Re: include files with :=

[Paul D. Smith]

%% Noel Yap <address@hidden> writes:

  dj> my_var:=$(shell script)

  ny> File open/close is a very expensive operation.  If you're
  ny> including many makefiles, this may be where your lag is coming
  ny> from.

File open/close is a trivial operation compared to invoking a shell,
though! :-)

  ny> Also, whenever you include a makefile, there's a chance that make
  ny> will re-exec although the details aren't coming to me right now.

If (a) make can find a rule that will build the included makefile, and
(b) that rule shows the included makefile is out of date, then make will
rebuild the included makefile and re-exec.

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