Re: Call with computed variable names

[Ken Smith]

On Thu, Sep 16, 2004 at 05:00:32PM +0100, David Kilroy wrote:

> My new problem, still related to computed variables, eval, call and friends
> is shown below. In this case the dependencies of a target do not appear to
> be expanded correctly.

These things are tricky.  I have been recently wrestling with very
similar issues.  Here's the fix.

$$($(1)_TGT) : $$($(1)_OBJS)

I got this output.

Sources are foo.c
Objects are foo.o
Flags are bar
foo.o depends on foo.o

HTH,
Ken

> I've tried various combinations of adding extra $, and using the value
> function to no avail. Any help appreciated.
> 
> Thanks,
> 
> Dave.
> 
> dkilroy
> $ cat Makefile
> 
> FOO_SRCS=foo.c
> 
> define TEMPLATE
> $(1)_OBJS=$$($(1)_SRCS:.c=.o)
> $(1)_TGT = foo
> 
> $$($(1)_TGT) : $(1)_FLAG=bar
> $$($(1)_TGT) : $(value $(1)_OBJS)
> endef
> 
> $(eval $(call TEMPLATE,FOO))
> 
> all: foo
> 
> foo :
>         @echo Sources are $(FOO_SRCS)
>         @echo Objects are $(FOO_OBJS)
>         @echo Flags are $(FOO_FLAG)
>         @echo foo.o depends on $^
> 
> dkilroy
> $ make
> Sources are foo.c
> Objects are foo.o
> Flags are bar
> foo.o depends on
> 
> dkilroy
> $
> 
> 
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