RE: character substitution loop and eval

[Dill, John]

>> I have a problem I want to create a list of characters to pass to a function 
>> which
>>calls subst over that list.  I want to do something like this.
>> 
>> my_chars:=1 2 3 4 5 6 7 8 9
>> 
>> my-subst=$(eval temp_variable := $1)$(foreach iter,$(my_chars),$(eval 
>> temp_variable:=$(subst $(iter),,$(temp_variable))))$(temp_variable)
>> 
>> where my_chars could be simply $2.
>> 
>> I'm new to 3.80 so I'm not very familiar of the capabilities of eval.  Can I 
>> store
>>temporary state within a foreach loop?  This way I wouldn't need a lot of 
>>nested subst
>>to implement this in make.  (I can also do this with a program easily enough, 
>>but I
>>want to try to implement it within make).
>> 
>> Is there a way to make this kind of loop work in 3.80?
>
>I think what you are trying to do is remove certain characters from a list.   
>You can do >this like this:
>
>remove_these_characters := 1 2 3 4 5 6 7 8 9
>
>my_subst=$(strip $(eval temp_variable := $2)$(foreach c,$1,$(eval 
>temp_variable :=
>$(subst $c,,$(temp_variable))))$(strip $(temp_variable)))
>
>bar := $(call my_subst,$(remove_these_characters),a1b a2c a3d drg)
>
>If you run that Makefile then the list 'a1b a2c a3d drg' has all numbers 
>removed from it >and bar ends up being 'ab ac ad drg'.

That's what I needed.  For some reason, my eval wasn't working because after I 
installed make 3.80, my make wasn't updated until I closed the shell and 
reopened it, probably was linked to 3.79.1 somehow.

Thanks,
John D.