[PATCH 2/5] drm/xe: place header test files in .hdrtest subdirectories

[Jani Nikula <jani.nikula@intel.com>]

The header tests track whether headers have been checked using empty
*.hdrtest files in the build tree. This pollutes the build directories,
as the files live in the same "name space" as the real output files,
messing with TAB completion among other things.

Hide the disgusting turds by placing them in .hdrtest subdirectories.

Change the quiet command output to simply $< instead of trying to decode
roughly the same from the increasingly complicated $@.

Note that it would be somewhat nicer to have the basename of the
.hdrtest files be dot-prefixed instead of using subdirectories. However,
it's challenging to come up with a pattern rule for that, as we can list
headers to test in the subdirectories of $(src) too, without requiring
Makefiles and kbuild to descend to each of them.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Closes: https://lore.kernel.org/r/CAHk-=wjMrqzuUmH-mFbR_46EWEFS=bB=J7h9ABMVy56Vi81PKQ@mail.gmail.com
Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

---

Cc: linux-kbuild@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: intel-xe@lists.freedesktop.org
Cc: intel-gfx@lists.freedesktop.org
---
 drivers/gpu/drm/xe/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 9699b08585f7..2029c3b5aa5c 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -327,12 +327,12 @@ ifneq ($(CONFIG_DRM_XE_DISPLAY),y)
 endif
 
 always-$(CONFIG_DRM_XE_WERROR) += \
-	$(patsubst %.h,%.hdrtest, $(shell cd $(src) && find * -name '*.h' $(hdrtest_find_args)))
+	$(patsubst %.h,.hdrtest/%.hdrtest, $(shell cd $(src) && find * -name '*.h' $(hdrtest_find_args)))
 
-quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
+quiet_cmd_hdrtest = HDRTEST $<
       cmd_hdrtest = $(CC) -DHDRTEST $(filter-out $(CFLAGS_GCOV), $(c_flags)) -S -o /dev/null -x c /dev/null -include $<; touch $@
 
-$(obj)/%.hdrtest: $(src)/%.h FORCE
+$(obj)/.hdrtest/%.hdrtest: $(src)/%.h FORCE
 	$(call if_changed_dep,hdrtest)
 
 uses_generated_oob := $(addprefix $(obj)/, $(xe-y))
-- 
2.39.5