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This completes a pure Dune bootstrap of Coq.
There is still the question if we should modify `coqdep` so it does
output a dependency on `Init.Prelude.vo` in certain cases.
TODO: We still double-add `theories` and `plugins` [in coqinit and in
Dune], this should be easy to clean up.
Setting `libs_init_load_path` does give a correct build indeed;
however we still must call this for compatibility?
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It is unfortunate that we cannot install coqide and Dune 2.5.0 in < 4.07.0
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See discussion in https://github.com/coq/bignums/issues/26 and #11476
We still disable it in developer fast builds as the speed up is
considerable, it can be enabled by just calling `./configure`
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We also workaround problem #11405 , however, this should be reverted
once the problem is fixed in OCaml upstream.
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This is the minimal set of changes requires for Coq to build under 2.0
mode. We may likely take advantage of some more new features.
Note that Dune 2.0 requires OCaml >= 4.06.0, OPAM allows to use Dune
in older versions as it will install a secondary compiler.
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"dev" was not implied, and this can cause the following issues:
--8<---------------cut here---------------start------------->8---
$ docker run --rm -it coqorg/base:latest
coq@…:~$ opam update
coq@…:~$ git clone https://github.com/coq/coq.git
Cloning into 'coq'...
coq@…:~$ cd coq
coq@…:~/coq$ opam pin add -n -k path coq .
[coq.8.10.1] synchronised from file:///home/coq/coq
coq is now pinned to file:///home/coq/coq (version 8.10.1)
# issue 1. opam picks the first version he finds for coq from repos…
coq@…:~/coq$ mv coq.opam foo.opam
coq@…:~/coq$ opam pin add -n -k path foo .
Package foo does not exist, create as a NEW package? [Y/n] y
[foo.~dev] synchronised from file:///home/coq/coq
foo is now pinned to file:///home/coq/coq (version ~dev)
# issue 2. if none is found, opam sticks to some "~dev" version…
--8<---------------cut here---------------end--------------->8---
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We use the `(coq.pp ...)` dune directive which will produce correct
error messages for `.mlg` files.
Unfortunately we cannot yet use the automatic opam generation features
of Dune 1.10, as this does require a fully native Dune build.
Dune 1.6-1.10 has quite a few other improvements that could be used by
Coq, for example for promote modes.
I have fixed a couple of documentation issues. `Drop` and `ocamldebug`
have been tested in this version.
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The OPAM build has been broken it seems since almost the beginning as
OPAM doesn't substitute variables in the almost undocumented
`build-env` form.
Packages built this way worked as Coq used a different method to
locate `coqlib`, however the value for `coqlib` was incorrect.
We set instead the right prefix using an explicit configure call.
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I copied this from Ralf Jung's submission to the Coq Package index,
let's see if it works.
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This reverts commit c4880effb91fab55c250a799cbceac9b04681db0, reversing
changes made to 65927c22bcad62e1bc9a28a57377d82eba215a2d.
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This is the first release that contains the type-safe grammar API.
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We need to update in Docker:
- dune to 1.4.0: as it honors `-p` on test stanzas
- dune-release to 1.1.0: support for OPAM 2.0 + fixes
This makes `dune-release distrib` / `dune-release opam pkg` work.
TODO: we need to figure out what is going on with the
versioning. Should we do `dune subst` on `pinned`?
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The Dune `release` profile is used by OPAM so that should cover the
testing.
We also update the dependencies:
- camlp5: 7.01 had some bugs regarding grammar; we could use 7.02,
however this version it is not in OPAM. So I guess that leaves us
with 7.03 again.
- lablgtk < 2.18.5 does not support OCaml >= 4.05.0.
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This is a hack to enable correct OPAM building, the medium-term plan
is to avoid having to set a prefix at configure time but instead using
a set of rules to locate the Coq library.
We use `(env_var ...)` in a dependency rule, which a feature of Dune 1.2
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Fixes #8431
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[Dune](https://github.com/ocaml/dune) is a compositional declarative
build system for OCaml. It provides automatic generation of
`version.ml`, `.merlin`, `META`, `opam`, API documentation; install
management; easy integration with external libraries, test runners,
and modular builds.
