[Intel-gfx] [PATCH] drm/i915: fix header test with GCOV

[Jani Nikula]

$(CC) with $(CFLAGS_GCOV) assumes the output filename with .gcno suffix
appended is writable. This is not the case when the output filename is
/dev/null:

  HDRTEST drivers/gpu/drm/i915/display/intel_frontbuffer.h
/dev/null:1:0: error: cannot open /dev/null.gcno
  HDRTEST drivers/gpu/drm/i915/display/intel_ddi.h
/dev/null:1:0: error: cannot open /dev/null.gcno
make[5]: *** [../drivers/gpu/drm/i915/Makefile:307:
drivers/gpu/drm/i915/display/intel_ddi.hdrtest] Error 1
make[5]: *** Waiting for unfinished jobs....
make[5]: *** [../drivers/gpu/drm/i915/Makefile:307:
drivers/gpu/drm/i915/display/intel_frontbuffer.hdrtest] Error 1

Filter out $(CFLAGS_GVOC) from the header test $(c_flags) as they don't
make sense here anyway.

References: http://lore.kernel.org/r/d8112767-4089-4c58-d7d3-2ce03139858a@infradead.org
Reported-by: Randy Dunlap <rdunlap at infradead.org>
Fixes: c6d4a099a240 ("drm/i915: reimplement header test feature")
Cc: Masahiro Yamada <masahiroy at kernel.org>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index b314d44ded5e..bc28c31c4f78 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -301,7 +301,7 @@ extra-$(CONFIG_DRM_I915_WERROR) += \
 		$(shell cd $(srctree)/$(src) && find * -name '*.h')))
 
 quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
-      cmd_hdrtest = $(CC) $(c_flags) -S -o /dev/null -x c /dev/null -include $<; touch $@
+      cmd_hdrtest = $(CC) $(filter-out $(CFLAGS_GCOV), $(c_flags)) -S -o /dev/null -x c /dev/null -include $<; touch $@
 
 $(obj)/%.hdrtest: $(src)/%.h FORCE
 	$(call if_changed_dep,hdrtest)
-- 
2.20.1