[Buildroot] [PATCH v3 1/1] package/meson: fix cpu_family format

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

James, All,

On 2018-12-26 02:34 -0600, James Hilliard spake thusly:
> On Wed, Dec 26, 2018 at 2:00 AM Yann E. MORIN <yann.morin.1998@free.fr> wrote:
> > On 2018-12-25 19:56 +0100, Yann E. MORIN spake thusly:
> > > On 2018-12-17 07:14 +0800, james.hilliard1 at gmail.com spake thusly:
> > > > From: James Hilliard <james.hilliard1@gmail.com>
> > > >
> > > > Meson expects the cpu_family to be in a specific format for
> > > > cross compilation, otherwise packages that use cpu_family
> > > > detection may fail to build.
> > >
> > > As explained in:
> > >     https://mesonbuild.com/Reference-tables.html#cpu-families
> > >
> > > > We also need to set needs_exe_wrapper = true to ensure that
> > > > meson won't try and execute test binaries.
> > >
> > > As explained in:
> > >     https://mesonbuild.com/Cross-compilation.html
> > >
> > > Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> >
> > Well, now I think this should have really been two patches, like Thomas
> > initially suggested:
> >
> >  1- prevent meson from ever thinking it can run what it builds, and so
> >     add needs_exe_wrapper on its own, because we may already have that
> >     situation today (e.g. x86_64 targetting x86_64)
> We actually never get that issue right now AFAICT because we are
> setting the wrong cpu_family so the host target comparison always
> fails to match.

But for x86_64, we currently do pass the correct value 'x86_64', so the
comparison does not fail when both the host and target are x86_64.

And since meson only uses the CPU familly name and the 'system' name to
decide, and that the 'system' name is linux in both cases, then we do
have the issue currently, even if it never got triggered yet.

Regards,
Yann E. MORIN.

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