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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 <mka@chromium.org>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Matthias Kaehlcke 2018-02-08 12:53:16 -08:00 committed by Alex Deucher
parent 4769278e5c
commit cc32ad8f55
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/amd/display/dc/calcs/Makefile
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@ -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
endif
calcs_ccflags := -mhard-float -msse $(cc_stack_align)
CFLAGS_dcn_calcs.o := $(calcs_ccflags)
CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)