Dune can't compile on a ocaml-variants.4.14.1+msvc64c variant

[F-Loyer]

Dune can't compile on a ocaml-variants.4.14.1+msvc64c switch.

# ocamlc -output-complete-exe -w -24 -g -o .duneboot.exe -I boot unix.cma boot/libs.ml boot/duneboot.ml
# link: missing operand
# Try 'link --help' for more information.
# link: extra operand « /libpath:C:/Users/frede/AppData/Local/opam/4.14.1+msvc64c/lib/ocaml »
# Try 'link --help' for more information.
# ** Fatal error: Error during linking

In fact, any program can't be compiled by ocamlc -output-complete-exe which trigger a wrong MSVC link command. ocamlc without -output-complete-exe is ok.

I am using Microsoft Studio Community 2022.

[kit-ty-kate]

I’m not sure what opam (the tool) can do here. Could you open a ticket on dune or/and the compiler (4.14 is still maintained as it is an LTS) instead?

[F-Loyer]

Ok, a new ticket is opened. ocaml/ocaml#12944

[kit-ty-kate]

Looking at the answer there, could you show what the output of opam env --switch=4.14.1+msvc64c is?

[F-Loyer]

The issue can be closed.

It deals with a conflict between the linker link from MSVC and the Cygwin linkcommand. One just have to make sure the acurate PATH is used when using MSVC.

[kit-ty-kate]

Sorry for the lack of update, just to note that this should be fixed by #5832 slotted for the next beta