[Bug c++/15745] exception specification incorrectly changes the type of the exception thrown

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

------- Additional Comments From bangerth at dealii dot org  2004-06-01 15:27 -------
Confirmed. Here's a small testcase: 
------------------- 
typedef int IntArray[10]; 
IntArray i; 
 
void test_array() 
#ifdef TEST 
  throw (IntArray) 
#endif 
{ throw i; } 
 
 
int main () { 
    try { 
        test_array(); 
    } catch (IntArray) {} 
} 
------------------ 
 
We get 
g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ x.cc ; ./a.out  
g/x> /home/bangerth/bin/gcc-3.4-pre/bin/c++ x.cc -DTEST ; ./a.out  
terminate called after throwing an instance of 'int*' 
Aborted 
 
The point is that if we throw an exception that violates the exception 
specification, then it is converted into an unspec exception and we 
abort. However, since we can catch the exception that we throw in the  
main function if there is no exception specification on the function 
body, it seems as if the exception thrown is really of type IntArray 
and shouldn't violate the exception specification. I agree that this 
is confusing and looks like a bug in gcc associated with decaying 
arrays to pointers, though I'd like to solicit a second opinion on 
this. 
 
We get the same results for all gcc versions from 2.95 to mainline. 
 
W. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
      Known to fail|                            |2.95.3 3.3.1 3.0.4 3.4.0
                   |                            |3.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15745