[Bug c++/12697] Redundant duplicate error message

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=12697

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |msebor at gcc dot gnu.org
      Known to work|                            |7.0
         Resolution|---                         |FIXED
      Known to fail|                            |3.3, 4.5.3, 4.8.3, 4.9.3,
                   |                            |5.3.0, 6.3.0

--- Comment #10 from Martin Sebor <msebor at gcc dot gnu.org> ---
Today's top of trunk (GCC 7) prints the following single error message followed
by four distinct notes.  There is no duplication there (6.3 still prints a
duplicate message).  Resolving as fixed.

$ cat t.C && gcc -S -Wall -Wextra -Wpedantic t.C
void Foo(signed char, signed char);
void Foo(unsigned char, unsigned char);

void Foo(int, int);
void Foo(unsigned int, unsigned int);

int main() {
  unsigned char u;
  signed char i;
  Foo(u, i);
}
t.C: In function ‘int main()’:
t.C:10:11: error: call of overloaded ‘Foo(unsigned char&, signed char&)’ is
ambiguous
   Foo(u, i);
           ^
t.C:1:6: note: candidate: void Foo(signed char, signed char)
 void Foo(signed char, signed char);
      ^~~
t.C:2:6: note: candidate: void Foo(unsigned char, unsigned char)
 void Foo(unsigned char, unsigned char);
      ^~~
t.C:4:6: note: candidate: void Foo(int, int)
 void Foo(int, int);
      ^~~
t.C:5:6: note: candidate: void Foo(unsigned int, unsigned int)
 void Foo(unsigned int, unsigned int);