>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]
>On Behalf Of Peter P.
>Sent: 25 October 2007 19:55
>To: piclist@mit.edu
>Subject: Re: [EE] Global variables in projects with many C files.
>
>
>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];

Oops, reposted due to being at work too late and writing gibberish!  I meant to say:

Unless I have missed something this will fail to compile if HEADER_C *is* defined, since the EXT symbol will not exist.

#ifndef HEADER_C
#define EXT extern
#else
#define EXT
#endif

Regards

Mike

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