From cc90f8c3b9aaa25307959a091076b78cd58ea142 Mon Sep 17 00:00:00 2001 From: "mark.yang" Date: Fri, 30 Jan 2026 18:54:52 +0900 Subject: [PATCH] lto.inc: introduce LTO_DEFAULT variable to support per-package overrides with Clang Currently, LTO variable is set with a toolchain-clang override directly. This causes priority issues where package-specific overrides (e.g., LTO:pn-perl = "") are ignored when the Clang toolchain is active, making it difficult to disable LTO for specific failing recipes. This patch refactors the logic by introducing an intermediate `LTO_DEFAULT` variable. - `LTO_DEFAULT` handles the toolchain-specific flags (GCC vs Clang). - `LTO` is assigned `LTO_DEFAULT` as a default value. This structure allows `LTO` to be cleanly overridden by recipe-specific overrides (like `pn-${PN}`) regardless of the active toolchain. Added a toolchain-gcc override for alsa-lib because -flto-partition=none is not supported by Clang. Signed-off-by: mark.yang Signed-off-by: Mathieu Dubois-Briand Signed-off-by: Ross Burton Signed-off-by: Richard Purdie --- meta/conf/distro/include/lto.inc | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/meta/conf/distro/include/lto.inc b/meta/conf/distro/include/lto.inc index 227f0c5c2a..8752249685 100644 --- a/meta/conf/distro/include/lto.inc +++ b/meta/conf/distro/include/lto.inc @@ -28,7 +28,7 @@ LTO:pn-grub-efi = "" # Custom LTO flags # disable partitioning/streaming algorithm since its uses ASM # constructs not compatible with lto -LTOEXTRA:pn-alsa-lib = "-flto-partition=none" +LTOEXTRA:pn-alsa-lib:toolchain-gcc = "-flto-partition=none" LTOEXTRA ?= "" @@ -43,9 +43,11 @@ LTOEXTRA ?= "" # -fuse-linker-plugin # ensures that libraries participate in LTO by supplying intermediate # code from .a files to linker -LTO ?= "-flto -ffat-lto-objects -fuse-linker-plugin ${LTOEXTRA}" +LTO_DEFAULT = "-flto -ffat-lto-objects -fuse-linker-plugin ${LTOEXTRA}" -LTO:toolchain-clang = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin ${LTOEXTRA}', '-flto ${LTOEXTRA}', d)}" +LTO_DEFAULT:toolchain-clang = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin ${LTOEXTRA}', '-flto ${LTOEXTRA}', d)}" + +LTO ?= "${LTO_DEFAULT}" 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