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Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.

From: Florian Weimer <fweimer at redhat dot com>
To: Andreas Schwab <schwab at linux-m68k dot org>, Stefan Liebler <stli at linux dot vnet dot ibm dot com>
Cc: libc-alpha at sourceware dot org, "Joseph S. Myers" <joseph at codesourcery dot com>, "Paul E. Murphy" <murphyp at linux dot vnet dot ibm dot com>
Date: Fri, 5 Aug 2016 10:34:16 +0200
Subject: Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
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References: <1466682952-6301-1-git-send-email-stli@linux.vnet.ibm.com> <23c1158b-a7b5-6da1-1ce4-90c6f0e9b733@linux.vnet.ibm.com> <579B6CD8.7030607@linux.vnet.ibm.com> <c70c9395-a6b8-b47d-6286-8e5540762f5e@linux.vnet.ibm.com> <nnq9fr$j40$1@blaine.gmane.org> <58d9b9cb-0f2e-dace-30a7-41c15525d0ff@redhat.com> <alpine.DEB.2.20.1608031544250.19178@digraph.polyomino.org.uk> <0b3bc358-2cfe-0f62-1a1d-f9980c201056@linux.vnet.ibm.com> <8760rflips.fsf@linux-m68k.org>

On 08/05/2016 10:31 AM, Andreas Schwab wrote:

On Fr, Aug 05 2016, Stefan Liebler <stli@linux.vnet.ibm.com> wrote:

Requiring a specific gcc / binutils version does not work. E.g. on s390x a
gcc 4.7.4 has attribute ifunc support.
According to <gcc-src>/gcc/configure.ac there is an option
--enable-gnu-indirect-function. If it is not specified it defaults to
default_gnu_indirect_function variable. This is set to yes in
<gcc-src>/gcc/config.gcc for intel / s390. Otherwise it is no.


That should probably be updated, then.

I agree. Can we require that GCC is configured with--enable-gnu-indirect-function for future glibc releases, please?


Thanks,
Florian

Follow-Ups:
- Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
  - From: Paul E. Murphy

References:
- Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
  - From: Paul E. Murphy
- Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
  - From: Stefan Liebler
- Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
  - From: Florian Weimer
- Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
  - From: Joseph Myers
- Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
  - From: Stefan Liebler
- Re: [PATCH 1/8] Use gcc attribute ifunc in libc_ifunc macro instead of inline assembly due to false debuginfo.
  - From: Andreas Schwab

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