In particular, Dune uniformly handles components regardless whether
they live in, or out-of-tree. This greatly simplifies cases where a
plugin [or CoqIde] is checked out in the current working copy but then
distributed separately [and vice-versa]. Dune can thus be used as a
more flexible `coq_makefile` replacement.
For now we provide experimental support for a Dune build. In order to
build Coq + the standard library with Dune type:
```
$ make -f Makefile.dune world
```
This PR includes a preliminary, developer-only preview of Dune for
Coq. There is still ongoing work, see
https://github.com/coq/coq/issues/8052 for tracking status towards
full support.
## Technical description.
Dune works out of the box with Coq, once we have fixed some modularity
issues. The main remaining challenge was to support `.vo` files.
As Dune doesn't support custom build rules yet, to properly build
`.vo` files we provide a small helper script `tools/coq_dune.ml`. The
script will scan the Coq library directories and generate the
corresponding rules for `.v -> .vo` and `.ml4 -> .ml` builds. The
script uses `coqdep` as to correctly output the dependencies of
`.v` files. `coq_dune` is akin to `coq_makefile` and should be able to
be used to build Coq projects in the future.
Due to this pitfall, the build process has to proceed in three stages:
1) build `coqdep` and `coq_dune`; 2) generate `dune` files for
`theories` and `plugins`; 3) perform a regular build with all
targets are in scope.
## FAQ
### Why Dune?
Coq has a moderately complex build system and it is not a secret that
many developer-hours have been spent fighting with `make`.
In particular, the current `make`-based system does offer poor support
to verify that the current build rules and variables are coherent, and
requires significant manual, error-prone. Many variables must be
passed by hand, duplicated, etc... Additionally, our make system
offers poor integration with now standard OCaml ecosystem tools such
as `opam`, `ocamlfind` or `odoc`. Another critical point is build
compositionality. Coq is rich in 3rd party contributions, and a big
shortcoming of the current make system is that it cannot be used to
build these projects; requiring us to maintain a custom tool,
`coq_makefile`, with the corresponding cost.
In the past, there has been some efforts to migrate Coq to more
specialized build systems, however these stalled due to a variety of
reasons. Dune, is a declarative, OCaml-specific build tool that is on
the path to become the standard build system for the OCaml ecosystem.
Dune seems to be a good fit for Coq well: it is well-supported, fast,
compositional, and designed for large projects.
### Does Dune replace the make-based build system?
The current, make-based build system is unmodified by this PR and kept
as the default option. However, Dune has the potential
### Is this PR complete? What does it provide?
This PR is ready for developer preview and feedback. The build system
is functional, however, more work is necessary in order to make Dune
the default for Coq.
The main TODOs are tracked at https://github.com/coq/coq/issues/8052
This PR allows developers to use most of the features of Dune today:
- Modular organization of the codebase; each component is built only
against declared dependencies so components are checked for
containment more strictly.
- Hygienic builds; Dune places all artifacts under `_build`.
- Automatic generation of `.install` files, simplified OPAM workflow.
- `utop` support, `-opaque` in developer mode, etc...
- `ml4` files are handled using `coqp5`, a native-code customized
camlp5 executable which brings much faster `ml4 -> ml` processing.
### What dependencies does Dune require?
Dune doesn't depend on any 3rd party package other than the OCaml compiler.
### Some Benchs:
```
$ /usr/bin/time make DUNEOPT="-j 1000" -f Makefile.dune states
59.50user 18.81system 0:29.83elapsed 262%CPU (0avgtext+0avgdata 302996maxresident)k
0inputs+646632outputs (0major+4893811minor)pagefaults 0swaps
$ /usr/bin/time sh -c "./configure -local -native-compiler no && make -j states"
88.21user 23.65system 0:32.96elapsed 339%CPU (0avgtext+0avgdata 304992maxresident)k
0inputs+1051680outputs (0major+5300680minor)pagefaults 0swaps
```
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