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Subject[PATCH v3 4/4] amdgpu/dc/calcs: Support clang option for stack alignment
calcs 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.

Signed-off-by: Matthias Kaehlcke <>
Changes in v3:
- patch added

Note to self: if this patterns proliferates further we probably want to
put the evaluation of the correct compiler flag in some common place.

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

diff --git a/drivers/gpu/drm/amd/display/dc/calcs/Makefile b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
index af0f452f3c9f..95f332ee3e7e 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
@@ -24,7 +24,13 @@
# It calculates Bandwidth and Watermarks values for HW programming

-calcs_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
+calcs_ccflags := -mhard-float -msse $(cc_stack_align)

CFLAGS_dcn_calcs.o := $(calcs_ccflags)
CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
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