[bug #44942] OR-ing recipes to allow alternative requsites

[Carl Ponder]

URL:
  <http://savannah.gnu.org/bugs/?44942>

                 Summary: OR-ing recipes to allow alternative requsites
                 Project: make
            Submitted by: carlponder
            Submitted on: Mon 27 Apr 2015 04:51:46 PM GMT
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: None
           Fixed Release: None
           Triage Status: None

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Details:

I'd like to be able to write some rules like this:

file : %.tar
    tar -xvf $<

file : %.tgz
    tar -xzvf $<

file : %.tar.bzip2
    tar -xjvf $<

etc., where the rules would be tested in sequence until one is found with
satisfiable pre-requisites. In this case it would look for any of the listed
tar-files and then apply the unpacking rule.

I know that there are ways around this, but the procedural solution of adding
conditional statements into the recipe body looks like a hack compared with
this.

Have you guys considered these kinds of OR-recipes for other reasons?




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