What OCaml version is this compatible with?

[aantron]

What OCaml version is this compatible with?

[cristianoc]

^ that's an old version of the ppx, let me try to update

[aantron]

It should be compatible with every OCaml version from 4.02.0 on (4.02.3 because of Dune). At first glance, that log doesn't look related to Bisect. My guess is that this has something to do with recent Dune trying to build a secondary compiler.

[aantron]

Going to try it locally with a clean esy installation.

[cristianoc]

Trying straight dune w/o esy (from opam switch 4.06.1):

cristianoc-mbp1:bisect-starter-esy cristianoc$ BISECT_ENABLE=yes dune build ./tester.exe
         ppx hello.pp.ml (exit 2)
(cd _build/default && .ppx/47e007fefa63695257b4d9874e3138b7/ppx.exe --conditional --cookie 'library-name="hello"' -o hello.pp.ml --impl hello.ml --dump-ast)
Fatal error: exception Arg.Bad(".ppx/47e007fefa63695257b4d9874e3138b7/ppx.exe: unknown option '--conditional'.\nppx.exe [options] [<files>]\n  --as-ppx                  Act as a -ppx rewriter\n  --as-pp                   Shorthand for: --dump-ast --embed-errors\n  --dump-ast                Output a binary AST instead of source code\n  --null                    Output nothing, just report errors\n  -o FILE                   Output to this file instead of the standard output\n  --intf FILE               Treat FILE as a .mli file\n  --impl FILE               Treat FILE as a .ml file\n  --embed-errors            Embed error reported by rewriters into the AST\n  --print-transformations   Print registered transformations in their order of executions\n  --cookie NAME=EXPR        Set the cookie NAME to EXPR\n  -exclude <pattern>        Exclude functions matching pattern\n  -exclude-file <filename>  Exclude functions listed in given file\n  -mode {safe|fast|faster}\n                            Ignored\n  -conditional              Do not instrument unless environment variable BISECT_ENABLE is YES\n  -no-comment-parsing       Do not parse source files for BISECT-* comments\n  -help                     Display this list of options\n  --help                    Display this list of options\n")
cristianoc-mbp1:bisect-starter-esy cristianoc$ 

[cristianoc]

$ dune --version
2.2.0

[aantron]

Trying straight dune w/o esy (from opam switch 4.06.1):

The error in this case is probably due to not upgrading Bisect_ppx to 2.0.0. The help output is from a pretty old version.

[cristianoc]

OK upgrading worked.
Then moved to the same procedure, of avoiding esy, on the original project, genType, and it worked.

The issue can be closed, unless you want to debug dune-esy interactions.

[aantron]

Good, I will close this in favor of esy/esy#1062. My local build also failed with an error. It is a different error, but it probably has the same underlying cause. I commented at the esy issue about it.

[aantron]

Another option besides avoiding esy is using an earlier Dune version, since Bisect_ppx is compatible with any version of Dune down to Dune 1.0.0.