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lgamma_r.c: fix at -0.0

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* math.c (ruby_lgamma_r): missing/lgamma_r.c is used on Windows,
  since msvcrt does not provide it.
* missing/lgamma_r.c (lgamma_r): fix lgamma(-0.0).
  [ruby-core:74823] [Bug #12249]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54496 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2016-04-06 01:17:55 +00:00
parent bb7a4c2a00
commit 39330d6b79
3 changed files with 10 additions and 2 deletions
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2
missing/lgamma_r.c
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@ -66,7 +66,7 @@ lgamma_r(double x, int *signp)
double i, f, s;
f = modf(-x, &i);
if (f == 0.0) { /* pole error */
*signp = 1;
*signp = signbit(x) ? -1 : 1;
errno = ERANGE;
return HUGE_VAL;
}