Re: Getting the target of an implicit rule within the rule

[Paul D. Smith]

%% Ronald Landheer-Cieslak <address@hidden> writes:

  rl> %.d : $(srcdir)/$(subst .d,.c,$@)
  rl>       blah

  rl> $@, however, is empty here (as the docs duely indicate).

  >> Why not just use the obvious:
  >> 
  >> %.d : $(srcdir)/%.c

  rl> because the obvious doesn't work if there's a pathname in the
  rl> target filename (i.e. target == dir/file.d, prereq would become
  rl> dir/$(srcdir)/file.c because the stem of the pattern is "file",
  rl> not "dir/file").

Well sure, that won't work, but that's not the example you gave.  It's
hard to give solutions that work for examples that are not provided :).


Typically what I do is not try to install the srcdir inside the pathname
but rather have it at the top.  If you have to put it inside you'll have
to write a different rule for each value of "dir".  You can use $(eval
...) (in the newest releases of GNU make) to do this without typing it
all out.

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