This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)

From: Bernd Schmidt <bschmidt at redhat dot com>
To: Daniel Kahn Gillmor <dkg at fifthhorseman dot net>, Joseph Myers <joseph at codesourcery dot com>
Cc: gcc-patches at gcc dot gnu dot org, rb-general at lists dot reproducible-builds dot org, anthraxx at archlinux dot org, niels at thykier dot net
Date: Tue, 15 Dec 2015 13:19:30 +0100
Subject: Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
Authentication-results: sourceware.org; auth=none
References: <87egf1mxfl dot fsf at alice dot fifthhorseman dot net> <1449768978-3872-1-git-send-email-dkg at fifthhorseman dot net> <alpine dot DEB dot 2 dot 10 dot 1512102357320 dot 14974 at digraph dot polyomino dot org dot uk> <87h9jpkfli dot fsf at alice dot fifthhorseman dot net> <87si39gcc0 dot fsf at alice dot fifthhorseman dot net> <566B01E0 dot 2090706 at redhat dot com> <87poychk78 dot fsf at alice dot fifthhorseman dot net>

On 12/11/2015 08:14 PM, Daniel Kahn Gillmor wrote:

I think you mean so that we would just ignore -fdebug-prefix-map
entirely when writing DW_AT_producer, so that you could build
reproducibly with (for example):

  gcc -fdebug-prefix-map=$(pwd)=/usr/src

We'd considered and discarded this approach in the past out of concern
for possible build systems that can easily vary the environment, but
work with a static list of CFLAGS to pass to the compiler.  On further
inspection, it's not clear that anyone has a concrete example of a build
system with this constraint.

Here's a one-liner patch for this approach (also at
https://gcc.gnu.org/bugzilla/attachment.cgi?id=37007):


I think that one-liner is fine, even for now.


Bernd

Follow-Ups:
- Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
  - From: Daniel Kahn Gillmor

References:
- [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
  - From: Daniel Kahn Gillmor
- Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
  - From: Joseph Myers
- Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
  - From: Daniel Kahn Gillmor
- Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
  - From: Daniel Kahn Gillmor
- Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
  - From: Bernd Schmidt
- Re: [PATCH] gcc: read -fdebug-prefix-map OLD from environment (improved reproducibility)
  - From: Daniel Kahn Gillmor

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]