Can't build paho.mqtt.c, how to solve it?

[jayjupdhig]

Hi there

1.) Why i can't find that page (https://github.com/eclipse/paho.mqtt.c) not on https://github.com/eclipse/ ? When i visit https://github.com/eclipse/ and use Ctrl-F to find "paho", only get the java version - which is, i.m.o, a lil bit confusing....(???)

2.) The compilation of paho.mqtt.c (https://github.com/eclipse/paho.mqtt.c.git) in version 1.3.8 works well.

2.1) Clone & checkout to a specific version:

eatmydata -- git clone https://github.com/eclipse/paho.mqtt.c.git;
  mv paho.mqtt.c PAHO_MQTT_C;
  cd PAHO_MQTT_C;
  eatmydata -- git config credential.helper store;
  eatmydata -- git checkout v1.3.8 > /dev/null 2>&1 ||:;
  eatmydata -- git pull > /dev/null 2>&1 ||:;
  eatmydata -- git config credential.helper store;

2.2) Then compile:

cd ~/deployment/Temp/PAHO_MQTT_C;

eatmydata -- cmake -Bbuild -H. -DPAHO_ENABLE_TESTING=OFF -DPAHO_HIGH_PERFORMANCE=ON;
eatmydata -- cmake --build build/ --target install;
eatmydata -- ldconfig;

Output:

+ cd /root/deployment/Temp/PAHO_MQTT_C
+ eatmydata -- cmake -Bbuild -H. -DPAHO_ENABLE_TESTING=OFF -DPAHO_HIGH_PERFORMANCE=ON
-- CMake version: 3.13.4
-- CMake system name: Linux
-- Timestamp is 2021-01-28T11:15:47Z
-- Configuring done
-- Generating done
-- Build files have been written to: /root/deployment/Temp/PAHO_MQTT_C/build
+ eatmydata -- cmake --build build/ --target install
[ 75%] Built target common_obj
Scanning dependencies of target paho-mqtt3c
[ 78%] Building C object src/CMakeFiles/paho-mqtt3c.dir/MQTTClient.c.o
[ 82%] Linking C shared library libpaho-mqtt3c.so
[ 82%] Built target paho-mqtt3c
Scanning dependencies of target paho-mqtt3a
[ 85%] Building C object src/CMakeFiles/paho-mqtt3a.dir/MQTTAsync.c.o
[ 89%] Linking C shared library libpaho-mqtt3a.so
[ 92%] Built target paho-mqtt3a
[ 96%] Linking C executable MQTTVersion
[100%] Built target MQTTVersion
Install the project...
-- Install configuration: ""
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/MQTTAsync_publish.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/MQTTAsync_publish_time.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/MQTTAsync_subscribe.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/MQTTClient_publish.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/MQTTClient_publish_async.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/MQTTClient_subscribe.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/paho_c_pub.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/paho_c_sub.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/paho_cs_pub.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/paho_cs_sub.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/samples/pubsub_opts.c
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/CONTRIBUTING.md
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/epl-v20
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/edl-v10
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/README.md
-- Up-to-date: /usr/local/share/doc/Eclipse Paho C/notice.html
-- Installing: /usr/local/lib/libpaho-mqtt3c.so.1.3.8
-- Up-to-date: /usr/local/lib/libpaho-mqtt3c.so.1
-- Up-to-date: /usr/local/lib/libpaho-mqtt3c.so
-- Installing: /usr/local/lib/libpaho-mqtt3a.so.1.3.8
-- Up-to-date: /usr/local/lib/libpaho-mqtt3a.so.1
-- Up-to-date: /usr/local/lib/libpaho-mqtt3a.so
-- Installing: /usr/local/bin/MQTTVersion
-- Set runtime path of "/usr/local/bin/MQTTVersion" to ""
-- Up-to-date: /usr/local/include/MQTTAsync.h
-- Up-to-date: /usr/local/include/MQTTClient.h
-- Up-to-date: /usr/local/include/MQTTClientPersistence.h
-- Up-to-date: /usr/local/include/MQTTProperties.h
-- Up-to-date: /usr/local/include/MQTTReasonCodes.h
-- Up-to-date: /usr/local/include/MQTTSubscribeOpts.h
-- Up-to-date: /usr/local/include/MQTTExportDeclarations.h
-- Up-to-date: /usr/local/lib/cmake/eclipse-paho-mqtt-c/eclipse-paho-mqtt-cConfig.cmake
-- Installing: /usr/local/lib/cmake/eclipse-paho-mqtt-c/eclipse-paho-mqtt-cConfig-noconfig.cmake
-- Up-to-date: /usr/local/lib/cmake/eclipse-paho-mqtt-c/eclipse-paho-mqtt-cConfigVersion.cmake
+ eatmydata -- ldconfig

