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SubjectRe: [PATCH 3/4] Makefile: lld: tell clang to use lld
On Thu, Feb 7, 2019 at 9:51 PM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> On Thu, Feb 07, 2019 at 02:01:51PM -0800, ndesaulniers@google.com wrote:
> > This is needed because clang doesn't select which linker to use based on
> > $LD but rather -fuse-ld=$(LD). This is problematic especially for
> > cc-ldoption, which checks for linker flag support via invoking the
> > compiler, rather than the linker.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/342
> > Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
> > Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> > ---
> > Makefile | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/Makefile b/Makefile
> > index 0eae4277206e..6307c17259ea 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -502,6 +502,9 @@ endif
> > CLANG_FLAGS += -no-integrated-as
> > KBUILD_CFLAGS += $(CLANG_FLAGS)
> > KBUILD_AFLAGS += $(CLANG_FLAGS)
> > +ifneq ($(shell $(LD) --version 2>&1 | head -n 1 | grep LLD),)
> > +CLANG_FLAGS += -fuse-ld=lld
> > +endif
>
> This section needs to be moved up above KBUILD_CFLAGS otherwise it never
> actually gets passed along.

Great catch! I had that correct in my Pixel kernel patches; messed
that up forward porting them. Included in v2 (sending imminently).

--
Thanks,
~Nick Desaulniers

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