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[v3,3/4] amdgpu/dc/dml: Support clang option for stack alignment

Message ID 20180208205316.93330-3-mka@chromium.org (mailing list archive)
State New, archived
Headers show

Commit Message

Matthias Kaehlcke Feb. 8, 2018, 8:53 p.m. UTC 
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>
---
Changes in v3:
- adapted use of variable instead of subdir-ccflags-y

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

diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index 96b337a03172..782886cac61c 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.
 
-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)