From 627b6ed763eca90192203932784872b60a65fcaa Mon Sep 17 00:00:00 2001 From: Richard Purdie Date: Wed, 12 May 2021 22:28:23 +0100 Subject: [PATCH] ovmf: Disable lto to aid reproducibility lto tends to break reproducibility and makes ovmf near impossible to debug reproducibility issues in. Disable it and supress the warnings that then generates from Werror. Signed-off-by: Richard Purdie --- meta/recipes-core/ovmf/ovmf_git.bb | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/meta/recipes-core/ovmf/ovmf_git.bb b/meta/recipes-core/ovmf/ovmf_git.bb index 1fe01146d6..ef5545bf70 100644 --- a/meta/recipes-core/ovmf/ovmf_git.bb +++ b/meta/recipes-core/ovmf/ovmf_git.bb @@ -102,15 +102,22 @@ fix_toolchain_append_class-native() { # to make ovmf-native reusable across distros. sed -i \ -e 's#^\(DEFINE GCC.*DLINK.*FLAGS *=\)#\1 -fuse-ld=bfd#' \ + -e 's#-flto#-fno-lto#g' \ + -e 's#-DUSING_LTO##g' \ ${S}/BaseTools/Conf/tools_def.template } +# We disable lto above since the results are not reproducible and make it hard to compare +# binary build aretfacts to debug reproducibility problems. +# Surprisingly, if you disable lto, you see compiler warnings which are fatal. We therefore +# have to hack warnings overrides into GCC_PREFIX_MAP to allow it to build. + # We want to pass ${DEBUG_PREFIX_MAP} to gcc commands and also pass in # --debug-prefix-map to nasm (we carry a patch to nasm for this). The # tools definitions are built by ovmf-native so we need to pass this in # at target build time when we know the right values. export NASM_PREFIX_MAP = "--debug-prefix-map=${WORKDIR}=/usr/src/debug/ovmf/${EXTENDPE}${PV}-${PR}" -export GCC_PREFIX_MAP = "${DEBUG_PREFIX_MAP}" +export GCC_PREFIX_MAP = "${DEBUG_PREFIX_MAP} -Wno-stringop-overflow -Wno-maybe-uninitialized" GCC_VER="$(${CC} -v 2>&1 | tail -n1 | awk '{print $3}')" -- 2.40.1