我正在使用c ++ mysql连接器，当我在ubnutu 14.04 64bit（g ++ 4.8.4）上编译时，会出现以下错误：
....所以：未定义引用`get_driver_instance＆＃39;
但是如果我尝试在Debian 8 64bit（g ++ 4.8.4）上编译它，它编译没有任何错误...
如果我在ubuntu上编译它，但是使用g ++ 5.1它没有错误......
我跑的命令：
g ++ - 4.9 -std = c ++ 11 -lmysqlcppconn server.cpp -I ./websocketpp/ -L mysql-connector-c ++ / lib -lboost_system -lbeanstalkpp -lboost_chrono -I rapidjson / include /
修改 带错误的编译器输出（使用-v开关）
g++ -v -std=c++11 server.cpp -I mysql-connector-c++/include/cppconn/ -I ./websocketpp/ -L mysql-connector-c++/lib -lboost_system -lmysqlcppconn -lbeanstalkpp -lboost_chrono -I rapidjson/include/ -lpthread
[1] 4364
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.4-2ubuntu1~14.04' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)
COLLECT_GCC_OPTIONS='-v' '-std=c++11' '-I' 'mysql-connector-c++/include/cppconn/' '-I' './websocketpp/' '-Lmysql-connector-c++/lib' '-I' 'rapidjson/include/' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/4.8/cc1plus -quiet -v -I mysql-connector-c++/include/cppconn/ -I ./websocketpp/ -I rapidjson/include/ -imultiarch x86_64-linux-gnu -D_GNU_SOURCE server.cpp -quiet -dumpbase server.cpp -mtune=generic -march=x86-64 -auxbase server -std=c++11 -version -fstack-protector -Wformat -Wformat-security -o /tmp/cc8ZjcCL.s
GNU C++ (Ubuntu 4.8.4-2ubuntu1~14.04) version 4.8.4 (x86_64-linux-gnu)
compiled by GNU C version 4.8.4, GMP version 5.1.3, MPFR version 3.1.2-p3, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/4.8"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
mysql-connector-c++/include/cppconn/
./websocketpp/
rapidjson/include/
/usr/include/c++/4.8
/usr/include/x86_64-linux-gnu/c++/4.8
/usr/include/c++/4.8/backward
/usr/lib/gcc/x86_64-linux-gnu/4.8/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C++ (Ubuntu 4.8.4-2ubuntu1~14.04) version 4.8.4 (x86_64-linux-gnu)
compiled by GNU C version 4.8.4, GMP version 5.1.3, MPFR version 3.1.2-p3, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 9cb21c615435621dce26fe5e793192fd
COLLECT_GCC_OPTIONS='-v' '-std=c++11' '-I' 'mysql-connector-c++/include/cppconn/' '-I' './websocketpp/' '-Lmysql-connector-c++/lib' '-I' 'rapidjson/include/' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
as -v -I mysql-connector-c++/include/cppconn/ -I ./websocketpp/ -I rapidjson/include/ --64 -o /tmp/cczJ3S6r.o /tmp/cc8ZjcCL.s
GNU assembler version 2.24 (x86_64-linux-gnu) using BFD version (GNU Binutils for Ubuntu) 2.24
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-std=c++11' '-I' 'mysql-connector-c++/include/cppconn/' '-I' './websocketpp/' '-Lmysql-connector-c++/lib' '-I' 'rapidjson/include/' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/4.8/collect2 --sysroot=/ --build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed -dynamic-linker /lib64/ld-linux-x86-64.so.2 -z relro /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.8/crtbegin.o -Lmysql-connector-c++/lib -L/usr/lib/gcc/x86_64-linux-gnu/4.8 -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../.. /tmp/cczJ3S6r.o -lboost_system -lmysqlcppconn -lbeanstalkpp -lboost_chrono -lpthread -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-linux-gnu/4.8/crtend.o /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crtn.o
//usr/local/lib/libbeanstalkpp.so: undefined reference to `get_driver_instance'
collect2: error: ld returned 1 exit status
[1]+ Exit 1 g++ -v -std=c++11 server.cpp -I mysql-connector-c++/include/cppconn/ -I ./websocketpp/ -L mysql-connector-c++/lib -lboost_system -lmysqlcppconn -lbeanstalkpp -lboost_chrono -I rapidjson/include/ -lpthread