On Mon, Jul 29, 2019 at 9:04 AM Nathan Chancellor
<natechancellor@xxxxxxxxx> wrote:
>
> On Mon, Jul 29, 2019 at 06:15:17PM +0900, Masahiro Yamada wrote:
> > CLANG_FLAGS is initialized by the following line:
> >
> > CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
> >
> > ..., which is run only when CROSS_COMPILE is set.
> >
> > Some build targets (bindeb-pkg etc.) recurse to the top Makefile.
> >
> > When you build the kernel with Clang but without CROSS_COMPILE,
> > the same compiler flags such as -no-integrated-as are accumulated
> > into CLANG_FLAGS.
> >
> > If you run 'make CC=clang' and then 'make CC=clang bindeb-pkg',
> > Kbuild will recompile everything needlessly due to the build command
> > change.
> >
> > Fix this by correctly initializing CLANG_FLAGS.
> >
> > Fixes: 238bcbc4e07f ("kbuild: consolidate Clang compiler flags")
> > Cc: <stable@xxxxxxxxxxxxxxx> # v4.20+
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
>
> Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Acked-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
--
Thanks,
~Nick Desaulniers
