Don't refer to --sync anymore

That commandline option got replaced with an environment variable,
so mention that in the warning text.

https://bugzilla.gnome.org/show_bug.cgi?id=662132

diff --git a/gdk/x11/gdkdisplay-x11.c b/gdk/x11/gdkdisplay-x11.c
index 1eb62ffba89c272e1fb42c68d21c7feb281d0979..95b22f655a6f28d3d47e9df5c95df1a6b8e8c054 100644 (file)
--- a/gdk/x11/gdkdisplay-x11.c
+++ b/gdk/x11/gdkdisplay-x11.c
@@ -2360,8 +2360,8 @@ _gdk_x11_display_error_event (GdkDisplay  *display,
                          "  (Details: serial %ld error_code %d request_code %d minor_code %d)\n"
                          "  (Note to programmers: normally, X errors are reported asynchronously;\n"
                          "   that is, you will receive the error a while after causing it.\n"
-                         "   To debug your program, run it with the --sync command line\n"
-                         "   option to change this behavior. You can then get a meaningful\n"
+                         "   To debug your program, run it with the GDK_SYNCHRONIZE environment\n"
+                         "   variable to change this behavior. You can then get a meaningful\n"
                          "   backtrace from your debugger if you break on the gdk_x_error() function.)",
                          g_get_prgname (),
                          buf,