making makefile

[mors123456]

Probably I am stupid but can not get it...

I want to compile different projects within one Makefile.
Something like that:

#my makefile

project.id = 01

lesson$(project.id).class: lesson$(project.id).java
javac lesson$(project.id).java

clean:
rm -f *.class

So, is it possible to assign the $(project.id) from command line?
I mean externally not internally like it was in above example.

Just like
>make 'write here something simple to assign project id'

Any ideas? Thank you

[Cabhan]

Well, the simplest solution would be to simply have a different target for each lesson. So you have a target called "lesson01", a target called "lesson02", etc. Then you just call "make lesson01", "make lesson02", etc.

The problem with this is that whenever you add a new lesson, you need to add a new line to the Makefile. Furthermore, each line in the Makefile will be very similar.

The other approach is to use the ID variable and give it a value in the commandline:
GNU Make - How to Run @code{make}

This allows me to say:

make project.id=1

The variable "project.id" is now 1 in the Makefile, and may be used accordingly.

Does this help?

[mors123456]

make project.id=1

It works perfectly. Thanks!