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Bug#1020806: perl-byacc: reproducible-builds: differing buildid in in /usr/bin/pbyacc



Source: perl-byacc
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 in /usr/bin/pbyacc when built with a different build
path:

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

The attached patch fixes this in the upstream Makefile by adding
-ffile-prefix-map to CFLAGS.

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

Thanks for maintaining perl-byacc!

live well,
  vagrant
From 1002dd61fdf333b0266ce59cd3053e6812905727 Mon Sep 17 00:00:00 2001
From: Vagrant Cascadian <vagrant@reproducible-builds.org>
Date: Mon, 26 Sep 2022 23:55:37 +0000
Subject: [PATCH] Makefile: Add -ffile-prefix-map to CFLAGS to avoid embedding
 build path.

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

diff --git a/Makefile b/Makefile
index 077e9ea..1dd3c07 100644
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ SIG_TYPE      = void
 
 CPPFLAGS      = $(RINDEX) -DPROGRAM=\"$(PROGRAM)\" -DSIG_TYPE=$(SIG_TYPE)
 
-CFLAGS	      = -O2 -g $(CPPFLAGS)
+CFLAGS	      = -O2 -g -ffile-prefix-map=$(CURDIR)=. $(CPPFLAGS)
 
 CC	      = gcc -Wall
 CPP	      = /lib/cpp	      
-- 
2.37.2

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