From: Matthias Kaehlcke <mka@chromium.org>
Date: Tue, 1 May 2018 11:24:40 -0700
Subject: drm/i915: Disable some extra clang warnings
Git-commit: 46e2068081e96472b1d7d2456fa0655aa148b32b
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

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.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180501182440.70121-1-mka@chromium.org

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/Makefile |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -17,6 +17,10 @@ subdir-ccflags-y += $(call cc-disable-wa
 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 += $(call cc-disable-warning, initializer-overrides)
 subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
 
 # Fine grained warnings disable