Debian Bug report logs - #1011496
nwall: reproducible-builds: embedded build paths in /usr/bin/nwall

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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: nwall: reproducible-builds: embedded build paths in /usr/bin/nwall

Date: Mon, 23 May 2022 16:04:57 -0700

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

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

The build path is embedded in /usr/bin/nwall:

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

  /build/1st/nwall-1.32+debian/src/nwall.c:65
  vs.
  /build/2/nwall-1.32+debian/2nd/src/nwall.c:65

The attached patch fixes this by adding -ffile-prefix-map to CFLAGS in
debian/rules, which avoids embedding the absolute build path.

Alternately, switching to use a newer debhelper compat level and the dh
build system would likely also fix this, as it includes -ffile-prefix-map
by default.


With this patch applied, nwall should build reproducibly on
tests.reproducible-builds.org!


live well,
  vagrant

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

From c5fa3d56c8c43cebc37ec635f05cf62a810c573f Mon Sep 17 00:00:00 2001
From: Vagrant Cascadian <vagrant@reproducible-builds.org>
Date: Mon, 23 May 2022 23:00:09 +0000
Subject: [PATCH] debian/rules: Add -ffile-prefix-map to CFLAGS.

---
 debian/rules | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/debian/rules b/debian/rules
index c88d7b5..69e5a1d 100755
--- a/debian/rules
+++ b/debian/rules
@@ -16,6 +16,9 @@ else
   CFLAGS += -O2
 endif
 
+# Avoid embedding the build path
+CFLAGS += -ffile-prefix-map=$(CURDIR)=.
+
 config.status: configure
 	dh_testdir
 	cp -f /usr/share/misc/config.sub config.sub
-- 
2.36.1

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