bizarre exception problem

[Jeremy Sanders <jss@xxxxxxxxxxxxx>]

Hi -

Maybe someone could tell me why this exception isn't caught? I'm not sure 
whether it's a compiler bug. It used to work under gcc-2.96 (RedHat). It's 
a snippet as I can't seem to get it to fail if I compile it by itself...

  void param::interpret_and_catch()
  {
    try {
      throw except_invalid_at_file("foo");
      interpret();
    }
    catch(const except_invalid_at_file e) {
      cerr << "Cannot open parameter file " << e() << "\n\n";
      show_autohelp();
    }
    catch(const except_returnstr e) {
      cerr << "Option " << e() << " invalid\n\n";
      show_autohelp();
    }
  }

where:

  class except
  {
  public:
  };

  class except_returnstr : public except
  {
  public:
    except_returnstr(const std::string& uswitch) : m_switch(uswitch) {}
    const std::string &operator()() const { return m_switch; }
  private:
    const std::string m_switch;
  };

  class except_undef_switch : public except_returnstr
  {
  public:
    except_undef_switch(const std::string &uswitch)
      : except_returnstr(uswitch) {}
  };



the code core when run. gdb shows

#0  0x41000c32 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x4103f989 in raise () from /lib/tls/libc.so.6
#2  0x41041342 in abort () from /lib/tls/libc.so.6
#3  0x00e3b727 in __cxxabiv1::__terminate(void (*)()) (
    handler=0x41041170 <abort>)
    at ../../../../gcc-3.2.1/libstdc++-v3/libsupc++/eh_terminate.cc:47
#4  0x00e3b774 in std::terminate() ()
    at ../../../../gcc-3.2.1/libstdc++-v3/libsupc++/eh_terminate.cc:57
#5  0x00e3b8e6 in __cxa_throw (obj=0x9853630, tinfo=0x0, dest=0)
    at ../../../../gcc-3.2.1/libstdc++-v3/libsupc++/eh_throw.cc:77
#6  0x08055197 in parammm::param::interpret_and_catch() (this=0xbfff8cc0)
    at param.cc:95


The compiler options are pretty standard (-O0 -g -Wall).

Thanks

Jeremy

--
Jeremy Sanders <jss@xxxxxxxxxxxxx>   http://www-xray.ast.cam.ac.uk/~jss/
X-Ray Group, Institute of Astronomy, University of Cambridge, UK.
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