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Created page with "== JetBrains CLion for programming for KDE == JetBrains CLion (CLion) is a proprietary IDE for C++. For pricing details see https://www.jetbrains.com/clion/buy A screen recording version is available https://www.youtube.com/watch?v=G4CzVfSzv3s https://www.youtube.com/watch?v=_V5AqMj2fWc See also https://community.kde.org/Get_Involved/development/IDE_configuration/CLion == Install CLion == Instal the app "JetBrains Toolbox" https://www.jetbrains.com/toolbox-app > "Do..."
 
Nmariusp (talk | contribs)
 
(9 intermediate revisions by the same user not shown)
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JetBrains CLion (CLion) is a proprietary IDE for C++. For pricing details see https://www.jetbrains.com/clion/buy
JetBrains CLion (CLion) is a proprietary IDE for C++. For pricing details see https://www.jetbrains.com/clion/buy


A screen recording version is available https://www.youtube.com/watch?v=G4CzVfSzv3s https://www.youtube.com/watch?v=_V5AqMj2fWc
A screen recording version is available https://www.youtube.com/watch?v=j2bCBlZLujA https://www.youtube.com/watch?v=G4CzVfSzv3s https://www.youtube.com/watch?v=_V5AqMj2fWc


See also https://community.kde.org/Get_Involved/development/IDE_configuration/CLion
See also https://community.kde.org/Get_Involved/development/IDE_configuration/CLion
Line 53: Line 53:
== Open a KDE project in CLion ==
== Open a KDE project in CLion ==


I configure kdesrc-build to use the CMake build configuration "Debug" in order to be able to use the debugger in the IDE, and I use more than 4 CPU threads. For more details see the wiki page for the IDE [Qt Creator](https://community.kde.org/Get_Involved/development/IDE_configuration/Qt_Creator).
I configure kde-builder to use the CMake build configuration "Debug" in order to be able to use the debugger in the IDE.


<pre>
<pre>
cmake-options -DCMAKE_BUILD_TYPE=Debug
  cmake-options: >
...
    -DCMAKE_BUILD_TYPE=Debug
num-cores 14
</pre>
</pre>


Build a KDE project e.g.
We'll use kcalc as an example KDE module and git repository. First, make sure it was built correctly using <code>kde-builder</code>.
 
<pre>
<pre>
kdesrc-build kcalc
kde-builder kcalc
</pre>
</pre>


Build just the project but with verbose output this time:
Build just the project but with verbose output this time:
<pre>
<pre>
kdesrc-build kcalc --no-src --no-include-dependencies --refresh-build --debug
kde-builder kcalc --no-src --no-include-dependencies --refresh-build --debug
</pre>
</pre>


Line 89: Line 89:


In the "Welcome to CLion" wizard > "Open" > "/home/username/kde/src/kcalc/CMakeLists.txt" > OK. The dialog "Open Project CMakeLists.txt is a project file. Would you like to open the project?" is shown, select "Open as Project". Enable check box "Trust projects in ~/kde/src" > "Trust Project" button. In the "Open Project Wizard" dialog select "OK".
In the "Welcome to CLion" wizard > "Open" > "/home/username/kde/src/kcalc/CMakeLists.txt" > OK. The dialog "Open Project CMakeLists.txt is a project file. Would you like to open the project?" is shown, select "Open as Project". Enable check box "Trust projects in ~/kde/src" > "Trust Project" button. In the "Open Project Wizard" dialog select "OK".
===CMake configure===


Look at the the part that you have written down previously, from the output of <code>kdesrc-build kcalc --debug ...</code> .
Look at the the part that you have written down previously, from the output of <code>kdesrc-build kcalc --debug ...</code> .
Line 101: Line 103:
Convert using a text editor and text replace:
Convert using a text editor and text replace:
<pre>
<pre>
                Setting environment variable QT_PLUGIN_PATH to /home/username/kde/usr/lib64/plugins:/home/username/kde/usr/lib/plugins
        Setting environment variable QT_PLUGIN_PATH to /home/username/kde/usr/lib64/plugins:/home/username/kde/usr/lib/plugins
Setting environment variable XDG_DATA_DIRS to /home/username/kde/usr/share:/home/username/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
Setting environment variable XDG_DATA_DIRS to /home/username/kde/usr/share:/home/username/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
         Setting environment variable PATH to /home/username/kde/usr/bin:/home/username/Qt/6.6.1/gcc_64/bin:/home/username/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/username/.local/share/JetBrains/Toolbox/scripts
         Setting environment variable PATH to /home/username/kde/usr/bin:/home/username/Qt/6.6.1/gcc_64/bin:/home/username/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/username/.local/share/JetBrains/Toolbox/scripts
Line 120: Line 122:
CMAKE_MODULE_PATH=/home/username/Qt/6.6.1/gcc_64/lib/cmake:/home/username/kde/usr/lib64/cmake:/home/username/kde/usr/lib/cmake
CMAKE_MODULE_PATH=/home/username/Qt/6.6.1/gcc_64/lib/cmake:/home/username/kde/usr/lib64/cmake:/home/username/kde/usr/lib/cmake
</pre>
</pre>
Select the text block above and in "Environment:", click on the button at the right side of the edit box with tooltip "Edit environment variables (Shift+Enter)". Click on the button with the tooltip "Paste". Press "OK" button.
Save the text block above to file <code>~/kde/clion-cmake.txt</code>. The same text block will be needed when opening in CLion other KDE project.
 
