I am new to cmake and know this question has been asked before, but still cannot find what I am doing wrong. I have an external library with folders /include and lib. The /include folder contains all the headers (.h) and the /lib folder contains all the source (.c) files.
In my project I have this CMakeList.txt file:
cmake_minimum_required(VERSION 3.7)
project(FirstAttempt)
set(CMAKE_CXX_STANDARD 11)
set (EXTRA_LIBS "D:\\libtrading")
include_directories(${EXTRA_LIBS}/include)
link_directories(${EXTRA_LIBS}/include)
set(SOURCE_FILES main.cpp)
add_executable(FirstAttempt ${SOURCE_FILES})
target_link_libraries (FirstAttempt ${EXTRA_LIBS}/lib)
I know that I have to use target_link_libraries to link the source files of the library to my project, but certainly something is missing, but what? I am still receiving the error undefined reference to xxxxxx.
The library I am trying to include in my project is https://github.com/libtrading/libtrading.
Well, I'll try.
First, seems that you are calling link_directories() on the folder which contains header files, while it should be used in order to specify the path where to search libraries for.
Second, target_link_libraries() takes the absolute path of the shared/static library file as the second argument, while you are passing the directory path (well, it seems so).
target_link_libraries() doesn't link to the "source files of the library", - it links to the compiled shared/static library blob.
And, I would also recommend you to save the name of the executable to the variable so that you wouldn't be able to mistype the target name, like so:
set(TARGET FirstAttempt)
add_executable(${TARGET})
As you know, we need all source files to compile. So we need to point out Cmake know where/what are source files.
I think you should add all sources files like this
file(GLOB SOURCES_FILES "lib/*.c" main.cpp)
to add all .c files.
Or, you can add all lib/*.c files separately
file(SOURCES_FILES_LIBS "lib/*.c")
set(SOURCES_FILES main.cpp)
add_executable(FirstAttempt ${SOURCES_FILES_LIBS} ${SOURCES_FILES})
Related
I have a header-only library project set up with the cmake command:
add_library(my_library INTERFACE)
and I also added
target_sources(my_library INTERFACE ${MY_LIRBARY_HEADER_FILES})
but when I open a source file, I get the warning:
This file does not belong to any project target, code insight features might not work properly
and I lose a lot of the functionality on things like code completion.
What is the proper way to set this up so CLion provides its usual functionality on a header-only library?
Little background
I was having the same problem, albeit the project was not header-only, nevertheless, the open files from inc folder were throwing the aforementioned warning, even though the CMake file clearly marked that folder to be include_directory.
*.hpp files do not belong to ${SOURCE}
include_directories("${PROJECT_SOURCE_DIR}/inc/")
add_subdirectory(src)
add_executable(${EXECUTABLE_NAME} main.cpp ${SOURCE})
Since this is a perfectly valid CMake file and adding the include files to source files is not idiomatic, I did not want to amend the CMake file.
The solution
As described on the official JetBrains Forum, the CMake file is indeed valid and the warning is shown because of the inability of CLion to properly index header files. The suggested workaround extracted from the link is to right-click the folder and Mark directory as | Library Files/Project Sources and Headers.
So, this header isn't includes in executables and CLion notifies you that some code insight features might not work properly. As workaround you can use "Mark directory as" Library Files/Project Source and Headers for folder.
Clion takes information about source files from CMake build system. When you add any cpp file to sources list CMake automatically tell about header with same name. So if cpp/h names differs (or you don't have cpp file at all) you should include header manually.
set(Sources my_lib.cpp)
set(Headers header_of_my_lib.h)
add_executable(superlib ${Sources} ${Headers})
If you don't have any executable you can omit last line, CLion will still know about files
This warning is an IDE issue that Android Studio cannot recognise the current directory if it does not include any source files.
Workaround
Adding am empty source file, e.g empty_xxx.c under the directory in question and adding below line in your corresponding CMakeList.txt
add_library(${TARGET_NAME_XXX} SHARED ${SOME_DIR_HAVING_THIS_WARNING}/empty_xxx.c)
will help get rid of this warning.
You can add the header files to your project like this:
set(SOURCE_FILES main.cpp MyClass1.cpp MyClass1.h MyClass2.cpp MyClass2.h)
You can also set it in multiple steps like so:
set(SOURCE_FILES main.cpp)
set(SOURCE_FILES ${SOURCE_FILES} MyClass1.cpp MyClass1.h)
set(SOURCE_FILES ${SOURCE_FILES} MyClass2.cpp MyClass2.h)
Though as mentioned in the comments, you probably shouldn't be adding the header files to your project at all.
