From: Luca Boccassi <bluca@debian.org>
Date: Thu, 4 Apr 2024 22:42:45 +0000 (+0100)
Subject: meson: set -fno-ssa-phiopt when building bpf with gcc
X-Git-Tag: v256-rc1~297
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ce28e5a248b15e278e8585c154c38c31574ca83;p=thirdparty%2Fsystemd.git

meson: set -fno-ssa-phiopt when building bpf with gcc

There are bugs in the kernel verifier that cause legitimate code
to be rejected, disabling this optimization makes bpf programs
built with a new enough gcc work again.

Fixes https://github.com/systemd/systemd/issues/31888
---

diff --git a/meson.build b/meson.build
index f4b382c6023..1c4cac82c11 100644
--- a/meson.build
+++ b/meson.build
@@ -1701,6 +1701,7 @@ if conf.get('BPF_FRAMEWORK') == 1
         bpf_gcc_flags = [
                 '-std=gnu11',
                 '-fno-stack-protector',
+                '-fno-ssa-phiopt',
                 '-O2',
                 '-mcpu=v3',
                 '-mco-re',