Rule 5.5 and unused extern declarations

[roberto]

Shirely you jest....."

What does that mean?

My copy of MISRA-C:2004 says inthe rational for that rule "One example of this confusion is having an identifier name with internal linkage in one file and the same identifier name with external linkage in another file"

Did you read the text with the rule?

Of course I read it. My doubts concern the notion of "having an identifier name". In concrete, I have file f.c that includes a header file only to get access to a macro. That header file is not included by any other file in the project, and f.c does not use any of the extern declarations in that header file. So the question whether names in the totally-unrelated file g.c should be flagged does not seem completely stupid to me.