I filed the following bug report last year, which details at least one
possible reason for this behaviour: selector types are encoded
differently between gcc 3 and 4, and between objc++ and objc. This bug
report ( rdar://4301047 ) was closed without any comment.
I've since deleted the test project mentioned in the report, but it's
extremely easy to reproduce: simply build a class with a non-trivial
selector, then print the selectors signature; compile with both gcc
3.3 and 4.0.1, and compare.
I did see that radar, but I think it's unrelated. I would expect
runtime issues due to that bug, not the compiler crashing.
Trying my original sample code with gcc 4.0.1, I cannot reproduce the
crashing issue. The code doesn't compile properly, of course,
because it's not actually valid, but it fails as you'd expect, with
appropriate error messages.
So, I guess my specific issue was fixed at some point. Thus, I'd
recommend again that the original poster submit a bug report.
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