Re: multiple targets in one rule

[Paul D. Smith]

%% Christian Bird <address@hidden> writes:

  cb> PythonLexer.java PythonParser.java PythonParserTokenTypes.java \
  cb> PythonParserTokenTypes.txt : python.g
  cb>         $(ANTLR) python.g

  cb> This works, but it ends up running antlr on python.g four times
  cb> which seems bad.

Multiple targets is the same as defining multiple rules.  That is:

    foo bar baz : biz
        echo $@

is the same as:

    foo : biz
        echo $@
    bar : biz
        echo $@
    baz : biz
        echo $@

which is not what you want.  You need to use pattern rules;
unfortunately they only work if there is a commonality between the
target(s) and prerequisite(s).  Change the name of your input file to
Python.g (or change the name of the output files to "python*"), then:

    %Lexer.java %Parser.java %ParserTokenTypes.java %ParserTokenTypes.txt : \
        %.g
            ...


See the GNU make manual for details.

-- 
-------------------------------------------------------------------------------
 Paul D. Smith <address@hidden>          Find some GNU make tips at:
 http://www.gnu.org                      http://make.paulandlesley.org
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist