This question already has answers here:
CMake link to external library
(6 answers)
Closed 3 years ago.
I am trying to link a shared object on my executable with an executable in my cmake project.
my CMakeLists.txt
cmake_minimum_required (VERSION 2.8)
project (proto_app)
add_executable( helloDemo hello.cpp )
add_executable( faissDemo 1-Flat.cpp )
My executable faissDemo doesn't compile like this because the shared object is not linked. The shared object is located in /usr/local/lib/libfaiss.so. My question is how should I link to the shared object in CMake?
I can compile 1-Flat.cpp successfully from the command line like:
$ g++ 1-Flat.cpp -L /usr/local/lib/ -lfaiss
You need to add the dir to the link_directories and add the lib as target_link_libraries:
cmake_minimum_required (VERSION 2.8)
project (proto_app)
link_directories(/usr/local/lib)
add_executable( helloDemo hello.cpp )
add_executable( faissDemo 1-Flat.cpp )
target_link_libraries(faissDemo faiss)
Related
This question already has answers here:
Using SDL2 with CMake
(12 answers)
Cmake cannot find library using "link_directories"
(4 answers)
Closed 10 months ago.
I'm using Visual Studio 2019 to make a small c++ game engine. I'm trying to link SDL2 with my project, and I got it to load the header files, but when I try to build it, I get an error. I'm using CMake btw.
LNK1104 cannot open file 'SDL2main.lib'
My project structure is as follows.
MyGame
-engine
-game
-sdl2
-include
-lib
Here is game/CMakeLists.txt
cmake_minimum_required (VERSION 3.8)
add_executable (game
main.cpp
)
include_directories(${CMAKE_SOURCE_DIR}/engine)
target_link_libraries(game engine)
Here is my engine/CMakeLists.txt:
cmake_minimum_required (VERSION 3.8)
add_library(engine engine.h app.cpp app.h)
set(SDL2_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/sdl2/include)
set(SDL2_LIB_DIR ${CMAKE_SOURCE_DIR}/sdl2/lib/x86)
include_directories(${SDL2_INCLUDE_DIR})
link_directories(${SDL2_LIB_DIR})
target_link_libraries(engine SDL2main SDL2)
Edit: I found a solution: I moved link_directories to the project’s global CMakeList and added a command to copy the SDL2.dll to the output directory.
This question already has answers here:
How to add "-l" (ell) compiler flag in CMake
(2 answers)
Closed 2 years ago.
In trying to link restbed with CMake I get the usual undefined function error. However, trying the exact same code linked with g++ test.cpp -o test -lrestbed works fine.
Furthermore, when I first implemented the CMakeLists.txt it also worked fine and as I added to the project it started facing issues. Now even a single restbed function is not defined.
My restbed includes are located at /usr/local/include and the shared objects to link at /usr/local/lib. Pretty standard locations.
CMakeLists.txt
cmake_minimum_required(VERSION 3.0)
project(vcar-server)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread -lrestbed")
file(GLOB CXX_EXEC "src/*.cpp")
add_subdirectory(vcar-embedded)
add_executable(vcar-server ${CXX_EXEC})
target_link_libraries(vcar-server vcar)
Do not use CMAKE_CXX_FLAGS, or rather use it as a "last resort" when configuring the build system as a user. Prefer to use object model in place of global variables. The modern cmake way would most probably be something along:
cmake_minimum_required(VERSION 3.11)
project(vcar-server)
add_subdirectory(vcar-embedded)
find_package(Threads REQUIRED)
add_executable(vcar-server ${cxx_exec})
target_link_libraries(vcar-server PUBLIC vcar restbed Threads::Threads)
set_target_properties(vcar-server PUBLIC CXX_STANDARD 20)
This question already has answers here:
CMake link to external library
(6 answers)
Closed 3 years ago.
Is job in qmake:
LIBS+= -L"C:\Program Files\program\any_dll.dll"
How to in cmake?
cmake_minimum_required(VERSION 2.8)
project(my_project)
add_executable(${PROJECT_NAME} "main.cpp")
If CMake does not now a target (i.e. it is not build by CMake) it assumes it to be a prebuild library.
link_directories(
"C:/Program Files/program"
)
add_executable(${PROJECT_NAME} "main.cpp")
target_link_libraries(${PROJECT_NAME}
any_dll
)
This question already has an answer here:
Build project with "experimental/filesystem" using cmake
(1 answer)
Closed 3 years ago.
I am trying to build a simple CMake project but I'm having problems understanding CMake or at least the error I get.
The project i made is divided in a couple directories.
The main one has this cmake:
cmake_minimum_required(VERSION 3.7.2)
project(Raytracer)
set(CMAKE_CXX_STANDARD 14)
add_subdirectory(src)
set(COMMON_INCLUDES ${PROJECT_SOURCE_DIR}/inc)
From there my project splits in 2 folders src and inc.
and in src i have the following cmake with the idea to global all subfolders:
FILE(GLOB sub-dirs RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *)
FOREACH(dir ${sub-dirs})
IF(IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${dir})
ADD_SUBDIRECTORY(${dir})
ENDIF()
ENDFOREACH()
add_executable(raytracer main.cpp)
I also add the executable there which is in this main src folder.
From there on i want to be able to make sub folders adding with their own Cmake files and linking those files to my executable.
I have the following cmake:
set(OBJECTS
asdf.cpp
)
add_library(obj_files ${OBJECTS} ${COMMON_FILES})
target_link_libraries(raytracer obj_files)
but when I try to build I get the following error:
Cannot specify link libraries for target "raytracer" which is not built by this project.
Basically in Cmake file or toolchain.cmake the order of commands are important!
target_link_libraries() or target_include_directories() have to be always after add_executable()
This question already has answers here:
CMake link to external library
(6 answers)
Closed 12 months ago.
I have 2 files: library.dll and library.h with some code that I need in my own project. I'm working on Windows with Clion where I should config this with CMake.
I tried this way:
cmake_minimum_required(VERSION 3.6)
project(test2)
set(CMAKE_CXX_STANDARD 11)
link_directories(C:\\Users\\Johny\\CLionProjects\\test2)
set(SOURCE_FILES main.cpp)
add_executable(test2 ${SOURCE_FILES})
target_link_libraries(test2 library.dll)
It compiled but didnt work. Returns code -1073741515
How can I handle with it?
Although this question is old. You are targeting the link library wrongly.
target_link_libraries(test2 library.dll) is wrong. This is an example linking SDL2. In the main CMakeList.txt
cmake_minimum_required(VERSION 3.12)
project(GraphicTest)
set(CMAKE_CXX_STANDARD 11)
include_directories("${PROJECT_SOURCE_DIR}/SDL")
add_subdirectory(SDL)
add_executable(GraphicTest main.cpp)
target_link_libraries(GraphicTest SDL2)
and in the library folder. Here SDL, add a CMakeLists.txt
message("-- Linking SDL")
add_library(SDL2 SDL2.dll)
set_target_properties(SDL2 PROPERTIES LINKER_LANGUAGE C)