Author tim.peters
Recipients davin, jeff.allen, mark.dickinson, rhettinger, serhiy.storchaka, skrah, tim.peters
Date 2017-11-20.03:56:19
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Best I can tell, the fdlibm 5.3 on netlib was released in 2002, and essentially stopped existing as a maintained project then.  Everyone else copied the source code, and made their own changes independently ever since :-(  At least the folks behind the Julia language have made some effort to resurrect it as its own project:

Mark noted that GCC does use a different math library for tan() calls it can evaluate at compile-time.  That appears to have started in gcc 4.3:

In any case ... are there are any test failures here on a _current_ OS/platform?  If it's only on out-of-date platforms, I'd be content to just suppress the failures on those.  Unless the number of affected systems is so large that their identifiers won't fit in a file ;-)
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