Debian Bug report logs - #1024283
ipsvd: reproducible-builds: buildid differences in various binaries

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Vagrant Cascadian <vagrant@reproducible-builds.org>

To: submit@bugs.debian.org

Subject: ipsvd: reproducible-builds: buildid differences in various binaries

Date: Wed, 16 Nov 2022 15:33:23 -0800

[Message part 1 (text/plain, inline)]

Source: ipsvd
Severity: normal
Tags: patch
User: reproducible-builds@lists.alioth.debian.org
Usertags: buildpath
X-Debbugs-Cc: reproducible-bugs@lists.alioth.debian.org

The buildid differs when built from a different path for various
binaries in /usr/bin:

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/ipsvd.html

The attached patch to debian/rules fixes this by adding
-ffile-prefix-map to CFLAGS.

Switching to dh and a recent debhelper compat level might also solve
this problem.

According to my local tests, with this patch applied, ipsvd should
build reproducibly on tests.reproducible-builds.org!

Thanks for maintaining ipsvd!

live well,
  vagrant

[0001-debian-rules-Add-ffile-prefix-map-to-CFLAGS-to-avoid.patch (text/x-diff, inline)]

From 7310c68df7db93c4b837e18e70cebfde1a60f9ae Mon Sep 17 00:00:00 2001
From: Vagrant Cascadian <vagrant@reproducible-builds.org>
Date: Wed, 16 Nov 2022 23:30:03 +0000
Subject: [PATCH] debian/rules: Add -ffile-prefix-map to CFLAGS to avoid
 embedding build paths.

https://reproducible-builds.org/docs/build-path/
---
 debian/rules | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/debian/rules b/debian/rules
index f3d69a5..97ec522 100755
--- a/debian/rules
+++ b/debian/rules
@@ -5,7 +5,7 @@ ifneq (,$(findstring nostrip,$(DEB_BUILD_OPTIONS)))
   STRIP =: nostrip
 endif
 
-CFLAGS =-g -O2 -Wall
+CFLAGS =-g -O2 -Wall -ffile-prefix-map=$(CURDIR)=.
 LDFLAGS =-Os
 CC =gcc
 ifneq (,$(findstring diet,$(DEB_BUILD_OPTIONS)))
-- 
2.38.1

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