Re: unwanted prerequisities

[Paul D. Smith]

%% Krzysztof Horecki <address@hidden> writes:

  kh> I wonder why I can't do it by:  

  kh> % :: %.w 

Oh, I see what you're saying.

This doesn't work because it's not the same as the built in rule.  You
can only cancel a rule by using the _same_ target and prerequisite
pattern(s) as were used to define the rule.

In this case, the pattern used to define the rule (use make -pf/dev/null
to see the complete list of built in rules) is:

  %.c : %.w %.ch

So you have to use exactly that pattern to get rid of it, not "% :: %.w".

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