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FROMLIST: BACKPORT: Makefile: lld: set -O2 linker flag when linking w…
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…ith LLD

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: ClangBuiltLinux/linux#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: Eliminater74 <eliminater74@gmail.com>
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nickdesaulniers authored and Eliminater74 committed Feb 22, 2019
1 parent 55e26e4 commit 151761c
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Original file line number Diff line number Diff line change
Expand Up @@ -709,6 +709,7 @@ endif
ifeq ($(cc-name),clang)
ifeq ($(ld-name),lld)
KBUILD_CFLAGS += -fuse-ld=lld
KBUILD_LDFLAGS += -O2
endif
endif

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