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Subject[PATCH v2 4/4] Makefile: lld: set -O2 linker flag when linking with LLD
From
For arm64:
0.34% size improvement with lld -O2 over lld for vmlinux.
3.3% size improvement with lld -O2 over lld for Image.lz4-dtb.

Link: https://github.com/ClangBuiltLinux/linux/issues/343
Suggested-by: Rui Ueyama <ruiu@google.com>
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
Changes V1->V2:
* add tested and reviewed by tags.

Makefile | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index 00e8e01d23fc..8011555745aa 100644
--- a/Makefile
+++ b/Makefile
@@ -718,6 +718,10 @@ else
KBUILD_CFLAGS += -Wno-unused-but-set-variable
endif

+ifdef CONFIG_LD_IS_LLD
+KBUILD_LDFLAGS += -O2
+endif
+
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
ifdef CONFIG_FRAME_POINTER
KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
--
2.20.1.791.gb4d0f1c61a-goog
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