Link error with my own C++ library -

this first time trying make simple library. worked in ubuntu 12.04 g++ 4.6.3. here problem:

[[mylib.cpp]] #include<sqlite3.h> void mylib::blahblah() {...} void mylib::evenmoreblah() {...} ...  [[mylib.h]] #include <...> class mylib {     ... }; 

then made lib by:

 gcc -c -wall -fpic mylib.cpp  gcc -shared -o libmylib.so mylib.o 

i used library in single test.cpp contains main(). put libmylib.so in ./libdir, , compiled using:

 g++ -g test.cpp -o test -lpthread -l/usr/local/lib -lsqlite3 -l./libdir -lmylib 

the error got:

./libdir/libmylib.so: undefined reference `sqlite3_close' ./libdir/libmylib.so: undefined reference `sqlite3_exec' ./libdir/libmylib.so: undefined reference `sqlite3_free' ./libdir/libmylib.so: undefined reference `sqlite3_open' 

you link -lsqlite3 shared library with

 gcc -shared mylib.o -o libmylib.so -lsqlite3 

^{if that, don't need explicitly link -lsqlite3 program, won't harm.}

and order of linking arguments program important:

 g++ -wall -g test.cpp -o mytest \    -l./libdir -lmylib -l/usr/local/lib -lsqlite3 -lpthread 

it should go higher-level libraries lower-level (i.e. system) ones. , don't forget -wall warnings compiler, useful.

read program library howto.

ps. don't call program test shell builtin (and standard /usr/bin/test). use other name.