ocaml
opam depext support for macos
I wanted to switch from opam 2.0.X to opam 2.1.2, but the integrated depext still doesn't seem to support macOS:
opam install conf-pkg-config
[NOTE] External dependency handling not supported for OS family 'macos'.
You can disable this check using 'opam option --global depext=false'
The following actions will be performed:
β install conf-pkg-config 2
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><> π«
[ERROR] The compilation of conf-pkg-config.2 failed at "pkg-config --help".
#=== ERROR while compiling conf-pkg-config.2 ==================================#
# context 2.1.2 | macos/x86_64 | ocaml-option-flambda.1 ocaml-variants.4.13.1+options | https://opam.ocaml.org#73531078
# path ~/.opam/__coq-platform.2022.04.1~8.16+rc1~2022.09~preview1/.opam-switch/build/conf-pkg-config.2
# command ~/.opam/opam-init/hooks/sandbox.sh build pkg-config --help
# exit-code 71
# env-file ~/.opam/log/conf-pkg-config-16221-c99f60.env
# output-file ~/.opam/log/conf-pkg-config-16221-c99f60.out
### output ###
# sandbox-exec: execvp() of 'pkg-config' failed: No such file or directory
<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><> π«
ββ The following actions failed
β Ξ» build conf-pkg-config 2
ββ
βΆβ No changes have been performed
I wonder what the recommendation of the opam team for multi platform projects is. Should I stick with opam 2.0.X for the time being? Am I missing something?
# opam config report
# opam-version 2.1.2
# self-upgrade no
# system arch=x86_64 os=macos os-distribution=macos os-version=11.6
# solver builtin-mccs+glpk
# install-criteria -removed,-count[avoid-version,changed],-count[version-lag,request],-count[version-lag,changed],-count[missing-depexts,changed],-changed
# upgrade-criteria -removed,-count[avoid-version,changed],-count[version-lag,solution],-count[missing-depexts,changed],-new
# jobs 1
# repositories 4 (http), 3 (local) (default repo at 73531078)
# pinned 0
# current-switch __coq-platform.2022.04.1~8.16+rc1~2022.09~preview1
[NOTE] External dependency handling not supported for OS family 'macos'.
You can disable this check using 'opam option --global depext=false'
# ocaml:native true
# ocaml:native-tools true
# ocaml:native-dynlink true
# ocaml:stubsdir /Users/admin/.opam/__coq-platform.2022.04.1~8.16+rc1~2022.09~preview1/lib/ocaml/stublibs:/Users/admin/.opam/__coq-platform.2022.04.1~8.16+rc1~2022.09~preview1/lib/ocaml
# ocaml:preinstalled false
# ocaml:compiler 4.13.1+options+flambda
P.S.: the above was with a MacPorts machine. With Homebrew it appears to work.
I find this error message highly confusing. If it works in general, but there is an issue with MacPorts and/or Homebrew, the error message should state this.
opam detects the "distribution" of macOS (which package manager it has) by looking for specific commands:
https://github.com/ocaml/opam/blob/9b5873a0f712e5fd9f7c54a1c93972017518843a/src/state/opamSysPoll.ml#L96
As you can see here, it will detect macports if the port command is available.
How do you access macports on your installation?
Just 'port' works - it is installed in the usual location '/opt/local/bin/port'.
But it was a fresh VM. I can't exclude that I did e.g. install MacPorts in one terminal and then opam in another terminal which I opened before installing MacPorts.
Still I find the error message highly confusing. It should probably say:
External dependency handling for OS family 'macos' requires either MacPorts or Homebrew - neither could be found
instead of
External dependency handling not supported for OS family 'macos'
But it was a fresh VM. I can't exclude that I did e.g. install MacPorts in one terminal and then opam in another terminal which I opened before installing MacPorts.
ah indeed, then /opt/local/bin wouldn't be in $PATH and it wouldn't be found. Though opening a new terminal again should work (the distribution detection is dynamic)
I opened https://github.com/ocaml/opam/pull/5240 for your suggestion.
Thanks, I think we can close this - I just got confused by the error message.