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Re: Can make ignore timestamp of prerequisite?

From: Paul D. Smith
Subject: Re: Can make ignore timestamp of prerequisite?
Date: 25 Feb 2006 20:49:12 -0500
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.4

%% writes:

  wk> To clarify and summarize what I'm asking, I want to somehow define
  wk> a rule where the commands are executed ONLY if the target does not
  wk> exist.  I want to prevent the rule from being applied when the
  wk> prerequisite is simpy newer than the target.

If you want a rule to run only when a target doesn't exist, just don't
define any prerequisites at all.  Then, if the target exists the rule
won't run and if it doesn't exist, it will run.

If you want to declare a build order, then use order-only prerequisites:

    target : | oo-prereq1 oo-prereq2 [...]

Note this won't work with older versions of GNU make.

 Paul D. Smith <>          Find some GNU make tips at:            
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist

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