I am new to cmake and know this question has been asked before, but still cannot find what I am doing wrong. I have an external library with folders /include and lib. The /include folder contains all the headers (.h) and the /lib folder contains all the source (.c) files.
In my project I have this CMakeList.txt file:
cmake_minimum_required(VERSION 3.7)
project(FirstAttempt)
set(CMAKE_CXX_STANDARD 11)
set (EXTRA_LIBS "D:\\libtrading")
include_directories(${EXTRA_LIBS}/include)
link_directories(${EXTRA_LIBS}/include)
set(SOURCE_FILES main.cpp)
add_executable(FirstAttempt ${SOURCE_FILES})
target_link_libraries (FirstAttempt ${EXTRA_LIBS}/lib)
I know that I have to use target_link_libraries to link the source files of the library to my project, but certainly something is missing, but what? I am still receiving the error undefined reference to xxxxxx.
The library I am trying to include in my project is https://github.com/libtrading/libtrading.
Well, I'll try.
First, seems that you are calling link_directories() on the folder which contains header files, while it should be used in order to specify the path where to search libraries for.
Second, target_link_libraries() takes the absolute path of the shared/static library file as the second argument, while you are passing the directory path (well, it seems so).
target_link_libraries() doesn't link to the "source files of the library", - it links to the compiled shared/static library blob.
And, I would also recommend you to save the name of the executable to the variable so that you wouldn't be able to mistype the target name, like so:
set(TARGET FirstAttempt)
add_executable(${TARGET})
As you know, we need all source files to compile. So we need to point out Cmake know where/what are source files.
I think you should add all sources files like this
file(GLOB SOURCES_FILES "lib/*.c" main.cpp)
to add all .c files.
Or, you can add all lib/*.c files separately
file(SOURCES_FILES_LIBS "lib/*.c")
set(SOURCES_FILES main.cpp)
add_executable(FirstAttempt ${SOURCES_FILES_LIBS} ${SOURCES_FILES})
I'm a robotics' student from Instituto Superior Técnico and I'm having trouble using an external library in my project.
I use a Robotics simulator called Simox http://simox.sourceforge.net/. This is a library that I have been working for a while. I have been using a cmake template file provided with the simulator (with few alterations) which lets me use Simox with my own code:
PROJECT ( myDemo )
FIND_PACKAGE(Simox REQUIRED)
IF(Simox_USE_COIN_VISUALIZATION)
include_directories(${PROJECT_SOURCE_DIR}/include)
FILE(GLOB SRCS ${PROJECT_SOURCE_DIR}/iCubSimulator.cpp ${PROJECT_SOURCE_DIR}/src/iCub.cpp ${PROJECT_SOURCE_DIR}/src/iCubHand.cpp ${PROJECT_SOURCE_DIR}/src/ApproachMovementSpace.cpp ${PROJECT_SOURCE_DIR}/src/OrientedBoundingBox.cpp ${PROJECT_SOURCE_DIR}/src/GraspOptimization.cpp ${PROJECT_SOURCE_DIR}/src/Window.cpp)
FILE(GLOB INCS ${PROJECT_SOURCE_DIR}/include/iCub.h ${PROJECT_SOURCE_DIR}/include/iCubHand.h ${PROJECT_SOURCE_DIR}/include/ApproachMovementSpace.h ${PROJECT_SOURCE_DIR}/include/OrientedBoundingBox.h ${PROJECT_SOURCE_DIR}/include/Window.h)
set(GUI_MOC_HDRS ${PROJECT_SOURCE_DIR}/include/GraspOptimization.h ${PROJECT_SOURCE_DIR}/include/Window.h)
set(GUI_UIS ${PROJECT_SOURCE_DIR}/ui/iCubSimulator.ui)
set(CMAKE_CXX_FLAGS "-Wall -std=c++11 -lpthread")
SimoxQtApplication(${PROJECT_NAME} "${SRCS}" "${INCS}" "${GUI_MOC_HDRS}" "${GUI_UIS}")
ENDIF()
Currently, I want to use an additional Bayesian Optimization Library called BayesOpt: http://rmcantin.bitbucket.org/html/. And I don't know how to correctly modify my cmake file to include this library.
