On Sunday, August 04, 2013 12:30:48 AM Roland Mainz wrote: > On Sun, Aug 4, 2013 at 12:04 AM, Dan Douglas <orm...@gmail.com> 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
