Date: Tue, 3 Oct 2000 14:49:11 -0500 From: Dan Nelson <dnelson@emsphone.com> To: Larry Lile <lile@stdio.com> Cc: hackers@FreeBSD.ORG Subject: Re: Question about -Wchar-subscripts Message-ID: <20001003144911.A12803@dan.emsphone.com> In-Reply-To: <Pine.BSF.4.05.10010031536460.75472-100000@heathers.stdio.com>; from "Larry Lile" on Tue Oct 3 15:46:36 GMT 2000 References: <Pine.BSF.4.05.10010031536460.75472-100000@heathers.stdio.com>
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In the last episode (Oct 03), Larry Lile said: > > ...we get scores of warnings about using characters as subscripts > to an array (-Wchar-subscripts), which generates so much noise as > to mask real warnings burried within. Therefore, I would like to > suppress this warning unless someone can explain why using a char > as an array subscript is in any way an illegitimate thing to do. > As far as I can tell, getting rid of the warning by changing the > code would require adding a large number of frivolous casts to > scores of source files... > > So why is using a "char" as an array subscript wrong? I had always > avoided it because the compiler complained and that was good enough > for me. Because your char value could be negative and end up referencing memory before your array start. Mainly a problem with the ctype macros and high-ascii characters. -- Dan Nelson dnelson@emsphone.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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