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From: rabbit@eddie.mit.edu (Warren J. Madden)
Newsgroups: comp.sys.mac.programmer
Subject: THINK C: Trouble with multiply #included files
Message-ID: <1991Apr15.002722.18346@eddie.mit.edu>
Date: 15 Apr 91 00:27:22 GMT
Sender: news@eddie.mit.edu (Usenet News)
Reply-To: rabbit@eddie.mit.edu (Warren J. Madden)
Organization: MIT EECS/ECF Facility, Cambridge Mass
Lines: 20


Greetings, netfolk.

	I have been working on a program in THINK C 4.0.2, and have
encountered a problem with several include files I'm using.  The manual
says (in reference to TCL header files) that if you want a file to only be
included once, #define _H_filename, where filename is the name of the
include file.  I attempted to do this with other include files, but started
getting multiply declared variable problems popping up at link time.

	Does this feature only work with TCL header files?  What is the
means by which it is implemented?  Right now I'm working around the problem
by emulating the feature using #ifdef, but I'd like to know if I should be
doing it some other way.


Thanx in advance,

Warren J. Madden
rabbit@eddie.mit.edu