Prepare code coverage infrastructure for the compiler

[chambart]

No description provided.

[hnrgrgr]

See the package ocaml-bisect in opam-flambda-repository-overlay.

It intruments the Flambda compiler with ppx_bisect, then run the OCaml testsuite, and eventually generate a coverage report.

OPAMROOT_ALT=${HOME}/.opam-flambda
opam init --root ${OPAMROOT_ALT} --compiler 4.03.0+flambda flambda-overlay https://github.com/OCamlPro/opam-flambda-repository-overlay.git
eval $(opam config --root ${OPAMROOT_ALT} env)
opam install --build-test ocaml-bisect
xdg-open $(ocamlfind query ocaml-bisect)/coverage/

The instrumented compiler is also installed as ocamlc-bisect.opt and ocamlopt-bisect.opt.

[lefessan]

Would it be possible to include the opam-flambda-repository-overlay GIT repo into this repo as a sub-directory, and still use it from OPAM ?
I am not fond of the multiplication of repositories, I prefer when everything related to the task force is included in the same repo..
Your opinion ?

[AltGr]

git doesn't allow cloning subdirs, and opam doesn't in general allow using a subdir of what was fetched. But we could have subdirs and advise to first git clone / git update and then use local repositories.