[bug #42717] Crash in -[NSBox(Private) calcSizesAllowingNegative:]

[Richard Frith-Macdonald]

Follow-up Comment #12, bug #42717 (project gnustep):

> both being caused by a compiler that crashes when calling
> a method on nil that returns a structure type

My understanding is that the behavior when calling a method expected to return
a struct on a nil receiver is (and has always been) undefined.
Certainly I know that it has always crashed on sparc machines.

So I think it's a bit harsh to refer to a change in the undefined behavior as
a new compiler bug .... I expect any code calling a method which returns a
struct ought to check that the receiver is non-null fist.

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