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Re: [PATCH] Do not build libsanitizer also for powerpc--linux*

From: Yury Gribov <y dot gribov at samsung dot com>
To: Jakub Jelinek <jakub at redhat dot com>, ramrad01 at arm dot com
Cc: Peter Bergner <bergner at vnet dot ibm dot com>, Thomas Schwinge <thomas at codesourcery dot com>, Arseny Solokha <asolokha at gmx dot com>, DodjiSeketeli <dodji at redhat dot com>, kcc at google dot com, Dmitry Vyukov <dvyukov at google dot com>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 02 Jun 2014 13:44:22 +0400
Subject: Re: [PATCH] Do not build libsanitizer also for powerpc*-*-linux*
Authentication-results: sourceware.org; auth=none
References: <1401100995 dot 27542 dot ezmlm at gcc dot gnu dot org> <53831D22 dot 30108 at gmx dot com> <87egzeqrrt dot fsf at kepler dot schwinge dot homeip dot net> <1401390478 dot 7849 dot 39 dot camel at otta> <1401455362 dot 7849 dot 42 dot camel at otta> <20140530134933 dot GZ10386 at tucnak dot redhat dot com> <538C1813 dot 8070602 at samsung dot com> <20140602075637 dot GH10386 at tucnak dot redhat dot com> <CAJA7tRbpBNriZ7ZiYoYSdL9swv2qyxz4FpfpufOw14nWS6C1Tg at mail dot gmail dot com> <20140602092815 dot GJ10386 at tucnak dot redhat dot com>

Why the  -1 ? No ARM or Thumb instruction is 1 byte long. Instructions
are 4 bytes long if in ARM state and could be 2 or 4 bytes if Thumb
state.


The -1 just points to the middle of previous instruction,
so that supposedly it can be looked up in debug info etc.

Right, that works quite well with gdb, addr2line, etc. I once triedadding proper handling of ARM/Thumb but this complicated code with noreal benefit.

-Y

Follow-Ups:
- Re: [PATCH] Do not build libsanitizer also for powerpc*-*-linux*
  - From: Ramana Radhakrishnan

References:
- Re: [PATCH] Do not build libsanitizer also for powerpc*-*-linux*
  - From: Yury Gribov
- Re: [PATCH] Do not build libsanitizer also for powerpc*-*-linux*
  - From: Jakub Jelinek
- Re: [PATCH] Do not build libsanitizer also for powerpc*-*-linux*
  - From: Ramana Radhakrishnan
- Re: [PATCH] Do not build libsanitizer also for powerpc*-*-linux*
  - From: Jakub Jelinek

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Re: [PATCH] Do not build libsanitizer also for powerpc*-*-linux*

Re: [PATCH] Do not build libsanitizer also for powerpc--linux*