CODEWITHSUNDEEP
cmakeclion
sani
sani

Reputation: 53

including itensor library in my cmake project in clion

so I am very new to CLion and CMake, so sorry in advance for wrong usage of terminology. I am suffering the following problem:

In my project I want to include the ITensor library which is essentially a non-CMake project. I cloned the git to my computer and build the ITensor project. Next I wanted to use it in another project linking against it with CMake:

My Code in main.cpp:

#include <iostream>
#include "itensor.h"

int main() {
    std::string some_string = "Hello world";
    return 0;
}

and my CMakeLists.txt looks like:

cmake_minimum_required(VERSION 3.6)
project(tutorial)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")


set(ITENSOR_DIR PATH/TO/ITENSOR)
include_directories(ITENSOR_DIR/itensor)

set(SOURCE_FILES
        main.cpp
        ${ITENSOR_DIR}/itensor/itensor.h
        ${ITENSOR_DIR}/itensor/itensor.cc)

add_executable(tutorial ${SOURCE_FILES})

Unfortunately, the project 'tutorial' does not build in CLion. Likewise, CLion cannot resolve the dependency itensor.h. Anybody an Idea for why this is, respectively how to fix it?

Upvotes: 0

Views: 258

Answers (2)

DavidAce
DavidAce

Reputation: 526

After trying Thomas5631's solution the compilation ran into linking issues with lapack. I solved this by adding some flags, though I'm not sure if all of them are required.

My CMakeLists.txt:

cmake_minimum_required(VERSION 3.6)
project(my_project)
#Bring the headers into the project (full or relative path)
include_directories(itensor) 

#Link the Itensor library
add_library(itensor STATIC IMPORTED)
set_property(TARGET itensor PROPERTY IMPORTED_LOCATION /home/david/my_project/itensor/lib/libitensor.a)

#Set a variable with all the new flags
set(ITENSOR_FLAGS "-DPLATFORM_lapack -D__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES=0")
set(ITENSOR_LINK_FLAGS "-DPLATFORM_lapack -L/home/david/my_project/itensor/lib -litensor -lpthread -L/usr/lib -lblas -llapack")

#Append the new flags
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 ${ITENSOR_FLAGS}")

add_executable(my_project main.cpp)
target_link_libraries(my_project itensor "${ITENSOR_LINK_FLAGS}")

Motivation: In the folder itensor/project_template there is a sample program which is simple enough to compile with make (from the terminal). The output of the compilation reveals the flags:

g++ -m64 -std=c++11 -c -I. -I/home/david/my_project/itensor -I/usr/include -O3 -DNDEBUG -Wall -DPLATFORM_lapack -D__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES=0 -Wno-unused-variable -o myappname.o myappname.cc

[... some warnings ...]

g++ -m64 -std=c++11 -c -I. -I/home/david/my_project/itensor -I/usr/include -O3 -DNDEBUG -Wall -DPLATFORM_lapack -D__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES=0 -Wno-unused-variable -o myclass.o myclass.cc
g++ -m64 -std=c++11 -I. -I/home/david/my_project/itensor -I/usr/include -O3 -DNDEBUG -Wall -DPLATFORM_lapack -D__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES=0 -Wno-unused-variable myappname.o myclass.o -o myappname -L/home/david/my_project/itensor/lib -litensor -lpthread -L/usr/lib -lblas -llapack

Upvotes: 1

Thomas5631
Thomas5631

Reputation: 244

I got around the issue with the following main.cpp:

#include <iostream>
#include "itensor/itensor.h"

int main() {
    std::string some_string = "Hello world";
    return 0;
}

And the following CMakeLists.txt:

project(tutorial)
cmake_minimum_required(VERSION 3.6)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

#Bring the headers into the project
include_directories(/home/tom/Documents/workspace/ITensor/)

#Link the library
add_library(itensor STATIC IMPORTED)
set_property(TARGET itensor PROPERTY IMPORTED_LOCATION /home/tom/Documents/workspace/ITensor/lib/libitensor.a)

set(SOURCE_FILES  main.cpp)
add_executable(tutorial ${SOURCE_FILES})

Where the path to ITensor can be either relative (using the ${PROJECT_SOURCE_DIR} variable) or absolute as I have shown.

Upvotes: 0

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