question about Generating Prerequisites Automatically

[Lin George]

Hello everyone,


I am reading through GNU make manual about "Generating
Prerequisites Automatically" topic. I do not quite
understand what the following statements mean (Section
4.14),

--------------------
Note that such a prerequisite constitutes mentioning
main.o in a makefile, so it can never be considered an
intermediate file by implicit rule search. This means
that make won't ever remove the file after using it;
see Chains of Implicit Rules. 
--------------------

Could anyone show me a simple sample please?


thanks in advance,
George

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