From: Matthias Kaehlcke <mka@chromium.org>
Date: Thu, 8 Feb 2018 12:53:15 -0800
Subject: amdgpu/dc/dml: Support clang option for stack alignment
Git-commit: 4769278e5c7fd2be445e4a34f834d40475fcb0ce
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

DML uses the compiler option -mpreferred-stack-boundary=4 to configure
a stack alignment of 16 bytes. Clang uses the option -mstack-alignment
instead, which expects as parameter the alignment in bytes, and not a
power of two like -mpreferred-stack-boundary.

Probe for both compiler options and use the correct one, similar to
what is done in arch/x86/Makefile.

Reported-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/dml/Makefile |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -3,7 +3,13 @@
 # It provides the general basic services required by other DAL
 # subcomponents.
 
-dml_ccflags := -mhard-float -msse -mpreferred-stack-boundary=4
+ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
+	cc_stack_align := -mpreferred-stack-boundary=4
+else ifneq ($(call cc-option, -mstack-alignment=16),)
+	cc_stack_align := -mstack-alignment=16
+endif
+
+dml_ccflags := -mhard-float -msse $(cc_stack_align)
 
 CFLAGS_display_mode_vba.o := $(dml_ccflags)
 CFLAGS_display_mode_lib.o := $(dml_ccflags)