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Kjell Ahlstedt authored
gcc8 -Wextra prints a warning when reinterpret_cast is used for conversion between different types of function pointers. Avoid that by adding Glib::bitwise_equivalent_cast<>() with a union with members of the two types of function pointers. * glib/src/optiongroup.ccg: Use Glib::bitwise_equivalent_cast<>() to convert from a function pointer to void*. See https://github.com/libsigcplusplus/libsigcplusplus/issues/1
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