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Re: (b)make: selecting every other element from a list

On Thu, Sep 03, 2015 at 06:37:32PM +0200, Edgar Fu? wrote:
> Thanks.
> > l2:=
> Any particular reason for using := and not = in this place?
> > .for _i _j in $(l)
> > l2+=$(_i)
> > .endfor
> Oops. I was sure this didn't work in older (NetBSD 4.0.1) versions of (b)make, 
> but I just checked it does work. I (wrongly) remembered this ending up in l2 
> being ${_i} ${_i} ${_i} after the loop, and subsequent expansion of ${l2} 
> repeating the last value ${_i}?was set to. Strange.

It used to be difficult to get the required delayed expansion of the loop
I fixed it a while ago by some magic transformation I can't quite remember.


David Laight:

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