[Bug 3919] crash in _longjmp_unwind (siglongjmp)

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3919

--- Comment #1 from busybox-bugzilla at plan9.de  ---
there are a myriad of other checks (exit crashes the same way by a direct call
to 0x0). maybe the recently-applied patch for uClibc_main is wrong, too - GCC
should not optimize away weak function checks.

maybe there is a problem with declaring weak functions, so gcc thinks the
symbols are not weak and thus assumes they are always nonzero?

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