[Bug c++/12397] New: 3.4 regression: two-stage name lookup (?) argument shadowed by global type

["jan at etpmod dot phys dot tue dot nl" <gcc-bugzilla@gcc.gnu.org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12397

           Summary: 3.4 regression: two-stage name lookup (?) argument
                    shadowed by global type
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jan at etpmod dot phys dot tue dot nl
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu

struct foo { }; 
 
template <typename T> struct bar 
{ 
    bar(){} 
    int i; 
    bar (const bar<T>& foo) : i (foo.i) {} 
}; 
 
int main() 
{ 
        bar<int> b1; 
        bar<int> b2(b1); 
} 
 
With gcc-head (today) this gives: 
 
/usr/local/gcc-head/bin/g++ t.cpp 
t.cpp: In copy constructor `bar<T>::bar(const bar<T>&)': 
t.cpp:7: error: 'struct foo' has no member named 'i' 
 
Observations: 
 
It seems that in line 7 the compiler tries to access the member i 
of the global struct foo, since: 
 
1) removing struct foo solves the problem 
2) after adding a member 'int i' to struct foo the code compiles (!) 
   a member of a non-existant object seems to be accessed then. 
 
The equivalent code without templates compiles fine. 
 
Previous gcc-releases compile this code without problems. 
 
I re-read 14.6 just to be sure but assume (hope!) that this is a compiler bug. It maybe remotely 
related to the weirdness of PR12370. 
 
/usr/local/gcc-head/bin/g++ -v 
Reading specs from /usr/local/gcc-head/lib/gcc/i686-pc-linux-gnu/3.4/specs 
Configured with: ../gcc-head/configure --prefix=/usr/local/gcc-head --enable-lan 
guages=c,c++ : (reconfigured)  : (reconfigured)  : (reconfigured) 
Thread model: posix 
gcc version 3.4 20030925 (experimental)