Hello.

This is a proposal for excercises:

1- create a new "povacca" git repository that is a subset of the
hsw2020-www repository, only including the povacca code.  Note: you
are expected to keep the "povacca/" subdir: moving code to the
top-level directory is possible but not trivial. Sure you can try if
you want.

2- add you own operations to povacca, but adding one or more op-*.c
files, and try to understand why it works, or why it doesn't work.

3- explain why povacca.h declares "struct pv_oper pv_first[]" as
extern, and not "struct pv_oper *pv_first". If you try, please explain
why and how it fails. If you don't try, please guess why and how it would
fail.

4- use the elf-section trick, i.e. __attribute__((__section__("sth")))
to create an array of named items, that live in separate source files,
and a main program that lists them like this:

    for (....) printf(item->name);

Then, understand why it works. Optionally, first understand why
it doesn't work, then fix, finally understand why it works.