Messages in this thread | | | Date | Tue, 12 Feb 2019 13:22:21 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 4/4] Makefile: lld: set -O2 linker flag when linking with LLD |
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On Mon, Feb 11, 2019 at 11:30:06AM -0800, ndesaulniers@google.com 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@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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