Re: [PATCH] PowerPC64 ELFv2 ABI 6/6: Bump ld.so soname version number

["Joseph S. Myers" <joseph at codesourcery dot com>]

On Wed, 13 Nov 2013, Ulrich Weigand wrote:

> Joseph Myers wrote:
> 
> > There's also the matter of setting the minimum symbol version in this case 
> > to GLIBC_2.19.  And having configure tests to ensure the only combinations 
> > are the (BE, ELFv1) and (LE, ELFv2) combinations it's desired to support.
> 
> So I understand Alan Modra already checked in a change to shlib-versions to
> set the minimum symbol version for powerpc64le.  If we only use ELFv2 with
> powerpc64le, is there anything else that needs to be done?

The version there is wrong - it should be GLIBC_2.19, not GLIBC_2.18, 
since the 2.18 release did not in fact support little-endian.  But apart 
from that, just the configure checks.

> As to the configure check, I guess we could add something along these lines
> to the configure.ac file I added:
> 
> # We support only the ELFv1 ABI on big-endian powerpc64-linux,
> # and only the ELFv2 ABI on little-endian powerpc64le-linux.
> if test -z "$enable_hacker_mode"; then
>   if test "$config_machine" = powerpc64le; then
>     if test $libc_cv_ppc64_elfv2_abi = no; then
>       AC_MSG_ERROR([Only the ELFv2 ABI is supported on powerpc64le-linux.])
>     fi
>   else
>     if test $libc_cv_ppc64_elfv2_abi = yes; then
>       AC_MSG_ERROR([Only the ELFv1 ABI is supported on powerpc64-linux.])
>     fi
>   fi
> fi
> 
> Is this what you were thinking about?

Yes, but I wouldn't have the enable_hacker_mode conditional; make the 
errors unconditional just like the existing check that IBM long double is 
required in sysdeps/unix/sysv/linux/powerpc/configure.ac.  (And it looks 
like the check that little-endian powerpc32 isn't supported is still 
needed as well.)

-- 
Joseph S. Myers
joseph@codesourcery.com