bug#32773: [PATCH] Fix clang libstdc++ header location search

[David Truby <David.Truby@arm.com>]

Hi Mathieu,

Applying both your patch and my patch works for me, in both pure and
non-pure environments. I would suggest taht we also hide clang in the
same way as gcc is hidden (in favour of clang-toolchain) to avoid
confusion, but otherwise it seems these two patches together at least
get things to a working state!

I'd like to see make-clang-toolchain allow you to pick between a
specific libstdc++ or libc++, but that requires more thinking so I
think ideally it'd be better to apply these patches first to get things
to a fixed state.

Thanks
David Truby

On Thu, 2019-11-14 at 14:40 +0100, Mathieu Othacehe wrote:
> > I think adding gcc-toolchain to propagated-inputs should work in
> > principle, other than the fact that the gcc used for gcc-lib and
> > libstdc++ need to be the same as the propagated gcc-toolchain. I
> > did
> > have a fix for this but I'm not sure if it's the best way of
> > writing
> > it.
> > I'll send another patch with the fix though so at least others can
> > comment on it!
> 
> Yes propagating gcc-toolchain would work but, would also cause gcc to
> be
> available as a side effect. Maybe the patch attached, on top of
> yours,
> would work?
> 
> Thanks,
> 
> Mathieu