Re: [Automake-NG] [FYI] [ng] vars: names of iterating vars in $(foreach) loops shorter & simpler

[Akim Demaille]

Le 24 juil. 2012 à 15:45, Stefano Lattarini a écrit :

> In GNU make, after a "$(foreach x,...)" loop, the make variable $(x):
> 
>  - is restored to its original variable it had before the 'foreach'
>    loop, if it was already set;
> 
>  - re-unset otherwise.
> 
> This behaviour is checked by the recent spy test 't/spy-foreach.sh'.
> 
> This means that, in most situations, there's no actual need to use
> a "namespace safe" variable name for the iterating variable in a
> "$(foreach ...)" loop, because that variable won't linger in the
> environment after the loop anyway.
> 
> * lib/am/compile.am, lib/am/header-vars.am, lib/am/parallel-tests.am,
> lib/am/serial-tests.am: Adjust to use simpler variables names in their
> foreach loops; for example, simply 'v' instead of 'am__v', etc.

I might be stretching things too far, but imagine that some
one defines v in her Makefile.am, at the top level, because
for instance she can factor longish definitions in EXTRA_DIST.

v = headers/include/pkg
EXTRA_DIST = $(v)/1.h $(v)/2.h $(v)/3.h $(v)/4.h $(v)/5.h

Then I guess you are capturing this $(v) to mean something else.