Allow to turn contrib/subtac into a (nat)dynlink'able plugin

Main issue was declare_summary being triggered too late in
subtac_obligations, hence the associated init_function was
_not_ being done by Lib.init(). Fixed for the moment by
an ad-hoc launch of this init_function in subtac_obligations.

In other plugins, this issue doesn't appear, since
init_function is mostly putting back some empty set into
a reference that was initially empty. No need to really
run init_function in this case. For future plugins, we will
nonetheless have to be careful about that.

Of course, the (ref Obj.magic) was not exactly helpful in
debugging this matter, see http://caml.inria.fr/mantis/view.php?id=4707
As said by Xavier, naughty naughty boys...

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@11877 85f007b7-540e-0410-9357-904b9bb8a0f7

1 files changed, 5 insertions, 1 deletions

diff --git a/library/summary.mli b/library/summary.mli
index 7f300a996..3e6375b0e 100644
--- a/library/summary.mli
+++ b/library/summary.mli
@@ -28,5 +28,9 @@ val section_unfreeze_summaries : frozen -> unit
 val module_unfreeze_summaries : frozen -> unit
 val init_summaries : unit -> unit
 
-
+(** Beware: if some code is dynamically loaded via dynlink after the
+    initialization of Coq, the init functions of any summary declared
+    by this code may not be run. It is hence the responsability of
+    plugins to initialize themselves properly.
+*)