[petsc-users] makefile for compiling multiple sources

[Jed Brown]

Satish Balay <balay at mcs.anl.gov> writes:
> Not sure how ccache helps with header dependencies. 

It returns the cached version if all the dependencies (including
headers) are unchanged.

> One can add in the dependencies to the makefile
>
> femex1.o: femex1.cpp lists.h shapes.h
> shapes.o: shapes.cpp shapes.h

This is an insane maintenance burden that is doomed to be eternally
incorrect and out of date.

You can generate correct header dependencies using the -MMD option (or
variants for other compilers; defined as C_DEPFLAG in PETSc makefiles
and used by gmakefile).  It's simple; why not do it right?
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