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math.c: fix tgamma on mingw

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* math.c (mingw_tgamma): tgamma(3) on mingw returns a NaN for a
  big number, not infinity.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-03-10 04:53:46 +00:00
parent c5c5e96643
commit 3f6fb5f72a
1 changed files with 10 additions and 0 deletions
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10
math.c
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@ -786,6 +786,16 @@ math_erfc(VALUE obj, VALUE x)
return DBL2NUM(erfc(Get_Double(x)));
}
#ifdef __MINGW32__
static inline double
mingw_tgamma(const double d)
{
const double g = tgamma(d);
return (isnan(g) && !signbit(d)) ? INFINITY : g;
}
#define tgamma(d) mingw_tgamma(d)
#endif
/*
* call-seq:
* Math.gamma(x) -> Float