Parsing the Makefiles

[Peter Bocan]

Hello Make community,

I am currently interested in the parsing and processing of Makefiles and I have 
a few questions regarding Make:

- Is there any sort of EBNF grammar description of the Makefile format? 
- As far as I understand it, the Make processes Makefiles based on lines, is 
that correct?
- how does Make differentiate if the target of a rule is a file or not? I have 
noticed that there are occurrences where files are checking for  „.o“ files.
- when does the recipe definition end? If I have a blank line in between the 
recipe lines, should the recipe continue?

Kindly,
Peter Bocan.