Fix compatibility with libargon2 20171227 and upgrade to Dune

dra27 commented 4 years ago

libargon2 20171227 switched the library to .so.n format but also bumped the ABI because Argon2id changed the signature of a argon2_encodedlen. Switch to loading libargon2.so.1, therefore - no attempt at compatibility, given that the release is 3 years old.
I've not added support for Argon2id, so the signature of Argon2.encoded_len (and Argon2.kind) haven't changed
examples/examples.ml was broken by various previous API changes - it now builds again
Removed unused dependency on ppx_deriving and updated the opam file to 2.0
Upgraded the build system to Dune (Makefile targets basically unchanged make examples now actually runs the example program instead)
Documentation therefore builds with odoc, and links (and the upload_doc) target should still work

Installed layout should be identical to the previous topkg version.

There might be a follow-up now that I can switch back to Windows...

dra27 commented 4 years ago

This would be a good excuse to release and fix #2 at the same time!

Khady commented 4 years ago

thanks

Khady / ocaml-argon2