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RFA: another documentation fixlet for c++

This needs a doc review.

PR 9257 concerns the fact that "set print object on" does not work if
the object in question has no run-time type identification.  This patch
just adds a note to the manual to clarify this point.



2011-11-10  Tom Tromey  <>

	PR c++/9257:
	* gdb.texinfo (Print Settings): Add an extra note about the need
	for a vtable.

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 1423b07..9e2fa38 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -8372,7 +8372,10 @@ Display the encoding style currently in use for decoding C@t{++} symbols.
 @cindex display derived types
 When displaying a pointer to an object, identify the @emph{actual}
 (derived) type of the object rather than the @emph{declared} type, using
-the virtual function table.
+the virtual function table.  Note that the virtual function table is
+required---this feature can only work for objects that have run-time
+type identification; a single virtual method in the object's declared
+type is sufficient.
 @item set print object off
 Display only the declared type of objects, without reference to the

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