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 <richard.pur...@linuxfoundation.org>
---
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 1fe01146d6b..ef5545bf705 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}')"
--
2.30.2
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