3.) BUT... when i try to compile paho.mqtt.cPP (https://github.com/eclipse/paho.mqtt.cpp.git) i have some a problem at the compile step.

3.1) Clone & checkout to "standard" (master branch or release - whatever. As long as it works):

  rm -rf paho.mqtt.cpp && rm -rf PAHO_MQTT_CPP;
  eatmydata -- git clone https://github.com/eclipse/paho.mqtt.cpp.git;
  mv paho.mqtt.cpp PAHO_MQTT_CPP;
  cd PAHO_MQTT_CPP;
  eatmydata -- git config credential.helper store;
  eatmydata -- git pull;
  eatmydata -- git config credential.helper store;

3.2) Then compile:

cd ~/deployment/Temp/PAHO_MQTT_CPP;

export LIBRARY_PATH=$LIBRARY_PATH:/usr/local/lib;
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib;

eatmydata -- cmake -Bbuild -H. -DPAHO_BUILD_DOCUMENTATION=FALSE;
cmake --build build/ --target install;
ldconfig;

...ends with that error:

+ cd /root/deployment/Temp/PAHO_MQTT_CPP
+ export LIBRARY_PATH=:/usr/local/lib
+ LIBRARY_PATH=:/usr/local/lib
+ export LD_LIBRARY_PATH=:/usr/local/lib
+ LD_LIBRARY_PATH=:/usr/local/lib
+ eatmydata -- cmake -Bbuild -H. -DPAHO_BUILD_DOCUMENTATION=FALSE
CMake Error at /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find PahoMqttC (missing: PAHO_MQTT_C_LIBRARIES)
Call Stack (most recent call first):
  /usr/share/cmake-3.13/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindPahoMqttC.cmake:33 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  src/CMakeLists.txt:26 (find_package)


-- Configuring incomplete, errors occurred!
See also "/root/deployment/Temp/PAHO_MQTT_CPP/build/CMakeFiles/CMakeOutput.log".

When i look on conan-io/conan-center-index#3760, they write that i just have to do some steps with the paho.mqtt.cpp file;

But, in fact, a paho.mqtt.cpp doesn't exist:

root@xxx-debian10:~/deployment/Temp# find ./PAHO_MQTT_CPP | grep paho.mqtt.cpp
root@xxx-debian10:~/deployment/Temp#

Thank you very very much for your feedbacks! :-)

[jumoog]

well 1)

XMu5yDxQpM.mp4

[jayjupdhig]

Oh...

Thank you very much - i was thinking it's my mistake, the eclipse foundation has MUCH MORE projects than the few ones on the project front page! ;-)

[jayjupdhig]

-> conan-io/conan-center-index#3760

[icraggs]

So this is really about the C++ client build?

[icraggs]

That is, you can build the C client, but not the C++ client.

[kosuodhmwa]

OK thx. (This is my personal account)

So how to build the C++ client? Does somebody know this?

thank you very much for your feedbacks.

[jayjupdhig]

"That is, you can build the C client, but not the C++ client."

But why is there a C++ client if we can't compile - what's the sense of that? Does not make any sense i'm my opinion...? ;-)

[icraggs]

Er, yes the C++ client can build. I didn't say that it couldn't, just that you apparently are finding it difficult. The C++ client repository is https://github.com/eclipse/paho.mqtt.cpp which you already cloned from. There are build instructions there.

[icraggs]

I'm going to close this as it concerns the C++ client build (link above).