Quoting Jani Nikula (2019-03-21 09:50:25)
> On Wed, 20 Mar 2019, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> > gcc-4.8 and older dislike the use of __builtin_constant_p() within a
> > constant expression context, and so we must use the magical
> > __is_constexpr() instead.
> >
> > For example, with gcc-4.8.5:
> > ../drivers/gpu/drm/i915/i915_reg.h:167:27: error: first argument to ‘__builtin_choose_expr’ not a constant
> > ../include/linux/build_bug.h:16:45: error: bit-field ‘<anonymous>’ width not an integer constant
> >
> > Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
> > Fixes: baa09e7d2f42 ("drm/i915: use REG_FIELD_PREP() to define register bitfield values")
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> > Cc: Imre Deak <imre.deak@xxxxxxxxx>
> > Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
>
> Thanks, Uma reported this too and confirmed __is_constexpr works.
>
> Reported-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
And pushed for a quieter tomorrow. Thanks everyone for reporting!
-Chris
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