question about gcc/g++ -M option

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Hello everyone,


What is the function of gcc/g++ -M option? I have read
through the man page but still can not understand.
Could anyone show me an example please?

Linux man page

--------------------
Instead of outputting the result of preprocessing,
output a rule suitable for make describing the
dependencies of the main source file. The preprocessor
outputs one make rule containing the object file name
for that source file, a colon, and the names of all
the included files, including those coming from
-include or -imacros command line options. 
--------------------


thanks in advance,
George

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