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

On Thu, 14 Nov 2013, Adam Conrad wrote:

> On Wed, Nov 13, 2013 at 03:38:00PM +0000, Joseph S. Myers wrote:
> > 
> > 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.
> There's intent to release likely more than one distribution based on
> glibc 2.18 and backported powerpc64le patches from 2.19/trunk.  If
> we version @2.18 and upstream versions @2.19, we either force a nasty
> ABI horizon we need to fix, or we need to carry a version patch for,
> well, ever, and be gratuitously incompatible with upstream.  Neither
> of those is appealing.

You can also use GLIBC_2.19 versions in your backport based on 2.18.  You 
may lose some compatibility checking for binaries using any symbols that 
are actually new in 2.19 and not in your backport, or get incompatibility 
if a symbol changes incompatibly between 2.18 and 2.19 (but so far only 
hppa has a new symbol at version 2.19), but that's generically the best 
thing to do in cases where a distributor wants to backport an individual 
new symbol, for example - have that symbol at its upstream version.

Joseph S. Myers

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