How to build brr with b0?

Learning
1

Hi,

I’m currently trying to build and test brr, but I’m not familiar with the b0 build tool.

After reading the b0 manual, my attempt was as follows:

cd brr
opam switch create . 5.3.0 --deps-only # installing things...
opam install . b0 # install b0 on the local switch
eval $(opam env)
b0 # build the project

I encountered the following error:

[FAIL] [ocamlopt][2]: (b0 file log --id 21)
File "/home/naora/projects/brr/B0.ml", line 18, characters 19-21:
Error: Unbound value "(~/)"

b0: [ERROR] Could not compile B0 file /home/naora/projects/brr/B0.ml

I’m not sure what I’m doing wrong.

2

I believe you need the development version of b0 (which itself requires the development version of cmdliner). This worked for me:

opam pin --dev cmdliner
opam pin --dev b0
opam source --dev brr
cd brr
opam install --deps-only .
b0
3 Likes
3

Yes thanks @kit-ty-kate. As written in DEVEL.md in general my projects do depend on the development version of b0.

At the moment it’s a bit painful because I’m trying to dogfood and improve the upcoming cmdliner completion support so you also need a pin on cmdliner which may break a few important package you have in your switch like odoc or ocp-indent (but pinning their dev version aswell should do it).

1 Like
4

Thanks to both of you. I wasn’t aware of the --dev flag.