.vi files: .vo files without proofs

File format:
 The .vo file format changed:
   - after the magic number there are 3 segments. A segment is made of 3
     components: bynary int, an ocaml value, a digest.  The binary int
     is the position of the digest, so that one can skip the value without
     unmarshalling it
   - the first segment is the library, as before
   - the second segment is the STM task list
   - the third segment is the opaque table, as before
 A .vo file has a complete opaque table (all proof terms are there).
 A .vi file follows the same format of a .vo file, but some entries
 in the opaque table are missing.  A proof task is stocked instead.

Utilities:
 coqc: option -quick generates a .vi insted of a .vo
 coq_makefile: target quick to generate all .vi
 coqdep: generate deps for .vi files too
 votour: can browse .vi files too, the first question is which segment
         should be read
 coqchk: rejects .vi files

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/flags.mli b/lib/flags.mli
index 0b7adf33f3..f0b6766411 100644
--- a/lib/flags.mli
+++ b/lib/flags.mli
@@ -11,6 +11,8 @@
 val boot : bool ref
 
 val batch_mode : bool ref
+type compilation_mode = BuildVo | BuildVi
+val compilation_mode : compilation_mode ref
 
 val coq_slave_mode : int ref
 val coq_slaves_number : int ref