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Re: [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17

From: Jeff Law <law at redhat dot com>
To: Andreas Jaeger <aj at suse dot com>, munroesj at us dot ibm dot com, Adam Conrad <adconrad at 0c3 dot net>, "Carlos O'Donell" <carlos at redhat dot com>
Cc: libc-alpha at sourceware dot org, Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
Date: Thu, 30 Jan 2014 10:32:32 -0700
Subject: Re: [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17
Authentication-results: sourceware.org; auth=none
References: <1391008726 dot 16702 dot 105 dot camel at spokane1 dot rchland dot ibm dot com> <52EA5D7A dot 9000903 at suse dot com> <1391095043 dot 16702 dot 200 dot camel at spokane1 dot rchland dot ibm dot com> <52EA75E4 dot 2050700 at suse dot com>

On 01/30/14 08:55, Andreas Jaeger wrote:

The GLIBC 2.19 will be the 2.19 ABI and the GLIBC-2.17 will be the 2.17
ABI. We want to insure that PPC64LE ELF2 binary build on GLIBC-2.17 will
run on a 2.18 or 2.19 or later GLIBC. We do not expect a binary build on
2.19 will run on GLIBC 2.18 or 2.17. But this the normal definition.


An ABI is more than just the default symbol version.

I'm asking for a stability promise of the ABI that will be in glibc.

What if the implemented 2.17 glibc used by Carlos is by accident
incompatible to the 2.19 ABI? Which ABI will then be broken to get those
compatible again.

That would, of course, be a disaster. I'm going to trust Carlos & histeam that this won't happen. Given glibc's ability to maintain ABIcompatibility through the years, I'm not terribly concerned here.

I actually worry more about how GCC/LD play into the ABI issues --there's plenty of risk with a newly defined ABI like this that cornercases which affect the ABI definition are still lurking out there. Butthat's another discussion for another list :(



Jeff

References:
- [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17
  - From: Steven Munroe
- Re: [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17
  - From: Andreas Jaeger
- Re: [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17
  - From: Steven Munroe
- Re: [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17
  - From: Andreas Jaeger

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