From b70d0bd98068028d33f9a825a07a7b71e1b54e5e Mon Sep 17 00:00:00 2001
From: Paride Legovini <paride@debian.org>
Date: Thu, 4 Aug 2022 13:29:04 +0200
Subject: [PATCH] Disable LTO on non-amd64 builds

Coroutines fail with LTO on non-amd64 architectures, see:
- https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1921664
- https://bugzilla.redhat.com/show_bug.cgi?id=1952483

Debian doesn't enable LTO by default yet, but this is likely to happen
at some point [1]. For the moment this fixes Debian builds when LTO is
manually enabled and builds in downstream distros where LTO is enabled
by default (e.g. Ubuntu).

[1] https://lists.debian.org/debian-devel/2022/06/msg00092.html

LP: #1921664
---
 debian/rules | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/debian/rules b/debian/rules
index f6aabc91f2..39fe1c50a0 100755
--- a/debian/rules
+++ b/debian/rules
@@ -14,6 +14,13 @@ ifeq (${DEB_HOST_MULTIARCH},)
    $(foreach d, $(shell dpkg-architecture | sed 's/=/?=/'), $(eval export $d))
 endif
 
+# Disable LTO on non-amd64 builds, see:
+# https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1921664
+# https://bugzilla.redhat.com/show_bug.cgi?id=1952483
+ifneq ($(DEB_HOST_ARCH),amd64)
+  export DEB_BUILD_MAINT_OPTIONS += optimize=-lto
+endif
+
 ifeq ($(shell dpkg-vendor --derives-from Ubuntu && echo yes),yes)
 VENDOR := UBUNTU
 DEB_BUILD_PARALLEL = yes
-- 
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