More valgrind integration. Vector objects keep displaced pointers

to vector data; they point to element 0 which is actually the third
element of the vector. If an object is only referenced by interior
pointers, Valgrind reports it as possibly leaked. This change
conditionally adds a pointer to the true start of the vector,
if Valgrind support is enabled.

1 files changed, 3 insertions, 0 deletions

diff --git a/lib.h b/lib.h
index b8948351..5f0df256 100644
--- a/lib.h
+++ b/lib.h
@@ -108,6 +108,9 @@ struct vec {
   /* vec[-2] is allocated size */
   /* vec[-1] is fill pointer */
   val *vec;
+#ifdef HAVE_VALGRIND
+  val *vec_true_start;
+#endif
 };
 
 /*