[PATCH v6 2/3] Add default implementation of fenv.h and all methods

[Joel Sherrill]

On Mon, Aug 12, 2019 at 3:21 AM Corinna Vinschen <vinschen@redhat.com>
wrote:

> On Aug  9 09:50, Corinna Vinschen wrote:
> > On Aug  8 15:04, Joel Sherrill wrote:
> > > On Thu, Aug 8, 2019 at 2:05 PM Corinna Vinschen <vinschen@redhat.com>
> wrote:
> > >
> > > > On Aug  8 11:27, joel@rtems.org wrote:
> > > > > +/*
> > > > > + * This is a non-functional implementation that should be
> overridden
> > > > > + * by an architecture specific implementation in
> > > > newlib/libm/machine/ARCH.
> > > > > + *
> > > > > + * The implmentation must defined FE_DFL_ENV to point to a default
> > > > > + * environment of type fenv_t.
> > > > > + */
> > > > > +static const fenv_t fe_dfl_env = { 0 };
> > > > > +const fenv_t *_fe_dfl_env = &fe_dfl_env;
> > > >
> > > > Bummer.  This doesn't work.  The problem is that Cygwin needs to
> > > > initialize fe_dfl_env, like this:
> > > >
> > > >   fegetenv (&fe_dfl_env);
> > > >
> > > > However, even if I drop `const' as in Cygwin, if fe_dfl_env is static
> > > > I can't access it from the _feinitialise() function at DLL init time.
> > > >
> > > > I'm not quite sure how to fix this.  Any ideas?  Do I have to drop
> > > > the idea to reuse this file and we need our own target-specific one?
> > > >
> > >
> > > I'm not opposed to making it non-const and not static. Whatever it
> > > takes to make it work on Cygwin.
> >
> > Ok, if nobody else disagrees.  I'll wait over the weekend.
> >
> > I think, if the variable is non-static it should start with two
> > underscores.  This was no problem in Cygwin which only exports symbols
> > we add to a linker definition file, but in case of a "normal" lib, it
> > makes probably sense not to pollute the namespace.
> >
> > You don't have to create another patch in that case, I care for it.
>
> Pushed with the req. changes for Cygwin.
>

Thank you. I am glad you found the magic for Cygwin and pushed it.




>
> Thanks,
> Corinna
>
> --
> Corinna Vinschen
> Cygwin Maintainer
> Red Hat
>