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My recent (uncommitted) changes to support a 64-bit __platform_wait_t for FreeBSD and Darwin revealed a problem in std::counting_semaphore. When the default template argument is used and __platform_wait_t is a 64-bit type, the numeric_limits<__platform_wait_t>::max() value doesn't fit in ptrdiff_t and so we get ptrdiff_t(-1), which fails a static_assert in the class body. The solution is to cap the value to PTRDIFF_MAX instead of allowing it to go negative. libstdc++-v3/ChangeLog: * include/bits/semaphore_base.h (__platform_semaphore::_S_max): Limit to PTRDIFF_MAX to avoid negative values. * testsuite/30_threads/semaphore/least_max_value.cc: New test. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
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