[Buildroot] [PATCH] glibc: add version 2.24

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2016-08-09 10:49 +0200, Thomas Petazzoni spake thusly:
> On Mon, 8 Aug 2016 18:42:09 +0200, Yann E. MORIN wrote:
> 
> > > It is not written completely clearly: they first say that on
> > > x86/x86-64, 2.6.32 is sufficient, but they conclude that 3.2 is the
> > > minimum version on all architectures. It would be good to clarify this
> > > aspect.  
> > 
> > What this means, at least what I understand it means, is that:
> > 
> >   - glibc 2.24 will not *run* on kernels more ancient than 3.2, except on
> >     x86/x86_64, when it will not run on kernels older than 2.6.32.
> > 
> >     This is a runtime dependency.
> > 
> >   - glibc needs kernel headers 3.2 (or later) for all architectures,
> >     even for x86/x86_64.
> > 
> >     This is a built-time dependency.
> 
> OK. From Buildroot's perspective, all what matters is the build-time
> dependency. If the 3.2 kernel headers are needed to build glibc 2.24,
> then glibc 2.24 should depend on headers >= 3.2.

Yes. That's what Vicente did in his v3 of his patch:
    https://patchwork.ozlabs.org/patch/657159/

> > > Regardless of this detail, this means we will have to encode this
> > > dependency somehow. Indeed, we still have people using kernels older
> > > than 3.2 I believe on various platforms.  
> > 
> > On all but x86_x86_64, yes.
> 
> I don't get this. From my point of view, the x86/x86_64 "exception" is
> of no use to us: all we are interested in is the build-time dependency.

Well, I mixed it a bit in my head... What I was thinking was that we
should still allow building a glibc-based toolchain even if the running
kernel was older than 3.2 for x86/x86_64. But we have no way to enforce
that: we have no _AT_LEAST_X_Y symbols for the running kernel (not that
we want to have them).

Regards,
Yann E. MORIN.

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