Re: another target variable question

[cbrown]

 excellent. thank you.

On Fri, 2007-08-03 at 16:14 -0600, Philip Guenther wrote:
> On 8/3/07, cbrown <address@hidden> wrote:
> ...
> > $(PROJECTS):
> > ifeq ($(MAKECMDGOALS),clean)
> >         @echo "($@,$(CURR))"
> > ifeq ($@,$(CURR))
> >         @echo gonna clean $@
> > else
> >         @echo NOT gonna clean $@
> > endif
> > else
> >         @echo gonna $(MAKECMDGOALS) $@
> > endif
> >
> > When I execute "make CURR=a clean", I get;
> >
> > (b,a)
> > NOT gonna clean b
> > (a,a)
> > NOT gonna clean a
> >
> > How come the "ifeq ($@,$(CURR))" doesn't work?
> 
> Because make's conditionals are evaluated during the parse of the
> makefile, while target-specific variables like $@ are only set during
> the evaluation of the target's rules.
> 
> 
> > Is there an easier path to my goal?
> 
> Yes: use a shell conditional for the test of $@:
> 
> $(PROJECTS):
> ifeq ($(MAKECMDGOALS),clean)
>        @echo "($@,$(CURR))"
>        @if [ x"$@" = x"$(CURR)" ]; then \
>            echo gonna clean $@; \
>        else \
>            echo NOT gonna clean $@; \
>        fi
> else
>        @echo gonna $(MAKECMDGOALS) $@
> endif
> 
> 
> Note the placement of semicolons and backslashes and that the leading
> '@' is only on the first line of the multi-line command.
> 
> 
> Philip Guenther