more cancellation work

[Ulrich Drepper]

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David Mosberger wrote:

> Huh?  What "legal problems" does libunwind have?  Care to elaborate?

gdb apparently still cannot use libunwind.

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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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