Re: Can I defer make-var expansion until a command is executed

[Chen Jun （陈军）]

Brian Dessent wrote:
> Chen Jun  wrote:
>
>   
> > How can I do it? I know I can add another rule to accomplish that, e.g.
> >     
>
> Why do you even need $(shell ...) here?  All the commands in the recipe
> are implicitly evaluated by the shell, so just do your conditional there:
>
> outfile = out.txt
>
> $(outfile):
>         @echo -n "STRT: $@ "; if [ -f $@ ]; then echo exist; else echo absent; 
> fi
>         @touch $@
>         @echo -n "DONE: $@ "; if [ -f $@ ]; then echo exist; else echo absent; 
> fi
>
> Brian
>
>   
Well Brian, the example presented by me is just a fabricated one, not 
for my real world use. I use $(shell ) just to introduce a make variable 
or a make function so that my question becomes concrete. My real world 
case regarding this problem is quite a bit complex so I'd like not to 
talk about to it directly.

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