[Intel-gfx] [PATCH 1/2] drm/i915: Disable -Woverride-init

[Chris Wilson]

Quoting Ville Syrjälä (2017-10-13 17:47:25)
> On Fri, Oct 13, 2017 at 05:08:29PM +0100, Chris Wilson wrote:
> > We commonly use an inheritance style approach to device parameters,
> > where later generations inherit the defaults from earlier generations
> > and then override settings that change. For example, in i915_pci.c
> > BDW_FEATURES pulls in HSW_FEATURES, makes a few changes for 48bit
> > contexts and then individual Broadwell stanzas make further adjustments
> > for different GT configs.
> > 
> > This causes a lot of warnings with make W=1 from -Woverride-init. We
> > could use
> >       #pragma GCC diagnostic push
> >       #pragma GCC diagnostic ignored "-Woverride-init"
> >       ...
> >       #pragma GCC diagnostic pop
> > around the offenders, but the pattern is used frequently enough in the
> > driver to prefer just disabling the warning entirely.
> > 
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com
> > Cc: Jani Nikula <jani.nikula at intel.com>
> > Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> > Cc: Tomi Sarvela <tomi.p.sarvela at intel.com>
> > ---
> >  drivers/gpu/drm/i915/Makefile | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> > index 66d23b619db1..0bb6e423ecd7 100644
> > --- a/drivers/gpu/drm/i915/Makefile
> > +++ b/drivers/gpu/drm/i915/Makefile
> > @@ -2,7 +2,8 @@
> >  # Makefile for the drm device driver.  This driver provides support for the
> >  # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
> >  
> > -subdir-ccflags-$(CONFIG_DRM_I915_WERROR) := -Werror
> > +subdir-ccflags-y := -Wno-override-init # used frequently for "inheritance"
> 
> This doesn't seem to override what W=n does so not sure why we'd need it
> here, unless we add more warning flags ourselves. Or does you gcc spew
> these without W=1?

It's for the majority of the noise in W=1.
-Chris