Come up with better version for uncommitted snapshots

Instead of leaving it as .z we now take the date of the previous commit and
increment it by a second. The main benefit of doing it this way is that once
committed, the new version does not "jump back" behind .z.

1 files changed, 1 insertions, 0 deletions

diff --git a/build2/version/snapshot.hxx b/build2/version/snapshot.hxx
index b7e6dd7..15f4b59 100644
--- a/build2/version/snapshot.hxx
+++ b/build2/version/snapshot.hxx
@@ -18,6 +18,7 @@ namespace build2
     {
       uint64_t sn = 0;
       string id;
+      bool committed = false;
 
       bool
       empty () const {return sn == 0;}