does anyone know this makefile?

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Hi.
I trying to study Makefile. But I have some questions.

1. What is the .PHONY 's function?

2. When I run 'simz', Which lines are executed?

3. clean: * you can see the "subdirs_clean", What is having a meaning? And What is having a purpose?



.PHONY: all clean simz


all:

@echo "[all] : OK."


simz:

*- /bin/rm -rf app

**$(/simz/BUILD/run)


clean: * subdirs_clean

- /bin/rm -f Makefile.depend


veryclean : subdirs_verycle


gethash :

*Xxxxxxxxxx
 

The 'clean' target usually deletes temporary / intermediate and dependency files.
 

Hi .
After I have compiled makefile, when I once trying to make make again. But I can have nothing result with any warning messages or error messages.

So how can I re-compile?
And how makefile does know it have been make by make?
 

A makefile basically lists input files and output target files.

It only rebuilds if the timestamps on the input files are newer than the output files.

Use 'make clean all' to delete all the output files and force a rebuild.
 

Would you please let me know how "Makefile" should handle timestamp?
 
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