copy of the solaris isnan hack from configure.ac

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@866 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/acinclude.m4 b/acinclude.m4
index 936739577c05fdafaa20a1d7928c0655bfc48733..a4c7d2284c6491fae84be0c368fd36b45f3820a0 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -362,6 +362,12 @@ AC_CACHE_VAL([rd_cv_ieee_$2],
 #  define isinf(a) (fpclass(a) == FP_NINF || fpclass(a) == FP_PINF)
 #endif
 
+/* solaris 10 it defines isnan such that only forte can compile it ... bad bad  */
+#if (defined(HAVE_ISNAN) && defined(isnan) && defined(HAVE_FPCLASS))
+#  undef isnan
+#  define isnan(a) (fpclass(a) == FP_SNAN || fpclass(a) == FP_QNAN)
+#endif
+
 /* Digital UNIX */
 #if (! defined(HAVE_ISINF) && defined(HAVE_FP_CLASS) && defined(HAVE_FP_CLASS_H))
 #  define HAVE_ISINF 1