Re: cmath call builtin sqrtf but many platforms seem miss that(was Re: lrint lrintf problems )

[Gunther Nikl <gni at gecko dot de>]

Bernd Roesch wrote:
> I see in my c++config.h file
>
> this stand here
>
> /* Define if the compiler/host combination has __builtin_sqrtf. */
> /* #undef _GLIBCXX_HAVE___BUILTIN_SQRTF */ 
>
> I find now a solution that work without change of cmath
>
> when i add in math.h this line then it work.the function can too stand as
> static inline in the math.h file.
>
> #define __builtin_sqrtf sqrtf

How about using the original C-library of your system together with its
headers? After all the version you are currently using is an "alien" and
doesn't fit for your system despite the fact that it was based on your
systems C-library and its headers. Carefully merging changes back to the
original version would be the better solution.

Gunther

> > On Mon, Mar 9, 2009 at 3:59 PM, Gabriel Dos Reis <dosreis@gmail.com>
> > wrote:
> > > On Mon, Mar 9, 2009 at 7:11 AM, Bernd Roesch <nospamname@web.de> wrote:
> > > > Hello Gabriel
> > > [...]
> > > > You see there is the _ not in.normaly funcs that not find have a _
> > > > before
> > > >
> > > > To get all work, it seem i need add the same function add in math.h and
> > > > in
> > > > the linker
> > > > lib or change cmath file and remove all __builtin_ commands the
> > > > architecture
> > > > not have.
> > > I believe one should convince the middle end to emit libcall
> > > for __builtin_xxx when the target has no builtint support.
> > It of course does.
> >
> > Richard.
> Regards