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Re: ATT: gcc maintainer (was Re: cpp does not honor the -undef option.)

On 1/16/06, Peter Ekberg <> wrote:
> On Mon, Jan 09, 2006 at 10:58:00AM +0100, Peter Ekberg wrote:
> > Hello!
> >
> > I recently tried to build a package that was using cpp for other
> > purposes than preprocessing C files. Its configure script was
> > looking for a way to not have cpp predefine anything, and it
> > specifically tried the -undef option, but failed. From reading the
> > docs, I couldn't figure out why. Here's a quote from "info cpp":
> >
> > '-undef'
> >      Do not predefine any system-specific or GCC-specific macros.  The
> >      standard predefined macros remain defined.  *Note Standard
> >      Predefined Macros::.

Apparently some macros must remain defined.  What macros specifically
did you notice still defined that you would consider "system-specific"
(i.e. __cygwin__ or __CYGWIN__ or CYGWIN) or "gcc-specific"?

> >
> > So I searched the web a bit and figured that I could probably fix
> > it in the specs file. I realise that the specs file probably isn't
> > the canonical place to change this, but I'll leave that to the gcc
> > maintainer.
> >
> > Attached is a patch for the specs file that wraps all old define
> > rules for cpp inside the following:
> >
> > %{!undef:old define rules}
> >
> > I don't know if this is the correct thing to do, but it works for
> > me<TM>.
> GCC maintainer, are you there? Can you come out and play, please? :-)
> Cheers,
> Peter
> --
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