src/collectd.h: Define a useable `NAN', based on `configure's findings.

diff --git a/src/collectd.h b/src/collectd.h
index c544bf5cbffa7623ee19a4d835817b6b6dbc59e1..7bf2f565a9e2024f1fe4b98187bd3451a22e3f42 100644 (file)
--- a/src/collectd.h
+++ b/src/collectd.h
@@ -100,19 +100,27 @@
 # define assert(...) /* nop */
 #endif
 
-/*
- * This weird macro cascade forces the glibc to define `NAN'. I don't know
- * another way to solve this, so more intelligent solutions are welcome. -octo
- */
-#ifndef __USE_ISOC99
-# define DISABLE__USE_ISOC99 1
-# define __USE_ISOC99 1
-#endif
-#include <math.h>
-#ifdef DISABLE__USE_ISOC99
-# undef DISABLE__USE_ISOC99
-# undef __USE_ISOC99
-#endif
+#if NAN_STATIC_DEFAULT
+# include <math.h>
+/* #endif NAN_STATIC_DEFAULT*/
+#elif NAN_STATIC_ISOC
+# ifndef __USE_ISOC99
+#  define DISABLE_ISOC99 1
+#  define __USE_ISOC99 1
+# endif /* !defined(__USE_ISOC99) */
+# include <math.h>
+# if DISABLE_ISOC99
+#  undef DISABLE_ISOC99
+#  undef __USE_ISOC99
+# endif /* DISABLE_ISOC99 */
+/* #endif NAN_STATIC_ISOC */
+#elif NAN_ZERO_ZERO
+# include <math.h>
+# define NAN (0.0 / 0.0)
+# ifndef isnan
+#  define isnan(f) ((f) != (f))
+# endif /* !defined(isnan) */
+#endif /* NAN_ZERO_ZERO */
 
 #if HAVE_DIRENT_H
 # include <dirent.h>
@@ -226,6 +234,4 @@
 extern char hostname_g[];
 extern int  interval_g;
 
-/* int main (int argc, char **argv); */
-
 #endif /* COLLECTD_H */