[Bug c++/17459] New: Spurious message when forgetting parentheses on call of member

["bangerth at dealii dot org" <gcc-bugzilla@gcc.gnu.org>]

(This is a spin-off from PR 17456) 
 
Take this code: 
----------------- 
struct S { 
  void foo(); 
  void bar() { foo; } 
}; 
----------------- 
Sure, the code looks odd: someone probably wanted to write foo() but 
forgot the parentheses. But I would think it is valid: we take a reference 
to the function S::foo and discard the result of this statement. But 
we get an error from gcc instead: 
 
g/x> /home/bangerth/bin/gcc-3.5-pre/bin/c++ -c x.cc 
x.cc: In member function `void S::bar()': 
x.cc:3: error: statement cannot resolve address of overloaded function 
 
That strikes me as completely odd and wrong: first, I think there shouldn't 
be an error in the first place; second, we certainly have no overloads 
here, so the message's intent is completely puzzling to me. Note that  
gcc2.95 printed this instead: 
 
g/x> /home/bangerth/bin/gcc-2.*/bin/c++ -c x.cc 
x.cc: In method `void S::bar()': 
x.cc:3: invalid use of member (did you forget the `&' ?) 
 
icc accepts the code without any warning or error. 
 
 
No, for comparison, think of the case where the two functions are 
non-members: 
------------------ 
void foo(); 
void bar() { foo; } 
------------------ 
Now we get 
 
g/x> /home/bangerth/bin/gcc-3.5-pre/bin/c++ -c x.cc 
x.cc: In function `void bar()': 
x.cc:2: warning: statement is a reference, not call, to function `foo' 
 
That makes more sense, and should have been what we get for the 
member case as well. 
 
W.

-- 
           Summary: Spurious message when forgetting parentheses on call of
                    member
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bangerth at dealii dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17459