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

[Anthony Benware <hyperkvmx86@xxxxxxxxx>]

[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@xxxxxxxxx>

---
 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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