One definition rule and different class definitions in two translation units

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Your program has undefined behavior. Paragaph 3.2/6 of the C++11 Standard specifies:

There can be more than one definition of a class type (Clause 9), […] in a program provided that each definition
appears in a different translation unit, and provided the definitions satisfy the following requirements. Given
such an entity named D defined in more than one translation unit, then […]

And what follows is a list of requirements that your program is indeed violating. However, at the end of the list, this is mentioned:

[…] If the definitions of D satisfy all these requirements,
then the program shall behave as if there were a single definition of D. If the definitions of D do not satisfy
these requirements, then the behavior is undefined.

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