On Mon, Feb 11, 2019 at 11:30:06AM -0800, ndesaulniers@xxxxxxxxxx wrote: > 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. The Changelog is utterly failing to explain what it does. > Link: https://github.com/ClangBuiltLinux/linux/issues/343 That is irrelevant crap. > Suggested-by: Rui Ueyama <ruiu@xxxxxxxxxx> > Suggested-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Tested-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > --- > 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 >
