g++: Identifier-dependent namespace/using lookup bug

[Jens Maurer]

Hello,

I tried to compile the enclosed program with
gcc version 2.95.2 19991024 (release)
gcc version 2.96 20000214 (experimental)

on Linux kernel 2.2.13, glibc 2.1.2.

The error message was in both cases

using-decl.cc: In method `double A<int>::func1()':
using-decl.cc:35:   instantiated from here
using-decl.cc:25: `log' undeclared (first use this function)
using-decl.cc:25: (Each undeclared identifier is reported only once
using-decl.cc:25: for each function it appears in.)

However, the exact same usage with sin() works without any trouble
whatsoever.  Comment out "x.func1()" and it compiles.

Why does the compiler fail to find the symbol "log" in its symbol
table?

Jens Maurer


namespace N1
{
  extern double sin (double  __x);
  extern double log (double  __x);
}  

namespace N2 { 
  using ::N1::sin;
  using ::N1::log;
} 


template<class T>
class A {
public:
  double func2()
  {
    using N1::sin;
    return sin(2.0);
  }
  double func1()
  {
    using N1::log;
    return log(2.0);
  }
  
};


int main()
{
  A<int> x;
  x.func2();
  x.func1();
}