How to construct a static global variable in C?

In A. H have you actually got the extern declaration within the actual class A? Your question currently says this in words but then your code snippet suggests it is at file level.

The only way I can get the error you are talking about i.e. "storage class specified for foo" is for the following in A.h.

Since your error is on the extern, I'm guessing it doesn't know what the type is.

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