Compile MQTT library & need to update to latest 5.11

[bhu24]

@jsulm my requirement is to compile "MQTT" library which need qt 5.11.1 higher version and compiler 4.9 as per my knowledge please suggest me solution on same.
Thanks for help!!

[jsulm]

@bhu24 Did you check whether GCC 4.9 is really set in your Kit?

[bhu24]

@jsulm yes as you can see in screen shot

1. Got compiler output window as follows:
   home/balkrishna/Desktop/qt/qtmqtt/include/QtMqtt/QtMqttDepends -o .pch/Qt5Mqtt.gch/c++
   g++: error: unrecognized command line option '-std=c++1z'
   make[2]: Leaving directory /home/balkrishna/build-qtmqtt-Qt_5_11_1-Debug/src/mqtt' make[1]: Leaving directory /home/balkrishna/build-qtmqtt-Qt_5_11_1-Debug/src'
   make[2]: *** [.pch/Qt5Mqtt.gch/c++] Error 1
   make[1]: *** [sub-mqtt-make_first] Error 2
   make: *** [sub-src-make_first] Error 2
   12:29:01: The process "/usr/bin/make" exited with code 2.
   Error while building/deploying project qtmqtt (kit: Qt 5.11.1)
   When executing step 'Make'

2. In Genral message window shows following :

/home/balkrishna/Qt5.11.1/5.11.1/gcc_64/mkspecs/features/qmake_use.prf(6): 'take_first' is not a recognized replace function.
Project ERROR: Library '' is not defined.
/home/balkrishna/Qt5.11.1/5.11.1/gcc_64/mkspecs/features/qmake_use.prf(6): 'take_first' is not a recognized replace function.
Project ERROR: Library '' is not defined.

3. In Issue window show following:

error: error: unrecognized command line option '-std=c++1z'
error: [.pch/Qt5Mqtt.gch/c++] Error 1

Any thing is wrong from my side so please let me know and suggest which things should i cross check to resolve this issue

[jsulm]

@bhu24 said in Compile MQTT library & need to update to latest 5.11:

yes as you can see in screen shot

No, I can't as you did not post the screen-shot of your Kit...

[bhu24]

@jsulm 

i tried all one by one

1. /usr/bin/x86_64-linux-gnu-gcc-4.9
2. /usr/bin/x86_64-linux-gnu-g++-4.9
3. /usr/bin/x86_64-linux-gnu-cpp-4.9

[jsulm]

@bhu24 Can you show your pro file

[bhu24]

@jsulm 

I am using "qtmqtt" folder to compile mqtt library is right or wrong??? please let me know

[jsulm]

@bhu24 I'm wondering from where this -std=c++1z is coming.
Usually it should be configured like

CONFIG += c++11

in one of the pro files.

[bhu24]

@jsulm
i tried that also one by one but no use

1. CONFIG += c++11
2. CONFIG += c++12
3. CONFIG += c++13

[jsulm]

@bhu24 What I mean is: you should check the pro files and see whether the c++ standard is set there and how.
Note: there is no C++12 or C++13

[bhu24]

@jsulm in mqtt.pro file they mentioned c++ standard.

from here i download that file of "qtmqtt"

git clone git://code.qt.io/qt/qtmqtt.git

[jsulm]

@bhu24 Can you show how they mentioned c++ there, I don't want to check out the project.

[bhu24]

@jsulm 

here you can see.
can i uninstall all and again start from new installation
Please help me for selection of qt version, cmake, qmake, and gcc or g++ complier for installation and compilation of "qtmqtt" library.

[jsulm]

@bhu24 Can you try from command line instead of QtCreator?
Go to the qtmqtt source directory:

PATH_TO_YOUR_QT_BIN/qmake
make
make install

Note: use absolute path to qmake to make sure you use Qt you want to use.

[Andarang]

If you're getting the code from GitHub don't forget to checkout a release, otherwise, you'll be working from the dev branch and the code might fail to compile.

so, instead of just
git clone git://code.qt.io/qt/qtmqtt.git

do

git clone git://code.qt.io/qt/qtmqtt.git && git checkout v5.15.0