From: utzoo!decvax!duke!harpo!utah-cs!utah-gr!thomas
Newsgroups: net.unix-wizards
Title: Re:  Library functions with non-integer return types
Article-I.D.: utah-gr.563
Posted: Mon Sep 20 06:00:04 1982
Received: Tue Sep 21 06:27:54 1982
References: sri-unix.3341

When you're using PCC, if you do say extern, then NO storage is even
allocated.  Extern applied to data items generates an undefined
reference if the data item is not declared somewhere without an
extern.  Extern applied to functions is exactly the same as declaring
a function without saying extern.
=Spencer