How to generate the _imp_ prefix?

MinGW shall compile a shared C library mylib that contains functions like

   declspec(dllexport) int foo();

The library shall be used in a C++ application under Visual Studio.

To inspect the compilation outcome,

   dumpbin /HEADERS mylib.lib

prints one stance per exported function. The stance for the above function
foo contains the line

   Symbol name  : _foo

So, MinGW does not generate the prefix _imp_. Expectedly, linking the
dependent application fails because Visual Studio cannot find _imp_foo.

How to get this right?

[cross-posting from https://stackoverflow.com/questions/59845249/]

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