[issue33015] Fix function cast warning in thread_pthread.h

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Right, so one PR is a real fix, the other PR is a workaround (avoids the warning without fixing the underlying problem).

The underlying problem is: if a platform has incompatible ABIs for the two function types, casting one function type to another may produce bugs (memory corruptions, crashes, etc).  We can however decide to consider those platforms unlikely, as the current code has been working for years or decades.

It would be nice to have an opinion from C specialists.

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nosy: +gregory.p.smith, skrah

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