libstdc++.so: undefined reference to

[lulu he]

2010/6/10 lulu he <loloseed@gmail.com>:
> 2010/6/10 lulu he <loloseed@gmail.com>:
>> 2010/6/9 Ian Lance Taylor <iant@google.com>:
>>> lulu he <loloseed@gmail.com> writes:
>>>
>>>> I made a mistake, The error message is :
>>>> /usr/local/lib64/libstdc++.so: undefined reference to
>>>> '_Unwind_GetIPInfo@GCC_4.2.0'
>>>>
>>>> and I soft link /usr/local/lib64/libstdc++.so TO
>>>> /usr/local/gcc43/lib64/libstdc++.so,
>>>> so it gcc43 is using the libstdc++.so in gcc43/lib64.
>>>> ...
>>>
>>> Please reply to the mailing list, not just to me.
>>>
>>> The symbol Unwind_GetIPInfo@GCC_4.2.0 should be defined in
>>> libgcc_s.so.  Perhaps you are somehow picking up the wrong version of
>>> that library.
>>>
>>> Ian
>>>
>>
>> Hi, lan
>>
>> That's right.
>> g++ search .so in the /usr/local/lib64, instead of ..../gcc-4.3.3/lib64 ,
>> So I soft link all the .so in the /usr/local/lib64 TO  ..../gcc-4.3.3/lib64 ,
>> and "g++ -o hello hello.cpp" works right now.
>>
>> What an awkward method!
>> I have to soft link /usr/local/lib64/*.so back again if I wanna use
>> another gcc version!
>>
>> Do u have another better solution to tell gcc search to search
>> "..../gcc-4.3.3/lib64" directory by a global setting,
>> not by "-L" option??
>>
>
> I have soft link /usr/local/lib64/libgcc_s.so TO
> /usr/local/gcc-4.3.3/lib64/libgcc_s.so,
> and
> soft link /usr/local/lib64/libstdc++.so TO
> /usr/local/gcc-4.3.3/lib64/libstdc++.so
> but error is still reported:
> /usr/local/lib64/libstdc++.so: undefined reference to
> '_Unwind_GetIPInfo@GCC_4.2.0'
>


Hi lan,

I use the nm command:
nm libstdc++.so |grep _Unwind_GetIPInfo ,
it output "U _Unwind_GetIPInfo@GCC_4.2.0"

but
nm libgcc_s.so |grep _Unwind_GetIPInfo ,
it output "U _Unwind_GetIPInfo"

that doesn't match , I doubt the error is here???

How i can fix that?

Thanks.