--- /dev/null
+dnl
+dnl Check for working do while(0) macros. This is used by G_STMT_START
+dnl and G_STMT_END in glib/gmacros.h. Without having this defined we
+dnl get "ambigious if-else" compiler warnings when compling C++ code.
+dnl
+dnl Copied from GLib's configure.in
+dnl
+AC_DEFUN([AG_GST_CHECK_DOWHILE_MACROS],[
+
+dnl *** check for working do while(0) macros ***
+AC_CACHE_CHECK([for working do while(0) macros], _cv_g_support_dowhile_macros, [
+ AC_TRY_COMPILE([],[
+ #define STMT_START do
+ #define STMT_END while(0)
+ #define STMT_TEST STMT_START { i = 0; } STMT_END
+ int main(void) { int i = 1; STMT_TEST; return i; }],
+ [_cv_g_support_dowhile_macros=yes],
+ [_cv_g_support_dowhile_macros=no],
+ [_cv_g_support_dowhile_macros=yes])
+])
+if test x$_cv_g_support_dowhile_macros = xyes; then
+ AC_DEFINE(HAVE_DOWHILE_MACROS, 1, [define for working do while(0) macros])
+fi
+])