The `clean` doesn't appear to serve a purpose. Make already does
dependency tracking, so if files are out of date they will be rebuilt.
The `clean` rule does however cause problems when the test executable
already exists. In that case it will delete outputs, including the test
executable, and then fail. By the time the test executable was deleted,
it was already determined that it was up to date, and so does not get
rebuilt. You end up having to run the command twice, each time seesawing
between deleting outputs or generating outputs and running the tests.
This PR closes some gaps in the makefile. It follows GNU coding standards and conventions at https://www.gnu.org/prep/standards/standards.html. It is not specific to GNU, and most of the world follows it.
Daniel Stevens
Masadow
Jeffrey Walton
Lee Thomason
Thierry Lelegard
Felipe "Zoc" Silveira
numatrumpet
Bruno Dias
Guillermo A. Amaral