From: Khem Raj <raj.khem@gmail.com>
Date: Mon, 9 Nov 2020 00:02:09 +0000 (-0800)
Subject: lto.inc: Add -ffat-lto-objects and -fuse-linker-plugin
X-Git-Tag: uninative-2.10~753
X-Git-Url: https://code.ossystems.io/gitweb?a=commitdiff_plain;h=770c69c51f87223eee7bd968fd28a5dc15a955d6;p=openembedded-core.git

lto.inc: Add -ffat-lto-objects and -fuse-linker-plugin

This helps to improve LTO and ensure the libs can be linked with non-LTO
objects too

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---

diff --git a/meta/conf/distro/include/lto.inc b/meta/conf/distro/include/lto.inc
index fe0f6c9f44..d7fea26c64 100644
--- a/meta/conf/distro/include/lto.inc
+++ b/meta/conf/distro/include/lto.inc
@@ -20,7 +20,16 @@ LTO_pn-libbsd = ""
 
 # Override it for additional or different options if needed e.g.
 # with clang thin-lto might be better for compile speed
-LTO ?= "-flto"
+#
+# ffat-lto-objects
+# object files that contain both the intermediate
+# language and the object code. This makes them
+# usable for both LTO linking and normal linking
+#
+# -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 "
 
 SELECTED_OPTIMIZATION_append = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}"
 TARGET_LDFLAGS_append_class-target = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}"