Disable -Wreturn-stack-address for Clang #57
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Clang has some problems correctly detecting these, giving false positives.
See http://stackoverflow.com/questions/33736678/returning-reference-to-local-temporary-object-on-pointer-dereferencing
Currently, this affects
cppexpose::Variant<T>::value(const T & defaultValue = T())where T is a pointer type. Returning thedefaultValuepointer by-value is fine (as is copies the pointer value); however, Clang issues a "Returning address of local temporary object" warning.