[Cython] unspecified return type for extern C++ functions

[Lisandro Dalcin]

In a previous thread, Robert asked about issuing a warning in the case
of unspecified return type for extern C++ functions. I'm definitely +1
for it... Moreover, I would extend it for ANY extern C function. IMHO,
this is a case for "explicit is better than implicit".


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Lisandro Dalcin
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