Debian Bug report logs - #1020872
xvier: reproducible-builds: buildid differences in /usr/games/xvier*

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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: xvier: reproducible-builds: buildid differences in /usr/games/xvier*

Date: Tue, 27 Sep 2022 12:49:07 -0700

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

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

When the build path differs it results in a different buildid in
/usr/games/xvier*:

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

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

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

Thanks for maintaining xvier!

live well,
  vagrant

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

From a0f90b9905671ca1dcf5aed9c41af76f99ee00cc Mon Sep 17 00:00:00 2001
From: Vagrant Cascadian <vagrant@reproducible-builds.org>
Date: Tue, 27 Sep 2022 19:45:45 +0000
Subject: [PATCH] debian/rules: Add -ffile-prefix-map to CFLAGS to avoid
 embedding the build path.

https://reproducible-builds.org/docs/build-path/
---
 debian/rules | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/debian/rules b/debian/rules
index 45388d2..c7e4544 100755
--- a/debian/rules
+++ b/debian/rules
@@ -7,6 +7,9 @@ ifeq "$(findstring noopt,$(DEB_BUILD_OPTIONS))" ""
 CFLAGS += -O2
 endif
 
+# Avoid embedding build path for reproducible builds
+CFLAGS += -ffile-prefix-map=$(CURDIR)=.
+
 build: xvier debian/rules
 xvier: xvier.c
 	xmkmf
-- 
2.37.2

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