When checking for va_copy, use AC_LANG_SOURCE to shut up recent autoconf

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=19681
Reviewed-by: Colin Walters <walters@verbum.org>

diff --git a/configure.ac b/configure.ac
index e097718d277dfd80d584199c40d1cd4853d1f866..6df79fd60a9a3b14e93fcbfc8da0419e2ff20282 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -357,7 +357,7 @@ dnl **********************************
 dnl we currently check for all three va_copy possibilities, so we get
 dnl all results in config.log for bug reports.
 AC_CACHE_CHECK([for an implementation of va_copy()],dbus_cv_va_copy,[
-       AC_LINK_IFELSE([#include <stdarg.h>
+       AC_LINK_IFELSE([AC_LANG_SOURCE([#include <stdarg.h>
 #include <stdlib.h>
        static void f (int i, ...) {
        va_list args1, args2;
@@ -370,12 +370,12 @@ AC_CACHE_CHECK([for an implementation of va_copy()],dbus_cv_va_copy,[
        int main() {
          f (0, 42);
          return 0;
-       }],
+       }])],
        [dbus_cv_va_copy=yes],
        [dbus_cv_va_copy=no])
 ])
 AC_CACHE_CHECK([for an implementation of __va_copy()],dbus_cv___va_copy,[
-       AC_LINK_IFELSE([#include <stdarg.h>
+       AC_LINK_IFELSE([AC_LANG_SOURCE([#include <stdarg.h>
 #include <stdlib.h>
        static void f (int i, ...) {
        va_list args1, args2;
@@ -388,7 +388,7 @@ AC_CACHE_CHECK([for an implementation of __va_copy()],dbus_cv___va_copy,[
        int main() {
          f (0, 42);
          return 0;
-       }],
+       }])],
        [dbus_cv___va_copy=yes],
        [dbus_cv___va_copy=no])
 ])