From f4a79cc138ed50022acc85c5ae1f4c10e860b52a Mon Sep 17 00:00:00 2001
From: David Adam <zanchey@ucc.gu.uwa.edu.au>
Date: Fri, 17 May 2024 23:40:07 +0800
Subject: [PATCH] debian packaging: disable LTO build profile

Fixes the build on Ubuntu distributions with aggressive enabling of LTO
for all builds.

This build profile sets CFLAGS and CXXFLAGS in a way that prevents cargo
tests from linking. This manifests as errors like:

= note: make[5]: *** read jobs pipe: Bad file descriptor.  Stop.
        make[5]: *** Waiting for unfinished jobs....
        lto-wrapper: fatal error: make returned 2 exit status
        compilation terminated.
        /usr/bin/ld: error: lto-wrapper failed
        collect2: error: ld returned 1 exit status
---
 debian/rules | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/debian/rules b/debian/rules
index fb3b43cba..f72092e64 100755
--- a/debian/rules
+++ b/debian/rules
@@ -3,6 +3,9 @@
 
 # Uncomment this to turn on verbose mode.
 export DH_VERBOSE=1
+# The LTO profile sets CFLAGS/CXXFLAGS which confuse the compilation process; disable it
+# LTO is still performed by rustc based on Cargo.toml
+export DEB_BUILD_MAINT_OPTIONS=optimize=-lto
 
 %:
 	dh $@