[Bug middle-end/38851] [4.4 regression] Compiler warns about uninitialized variable that is an object with a constructor

["bangerth at dealii dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from bangerth at dealii dot org  2009-01-23 19:31 -------
I see this as well. It triggers a lot when using boost::graph which
uses empty classes as tags all over the place. A simple case with
boost::graph would be this:
--------------------------
#include <boost/graph/adjacency_list.hpp>

using namespace boost;
adjacency_list<vecS, vecS, undirectedS, 
               property<vertex_color_t, default_color_type,
                        property<vertex_degree_t,int> > > g;

void create_graph () { add_edge(1,2, g); }
--------------------------

boost/graph/detail/adjacency_list.hpp: In function 'void create_graph()':
boost/graph/detail/adjacency_list.hpp:819: warning: 'p' may be used
uninitialized in this function
boost/graph/detail/adjacency_list.hpp:2210: note: 'p' was declared here

This problem makes -Wuninitialize pretty much useless for anyone who uses
boost::graph. I think it would be a shame if we shipped a compiler that
has a problem with this.

W.


-- 

bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mmitchel at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38851