You are correct. However, you can still add it explicitly to the command line with g++ (if you're using gcj, then I'm not sure). For example, g++ -o prog file.cpp -lstdc++ -lsomeotherlib Now, if you do an 'ldd' on 'prod', you should see libstdc++ before libsomeotherlib. Lyle -----Original Message----- From: Ajay Bansal [mailto:abansal@xxxxxxxxxxxxx] Sent: Thursday, September 04, 2003 10:16 AM To: gcc-help@xxxxxxxxxxx Subject: RE: Same internal function name in libstdc++.so.5 and libjvm.so But I don't _link_ with libstdc++ explicitly!!!!!!!!!!!!!!!!!!!!!!! It is linked implicitly by g++ compiler. (Am I correct??) -----Original Message----- From: lrtaylor@xxxxxxxxxx [mailto:lrtaylor@xxxxxxxxxx] Sent: Thursday, September 04, 2003 9:39 PM To: abansal@xxxxxxxxxxxxx; gcc-help@xxxxxxxxxxx Hi, Can you change your link line so that libstdc++ is linked to before libjvm? If I understand correctly, it should get the function our of the first library linked to that defines it (I could be wrong, though...) Lyle Taylor -----Original Message----- From: Ajay Bansal [mailto:abansal@xxxxxxxxxxxxx] Sent: Thursday, September 04, 2003 5:17 AM To: gcc-help@xxxxxxxxxxx Subject: Same internal function name in libstdc++.so.5 and libjvm.so Hi All We are facing a "same function name" issue in two different libraries on Linux. My program is linked with both libstdc++ and libjvm. I am using gcc 3.2.1 on Linux. My code has following line : dynamic_cast<CSObject*>(m_unresolved)->WriteObject(lpszSString); Which dumps core. As it was not very clear why this piece of code can give a dump, I changed the code as follows: if ( dynamic_cast<CSObject*>(m_unresolved)) dynamic_cast<CSObject*>(m_unresolved)->WriteObject(lpszSString); Now core comes while executing "if" statement. I have checked for validity of pointers "m_unresolved" and "lpszSString". Both are valid. On Linux, with gcc 3.2.1, dynamic_cast internally calls function "__dynamic_cast". Problem is - this function is present both in libstdc++.so.5 and libjvm.so. In our code, function from libjvm is being called. If I change dynamic_cast to simple C style cast, everything works fine. (nm for libstdc_++ and libjvm is given below) ---------------------------------------- [abansal@linux2 lib]$ nm -A *.so.* |grep __dynamic libstdc++.so.5:00051bc0 T __dynamic_cast .so.5.0.1:00051bc0 T libstdc++__dynamic_cast [abansal@linux2 lib]$ nm /usr/j2sdk1.4.1_02/jre/lib/i386/server/libjvm.so |grep __dynamic 00485c34 T __dynamic_cast ---------------------------------------- Changing all dynamic_casts to simple C style casts in the code solves the issue, but I know that that is undesirable. Can somebody please suggest us what should we do in this case? Regards Ajay
