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Date:      Wed, 09 Apr 2008 09:39:09 -0700
From:      Yuri <yuri@rawbw.com>
To:        freebsd-hackers@freebsd.org
Subject:   C++ exceptions are broken in FreeBSD with gcc-compiled code?
Message-ID:  <47FCF12D.3070902@rawbw.com>
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I am unable to make a C++ program to catch an exception using the the 
system g++ compiler.

 > cat exc.C
#include <iostream>
#include <string>
using namespace std;

int main() {
  try {
    throw string("String");
  } catch (string s) {
    cout << "Caught an exception \"" << s << "\"\n";
  }
}


* Failed attempts with system compiler (using /lib/libgcc_s.so.1 and 
/usr/lib/libstdc++.so.6):
 > echo $LD_LIBRARY_PATH

 > g++ -fexceptions -o exc exc.C
 > exc
Exception raised: Memory allocation failure!
 > g++ -pthread -fexceptions -o exc exc.C
 > exc
Exception raised: Memory allocation failure!

* Succeeded attempt with gcc-4.3.0 and -pthread option (using 
/usr/local/gcc-4.3.0/lib/libgcc_s.so.1 and 
/usr/local/gcc-4.3.0/lib/libstdc):
 > echo $LD_LIBRARY_PATH
/usr/local/gcc-4.3.0/lib
 > /usr/local/gcc-4.3.0/bin/g++ -pthread -fexceptions -o exc exc.C
 > exc
Caught an exception "String"

* Failed attempt with gcc-4.3.0 without -pthread option (using 
/usr/local/gcc-4.3.0/lib/libgcc_s.so.1 and 
/usr/local/gcc-4.3.0/lib/libstdc):
 > echo $LD_LIBRARY_PATH
/usr/local/gcc-4.3.0/lib
 > /usr/local/gcc-4.3.0/bin/g++ -fexceptions -o exc exc.C
 > exc
Abort trap: 6

So exceptions *only* work with new gcc-4.3.0 and -pthread option.
Is this a known issue?

 > g++ --version
g++ (GCC) 4.2.1 20070719  [FreeBSD]
 > uname -a
FreeBSD xxx.xxx.xxx 7.0-STABLE FreeBSD 7.0-STABLE #5: Thu Feb 28 
03:58:20 PST 2008     yuri@xxx.xxx.xxx:/usr/obj/usr/src/sys/GENERIC  i386

Yuri

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