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Re: GNU make 3.80/3.79.1: Pattern rule broken?

From: Paul D. Smith
Subject: Re: GNU make 3.80/3.79.1: Pattern rule broken?
Date: 16 Sep 2005 08:41:56 -0400
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.4

%% writes:

  a> XX_%ExGw_mt : XX_%ExGw
  a> XX_%Gateway : XX_%ExGw
  a> XX_%ExGw :
  a>        touch foo.c

  a> If you try make XX_ABCExGw_mt, GNU make correctly derives the rule
  a> and execution the touch statement.

No it doesn't... not given the makefile you have above.

  a> If you try make XX_Gateway, GNU make fails with the message "No
  a> rule to make target XX_ABCGateway".

This is correct.

  a> Is the GNU make broken on pattern rule or is there any syntax error in
  a> my makefile?

GNU make is not broken and there's no syntax error in your makefile.
But, there is a semantic error.

A pattern rule with no command script is NOT the same as an explicit
rule with no command script: the former DELETES an existing pattern rule
with the same target/prerequisite.  It does not create a new pattern

Check out the docs for pattern rules in the GNU make manual.


 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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