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GCC 5.0, with its new -Wformat-signedness, warns about the sign being different between a type and the format string in printf-format messages, leading to compiler warnings with G_OBJECT_WARN_INVALID_PSPEC. In other uses of __LINE__ inside GLib, %d is used, and GCC seems to expect a format specifier of %d as well: https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html https://bugzilla.gnome.org/show_bug.cgi?id=744263
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