[CMake] Compile shared library and call it's functions

[Andreas Pakulat]

Hi,

On Mon, Mar 7, 2016 at 9:29 PM, Ivan <ivan at sleepyiora.pw> wrote:

> Hello!
>
> Here is my CMakeLists.txt:
>
> cmake_minimum_required(VERSION 3.3)
> project(untitled19)
>
> set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
>
> set(LIBRARY_SRC library.cpp)
>
> add_library(libra SHARED ${LIBRARY_SRC})
>
> set(SOURCE_FILES main.cpp)
> add_executable(untitled19 ${SOURCE_FILES})
> target_link_libraries(untitled19 libra)
>
>
> This works and both library and executable are compiled. Unfortunately library seems to be linked into the executable: ‘nm’ command shows that the executable itself exports needed functions!
>
>
I do not think your interpreting the nm output correctly, but its hard to
say without seeing it ;)

Note that nm will show the functions exported by the library in the output
for the executable, because the executable uses those functions. It will
also indicate however that these functions are not defined inside the
executable in the corresponding column with an upper-case U. When you run
nm on the library itself you will notice that the same symbols have a
different type in the corresponding column. In addition you can verify that
the executable actually links against the library using the otool
commandline tool: otool -L executable.

Andreas
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