I apologize if this is the wrong source [this link referred me to this email address http://gcc.gnu.org/onlinedocs/gcc-3.3.3/gcc/Service.html#Service ] but this issue is killing me... I've read through the manual pages on symbol versioning but I'm still confused... I have a vendor's shared library foo.so [the vendor claims it was built by gcc 3.2.0 & the nm output supports this claim] which has unresolved references to symbols that end with @GLIBCPP_3.2. When I try to use this vendor's library in a link command [gcc 3.2.3 ] that makes use of the 3.2.3 libstdc++.so.5.0.3 (the -v output shows the correct path), the vendor's unresolved references are not satisfied by the corresponding symbol in libstdc++.so - obviously because my libstdc++.so's symbols don't have the @GLIBCPP_3.2 suffix. Having read the http://gcc.gnu.org/onlinedocs/libstdc++/abi.txt page, I believe the vendor's library has symbol level versioning enabled. However, I'm assuming this versioning must be function of the gcc compiler as the source of the @GLIBCPP_3.2 being appended to the mangled signature of the symbols. How does the compiler know which suffix to apply to what symbols? I see free@@GLIBC_2.0 (makes sense to me as free() is a C API function) while others have GLIBCPP_3.2 [these are symbols of type U according to nm ] while still others have no suffix at all [none of the vendor's C++ API member functions have a suffix]. Is there a pragma which, if present in a library's header files, causes the suffix to be applied to the generated symbol? If my code uses a member function of a stdc++ class, why should the generated reference contain the suffix unless the compiler knows to or is the symbol declaration modified in the header context to contain the suffix?? I see in c++config.h the _GLIBCPP_SYMVER not define'd in our copy [the #undef _GLIBCPP_SYMVER is commented out] but the above questions still remain - how does gcc know which symbols to append the @GLIBCPP_ to when compiling my source code to object code which at run-time depends on the symbols matching those found in libraries such as libstdc++ ? Thanks for reading this long-winded question & for any insights/references to how this works. -steve *********************************************************************** Bear Stearns is not responsible for any recommendation, solicitation, offer or agreement or any information about any transaction, customer account or account activity contained in this communication. ***********************************************************************
