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configure.in: check lgamma_r(-0.0)

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* configure.in (rb_cv_lgamma_r_m0): check if lgamma_r(-0.0)
  returns negative infinity.  [Bug #12249]
* math.c (ruby_lgamma_r): define by the configured result.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54499 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2016-04-06 05:13:29 +00:00
parent 9d31efc6f0
commit ea736d55f9
3 changed files with 40 additions and 1 deletions
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2
math.c
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@ -750,7 +750,7 @@ ruby_tgamma(const double d)
#define tgamma(d) ruby_tgamma(d)
#endif
#if defined __APPLE__
#if defined LGAMMA_R_M0_FIX
static inline double
ruby_lgamma_r(const double d, int *sign)
{