[bug #27047] Difficulties defining prerequisites for pattern targets.

[Robert L Walton]

URL:
  <http://savannah.gnu.org/bugs/?27047>

                 Summary: Difficulties defining prerequisites for pattern
targets.
                 Project: make
            Submitted by: walton
            Submitted on: Fri 17 Jul 2009 10:18:57 AM GMT
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 3.81
        Operating System: POSIX-Based
           Fixed Release: None

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Details:

Implicit rules with a pattern target are NOT recognized if they have no
commands.

This means they cannot be used to define prerequisites.  I.e.


test1%.out:<tab>test1


does'nt do anything.  Also


test1%.out:<tab>TEST=test1
test%.out:<tab>${TEST}


fails because target specific variables cannot be used in prerequisite list.

Something should be done to make this so users don't get trapped
by it an have to waste a lot of time figuring all this out.  Perhaps a
pattern rule with no commands could give a warning message, at a minimum.  It
would be nice if target specific variables could appear in prerequisites.
~




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