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This is necessary to make the tests pass on 64-bit PowerPC. This is
caused because the MetaEnumVariable class does not register its
comparators, which is required in Qt 5.
Qt 6 will use introspection to automatically do this. The proper fix is
likely to use a constructor function somewhere in the Grantlee library
to ensure it is called on library initialisation, but it isn't
immediately obvious to me where to put such a ctor.
This only seems to affect 64-bit PowerPC, as other platforms do pass
this test; maybe Qt is doing some sort of introspection that doesn't
work on ppc64. It is also affected by GCC optimisation flags, so it may
be a miscompilation.
At any rate, this patch *does* fix the tests. Prior to 5.3.0, enums did
not compare correctly anyway, so this does not have a very high impact.
Fixes: #955
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