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

From: Jeff Law <law at redhat dot com>
To: "Carlos O'Donell" <carlos at redhat dot com>, "Joseph S. Myers" <joseph at codesourcery dot com>, munroe at us dot ibm dot com
Cc: sjmunroe at us dot ibm dot com, libc-alpha at sourceware dot org, Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>, Andreas Schwab <schwab at linux-m68k dot org>, Roland McGrath <roland at hack dot frob dot com>, Adam Conrad <adconrad at 0c3 dot net>
Date: Thu, 30 Jan 2014 23:47:09 -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> <1391134218 dot 8757 dot 120 dot camel at oc8268013063 dot ibm dot com> <Pine dot LNX dot 4 dot 64 dot 1401310215430 dot 12540 at digraph dot polyomino dot org dot uk> <52EB2860 dot 5010601 at redhat dot com>

On 01/30/14 21:36, Carlos O'Donell wrote:


Adding 2.18 symbols to 2.17 creates a hybrid whose macros still
present the release as 2.17. If I change the macros then it truly
is a 2.18 release.

I count at least 6 symbols versioned at GLIBC_2.18 that would need
to be added to support a compatible 2.18 ABI:
* __cxa_thread_atexit_impl
* __issignaling
* __issignalingf
* __issignalingl
* pthread_getattr_default_np
* pthread_setattr_default_np

This release behaves more like 2.17 than 2.18, but has a 2.18 ABI.
I know of no major distribution that has shipped a hybrid like this.
I don't know what other risks there might be with this solution...

... and that worries me.

To say the least. I pondered something along these lines to addresssome issues in the past, it's unpleasant on so many levels. And itfeels a lot like a repeat of the gcc-2.96 fiasco.


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: Steven Munroe
- Re: [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17
  - From: Joseph S. Myers
- Re: [PATCH] change GLIBC PPC64/ELF2 ABI default to 2.17
  - From: Carlos O'Donell

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