[CMake] Problems with cmake, visualstudio generator and add_library / target_link_libraries

[Bill Hoffman]

Thomas Veith wrote:
> Hi *,
> 
> when using a simple CMakeLists.txt like the following:
> 
> cmake_minimum_required(VERSION 2.6)
> PROJECT(socket)
> 
> add_definitions( -D_CRT_SECURE_NO_WARNINGS )
> 
> add_library(socket STATIC  ../../src/base64.cpp ../../src/http.cpp
> ../../src/PoolThread.cpp ../../src/ResourceHandler.cpp
> ../../src/socket.cpp ../../src/sslsocket.cpp )
> 
> target_link_libraries(socket  ws2_32.lib )
> <<<


CMake does not link anything to static libraries.  However, if you later 
do something like this:


add_executable(foo foo.cpp)
target_link_libraries(foo socket)

Then foo will link to socket and ws2_32.  You should not get undefined 
symbols from the creation of a static library.  Linking static libraries 
to static libraries is not portable (can't even do it on other 
platforms).  You might want to try some windows pragma magic in your 
code if you want to do something like this.

-Bill