I have a rather interesting situation and I'm wondering if any one has some ideas. I am building a linux shared library which uses boost and xerces, I have an application which I compile and run fine using gcc 4.1 which uses stdlibc++.so.6. I also have a requirement to create an interface for Labview 8.6 which is built using gcc 3.3 which uses stdlibc++.so.5. After some investigation I found that Labview would crash on any std::string concatenation because it was dynamically using the old stdlib(5). In a simplified test tool I statically linked the stdc++ lib using this really great page: http://www.trilithium.com/johan/2005/06/static-libstdc/ Everything worked great until I started adding my cots (boost and xerces) into the mix. For xerces I simply modified the xerces make file to statically link stdlib and (using gdb was able determine that) I get past all my xerces calls. However when I make call to boost lexical cast it still tries to use the dynamic std library 5: #0 0x00cab1a7 in std::string::data () from /usr/lib/libstdc++.so.5 #1 0x0362b479 in boost::detail::lexical_cast<int, std::string, false, char> (arg=@0x0, buf=0x0, src_len=0) at /usr/include/boost/boost_1_38_0/boost/lexical_cast.hpp:1149 #2 0x0362b500 in boost::detail::lexical_cast<int, std::string, false, char> (arg=Cannot access memory at address 0x8 ) at /usr/include/boost/boost_1_38_0/boost/lexical_cast.hpp:1159 Above is the stack trace immediately preceding my segmentation fault. One: I thought that lexical cast was built into hpp files and was compiled at my application compile time is that correct? Two: does any one know how to make the symbols from a .a (static library) file look in the encapsulating so's symbol table before the applications symbol table? Or can anyone point me at some information on symbol lookup precedence. Three: I'm considering including all of the generated object files from the included boost .a files in my make file rather than including the staticboost libraries themselves. Seem like a good idea? Any pitfalls? Four: any other Ideas? Below is the meat of my make file: g++ -g -static-libgcc -nodefaultlibs -fPIC -shared -fno-gnu-linker -Wl,-soname,libEXPO.so -o libEXPO.so ${APIOBJECTS} ${DETAILOBJECTS} ${OBJECTS} -L. -L../../../utl/CommonObjects/XML/ -L../../../utl/CommonObjects/Exceptions ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_thread-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_filesystem-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_system-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_regex-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_date_time-gcc41-mt-1_38.a ./libxerces-c.so.26 -lXML -lExceptions -lc /lib/libpthread.so. -- View this message in context: http://www.nabble.com/Statically-linking-libstdc%2B%2B.so.6-and-boost-tp2344... Sent from the Boost - Users mailing list archive at Nabble.com.