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

[Matthias Kaehlcke <mka@chromium.org>]

On Mon, Mar 19, 2018 at 12:14:51PM -0700, Matthias Kaehlcke wrote:
> 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@chromium.org>
> ---
> 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

Ping, it seems this one swept under the radar

Thanks

Matthias