Check for __cxa_thread_atexit for freebsd crosses

	PR libstdc++/78968
	* crossconfig.m4: Check for __cxa_thread_atexit on *-*-freebsd*.
	* configure: Regenerate.

From-SVN: r244169

libstdc++-v3/ChangeLog

+2017-01-06  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/78968
+	* crossconfig.m4: Check for __cxa_thread_atexit on *-*-freebsd*.
+	* configure: Regenerate.
+
 2017-01-06  Barrett Adair  <barrettellisadair@gmail.com>
 	    Jonathan Wakely  <jwakely@redhat.com>
 

libstdc++-v3/configure

@@ -53265,6 +53265,17 @@ $as_echo "$ac_ld_relro" >&6; }
       $as_echo "#define HAVE_ISNANL 1" >>confdefs.h
 
     fi
+    for ac_func in __cxa_thread_atexit
+do :
+  ac_fn_c_check_func "$LINENO" "__cxa_thread_atexit" "ac_cv_func___cxa_thread_atexit"
+if test "x$ac_cv_func___cxa_thread_atexit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE___CXA_THREAD_ATEXIT 1
+_ACEOF
+
+fi
+done
+
     ;;
   *-hpux*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'

libstdc++-v3/crossconfig.m4

@@ -132,6 +132,7 @@ case "${host}" in
       AC_DEFINE(HAVE_ISINFL)
       AC_DEFINE(HAVE_ISNANL)
     fi
+    AC_CHECK_FUNCS(__cxa_thread_atexit)
     ;;
   *-hpux*)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'