[OE-core] [OE-Core][PATCH 1/2] libgpg-error: Support build for native on ppc host

[Richard Purdie]

On Sat, 2019-01-12 at 17:56 +0200, Serhey Popovych wrote:
> Richard Purdie wrote:
> > On Sat, 2019-01-12 at 12:11 +0200, Serhey Popovych wrote:
> > > In Ubuntu 16.04 LTS userspace is build for PowerPC 32-bit while
> > > kernel
> > > selected by the installer depending on PowerPC machine type:
> > > 
> > >   * 32-bit for PowerMac G4 (ppc7400) and below
> > >   * 64-bit for PowerMac G5 and above
> > > 
> > > Thus uname(2) returns ppc64 for 64-bit kernels and 32-bit
> > > userspace
> > > making build impossible due to missing some of lib64 multilib
> > > equivalents in Ubuntu repository.
> > > 
> > > Using setarch(8) override to make whole host look as PowerPC 32-
> > > bit
> > > can actually help with build but requires mapping for ppc target
> > > to
> > > their libgpg-error equivalent to fix native build.
> > > 
> > > Build tested on Ubuntu 16.04 LTS host on PowerMac G5 with
> > > command:
> > > 
> > >   MACHINE=qemuppc setarch ppc bitbake core-image-full-cmdline
> > > 
> > > Signed-off-by: Serhey Popovych <serhe.popovych at gmail.com>
> > > ---
> > >  meta/recipes-support/libgpg-error/libgpg-error_1.33.bb | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/meta/recipes-support/libgpg-error/libgpg-
> > > error_1.33.bb
> > > b/meta/recipes-support/libgpg-error/libgpg-error_1.33.bb
> > > index 325529d..4153954 100644
> > > --- a/meta/recipes-support/libgpg-error/libgpg-error_1.33.bb
> > > +++ b/meta/recipes-support/libgpg-error/libgpg-error_1.33.bb
> > > @@ -47,6 +47,7 @@ do_compile_prepend() {
> > >  	  mips*el)    TUPLE=mipsel-unknown-linux-gnu ;;
> > >  	  mips*)      TUPLE=mips-unknown-linux-gnu ;;
> > >  	  x86_64)     TUPLE=x86_64-unknown-linux-gnu ;;
> > > +	  ppc)        TUPLE=powerpc-unknown-linux-gnu ;;
> > >  	  ppc64)      TUPLE=powerpc64-unknown-linux-gnu ;;
> > >  	  ppc64le)    TUPLE=powerpc64le-unknown-linux-gnu ;;
> > >  	  *)          TUPLE=${TARGET_ARCH}-unknown-linux-gnu ;;
> > 
> > This doesn't feel correct. It only works if you're using the local
> > setarch workaround and I'm worried most users are never going to
> > find
> > that.
> > 
> > I'm fine with adding in general fixes but this is getting very
> > specific
> > to an very uncommon usecase :(
> 
> Understand your position. Doing setarch(8) to run bitbake on ppc64
> kernel with 32-bit user space with missing 64-bit multilib seems to
> be the only option.
> 
> Anyway this change just maps ppc to corresponding tuple used by
> libgpg-error, so with this fix we hit both
> 
>   a) setarch(1) when kernel is 64-bit and userspace is 32-bit and
>      no multilib
>   b) native 32-bit powerpc host that is running as virtual machine
> for
>      example).

I'd understand that if this were just libgpg-error-native but our
qemuppc builds work which I guess is why I don't quite understand what
is wrong here?

Cheers,

Richard