Re: [PATCH 13/22] scripts/mod: disable LTO for empty.c

Nick Desaulniers
2020-06-24T20:57:25Z

On Wed, Jun 24, 2020 at 1:33 PM Sami Tolvanen <samitolvanen@google.com> wrote:
>
> With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object
> files. As empty.o is used for probing target properties, disable LTO
> for it to produce an object file instead.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
> scripts/mod/Makefile | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
> index 296b6a3878b2..b6e3b40c6eeb 100644
> --- a/scripts/mod/Makefile
> +++ b/scripts/mod/Makefile
> @@ -1,5 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
> OBJECT_FILES_NON_STANDARD := y
> +CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO)
>
> hostprogs := modpost mk_elfconfig
> always-y := $(hostprogs) empty.o
> --
> 2.27.0.212.ge8ba1cc988-goog
>

--
Thanks,
~Nick Desaulniers