CMake OS X CLion. How to link a custom dynamic library? - c++

Question

Probably this question was asked several times. But I can't find a solution. I try to link a shared library and add it to RPATH. I tried several solutions:
Here is my Cmake file:
cmake_minimum_required(VERSION 3.7)
project(Cpp)
set(CMAKE_CXX_STANDARD 11)
file(GLOB CPP_UTILS CppUtils/*.cpp CppUtils/*.h)
set(SOURCE_FILES main.cpp ${CPP_UTILS})
add_executable(Cpp ${SOURCE_FILES})
SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
target_link_libraries(Cpp /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/libs/libpython3.7m.dylib)
include_directories(Include)
And it outputs the following error in runtime:
dyld: Library not loaded: /usr/local/lib/libpython3.7m.dylib
Referenced from: /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/Cpp
Reason: image not found
Temporary I just want link a custom library, to understand how it works. Then I want to copy the libs folder while build execution.
This is what it outputs when I try to run the command manually make VERBOSE=1
/Applications/CLion.app/Contents/bin/cmake/bin/cmake -H/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp -B/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug --check-build-system CMakeFiles/Makefile.cmake 0
/Applications/CLion.app/Contents/bin/cmake/bin/cmake -E cmake_progress_start /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles/progress.marks
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/Makefile2 all
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/Cpp.dir/build.make CMakeFiles/Cpp.dir/depend
cd /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug && /Applications/CLion.app/Contents/bin/cmake/bin/cmake -E cmake_depends "Unix Makefiles" /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles/Cpp.dir/DependInfo.cmake --color=
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/Cpp.dir/build.make CMakeFiles/Cpp.dir/build
make[2]: Nothing to be done for `CMakeFiles/Cpp.dir/build'.
[100%] Built target Cpp
/Applications/CLion.app/Contents/bin/cmake/bin/cmake -E cmake_progress_start /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles 0
yo:cmake-build-debug stikhonenko$ make clean
yo:cmake-build-debug stikhonenko$ make VERBOSE=1
/Applications/CLion.app/Contents/bin/cmake/bin/cmake -H/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp -B/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug --check-build-system CMakeFiles/Makefile.cmake 0
/Applications/CLion.app/Contents/bin/cmake/bin/cmake -E cmake_progress_start /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles/progress.marks
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/Makefile2 all
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/Cpp.dir/build.make CMakeFiles/Cpp.dir/depend
cd /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug && /Applications/CLion.app/Contents/bin/cmake/bin/cmake -E cmake_depends "Unix Makefiles" /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles/Cpp.dir/DependInfo.cmake --color=
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/Cpp.dir/build.make CMakeFiles/Cpp.dir/build
[ 25%] Building CXX object CMakeFiles/Cpp.dir/main.cpp.o
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -I/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/Include -g -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -std=gnu++11 -o CMakeFiles/Cpp.dir/main.cpp.o -c /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/main.cpp
[ 50%] Building CXX object CMakeFiles/Cpp.dir/CppUtils/System.cpp.o
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -I/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/Include -g -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -std=gnu++11 -o CMakeFiles/Cpp.dir/CppUtils/System.cpp.o -c /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/CppUtils/System.cpp
[ 75%] Building CXX object CMakeFiles/Cpp.dir/CppUtils/TimeUtils.cpp.o
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -I/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/Include -g -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -std=gnu++11 -o CMakeFiles/Cpp.dir/CppUtils/TimeUtils.cpp.o -c /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/CppUtils/TimeUtils.cpp
[100%] Linking CXX executable Cpp
/Applications/CLion.app/Contents/bin/cmake/bin/cmake -E cmake_link_script CMakeFiles/Cpp.dir/link.txt --verbose=1
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -g -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/Cpp.dir/main.cpp.o CMakeFiles/Cpp.dir/CppUtils/System.cpp.o CMakeFiles/Cpp.dir/CppUtils/TimeUtils.cpp.o -o Cpp ../libs/libpython3.7m.dylib
[100%] Built target Cpp
/Applications/CLion.app/Contents/bin/cmake/bin/cmake -E cmake_progress_start /Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/cmake-build-debug/CMakeFiles 0

Answer 1

You first need to tell cmake where to find the library (find_library), and only then you can use the result from find_library in target_link_libraries
find_library takes a PATHS argument which you can use to tell cmake where to look
find_library(
PYTHON_3
libpython3.7m
PATHS
/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/libs)
Now you will have a variable ${PYTHON_3} which contains the path to the library. You use that variable in target_link_libraries
target_link_libraries(
Cpp
${PYTHON_3})
Here is the complete CMakeLists.txt:
cmake_minimum_required(VERSION 3.7)
project(Cpp)
set(CMAKE_CXX_STANDARD 11)
file(GLOB CPP_UTILS CppUtils/*.cpp CppUtils/*.h)
set(SOURCE_FILES main.cpp ${CPP_UTILS})
add_executable(Cpp ${SOURCE_FILES})
SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
find_library(
PYTHON_3
libpython3.7m
PATHS
/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/libs)
target_link_libraries(Cpp ${PYTHON_3})
target_include_directories(Cpp Include)

Answer 2

Lets try linking the library's directory!
Assuming the name of your library is libpython3
cmake_minimum_required(VERSION 3.7)
project(Cpp)
set(CMAKE_CXX_STANDARD 11)
file(GLOB CPP_UTILS CppUtils/*.cpp CppUtils/*.h)
set(SOURCE_FILES main.cpp ${CPP_UTILS})
add_executable(Cpp ${SOURCE_FILES})
SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
LINK_DIRECTORIES(/Users/mac/Projects/ECMCalmnessScroreAlgo/Cpp/libs)
target_link_libraries(Cpp libpython3.7m)
include_directories(Include)
Does this work? :-)