dtweed's solution is the most elegant but I favor this (which mostly does the
same thing, but is more explicit):

--header.h--
#ifndef HEADER_H

#ifndef HEADER_C
#define EXT extern
#endif

#define BARLEN 256

EXT int Foo;
EXT char Bar[BARLEN];

void Thisfunc((void*)that);

#ifndef HEADER_C
#undef EXT
#endif

#define HEADER_H
#endif
--header.h end--

--header.c--

#include ...

#define HEADER_C
#include "header.h"
--header.c end--

--other.c--
#include "header.h"
...
--other.c end--

It works fine. Another option is to duplicate the definitions without extern in
a header file with the same name but prefixed with _ e.g. _header.h

Ultimately, it is a question of discipline and makefiles to get things right
imho. When you do not work alone, the header files should have been written
*ages* ago, together with the type definitions and prototypes, imho.

Peter P.


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist