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Re: [ast-users] Arithmetic assignment side-effects


From: Dan Douglas
Subject: Re: [ast-users] Arithmetic assignment side-effects
Date: Sat, 03 Aug 2013 17:41:13 -0500
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On Sunday, August 04, 2013 12:30:48 AM Roland Mainz wrote:
> On Sun, Aug 4, 2013 at 12:04 AM, Dan Douglas <address@hidden> wrote:
> > Is it specified what the value of x should be after this expression?
> >
> > x=0; : $((x+=x=1))
> >
> > Bash, ksh93, mksh, posh say 1. zsh, dash, busybox say 2. Clang and gcc 
> > both throw warnings about it, but both plus icc agree on 2.
> 
> Just curious: Is that x86-specific or is the result always the same on
> other architectures, too ? Maybe there is something in ISO C1X/C99
> which actually defines or recommends a specific compiler behaviour.
> Maybe we should ask the "clang" people about the "why ?" ...

I've only tested x86 but my hunch would be it either requires/suggests 2, or 
leaves it unspecified.

-- 
Dan Douglas



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