[Bug target/44954] New: exception ignores catch-clause when using a variable for the message

[mwglass at sandia dot gov]

I believe this is related to Bug #43493 

I cannot catch exceptions if a variable (non-static) is use for the message...

Using the following program:

#include <cstdlib>
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
using namespace std;

void generateException(int whichException);

int main(int argc, char ** argv) {
    for (int i=1; ; i++) {  // Loop forever
        try {
            cout << i;
            generateException(i);
        } catch (runtime_error rex) {
            cout << "    Catching: runtime_error - " << rex.what() << endl;
        } catch (...) {
            cout << "    ERROR: Nobody caught this!" << endl;
        }
    }     
    return 0;
}

void generateException(int whichException) {
    switch (whichException) {
    case 1:
        cout << "  Throwing runtime_error (1)" << endl;
        throw runtime_error( "a comment" );
        break;
    case 2:
        cout << "  Throwing runtime_error (2)" << endl;
        {
        static string msg( "a comment" );
        throw runtime_error( msg );
        }
        break;
    case 3:
        cout << "  Throwing runtime_error (3)" << endl;
        {
        string msg( "a comment" );
        throw runtime_error( msg );
        }
        break;
    case 4:
        cout << "  Throwing runtime_error (4)" << endl;
        {
        std::ostringstream msg ;
        msg << "a comment" ;
        throw runtime_error( msg.str() );
        }
        break;
    default:
        cout << "  Throwing up" << endl;
        exit(0);
    }
    return;
}



When I build with apple's g++ (4.2.1) or intel 11.1 icpc C++ compilers I get
the following expected output:

1  Throwing runtime_error (1)
    Catching: runtime_error - a comment
2  Throwing runtime_error (2)
    Catching: runtime_error - a comment
3  Throwing runtime_error (3)
    Catching: runtime_error - a comment
4  Throwing runtime_error (4)
    Catching: runtime_error - a comment
5  Throwing up


However, when I compile with gcc 4.3 or 4.4 installed with macports 1.9.1 I
get:

1  Throwing runtime_error (1)
    Catching: runtime_error - a comment
2  Throwing runtime_error (2)
    Catching: runtime_error - a comment
3  Throwing runtime_error (3)
Abort trap


I also tried building gcc44 with the --without-system-libunwind configure flag
and also got the same behavior.

My system configuration is:

MacPro 2x2.93GHz quad-core xeon
MacOSX 10.6.4
Xcode 3.2.3
MacPorts 1.9.1


-- 
           Summary: exception ignores catch-clause when using a variable for
                    the message
           Product: gcc
           Version: 4.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mwglass at sandia dot gov
 GCC build triplet: 86_64-apple-darwin10
  GCC host triplet: 86_64-apple-darwin10
GCC target triplet: 86_64-apple-darwin10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44954