Article View: comp.std.c
Article #5530Re: 31 character identifier length
From: Liber
Date: Fri, 23 Dec 1988 03:43
Date: Fri, 23 Dec 1988 03:43
31 lines
1509 bytes
1509 bytes
In article <10237@rpp386.Dallas.TX.US> jfh@rpp386.Dallas.TX.US (The Beach Bum) writes:
>My compiler d' jour provides warning messages only if two objects exist
>inside the same compilation unit and don't have names unique to 31
>characters. One would hope the compiler would a) use the complete
>identifier, or 2) complain about a multiply defined symbol, but not
>accept a second definition and then ignore it ...
let me give a clearer example:
int ThirtyTwoCharacterVariableIdentG;
...
void foo(void)
{
int ThirtyTwoCharacterVariableIdentL;
...
ThirtyTwoCharacterVariableIdentG = 1;
...
}
How a compiler handles this is, according to 3.1.2, 10/88 draft,
implementation limits section, paragraph 2, p.21:
"If two identifiers differ in a non-significant character, the behavior
is undefined."
In other words, using identifiers > 31 characters can be (although not
necessarily are) dangerous!
--
NEVIN ":-)" LIBER AT&T Bell Laboratories nevin1@ihlpb.ATT.COM (312) 979-4751
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!cmcl2!rutgers!att!ihlpb!nevin1 From: nevin1@ihlpb.ATT.COM (Liber) Newsgroups: comp.std.c Subject: Re: 31 character identifier length Message-ID: <9265@ihlpb.ATT.COM> Date: 23 Dec 88 03:43:30 GMT References: <3236@pegasus.ATT.COM> <9167@smoke.BRL.MIL> <12643@bellcore.bellcore.com> <9234@ihlpb.ATT.COM> <10237@rpp386.Dallas.TX.US> Reply-To: nevin1@ihlpb.UUCP (55528-Liber,N.J.) Organization: AT&T Bell Laboratories - Naperville, Illinois Lines: 31