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

Corinna Vinschen <[email protected]> Fri, 9 Aug 2019 09:56:49 +0200

Newsgroups	gmane.comp.lib.newlib
Message-ID	<[email protected]>

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 <[email protected]> wrote:
> > 
> > > On Aug  8 11:27, [email protected] 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.

Oh, btw., this is not exactly Cygwin only.  As I wrote before,
the code should be usable for other x86{_64} targets as well.


Corinna

-- 
Corinna Vinschen
Cygwin Maintainer
Red Hat

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