Problem going to GCC from ICC

[tmortime <akira666_ at hotmail dot com>]

We have been using the Intel C++ compiler for quite a while and have, for
various reasons, decided to switch to GCC. We were able to build pretty
easily but now experience pretty frequent crashes, usually in the form of an
invalid free. The following output is obtained. You'll notice the Valgrind
output doesn't appear to be from the same spot as what you get when in the
debugger, not sure why, but it all appears to be std::string related.
 
The offending line is this 
result += ife_print (&ife);
 
where result is a so called ChString which is our own String class, which
inherites from std::basic_string, and then defined as typedef String<char>
ChString.
 
the ife_print function signature returns an std::string object.
 
Any help in this matter would be greatly appreciated.
 
Regards,
-Tom
 
*** glibc detected *** ./netseq-linux: free(): invalid pointer: 0xb7d73a25
***
/lib/i686/nosegneg/libc.so.6[0x7fbd1d]
/lib/i686/nosegneg/libc.so.6(cfree+0x90)[0x7ff3d0]
/usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0x388ef1]
/usr/lib/libstdc++.so.6(_ZNSs4_Rep10_M_destroyERKSaIcE+0x1d)[0x365a6d]
/usr/lib/libstdc++.so.6(_ZNSs7reserveEj+0xa8)[0x3671c8]
/usr/lib/libstdc++.so.6(_ZNSs6appendERKSs+0x4d)[0x3675cd]
/usr/lib/libstdc++.so.6(_ZNSspLERKSs+0x24)[0x367654]
./netseq-linux[0x81a78b0]
./netseq-linux[0x819fd60]
...
 
And in the debugger:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 2325392 (LWP 24450)]
0x008038ac in memcpy () from /lib/i686/nosegneg/libc.so.6
(gdb) bt
#0  0x008038ac in memcpy () from /lib/i686/nosegneg/libc.so.6
#1  0x003665e4 in std::string::_Rep::_M_clone () from
/usr/lib/libstdc++.so.6
#2  0x00367168 in std::string::reserve () from /usr/lib/libstdc++.so.6
#3  0x003675cd in std::string::append () from /usr/lib/libstdc++.so.6
#4  0x00367654 in std::string::operator+= () from /usr/lib/libstdc++.so.6
#5  0x081a78b0 in NetToolsLinux::ifconfig (this=0x91b3938) at
NetToolsLinux.cpp:82
#6  0x0819fd60 in MachineImplLinux::ifconfig (this=0x91b38e8) at
MachineLinux.cpp:430
#7  0x0816fe1e in Machine::ifconfig (this=0x91b3944) at Machine.cpp:107
#8  0x082b5985 in SeqScr::InterfaceInfo::prepareReport (this=0xb7ecc0a8) at
InterfaceInfo.cpp:60
#9  0x082b5c55 in SeqScr::InterfaceInfo::dataUpdate (this=0xb7ecc0a8,
msgPackets=@0x91d0dc8) at InterfaceInfo.cpp:29
#10 0x0827a1d0 in SeqScr::ScriptExec::dataUpdate (this=0xb7e22430,
msgPackets=@0x91d0dc8) at ScriptExec.cpp:132
#11 0x08244339 in ITestElement::dataUpdate (this=0xb7e22430,
msgPackets=@0x91d0dc8) at ITestElement.cpp:301
#12 0x0820b794 in TestMaster::processCompletedPackets (this=0x91d0b04,
message=@0x91d0dc8) at TestMaster.cpp:390
#13 0x081b5324 in Controller::processCachedPackets (this=0x91d0b04) at
Controller.cpp:115
#14 0x081b5593 in Controller::onTimeout (this=0x91d0b04) at
Controller.cpp:41
#15 0x0832ab8e in APN::Task::iterate ()
#16 0x0832a61b in APN::Task::svc ()
#17 0x08475e7a in ACE_Task_Base::svc_run ()
#18 0x08488958 in ACE_Thread_Adapter::invoke ()
#19 0x0090b302 in start_thread () from /lib/i686/nosegneg/libpthread.so.0
#20 0x008643ae in clone () from /lib/i686/nosegneg/libc.so.6
 
And Valgrind:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 2325392 (LWP 24450)]
0x008038ac in memcpy () from /lib/i686/nosegneg/libc.so.6
(gdb) bt
#0  0x008038ac in memcpy () from /lib/i686/nosegneg/libc.so.6
#1  0x003665e4 in std::string::_Rep::_M_clone () from
/usr/lib/libstdc++.so.6
#2  0x00367168 in std::string::reserve () from /usr/lib/libstdc++.so.6
#3  0x003675cd in std::string::append () from /usr/lib/libstdc++.so.6
#4  0x00367654 in std::string::operator+= () from /usr/lib/libstdc++.so.6
#5  0x081a78b0 in NetToolsLinux::ifconfig (this=0x91b3938) at
NetToolsLinux.cpp:82
#6  0x0819fd60 in MachineImplLinux::ifconfig (this=0x91b38e8) at
MachineLinux.cpp:430
#7  0x0816fe1e in Machine::ifconfig (this=0x91b3944) at Machine.cpp:107
#8  0x082b5985 in SeqScr::InterfaceInfo::prepareReport (this=0xb7ecc0a8) at
InterfaceInfo.cpp:60
#9  0x082b5c55 in SeqScr::InterfaceInfo::dataUpdate (this=0xb7ecc0a8,
msgPackets=@0x91d0dc8) at InterfaceInfo.cpp:29
#10 0x0827a1d0 in SeqScr::ScriptExec::dataUpdate (this=0xb7e22430,
msgPackets=@0x91d0dc8) at ScriptExec.cpp:132
#11 0x08244339 in ITestElement::dataUpdate (this=0xb7e22430,
msgPackets=@0x91d0dc8) at ITestElement.cpp:301
#12 0x0820b794 in TestMaster::processCompletedPackets (this=0x91d0b04,
message=@0x91d0dc8) at TestMaster.cpp:390
#13 0x081b5324 in Controller::processCachedPackets (this=0x91d0b04) at
Controller.cpp:115
#14 0x081b5593 in Controller::onTimeout (this=0x91d0b04) at
Controller.cpp:41
#15 0x0832ab8e in APN::Task::iterate ()
#16 0x0832a61b in APN::Task::svc ()
#17 0x08475e7a in ACE_Task_Base::svc_run ()
#18 0x08488958 in ACE_Thread_Adapter::invoke ()
#19 0x0090b302 in start_thread () from /lib/i686/nosegneg/libpthread.so.0
#20 0x008643ae in clone () from /lib/i686/nosegneg/libc.so.6

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