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Replace make lib-ext with a configure-based check #4776

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merged 7 commits into from
Sep 3, 2021

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@dra27 dra27 commented Jul 29, 2021

make lib-ext is an artefact from the pre-Jbuilder days when it actually built .cma and .cmxa archives to be put into a separate lib directory. The workflow has never made sense since the switch to using jbuilder/dune vendored libraries for this.

This PR is on buy one, get two free:

  • Detection of C++ on Cygwin is fixed (or, more accurately, the detection when C++ is not present on Cygwin is fixed). It turns out this is not related, but I started with it because I thought it might be!
  • --without-dune is added to configure to allow disabling or forcing the use of dune from PATH. This is related. Default behaviour is unchanged: if you don't specify anything, Dune will be automatically built if it's missing.
  • --with-vendored-deps now replaces make lib-ext. By default, this gets enabled whenever the old lib-ext message would have been disabled. At the end of configure, sources are downloaded and extracted as required. It's all the same mechanism, it's only invocation which has altered, so full tarballs would use their local copies in the "download" phase, etc.

opam has always automatically built Dune if it was missing (even without
`make lib-ext`). This option adds support to force that by passing
`--without-dune` to configure, instructing `configure` to ignore any
dune binary in PATH.

`--with-dune` allows the opposite, forcing dune to be in PATH.

As a small debugging trick, `--with-dune=foo` allows `foo` to be used in
place of `dune`.
Related to an unreleased patch being backported to seq 0.1 and should
have been removed when seq 0.2 was adopted.
make lib-ext is an artefact of OPAM 1.2.2's build system, when it
actually did something. Since the switch to Jbuilder and then Dune, all
it does is set-up a source tree which is more appropriately done from
configure, whose job that is.
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