I'm starting a new project and thinking of using gcc 6.3.1 -MM to generate the dependencies into a file called Make.Dep, that I'll include from Makefile.
The -M option outputs all headers, including system headers. The -MM option doesn't output system headers, but I'm still buried in literally thousands of vendor and package headers such as Sybase and Boost, which I don't think will change (and if they do I'm happy to have to do a full rebuild manually).
Obviously I could wrap gcc -MM in a perl script or what have you that knows what directories I consider packages, but is there some more widely-accepted solution?
Note that one of my vendors' headers look for specific gcc-defined pre-processor symbols to configure their portability. I'd rather not curate a set of such symbols manually to allow dependency generation with some non-gcc method (e.g., makedepend).