Can't install brr in windows

[davesnx]

Hey @dbuenzli

I started using brr and it's great, thanks for the effort. It's not a blocker for my project, but I still wanted to report it just in case there's something broken for Windows users.

I'm using esy but I believe have not much to do here, but when building brr in Windows breaks with the following: https://github.com/davesnx/query-json/runs/5175859022?check_suite_focus=true#step:10:32

Brr version: 0.0.2
esy: 0.6.10

[dbuenzli]

I don't know. I'm not familiar with esy.

But I don't think there should be a particular particular problem on windows. brr has no system dependencies.

You may want to check with the people in charge of esy's package repository.

[dbuenzli]

I had a closer look, roughly I suspect that esy is unable to create the _build directory. This seems to lead to the ocamlbuild plugin being created in the source tree, which leads to ocamlbuild hygiene violation.

I don't think the error is on this side. Feel free to reopen with further details if you think it is.

[Et7f3]

brr is pulled directly from opam repository: https://github.com/davesnx/query-json/blob/753f4f3c0386907e453cdba6ce6f38e79be668f7/esy.lock/index.json#L1318-L1348

esy expose DUNE_BUILD_DIR for dune to get a writable folder.
Where is this folder created so the call can be adapted.

[dbuenzli]

This folder is created by ocamlbuild.

[ManasJayanth]

This issue is only seen in ocamlbuild 0.14.1 and not on 0.14.0

[dbuenzli]

Not sure exactly what changed, tut this, in the new release, seems to deal with folders ocaml/ocamlbuild#302 you may want to check that.

These CI systems, without access to the build dir, make it hard to see what happens and what the problem is exactly. I think you should try to reproduce that on a machine and look around.

[dbuenzli]

Keep an eye on this discussion ocaml/ocamlbuild#316