Re: Creating and sharing a c++ shared library ?

[Markus Kossmann]

vivekian wrote:

> Hi ,
> 
> These are the steps i followed to create a shared library
> 
> 1. Compiled the cpp files
> 
> g++ -c -g -fpic  -Wall -Wno-deprecated SockException.cpp -o
> SockException.o
> g++ -c -g -fpic -Wall -Wno-deprecated Socket.cpp -o Socket.o
> g++ -c -g -fpic -Wall -Wno-deprecated TcpSocket.cpp -o TcpSocket.o
> g++ -c -g -fpic -Wall -Wno-deprecated UdpSocket.cpp -o UdpSocket.o
> g++ -c -g -fpic -Wall -Wno-deprecated SocketReaderWriter.cpp -o
> SocketReaderWriter.o
> g++ -shared -Wl,-soname,libcppsocket.so.1 -o libcppsocket.so.1.0.1
> SockException.o Socket.o TcpSocket.o UdpSocket.o SocketReaderWriter.o -
> lc
> 
> 2. Copied the compiled libcppsocket.so.1 to the directories /usr/lib
> 
> 3. Moved the header files to the directories /usr/include and /usr/
> local/include
> 
> 4. To test the compiled library , i wrote a small program
> 
> #include <TcpSocket.h>
> 
> int main ()
> {
>         TcpSocket sock ;
> }
> 
> where TcpSocket.h is one of the header files copied to /usr/include
> 
> 5. Compiling this test program
> 
> g++  main.cpp
> /tmp/ccPqeVa9.o: In function `main':
> main.cpp:(.text+0x8a): undefined reference to `TcpSocket::TcpSocket()'
> main.cpp:(.text+0x95): undefined reference to
> `TcpSocket::~TcpSocket()'
> collect2: ld returned 1 exit status
> 
> gives the above error.
> 
> This i suppose indicates that the library has to be linked. But the
> following doesnt help
> g++ main.cpp -llibcppsocket
> 
> What am i missing here ?
The linker looks only for .so and .a files ( without any version number)
Create a link libcppsocket.so -> libcppsocket.so.1.0.1.