[PATCH v2] drm/i915: Disable some extra clang warnings

[Matthias Kaehlcke]

Commit 39bf4de89ff7 ("drm/i915: Add -Wall -Wextra to our build, set
warnings to full") enabled extra warnings for i915 to spot possible
bugs in new code, and then disabled a subset of these warnings to keep
the current code building without warnings (with gcc). Enabling the
extra warnings also enabled some additional clang-only warnings, as a
result building i915 with clang currently is extremely noisy. For now
also disable the clang warnings sign-compare, sometimes-uninitialized,
unneeded-internal-declaration and initializer-overrides. If desired
they can be re-enabled after the code has been fixed.

Fixes: 39bf4de89ff7 ("drm/i915: Add -Wall -Wextra to our build, set
warnings to full")
Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
---
Changes in v2:
- rebased on drm-tip
- added comment indicating that disabled warnings are clang warnings

 drivers/gpu/drm/i915/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 4eee91a3a236..9717c037b582 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -18,6 +18,11 @@ subdir-ccflags-y += $(call cc-disable-warning, type-limits)
 subdir-ccflags-y += $(call cc-disable-warning, missing-field-initializers)
 subdir-ccflags-y += $(call cc-disable-warning, implicit-fallthrough)
 subdir-ccflags-y += $(call cc-disable-warning, unused-but-set-variable)
+# clang warnings
+subdir-ccflags-y += $(call cc-disable-warning, sign-compare)
+subdir-ccflags-y += $(call cc-disable-warning, sometimes-uninitialized)
+subdir-ccflags-y += $(call cc-disable-warning, unneeded-internal-declaration)
+subdir-ccflags-y += $(call cc-disable-warning, initializer-overrides)
 subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
 
 # Fine grained warnings disable
-- 
2.16.2.804.g6dcf76e118-goog