CODEWITHSUNDEEP
c++cmakemqttpahocpp
darthShana
darthShana

Reputation: 387

Using https://github.com/eclipse/paho.mqtt.cpp with a cmake build

I'm a bit new to CMake. So this might be a noob question..

I'm trying to build cpp project with CMake. I would like my program to publish to a mqtt broker. I'm running on Linux.

So I installed https://github.com/eclipse/paho.mqtt.cpp and the corresponding c project by doing (side by side)

$ git clone https://github.com/eclipse/paho.mqtt.c.git
$ cd paho.mqtt.c
$ git checkout v1.3.1

$ cmake -Bbuild -H. -DPAHO_WITH_SSL=ON -DPAHO_ENABLE_TESTING=OFF
$ sudo cmake --build build/ --target install
$ sudo ldconfig

as per the documentation and then doing.

$ git clone https://github.com/eclipse/paho.mqtt.cpp
$ mkdir build
$ cd build
$ cmake ../
$ make
$ sudo make install

which all worked fine without any errors.. Now what do i put in my own cmakelists file in my own project that I can use the libraries? So I can do.

#include "mqtt/async_client.h"

int main(int argc, char *argv[]){
   std::cout << "Hello World!" << std::endl;
   mqtt::async_client cli(DFLT_ADDRESS, "", 120, PERSIST_DIR);


   return 0;
}

I tried a simple.

cmake_minimum_required(VERSION 2.8.9)
project (hello)

find_package(PahoMqttCpp REQUIRED)


add_executable(hello helloworld.cpp)
target_link_libraries(hello ${PAHO_CPP_LIB})

But that does not seem to be enough.. I get

helloworld.cpp:(.text+0xd3): undefined reference to `mqtt::async_client::~async_client()'

Any help would be appreciated.

Upvotes: 3

Views: 2114

Answers (1)

darthShana
darthShana

Reputation: 387

Okay, after some digging, I found the correct thing to write is:

target_link_libraries(hello paho-mqttpp3 paho-mqtt3as)

Upvotes: 5

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