Expected Behavior

Bytecode executables that depend on foreign libraries should use dynamic loading by default.

Actual Behavior

When defining a context in dune-workspace, Dune falls back to linking with -custom. Adding (disable_dynamically_linked_foreign_archives false) reproduces the normal behavior (as it was in Dune 2.3.1).

Reproduction

Extract this tarball and run dune build --verbose a.bc.
dune-custom-bug.tar.gz

Specifications

• Version of dune (output of dune --version): 2.4.0
• Version of ocaml (output of ocamlc --version): 4.08.1
• Operating system (distribution and version): macOS 10.15

Additional information

• Link to gist with verbose output (run dune with the --verbose flag):
  https://gist.github.com/corwin-of-amber/d8f4b9e811c77e1a4cbc5d7e32548977