[issue26121] Use C99 functions in math if available

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Tests are failed only on s390x RHEL 3.x.

http://buildbot.python.org/all/builders/s390x%20RHEL%203.x/builds/446/steps/test/logs/stdio
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FAIL: test_mtestfile (test.test_math.MathTests)
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Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z/build/Lib/test/test_math.py", line 1287, in test_mtestfile
    '\n  '.join(failures))
AssertionError: Failures in test_mtestfile:
  gam0003: gamma(-inf): expected 'ValueError', got nan (not equal)
  gam0045: gamma(1e-160): expected 1e+160, got 1.0000000000000063e+160 (error = 6.24e+145 (40 ulps); permitted error = 0 or 20 ulps)
  gam0046: gamma(1e-308): expected 1e+308, got 1.0000000000000136e+308 (error = 1.36e+294 (68 ulps); permitted error = 0 or 20 ulps)
  gam0047: gamma(5.6e-309): expected 1.7857142857142848e+308, got 1.785714285714199e+308 (error = 8.58e+294 (430 ulps); permitted error = 0 or 20 ulps)
  gam0065: gamma(-1e-160): expected -1e+160, got -1.0000000000000063e+160 (error = 6.24e+145 (40 ulps); permitted error = 0 or 20 ulps)
  gam0066: gamma(-1e-308): expected -1e+308, got -1.0000000000000136e+308 (error = 1.36e+294 (68 ulps); permitted error = 0 or 20 ulps)
  gam0067: gamma(-5.6e-309): expected -1.7857142857142848e+308, got -1.785714285714199e+308 (error = 8.58e+294 (430 ulps); permitted error = 0 or 20 ulps)
  gam0081: gamma(-1.0000000000000002): expected 4503599627370495.5, got 4503599627370484.5 (error = 11 (22 ulps); permitted error = 0 or 20 ulps)
  gam0084: gamma(-100.00000000000001): expected -7.540083334883109e-145, got -7.540083334882688e-145 (error = 4.21e-158 (296 ulps); permitted error = 0 or 20 ulps)
  gam0085: gamma(-99.99999999999999): expected 7.540083334884096e-145, got 7.540083334884402e-145 (error = 3.06e-158 (215 ulps); permitted error = 0 or 20 ulps)
  gam0100: gamma(170.0): expected 4.269068009004705e+304, got 4.269068009005011e+304 (error = 3.06e+291 (628 ulps); permitted error = 0 or 20 ulps)
  gam0101: gamma(171.0): expected 7.257415615307999e+306, got 7.257415615308882e+306 (error = 8.83e+293 (708 ulps); permitted error = 0 or 20 ulps)
  gam0102: gamma(171.624): expected 1.7942117599248104e+308, got 1.794211759924979e+308 (error = 1.69e+295 (845 ulps); permitted error = 0 or 20 ulps)
  gam0120: gamma(-100.5): expected -3.3536908198076787e-159, got -3.353690819807666e-159 (error = 1.26e-173 (25 ulps); permitted error = 0 or 20 ulps)
  gam0121: gamma(-160.5): expected -5.255546447007829e-286, got -5.255546447008121e-286 (error = 2.92e-299 (313 ulps); permitted error = 0 or 20 ulps)
  gam0122: gamma(-170.5): expected -3.3127395215386074e-308, got -3.312739521538679e-308 (error = 7.16e-322 (145 ulps); permitted error = 0 or 20 ulps)
  gam0140: gamma(-63.349078729022985): expected 4.177797167776188e-88, got 4.177797167776136e-88 (error = 5.19e-102 (93 ulps); permitted error = 0 or 20 ulps)
  gam0141: gamma(-127.45117632943295): expected 1.183111089623681e-214, got 1.183111089623727e-214 (error = 4.6e-228 (223 ulps); permitted error = 0 or 20 ulps)

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nosy: +zach.ware

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<http://bugs.python.org/issue26121>
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