[issue23545] Turn on extra warnings on GCC

[Martin Panter]

Martin Panter added the comment:

I didn’t look too closely, but I did see that _ssl_locks_count is unsigned int. I was compiling for x86-64 Linux, where int is 32 bits and size_t is 64. So maybe GCC was optimizing the (size_t) cast away, and then rightfully warning that the largest unsigned int will never exceed the largest possible array size.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23545>
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