How does C's “extern” work?

Question

I have a C/C++ program that\'s a plugin to Firefox. Because it\'s a plugin, it has non-main entry points. Those entrypoints need to be compiled in C because otherwise they g

Answer 1

It is already enough when you only extern "C" the entities you need to be externally visible. You can make a standard cc/cpp/cxx/... file, but cherry pick C-names:

class Foo {};

extern "C" int someInterfaceFun () {
    Foo foo;
    return 0xFEED;
}