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如果之前詢問過，請指向正確的方向。我有lib1和mod2，它們必須鏈接在一起。這個項目分散到幾個文件夾和幾個CMakeLists.txt文件。我使用的cmake命令是這樣：CMAKE將動態庫鏈接到模塊，但不顯示爲鏈接依賴關係
cmake的文件1（基DIR）：
# Set C/C++ compile and linking flags
set(GCC_COVERAGE_COMPILE_FLAGS "-fpic -Wno-as-needed")
set(GXX_COVERAGE_COMPILE_FLAGS "-std=c++11")
set(GXX_COVERAGE_LINK_FLAGS "-Wl,--no-undefined -Wno-as-needed")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS} ${GXX_COVERAGE_COMPILE_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER__FLAGS} ${GCC_COVERAGE_LINK_FLAGS}")
cmake的文件2（LIB1 DIR）：
pybind11_add_module(elka_comm__common
SHARED
pyelka_common.cpp
elka.cpp
elka_comm.cpp
)
set_target_properties(elka_comm__common PROPERTIES
LIBRARY_OUTPUT_DIRECTORY ${ELKA_BINARY_DIR}/python
)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS} ${GXX_COVERAGE_COMPILE_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER__FLAGS} ${GCC_COVERAGE_LINK_FLAGS}")
add_dependencies(elka_comm__common msg_gen)
cmake的文件3（MOD2 DIR）：
#FIXME ldd not showing elka_comm__common as a link dependency
# -> CommPort undefined symbol upon module import
target_link_libraries(
elka_comm__gnd_station
PUBLIC
elka_comm__common
)
set_target_properties(elka_comm__gnd_station PROPERTIES
LIBRARY_OUTPUT_DIRECTORY ${ELKA_BINARY_DIR}/python
)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS} ${GXX_COVERAGE_COMPILE_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER__FLAGS} ${GCC_COVERAGE_LINK_FLAGS}")
add_dependencies(elka_comm__gnd_station
elka_comm__common
msg_gen
)
我的幾個步驟是多餘的，因爲完整性檢查（例如，設置標誌W/CMake的變量）。
以下是ldd -r <path-to-mod2.so>/mod2.so的部分輸出：
linux-vdso.so.1 => (0x00007fff777fe000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fadfe690000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fadfe479000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fadfe0b0000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fadfddaa000)
/lib64/ld-linux-x86-64.so.2 (0x000055f1e6b2c000)
undefined symbol: _ZTIN4elka8CommPortE (build_elka_data_collection/python/elka_comm__gnd_station.so)
LIB1被稱爲elka_comm__common.so，因此它應該顯示爲一個庫依賴於ldd，對不對？
cmake/make命令的部分結果：
[100%] Linking CXX shared module ../../../python/elka_comm__gnd_station.so
cd /home/Programs/elka/elka_data_collection/build_elka_data_collection/src/elka_comm/gnd_station && /opt/cmake-3.4.3-Linux-x86_64/bin/cmake -E cmake_link_script CMakeFiles/elka_comm__gnd_station.dir/link.txt --verbose=1
/usr/bin/c++ -fPIC -fpic -Wno-as-needed -std=c++11 -fpic -Wno-as-needed -std=c++11 -g -shared -o ../../../python/elka_comm__gnd_station.so CMakeFiles/elka_comm__gnd_station.dir/pyelka_gnd_station.cpp.o CMakeFiles/elka_comm__gnd_station.dir/elka_devices.cpp.o `CMakeFiles/elka_comm__gnd_station.dir/inet_comm.cpp.o -L/home/Programs/elka/elka_data_collection/build_elka_data_collection/src/elka_comm/common -L/home/Programs/elka/elka_data_collection/build_elka_data_collection/src/elka_comm/gnd_station -L/home/Programs/elka/elka_data_collection/build_elka_data_collection/python -L/home/Programs/elka/elka_data_collection/python ../../../python/elka_comm__common.so -Wl,-rpath,/home/Programs/elka/elka_data_collection/build_elka_data_collection/src/elka_comm/common:/home/Programs/elka/elka_data_collection/build_elka_data_collection/src/elka_comm/gnd_station:/home/Programs/elka/elka_data_collection/build_elka_data_collection/python:/home/Programs/elka/elka_data_collection/python`
由此看來，似乎對我來說，鏈接正確完成。我最好的直覺是cmake生成的鏈接命令的排序是不正確的，但我不能證明這一點，除了知道鏈接命令對於排序是特定的。