5.2.0~alpha1: ocamlc -pack changed the expected naming convention for the cmi files

[kit-ty-kate]

The following test case works with OCaml 5.1 but fails with OCaml 5.2:

touch test.ml test.mli

ocamlc -c -o test.cmi test.mli
ocamlc -g -c -o test.d.cmo test.ml
ocamlc -g -pack -o pack.d.cmo test.d.cmo

with the following error message:

Error: I/O error: test.d.cmi: No such file or directory

I'm not seeing any related items in the changelog of 5.1.0~alpha1 so i believe this is an unexpected regression.

The test-case shown above can be seen with build-systems such as ocamlbuild.

[gasche]

My money is on #12389 and #12545.

[lthls]

There's no -for-pack involved ? I'm very much convinced that we shouldn't support the sequence of compilation commands shown above.
I'll try to look at ocamlbuild's code and see if I can make a patch.
Is there a specific package I can use to reproduce the error ?

[kit-ty-kate]

There's no -for-pack involved ?

there is, i just wanted to make the test-case here as short as possible.

Is there a specific package I can use to reproduce the error ?

yes, i originally noticed this issue in Snowflake.0.02.03