[issue4204] Cannot build _multiprocessing, math, mmap and readline of Python 2.6 on FreeBSD 4.11 w/ gcc 2.95.4

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

The test_math failure may well be due to a libm bug:  tanh(-0.0)
might be incorrectly (judging by the BSD man pages) dropping the negative 
sign from the negative zero.

In the output of ./configure, there should be a line that looks like:

checking whether tanh preserves the sign of zero... yes

I'm guessing that on your machine you get a "no" instead of a "yes"
there, indicating that tanh(-0.0) is 0.0 instead of -0.0 on your
platform.  Is this the case?

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nosy: +marketdickinson

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