[Bug c++/13377] [3.4 regression] unexpected behavior of namespace usage directive

[reichelt at gcc dot gnu dot org]

------- Additional Comments From reichelt at gcc dot gnu dot org  2005-08-31 
11:07 -------
For the testcase

  ==================================
  namespace N
  {
    int i;
  }

  int i;

  using namespace N;

  void foo() { i; }
  ==================================

we now get

  ambig4.C: In function 'void foo()':
  ambig4.C:10: error: use of 'i' is ambiguous
  ambig4.C:6: error:   first declared as 'int i' here
  ambig4.C:3: error:   also declared as 'int N::i' here
  ambig4.C:10: error: 'i' was not declared in this scope

Btw, this is the testcase which was a regression from GCC 3.3.x.

For the testcase

  ==================================
  namespace N
  {
    namespace M {}
  }

  namespace M {}

  using namespace N;
  using namespace M;
  ==================================

we now get (since the patch for PR23586 is also in place):

  ambig5.C:13: error: use of 'M' is ambiguous
  ambig5.C:10: error:   first declared as 'namespace M { }' here
  ambig5.C:7: error:   also declared as 'namespace M { }' here
  ambig5.C:13: error: 'M' is not a namespace-name
  ambig5.C:13: error: expected namespace-name before ';' token

This is still a little suboptimal (first we say it's ambiguous,
then we say it's not declared/not a namespace-name), but I think
the user can figure out the problem now.

So this is fixed on mainline and the 4.0 branch.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |http://gcc.gnu.org/ml/gcc-
                   |                            |patches/2005-
                   |                            |08/msg01717.html
            Summary|unexpected behavior of      |[3.4 regression] unexpected
                   |namespace usage directive   |behavior of namespace usage
                   |                            |directive
   Target Milestone|---                         |3.4.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13377