From 0bc3a902c6067a98376c89efdf92dcd130d0a73f Mon Sep 17 00:00:00 2001
From: Flatcar Buildbot <buildbot@flatcar-linux.org>
Date: Mon, 22 May 2023 07:13:52 +0000
Subject: [PATCH] eclass/flag-o-matic: Sync with Gentoo

It's from Gentoo commit b5a4bfb180d002c29b35bfc267e47857ba481fb8.
---
 .../src/third_party/portage-stable/eclass/flag-o-matic.eclass | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass b/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass
index 6bec3df308..bef3abf69d 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass
@@ -47,11 +47,11 @@ setup-allowed-flags() {
 # Note: shell globs and character lists are allowed
 _setup-allowed-flags() {
 	ALLOWED_FLAGS=(
-		-pipe -O '-O[12sg]' '-mcpu=*' '-march=*' '-mtune=*'
+		-pipe -O '-O[123szg]' '-mcpu=*' '-march=*' '-mtune=*'
+		-flto '-flto=*' -fno-lto
 
 		# Hardening flags
 		'-fstack-protector*'
-		'-fstack-check*' -fno-stack-check
 		-fstack-clash-protection
 		'-fcf-protection=*'
 		-fbounds-check -fbounds-checking