Bug#1003348: gtk4: Background blend mode clip interaction not working as intended on mips*el

[Simon McVittie]

Control: reassign -1 src:mesa
Control: affects -1 + src:gtk4

On Sat, 08 Jan 2022 at 18:35:20 +0000, Simon McVittie wrote:
> Similar to #993550, GTK 4 has a new test failure on mips*el.
> Please see https://gitlab.gnome.org/GNOME/gtk/-/issues/4618 for details.

This seems likely to be a mips*-specific bug in Mesa's llvmpipe or some
dependency of llvmpipe (maybe LLVM?), rather than directly a GTK bug: I
can avoid the test failure by running tests with GALLIUM_DRIVER=softpipe
and LIBGL_ALWAYS_SOFTWARE=true in the environment.

I've set up the GTK build to use GALLIUM_DRIVER=softpipe and
LIBGL_ALWAYS_SOFTWARE=true for build-time tests, and I don't intend to
investigate this further from GTK's point of view. Investigation by the
mips porting team would be appreciated.

    smcv