Compiler libs does not provide .cmxs object files.

[vicuna]

Original bug ID: 7625
Reporter: @dbuenzli
Status: resolved (set by @xavierleroy on 2017-09-30T08:19:05Z)
Resolution: suspended
Priority: normal
Severity: feature
Version: 4.05.0
Category: configure and build/install
Monitored by: @gasche

Bug description

This makes it impossible to use them in ocamlnat.

[vicuna]

Comment author: @dbuenzli

Apparently it's not only compiler libs, both threads/threads.cmxs and vmthreads/threads.cmxs are also missing.

[vicuna]

Comment author: @xclerc

On a related note, while there is a CMXS Makefile variable,
most Makefiles don't use it. Is it on purpose, given that
the configure script sets CMXS to "cmxa" if dynlink is not
available?

[vicuna]

Comment author: @alainfrisch

vmthreads is bytecode only, and I believe that threads cannot be dynamically linked.

[vicuna]

Comment author: @xavierleroy

I'm not even sure it would work: most of the modules from compiler-libs libraries are already present in the ocamlnat executable, so we would need a way to hide entirely the ocamlnat versions of these modules. I'm skeptical this can be done easily. Marking this PR as "suspended".