From 253da2e6fc0aa01cbd1b249cfcca35d9fe7740ba Mon Sep 17 00:00:00 2001 From: "mark.yang" Date: Thu, 22 Jan 2026 14:51:43 +0900 Subject: [PATCH] lto.inc: add clang specific LTO configuration This commit adds support for Clang-specific LTO options. 1. -fuse-linker-plugin is not supported by Clang. 2. -ffat-lto-objects is used to ensure that object files (.o) are generated as ELF even when LTO is applied. During the dwarfsrcfiles process, if LTO is used with the Clang toolchain, static library object files are skipped if they are LLVM bitcode instead of ELF. Therefore, it is recommended to add this to LTOEXTRA if necessary. 3. Adding 'thin-lto' to DISTRO_FEATURES enables -flto=thin. Signed-off-by: mark.yang Signed-off-by: Antonin Godard Signed-off-by: Richard Purdie --- meta/conf/distro/include/lto.inc | 2 ++ 1 file changed, 2 insertions(+) diff --git a/meta/conf/distro/include/lto.inc b/meta/conf/distro/include/lto.inc index b8193725a15..227f0c5c2a1 100644 --- a/meta/conf/distro/include/lto.inc +++ b/meta/conf/distro/include/lto.inc @@ -45,6 +45,8 @@ LTOEXTRA ?= "" # code from .a files to linker LTO ?= "-flto -ffat-lto-objects -fuse-linker-plugin ${LTOEXTRA}" +LTO:toolchain-clang = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin ${LTOEXTRA}', '-flto ${LTOEXTRA}', d)}" + SELECTED_OPTIMIZATION:append = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}" TARGET_LDFLAGS:append:class-target = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}" -- 2.47.3