[dune] Move to Dune 1.10, use coq.pp directive.

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.

1 files changed, 4 insertions, 4 deletions

diff --git a/dev/doc/build-system.dune.md b/dev/doc/build-system.dune.md
index 372e40a0b7..37c6e2f619 100644
--- a/dev/doc/build-system.dune.md
+++ b/dev/doc/build-system.dune.md
@@ -52,7 +52,7 @@ order to use them, do:
 
 ```
 $ make -f Makefile.dune voboot                # Only once per session
-$ dune exec dev/shim/coqtop-prelude
+$ dune exec -- dev/shim/coqtop-prelude
 ```
 
 or `quickide` / `dev/shim/coqide-prelude` for CoqIDE. These targets
@@ -108,14 +108,14 @@ automatically.
 You can use `ocamldebug` with Dune; after a build, do:
 
 ```
-dune exec dev/dune-dbg /path/to/foo.v
+dune exec -- dev/dune-dbg /path/to/foo.v
 (ocd) source dune_db
 ```
 
 or
 
 ```
-dune exec dev/dune-dbg checker Foo
+dune exec -- dev/dune-dbg checker Foo
 (ocd) source dune_db
 ```
 
@@ -130,7 +130,7 @@ For running in emacs, use `coqdev-ocamldebug` from `coqdev.el`.
 
 After doing `make -f Makefile.dune voboot`, the following commands should work:
 ```
-dune exec dev/shim/coqbyte-prelude
+dune exec -- dev/shim/coqbyte-prelude
 > Drop.
 # #directory "dev";;
 # #use "include_dune";;