lib/51798: libm failures spotted by py-scipy's testsuite

[coypu%sdf.org@localhost]

>Number:         51798
>Category:       lib
>Synopsis:       libm failures spotted by py-scipy's testsuite
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 08 11:55:00 +0000 2017
>Originator:     coypu
>Release:        NetBSD 7.99.54
>Organization:
>Environment:
NetBSD box 7.99.54 NetBSD 7.99.54 (GENERIC) #1: Mon Jan  2 13:38:36 IST 2017  fly@box:/usr/amd64/sys/arch/amd64/compile/GENERIC amd64

>Description:
Add to mk.conf:
  PKGSRC_FORTRAN=gfortran
  GFORTRAN_VERSION=6

(g95 has additional unrelated failures)

cd /usr/pkgsrc/math/py-scipy
bmake install test

======================================================================
FAIL: test_basic (test_signaltools.TestCSpline1DEval)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/pkg/pkg/lib/python2.7/site-packages/scipy/signal/tests/test_signaltools.py", line 598, in test_basic
    assert_array_almost_equal(y2[::10], y, decimal=5)
  File "/home/pkg/pkg/lib/python2.7/site-packages/numpy/testing/utils.py", line 918, in assert_array_almost_equal
    precision=decimal)
  File "/home/pkg/pkg/lib/python2.7/site-packages/numpy/testing/utils.py", line 739, in assert_array_compare
    raise AssertionError(msg)
AssertionError: 
Arrays are not almost equal to 5 decimals

(mismatch 11.1111111111%)
 x: array([ 0.99999,  2.     ,  3.     ,  4.     ,  3.     ,  2.     ,
        1.     ,  2.     ,  3.     ])
 y: array([ 1.,  2.,  3.,  4.,  3.,  2.,  1.,  2.,  3.])

======================================================================
FAIL: test_expm1_complex (test_basic.TestCephes)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/pkg/pkg/lib/python2.7/site-packages/numpy/testing/decorators.py", line 147, in skipper_func
    return f(*args, **kwargs)
  File "/home/pkg/pkg/lib/python2.7/site-packages/scipy/special/tests/test_basic.py", line 313, in test_expm1_complex
    assert_equal(expm1(complex(np.inf, 0)), complex(np.inf, 0))
  File "/home/pkg/pkg/lib/python2.7/site-packages/numpy/testing/utils.py", line 350, in assert_equal
    raise AssertionError(msg)
AssertionError: 
Items are not equal:
 ACTUAL: (nan+nan*j)
 DESIRED: (inf+0j)

======================================================================
FAIL: test_log1p_complex (test_basic.TestCephes)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/pkg/pkg/lib/python2.7/site-packages/numpy/testing/decorators.py", line 147, in skipper_func
    return f(*args, **kwargs)
  File "/home/pkg/pkg/lib/python2.7/site-packages/scipy/special/tests/test_basic.py", line 557, in test_log1p_complex
    assert_equal(log1p(c(np.inf, np.nan)), c(np.inf, np.nan))
  File "/home/pkg/pkg/lib/python2.7/site-packages/numpy/testing/utils.py", line 350, in assert_equal
    raise AssertionError(msg)
AssertionError: 
Items are not equal:
 ACTUAL: (nan+nan*j)
 DESIRED: (inf+nanj)

----------------------------------------------------------------------
Ran 24552 tests in 574.348s

FAILED (KNOWNFAIL=98, SKIP=2029, failures=3)

There are additional warnings during the test, too, but it's unclear if they are meaningful to us yet.
scipy issue: https://github.com/scipy/scipy/issues/6499
>How-To-Repeat:

>Fix: