Re: Target-specific variables in implicit rules

[Paul D. Smith]

%% Dario Teixeira <address@hidden> writes:

  dt> Now, the problem happens when I use target-specific variable
  dt> values.  If I understood the make manual, all prerequisites should
  dt> inherit those target-specific variables, but this does not seem to
  dt> happen with the implicit rule.

They are inherited; if you printed those values inside the command
script you'd see them.

Check the docs more carefully: target-specific values are ONLY valid
inside command scripts (they have the same lifetime and scoping rules as
automatic variables like $@, etc.)

  dt> all: draft
  dt> draft: PREFIX=before
  dt> draft: SUFFIX=after
  dt> draft: prefix_foobar_suffix.out

  dt> $(PREFIX)_%_$(SUFFIX).out : $(PREFIX)_%_$(SUFFIX).in
  dt>          generate $< $@

Here you're trying to use them in a target/prerequisite list: that won't
work.

  dt> Also, is there any other way to achieve what I want?

I guess I'm not really sure what you're trying to achieve.  Why not just
write:

    all: draft
    draft: prefix_foobar_suffix.out

    %.out : %.in
            generate $< $@

??

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