Shell Programming and Scripting

I have a configuration file, foo.cfg, and a script, bar.sh. bar.sh generates .cc and .h files based on foo.cfg.

To exemplify, let's say it creates apple.cc, apple.h, banana.cc, banana.h, carrot.cc, carrot.h, and so on.

How do I write a Makefile that runs bar.sh if and only if foo.cfg has been modified, and then builds the resulting files? apple.cc and apple.h are guaranteed to exist, but the rest are entirely dependent on the configuration.

I wrote the following rule, which runs bar.sh if foo.cfg changes. However, I don't know how to make a second rule whose targets are apple.o, banana.o, carrot.o, ...

Code:

apple.h: foo.cfg
    bar.sh

Thanks in advance. I've spent 20 hours already reading about macros and experimenting to figure this out, but to no avail. I can't seem to just echo *.cc *.h via macros because, unless I'm doing it wrong (and I hope someone can tell me that I am!), shell statements are executed before the rules are processed, and those .cc and .h files don't exist until the first rule is processed to generate said .cc and .h files.

Miscellaneous details. I'm on Solaris. And I must use a Makefile, or be prepared to explain to my managers why there is absolutely no way that we can use a Makefile for this purpose.

How is this command used to generate these files?

If you don't know what files it's going to generate at Make-time, you'd need to generate your own makefile out of the cfg file somehow.

That's doable: I can't modify the script (it's part of our infrastructure) but I can easily write and call a new script that generates a Makefile. But then, how do I include this new Makefile in the main Makefile?