[Bug libstdc++/54847] --enable-libstdcxx-time=yes non-functional on darwin

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54847

--- Comment #21 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-10-07 23:33:41 UTC ---
If you do that, the test may be "correct" but becomes much weaker, you cannot
really assume anymore the POSIX behavior for such functions. You only know that
the functions are available. I have no idea, for example, whether on non
strictly POSIX systems (on strictly POSIX systems the test passes as-is) other
functions may work better, provide more accurate time, etc. Jon may know
better.