From: robertl <robertl@f51c46e8-681c-474f-0cfe-069cfd0219fb>
Date: Fri, 5 May 2006 14:32:48 +0000 (+0000)
Subject: Make use of isnan optional since it's C99.
X-Git-Tag: archive/raspbian/1.10.0+ds-2+rpi1~1^2~12^2~11^2~2883
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=f661d4995e22f0379d4e05d1bc8f115ad8733cb5;p=gpsbabel.git

Make use of isnan optional since it's C99.
---

diff --git a/gpsbabel/grtcirc.c b/gpsbabel/grtcirc.c
index 752e3f229..2bb40b0b2 100644
--- a/gpsbabel/grtcirc.c
+++ b/gpsbabel/grtcirc.c
@@ -68,7 +68,12 @@ double gcdist( double lat1, double lon1, double lat2, double lon2 ) {
 
   res = acos(res);
 
-  if ((isnan(res)) || (errno == EDOM)) { /* this should never happen: */
+  if (
+#if defined isnan
+	  /* This is a C99-ism. */
+	  (isnan(res)) || 
+#endif 
+	  (errno == EDOM)) { /* this should never happen: */
     errno = 0;                           /* Math argument out of domain of function, */
     return 0;                            /* or value returned is not a number */
   }