将构建的 libevent 作为 static 库链接时出现 Linker 错误，但在作为共享库链接时有效

Question

I've built the libevent library from source as static library using GCC compiler(on linux). Cmake options:

cmake -B build -S . -DEVENT__DISABLE_OPENSSL=ON -DEVENT__LIBRARY_TYPE=STATIC -DEVENT__DISABLE_DEBUG_MODE=ON  
cmake --build build --config Release

Linking library in CMakeLists.txt:

target_link_libraries(${PROJECT_NAME}

        ${CMAKE_SOURCE_DIR}/libevent_core.a

        )

But I am still getting errors like this:

/usr/bin/ld: /home/user/libevent_test/main.cpp:65: undefined reference to `event_base_new'
/usr/bin/ld: /home/user/libevent_test/main.cpp:85: undefined reference to `event_new'
/usr/bin/ld: /home/user/libevent_test/main.cpp:89: undefined reference to `event_add'

Also I tried to build libevent as shared library (.so output file) and it linked well. In CMakeLists.txt I just changed ${CMAKE_SOURCE_DIR}/libevent_core.a to ${CMAKE_SOURCE_DIR}/libevent_core.so .
And my program compiled ok. Why static library doesn't links? What I'm doing wrong?
Thanks in advance!

Answer 1

Solved. I used target_link_libraries for executable, but libevent was used in static library which is linking to executable. Now I link libevent directly to static library which is using it. And it works.