f(), exp2l():
> _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >=
> 200112L;
> or cc -std=c99
>
> scalbln(), scalblnf(), scalblnl():
> _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
> _POSIX_C_SOURCE >= 200112L;
> or cc -std=c99
>
> Since we are replacing exp2 with scalbln, we have the same
> requirements as before, at least we won't regress here.
The patch is ok then. If it is missing somewhere, we can always check for
it in configure and add a val *= pow (2.0, exp); fallback that should be
more portable.
Jakub
