[PATCH] drm/amd/display: Fix dcn30_optc.o unknown argument with clang

[Alex Deucher]

On Mon, Sep 21, 2020 at 6:12 PM Anthony Benware <hyperkvmx86 at gmail.com> wrote:
>
> [Why]
> Clang can't compile dcn30_optc.o with '-mpreferred-stack-boundary=4'
>
> [How]
> use '-mstack-alignment=4' if Clang is CC and '-mpreferred-stack-boundary=4' if CC is not Clang
>
> Signed-off-by: Anthony Benware <hyperkvmx86 at gmail.com>

Thanks for the patch.  I just sent a slightly different one to fix
this up properly with clang and older versions of gcc.

Alex

> ---
>  drivers/gpu/drm/amd/display/dc/dcn30/Makefile | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/Makefile b/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
> index 025637a83c3b..fcded5498393 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dcn30/Makefile
> @@ -31,7 +31,11 @@ DCN30 = dcn30_init.o dcn30_hubbub.o dcn30_hubp.o dcn30_dpp.o dcn30_optc.o \
>         dcn30_dio_link_encoder.o dcn30_resource.o
>
>
> +ifdef CONFIG_CC_IS_CLANG
> +CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o := -mhard-float -msse -mstack-alignment=4
> +else
>  CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_optc.o := -mhard-float -msse -mpreferred-stack-boundary=4
> +endif
>
>  CFLAGS_$(AMDDALPATH)/dc/dcn30/dcn30_resource.o := -mhard-float -msse
>  ifdef CONFIG_CC_IS_GCC
> --
> 2.28.0
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