Compiling the following code snippet with "-Wall -O3" using mainline
===============================================
#include<vector>
#include<list>
std::vector<std::list<int>::iterator> v(1);
===============================================
I get the following warning:
/long_path/stl_construct.h: In function 'void
__static_initialization_and_destruction_0(int, int)':
/long_path/stl_construct.h:81: warning: 'SR.133' is used uninitialized in this
function
Apart from the strange variable name 'SR.133' the warning seems to be
justified as the default constructor of _List_iterator does not initialize
the pointer _M_node. _List_const_iterator has the same problem.
The following patch fixes the problem for me.
I haven't done bootstrapping and regtesting, though.
===================================================================
--- libstdc++-v3/include/bits/stl_list.h 19 Nov 2004 12:44:09 -0000
1.45
+++ libstdc++-v3/include/bits/stl_list.h 18 Jan 2005 18:49:06 -0000
@@ -119,7 +119,8 @@ namespace _GLIBCXX_STD
typedef _Tp* pointer;
typedef _Tp& reference;
- _List_iterator() { }
+ _List_iterator()
+ : _M_node() { }
_List_iterator(_List_node_base* __x)
: _M_node(__x) { }
@@ -195,7 +196,8 @@ namespace _GLIBCXX_STD
typedef const _Tp* pointer;
typedef const _Tp& reference;
- _List_const_iterator() { }
+ _List_const_iterator()
+ : _M_node() { }
_List_const_iterator(const _List_node_base* __x)
: _M_node(__x) { }
===================================================================
--
Summary: [4.0 regression] Warning using list iterators
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P2
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: reichelt at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19510
