Debian Bug report logs - #1006858
libao: reproducible-builds: build path embedded in various libraries

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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: libao: reproducible-builds: build path embedded in various libraries

Date: Sun, 06 Mar 2022 14:40:36 -0800

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

Source: libao
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 and resulting Build ID for various libraries is embedded:

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

  /usr/lib/x86_64-linux-gnu/ao/plugins-4/libalsa.so

  /build/1st/libao-1.2.2+20180113/src/plugins/alsa/ao_alsa.c:301
  vs.
  /build/2/libao-1.2.2+20180113/2nd/src/plugins/alsa/ao_alsa.c:30


The attached patch to debian/rules fixes this by passing
-ffile-prefix-map via CFLAGS in the dh_auto_configure override.


Alternately, updating to use the CFLAGS passed via dh/debhelper would
also likely fix this.


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


live well,
  vagrant

[0001-debian-rules-Pass-ffile-prefix-map-via-CFLAGS-in-dh_.patch (text/x-diff, inline)]

From 5dd9ec965d3a6e299a74759966ba1d21e973d8a8 Mon Sep 17 00:00:00 2001
From: Vagrant Cascadian <vagrant@reproducible-builds.org>
Date: Sun, 6 Mar 2022 22:30:02 +0000
Subject: [PATCH] debian/rules: Pass -ffile-prefix-map via CFLAGS in
 dh_auto_configure override.

This prevents embedding the build path in various binaries.

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 ef63c1c..b37c513 100755
--- a/debian/rules
+++ b/debian/rules
@@ -16,7 +16,7 @@ override_dh_makeshlibs:
 override_dh_auto_configure:
 	ln -sf /usr/share/misc/config.sub .
 	ln -sf /usr/share/misc/config.guess .
-	dh_auto_configure -- CFLAGS='-g -Wall'
+	dh_auto_configure -- CFLAGS="-g -Wall -ffile-prefix-map=$(CURDIR)=."
 
 override_dh_auto_clean:
 	dh_auto_clean
-- 
2.35.1

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