configure.in: check atan2

* configure.in (rb_cv_atan2_inf_c99): check whether runtime atan2
  handles Inf as C99.  ruby-core:62536] [Bug #9831]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45930 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 2 deletions

diff --git a/math.c b/math.c
index 8911de1360..78cba5ab0c 100644
--- a/math.c
+++ b/math.c
@@ -79,8 +79,7 @@ math_atan2(VALUE obj, VALUE y, VALUE x)
 	    return DBL2NUM(M_PI);
 	return DBL2NUM(-M_PI);
     }
-#if !(defined(HAVE_ATAN2L) && defined(HAVE_ATAN2F))
-    /* assume atan2() doesn't handle Inf as C99 */
+#ifndef ATAN2_INF_C99
     if (isinf(dx) && isinf(dy)) {
 	/* optimization for FLONUM */
 	if (dx < 0.0) {