no prerequisites and no target in command

[sharan basappa]

clean:
<TAB> rm -f *.o lexer.c

I am trying to understand how make interprets rules with exceptions.

In the above rule

 1) - target has no prerequisites.

 2) - the command does not generate target

According to make if no prerequisites are specified then make must interpret 
this as target always being upto date and do nothing at all

According to make if command does not generate  the target then make must 
always execute the command. In the above cases, we have both the conditions 
in a single rule, and make executes the command. DOes this mean that rule 2 
has more precedence over 1 ?

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