[bug #25033] compilation of gnustep-gui-0.14.0 fails on openbsd 4.4 sparc

[David Ayers]

Follow-up Comment #16, bug #25033 (project gnustep):

Actually my suggestion is not so great after all.  Merely haven
NXConstantString categories would still break the class hierarchy.

I'm not sure how gnustep's constant strings worked with compilers prior to
-fconstant-string-class.  I.e. how we can unsure the runtime will always use
our:
NXConstantString : NSString : NSObject

instead of libobjc's
NXConstantString : Object

Maybe we should try to "adjust" the runtime structures during +load of our
NXConstantString class.  I'm not sure exactly how to do that (especially
efficiently [i.e. without iterating of all known classes to find both versions
of NXConstantString for every GNUstep process]).

Maybe someone else has a better suggestion, or know more about how/whether
this worked with compilers prior to -fconstant-string-class.

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