fix acosh for vs2012 and earlier

diff --git a/ext/standard/math.c b/ext/standard/math.c
index 665822c0354b5d10e03f52f26ca3a24c4fbf31ee..c957ca4698717fcf352e3ba5ccf4a89e9f015759 100644 (file)
--- a/ext/standard/math.c
+++ b/ext/standard/math.c
@@ -240,7 +240,15 @@ static double php_acosh(double x)
 #ifdef HAVE_ACOSH
        return(acosh(x));
 #else
+# ifdef _WIN64
+       if (x >= 1) {
+               return log(x + sqrt(x * x - 1));
+       } else {
+               return (DBL_MAX+DBL_MAX)-(DBL_MAX+DBL_MAX);
+       }
+# else
        return(log(x + sqrt(x * x - 1)));
+# endif
 #endif
 }
 /* }}} */