I tried to do this own my own, with some help from google, tutorials and other asked questions, but with no success.
I'm hoping someone can help me with this problem.
Thanks in advance!
To use an external library, you will need to:
Make header files from the library accessible:
INCLUDE_DIRECTORIES( includePath )
includePath being your Bayesian Optimization Library include folder (where .h files are)
Link with the library. To do so, just add:
TARGET_LINK_LIBRARIES(${PROJECT_NAME} mylib)
myLib being your Bayesian Optimization Library .lib file or .so file
Maybe you'll first have to compile the "Bayesian Optimization Library"
If the library is correctly installed in your environment, there could be an easier way to have it be found using CMake find_package command, but I'm not familiar with it, I prefer to handle things manually as proposed aboce.
Regards:
I have two different C++ projects, each one with its own CMakeList.txt file that generates a .so library file. E.g. both projects are under the paths trunk/A, and trunk/B, and they contain the files:
trunk/A/CMakeList.txt
trunk/B/CMakeLists.txt
that respectively generate files A.so and B.so. For practical reasons, I want to keep both projects A and B separated, but I would also like to have a CMakeList.txt file (e.g. trunk/CMakeList.txt) that would compile both binaries simultaneously.
I expected to replicate something similar to what can be achieved with qmake, by including a .pri file in a .pro file. Hence, I tried by including both CMakeList files with the following code for trunk/CMakeList.txt:
PROJECT(TEST)
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
include(A/CMakeLists.txt)
include(B/CMakeLists.txt)
But CMake does not work that way. The contents in the included CMakeList files are evaluated from the trunk directory. E.g, by reading the following line in trunk/A/CMakeList.txt:
FILE(GLOB HEADERS *.h)
CMake will only look for *.h files in /trunk, not in /trunk/A
Is there a proper way to do this in CMake? Something similar to what QMake does with .pri include files?
Hundred thanks in advance!.
You need to use ADD_SUBDIRECTORY:
PROJECT(TEST)
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
ADD_SUBDIRECTORY( A )
ADD_SUBDIRECTORY( B )
I have created a project which consists of a main.cpp file and another class (named Physical) that is broken up into a Physical.hpp file and Physical.cpp file.
The project file structure looks like this:
main.cpp
header/Physical.hpp
src/Physical.cpp
The project compiles fine, but only if I include Physical.hpp in different ways depending on whether or not I'm including from the Physical.cpp or main.cpp file.
From the main file, I have to use:
#include "header/Physical.hpp"
Whereas, from the Physical.cpp file I have to use:
#include "../header/Physical.hpp"
Why is there this discrepancy? I expect it has something to do with my cmake configuration file, although I'm really not sure. Below is my cmake config file.
cmake_minimum_required(VERSION 2.8.4)
project(gravity_simulator ${PROJECT_BINARY_DIR})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(SOURCE_FILES main.cpp src/Physical.cpp)
include_directories("${PROJECT_BINARY_DIR}")
add_executable(gravity_simulator ${SOURCE_FILES})
# Detect and add SFML
set(CMAKE_MODULE_PATH "/usr/share/SFML/cmake/Modules/" ${CMAKE_MODULE_PATH})
#Find any version 2.X of SFML
#See the FindSFML.cmake file for additional details and instructions
find_package(SFML 2 REQUIRED system window graphics network audio)
if(SFML_FOUND)
include_directories(${SFML_INCLUDE_DIR})
target_link_libraries(gravity_simulator ${SFML_LIBRARIES})
endif()
Everything works as expected.
For your main.cpp file the header is located at header/Physical.hpp while for your Physical.cpp the header is located at ../header/Physical.hpp.
The mistake here is, that you think the relative path would always start from a specific directly, while instead every source file (*.cpp) gets compiled independently and thus the header search is happening for each file independently.
Personally if I don't write a library, I simply put all my source and header files in a src directory and everything will be fine. However if I'm writing a library, I use the <header.hpp> style and add the header directory to the include directory (include_directories("header")). The whole reason why one usually splits up things into header and source files is, so when one ships a library one can easily just ship the headers and doesn't have manually filter them out between the source files.
tl;dr When writing an application put everything a source directory. When writing a library, use the <> for the inclusion add the header directory to the include directories.