What does mean for a name or type to have a certain language linkage?

Question

According to (c) ANSI ISO/IEC 14882:2003, page 127:

Linkage specifications nest. When linkage specifications nest, the innermost one determines the langu

Answer 1

extern "C" typedef void FUNC();
FUNC f2;
// the name f2 has C++ language linkage and the
// function's type has C language linkage

The name FUNC is declared with "C" linkage because it says extern "C" on the first line.

The name f2 has C++ linkage because that is the default, and no other linkage is given on line two.

The fact that the name f2 is used to refer to a function with C linkage doesn't change the linkage of the name.