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From: mbr@aoa.UUCP
Newsgroups: net.unix-wizards,net.lang.c
Subject: Pre-defined pre-processor symbols
Message-ID: <429@aoa.UUCP>
Date: Mon, 24-Mar-86 19:23:02 EST
Article-I.D.: aoa.429
Posted: Mon Mar 24 19:23:02 1986
Date-Received: Wed, 2-Apr-86 03:11:39 EST
Reply-To: mbr@aoa.UUCP (Mark Rosenthal)
Distribution: net
Organization: Adaptive Optics Assoc., Cambridge, Mass. USA
Lines: 23
Xref: watmath net.unix-wizards:17424 net.lang.c:8328

Can anybody answer the following questions.  Please send mail instead of
posting the answers.  I will summarize.

 1. I know that the C pre-processor pre-defines a few symbols, including
    __LINE__ and __FILE__, but I have been unable to find this documented
    in K&R anywhere.  Is this a quirk of PCC or is it true of all C
    compilers?

 2. I know that there's also one which tells what machine you're generating
    code for, but I can't remember its name.

 3. Is there a symbol which tells what function you're in?  (Hmmmm... seems
    highly unlikely since the pre-processor wouldn't even know it was looking
    at a function, but maybe somebody hacked it in some other way.)

 4. Are there any other pre-defined symbols?  

Thanks in advance.
-- 

	Mark of the Valley of Roses
	...!{decvax,linus,ima,ihnp4}!bbncca!aoa!mbr
	...!{wjh12,mit-vax}!biomed!aoa!mbr