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From: ballou@brahms.Berkeley.EDU.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: Problems with MSC 5.0
Message-ID: <1427@cartan.Berkeley.EDU>
Date: Wed, 25-Nov-87 04:20:26 EST
Article-I.D.: cartan.1427
Posted: Wed Nov 25 04:20:26 1987
Date-Received: Sat, 28-Nov-87 14:29:01 EST
References: <754@pilchuck.Data-IO.COM> <1610047@hpcvlo.HP.COM> <1203@lznv.ATT.COM>
Sender: usenet@cartan.Berkeley.EDU
Reply-To: ballou@brahms.Berkeley.EDU.UUCP (Kenneth R. Ballou)
Organization: Math Dept. UCB
Lines: 32

In article <1203@lznv.ATT.COM> psc@lznv.ATT.COM (Paul S. R. Chisholm) writes:
>In article <1610047@hpcvlo.HP.COM>, jason@hpcvlo.HP.COM (Jason Su) writes:
>> /* Here's another irritating bug that compiled(!) w/o errors on MSC 4.0. */
>> typedef int map;
>> 
>> typedef struct {
>> 	int *map;		/* <-- This is the error line */	
>> } my_struct;		
>
>K&R, p. 200:  "Declarations whose 'storage class' is typedef do not
>define storage, but instead DEFINE IDENTIFIERS WHICH CAN BE USED LATER
>AS IF THEY WERE TYPE KEYWORDS . . ."  [emphasis mine]
>
>The identifier "map" is effectively a reserved keyword from the time
>its typedef is complete through the end of the compiled module.  MSC
>4.0 was incorrect in accepting this code in the first place.  I suspect
>that most C compilers that support typedef will reject it.

Er, well, you are correct in the strict sense of K&R.  However, it is
my impression that Microsoft is moving their C compiler towards compliance
with the draft ANSI standard.  Now, unless I am misreading the standard,
the members of a struct reside in a name space unique to that struct;
moreover, this name space is disjoint from that in which typedef identifiers
reside.  Hence, if the goal is to follow the ANSI standard, it would seem
MSC 5.0 is in error.



Kenneth R. Ballou			ARPA:  ballou@brahms.berkeley.edu
Department of Mathematics		UUCP:  ...!ucbvax!brahms!ballou
University of California
Berkeley, California  94720