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Re: tst-prelink fails when built with -fPIC

From: Aurelien Jarno <aurelien at aurel32 dot net>
To: Joseph Myers <joseph at codesourcery dot com>
Cc: libc-alpha at sourceware dot org
Date: Fri, 25 Nov 2016 19:15:14 +0100
Subject: Re: tst-prelink fails when built with -fPIC
Authentication-results: sourceware.org; auth=none
References: <20161125102832.gcctvfrpr7yj6i3e@aurel32.net> <alpine.DEB.2.20.1611251717310.12591@digraph.polyomino.org.uk>

On 2016-11-25 17:20, Joseph Myers wrote:
> On Fri, 25 Nov 2016, Aurelien Jarno wrote:
> 
> > Hi all,
> > 
> > Debian builds gcc 6.2 with --enable-default-pie, which correspond to
> > always passing -pie -fPIE -fPIC. This causes the tst-prelink to fail on
> 
> Why -fPIC?  It's documented as -fPIE -pie, *not* -fPIC.

You are correct it's only -fPIE. Now using either -fno-PIE or -fno-PIC
makes the tst-prelink to pass. But -fno-PIE is the correct option here.

> Now, -fPIE ends up with glibc building with -DPIC, and in some cases that 
> may break things if code isn't ready for PIC building outside shared 
> libraries.  Those cases can be fixed individually.

Indeed. I have already send a patch for x86-64, I am currently testing a
patch for s390.

Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net

References:
- tst-prelink fails when built with -fPIC
  - From: Aurelien Jarno
- Re: tst-prelink fails when built with -fPIC
  - From: Joseph Myers

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