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The options appear to be undocumented for many targets. Their exact status
(compile-time or run-time options for the compiler) seems to be problematic too.
Presumably it should be -pthread (the more portable option) not -pthreads (the redundant, Solaris-only option).
It's currently only documented as valid for Solaris:
and RS/6000 & PowerPC:
It should also be listed at: