Evolution-X-Devices/kernel_xiaomi_mt6785
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BACKPORT: FROMLIST: Makefile: lld: set -O2 linker flag when linking with LLD

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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.

(am from https://lkml.org/lkml/2019/2/11/1949)

Bug: 63740206
Change-Id: Ibdc7ecc9861562305b49456d6d37274ce8075e22
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>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Nick Desaulniers
2019-02-11 14:04:46 -08:00
committed by Sami Tolvanen
parent 10fa2703fb
commit 4a4ea24df2
1 changed files with 4 additions and 0 deletions
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4
Makefile
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@@ -755,6 +755,10 @@ else
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
endif
ifeq ($(ld-name),lld)
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