The behavior you're getting is correct. When you list two targets, it isn't
just for convienience so you don't have to type the rule twice. If a rule
creates both targets for some reason, you only want the rule to run once.
This is for rules that create multiple files.
For example, I have a script that does heavy parsing of a data file and
produces 4 different outputs. Each is derived from a single source file, but
4 output files are created so that the file doesn't have to be parsed 4
seperate times.
One can assume that if the files have the same pattern for %, then they're
related and can be made by the same rule. If different patterns for % need
to be made, then it seems logical to run two rules to create them.
$@ only represents the filename that caused the rule to execute, hence the
reason why "touch a.foo a.bar" isn't running.
You need to do this to get the behavior you want:
%.foo :
touch $@
%.bar :
touch $@
if the rule is particulary complex, then simply define it as a variable like:
MAKE_FOO_OR_BAR = touch $@
%.foo :
$(MAKE_FOO_OR_BAR)
%.bar :
$(MAKE_FOO_OR_BAR)
(note that you *don't* use := to assign since this would expand the $@
prematurely)
Mike Gibson
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