Check whether feenableexcept() exists before using it.

configure.ac

@@ -381,7 +381,7 @@ AX_PTHREAD([LIBS="$PTHREAD_LIBS $LIBS" CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 
 AC_CHECK_LIB(pthread, pthread_barrier_init,
 	     AC_DEFINE([HAVE_PTHREAD_BARRIERS], [1], [The posix library implements barriers]),
-	     AC_MSG_WARN(POSIX implementation does not have barriers. SWIFT will use home-made ones.))		
+	     AC_MSG_WARN(POSIX implementation does not have barriers. SWIFT will use home-made ones.))
 
 # Check for metis. Note AX_LIB_METIS exists, but cannot be configured
 # to be default off (i.e. given no option it tries to locate METIS), so we
@@ -551,6 +551,10 @@ if test "$with_hdf5" = "yes"; then
 fi
 AM_CONDITIONAL([HAVEPARALLELHDF5],[test "$have_parallel_hdf5" = "yes"])
 
+# Check for floating-point execeptions
+AC_CHECK_FUNC(feenableexcept, AC_DEFINE([HAVE_FE_ENABLE_EXCEPT],[1],
+    [Defined if the floating-point exception can be enabled using non-standard GNU functions.]))
+
 # Check for setaffinity.
 AC_CHECK_FUNC(pthread_setaffinity_np, AC_DEFINE([HAVE_SETAFFINITY],[1],
     [Defined if pthread_setaffinity_np exists.]) )

examples/main.c

@@ -203,7 +203,11 @@ int main(int argc, char *argv[]) {
         with_drift_all = 1;
         break;
       case 'e':
+#ifdef HAVE_FE_ENABLE_EXCEPT
         with_fp_exceptions = 1;
+#else
+        error("Need support for floating point exception on this platform");
+#endif
         break;
       case 'f':
         if (sscanf(optarg, "%llu", &cpufreq) != 1) {
@@ -379,7 +383,9 @@ int main(int argc, char *argv[]) {
 
   /* Do we choke on FP-exceptions ? */
   if (with_fp_exceptions) {
+#ifdef HAVE_FE_ENABLE_EXCEPT
     feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
+#endif
     if (myrank == 0)
       message("WARNING: Floating point exceptions will be reported.");
   }