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0882bce989
The libsn API provides its timestamps in the "Time" X11 type, which is usually is a typedef for "unsigned long". The type of the "timestamp" parameter of StartupNotificationSequence is a signed 64 bit integer. When building on an architecture where a "unsigned long" is not 64 bit, we'd then pass a 32 bit unsigned integer via a va_list where a signed 64 bit integer is expected causing va_arg to read past the passed 32 bit unsigned integer. Fix this by ensuring that we always pass the expected type via the va_list. Also change the internal timestamp type from time_t (which size is undefined) to gint64, to avoid any potential overflow issues. https://bugzilla.gnome.org/show_bug.cgi?id=762763