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Date: Tue, 07 Feb 2006 00:26:00 -0000
Subject: [Bug c++/26143]  New: [4.0 Regression] wrong code when returning a function pointer
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The following testcase causes a segfault when compiled with 4.0.3 20060206
(with no optimizations).  gcc-3.3, 3.4, and 4.1 all seem to work fine with this
code.
---------

#include <iostream>

std::string exception_to_debug_string(const std::exception & e)
{
    return std::string("hey now");
}

class DebugStringHolder
{
    public:
        std::string (*get()) (const std::exception &) const
        {
            return &exception_to_debug_string;
        }
};

static DebugStringHolder _instance;

int
main(int, char * argv[])
{
      try
      {
          throw std::exception();
      }
      catch (std::exception &e)
      {
          std::cout << (_instance.get())(e) << std::endl;
      }
}


Results with 4.0:
halcyon@birdbath ~ $ ./a.out 

*** glibc detected *** free(): invalid pointer: 0xb7e6cfe8 ***
Aborted


Results with 4.1:
halcyon@birdbath ~ $ ./a.out 
hey now

On 4.1 it seems it was fixed by pr #19317


-- 
           Summary: [4.0 Regression] wrong code when returning a function
                    pointer
           Product: gcc
           Version: 4.0.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: halcy0n at gentoo dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26143