[dune] Compile debug and checker printers.

As noted by Gäetan, we didn't compile these. We also provide a recipe
to run `ocamldebug`. Try (after a build):

```
dune exec dev/dune-dbg
(ocd) source dune_db
```

or

```
dune exec dev/dune-dbg checker
(ocd) source checker_dune_db
```

for the checker.

1 files changed, 25 insertions, 0 deletions

diff --git a/dev/dune b/dev/dune
new file mode 100644
index 0000000000..fd6c8cf32c
--- /dev/null
+++ b/dev/dune
@@ -0,0 +1,25 @@
+(library
+ (name top_printers)
+ (public_name coq.top_printers)
+ (synopsis "Coq's Debug Printers")
+ (wrapped false)
+ (modules :standard \ checker_printers)
+ (libraries coq.toplevel coq.plugins.ltac))
+
+(library
+ (name checker_printers)
+ (public_name coq.checker_printers)
+ (synopsis "Coq's Debug Printers [for the Checker]")
+ (wrapped false)
+ (flags :standard -open Checklib)
+ (modules checker_printers)
+ (libraries coq.checklib))
+
+(rule
+  (targets dune-dbg)
+  (deps dune-dbg.in
+        ../checker/main.bc
+        ../topbin/coqtop_byte_bin.bc
+        ; This is not enough as the call to `ocamlfind` will fail :/
+        top_printers.cma)
+  (action (copy dune-dbg.in dune-dbg)))