c++/9924: [3.2/3.3/3.4 regression] Multiple using statements for builtin functions not allowed

[bangerth@dealii.org]

Old Synopsis: Multiple  using __gnu_cxx::llabs breaks compilation.
New Synopsis: [3.2/3.3/3.4 regression] Multiple using statements for builtin functions not allowed

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Mon Mar  3 19:47:23 2003
State-Changed-Why:
    Confirmed. The problem has nothing to do with namespace
    __gnu_cxx, but indeed something with builtins. This
    code also shows the problem:
    -------------------------
    namespace NS {
        void llabs(long long x);
    }
    
    namespace std {
        using NS::llabs;
        using NS::llabs;
    }
    ------------------
    g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ -c x.cc
    x.cc:7: error: `llabs' is already declared in this scope
    
    If llabs is renamed to foo, then the code compiles cleanly.
    This seems like a bug.
    
    The problem occurs with 3.2, 3.3, and 3.4 branches. It
    doesn't happen with 3.0.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9924