[PATCH v2 2/2] amdgpu/dc/dml: Support clang option for stack alignment

[Matthias Kaehlcke]

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 at chromium.org>
Signed-off-by: Matthias Kaehlcke <mka at chromium.org>
---
Changes in v2:
- use consistent syntax and formatting for assignment of cc_stack_align

 drivers/gpu/drm/amd/display/dc/dml/Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index b8cadf833e71..a92189eddab0 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -24,7 +24,13 @@
 # It provides the general basic services required by other DAL
 # subcomponents.
 
-subdir-ccflags-y += -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
+
+subdir-ccflags-y += -mhard-float -msse $(cc_stack_align)
 
 DML = display_mode_lib.o display_rq_dlg_calc.o \
 	  display_rq_dlg_helpers.o dml1_display_rq_dlg_calc.o \
-- 
2.16.0.rc1.238.g530d649a79-goog