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Message-ID: <20190214235814.GY23599@brightrain.aerifal.cx>
Date: Thu, 14 Feb 2019 18:58:14 -0500
From: Rich Felker <dalias@...c.org>
To: "jounijl@...oo.co.uk" <jounijl@...oo.co.uk>
Cc: musl@...ts.openwall.com
Subject: Re: "Arithmetic exception" with modulus operator '%'
On Fri, Feb 15, 2019 at 03:35:23AM +0000, jounijl@...oo.co.uk wrote:
>
> As in the headline. Program stops and prints "Arithmetic exception"
> at the line where the modulus operator '%' is.
>
> I'm compiling in Alpine linux with clang installed from apk:s:
>
> clang -c test.c
> clang -o test test.o
>
> The code is:
>
> ----- snip -----
> unsigned int unum = 0;
> unsigned int umod = 0;
> unsigned int ures = 0;
> ures = unum % umod; // <-- this one
> ----- /snip -----
>
> The variables have some values other than 0.
I don't follow. You say they have some value other than 0, but the
above example snippet has them as zero, and if they're 0 it's
undefined behavior and a fault of some sort is a typical result. What
did you expect to happen?
Rich
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