Copy to clipboard the content of the file <code>~/kde/clion-cmake.txt</code>. In "Environment:" on the button at the right side of the edit box with tooltip "Edit environment variables (Shift+Enter)". Click on the button with the tooltip "Paste". Press "OK" button.


<pre>
<pre>
Line 128: Line 132:
From the CLion main menu > Build > Rebuild "kcalc".
From the CLion main menu > Build > Rebuild "kcalc".


From the CLion main menu > Run > Edit Configurations... > kcalc > Environment variables: > use the button with the tooltip "Paste" to paste the same text block as above in the "Settings > Build, Execution, Deployment" >"Environment:".
===Run===
 
<pre>
cat ~/kde/build/kcalc/prefix.sh
</pre>
says:
<pre>
export PATH=/home/username/kde/usr/bin:$PATH
export XDG_DATA_DIRS=/home/username/kde/usr/share:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}
export XDG_CONFIG_DIRS=/home/username/kde/usr/etc/xdg:${XDG_CONFIG_DIRS:-/etc/xdg}
export QT_PLUGIN_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/plugins:$QT_PLUGIN_PATH
export QML2_IMPORT_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml:$QML2_IMPORT_PATH
export QT_QUICK_CONTROLS_STYLE_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml/QtQuick/Controls.2/:$QT_QUICK_CONTROLS_STYLE_PATH
export MANPATH=/home/username/kde/usr/share/man:${MANPATH:-/usr/local/share/man:/usr/share/man}
export SASL_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/sasl2:${SASL_PATH:-/usr/lib/x86_64-linux-gnu/sasl2}
</pre>
 
Run:
<pre>
source ~/kde/build/kcalc/prefix.sh
 
echo PATH=$PATH
echo XDG_DATA_DIRS=$XDG_DATA_DIRS
echo XDG_CONFIG_DIRS=$XDG_CONFIG_DIRS
echo QT_PLUGIN_PATH=$QT_PLUGIN_PATH
echo QML2_IMPORT_PATH=$QML2_IMPORT_PATH
echo QT_QUICK_CONTROLS_STYLE_PATH=$QT_QUICK_CONTROLS_STYLE_PATH
echo MANPATH=$MANPATH
echo SASL_PATH=$SASL_PATH
</pre>
says:
<pre>
PATH=/home/username/kde/usr/bin:/home/username/.local/bin:/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/username/.local/share/JetBrains/Toolbox/scripts
XDG_DATA_DIRS=/home/username/kde/usr/share:/usr/local/share:/usr/share:/var/lib/snapd/desktop
XDG_CONFIG_DIRS=/home/username/kde/usr/etc/xdg:/home/username/.config/kdedefaults:/etc/xdg
QT_PLUGIN_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/plugins:
QML2_IMPORT_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml:
QT_QUICK_CONTROLS_STYLE_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml/QtQuick/Controls.2/:
MANPATH=/home/username/kde/usr/share/man:/usr/local/share/man:/usr/share/man
SASL_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/sasl2:/usr/lib/x86_64-linux-gnu/sasl2
</pre>
 
Save the text block above to file <code>~/kde/expanded-prefix-sh.txt</code>. The same text block will be needed when opening in the IDE JetBrains CLion other KDE projects. The content of this file is also needed when running or debugging a KDE project in other IDEs e.g. Qt Creator.
 
Copy to clipboard the content of the file <code>~/kde/expanded-prefix-sh.txt</code>. From the CLion main menu > Run > Edit Configurations... > kcalc. In "Environment variables:" click on the button at the right side of the edit box with tooltip "Edit environment variables (Shift+Enter)". Click on the button with the tooltip "Paste" to paste from the clipboard. Press "OK" button twice.


Now you can run kcalc correctly, from the CLion main menu > Run > Run 'kcalc' Shift + F10.
Now you can run kcalc correctly, from the CLion main menu > Run > Run 'kcalc' Shift + F10.
Line 134: Line 182:
Now you can debug kcalc correctly, from the CLion main menu > Run > Debug 'kcalc' Shift + F9.
Now you can debug kcalc correctly, from the CLion main menu > Run > Debug 'kcalc' Shift + F9.


If CLion starts the process kcalc (for running or for debugging), you can make sure that the process was started correctly. In Clion >  in the bottom left button "Debug Alt+5" > tab "GDB" > run the command <code>info proc</code>. It says:
As a test that CLion runs kcalc correctly, in CLion, start debugging the process kcalc and pause the debugger e.g. by pressing the pause program kcalc button. In the bottom left button "Debug Alt+5" > tab "GDB" > run the command <code>info proc</code>. It says:
<pre>
<pre>
(gdb) info proc
(gdb) info proc
Line 147: Line 195:
xargs -0 printf %s\\n < /proc/89954/environ
xargs -0 printf %s\\n < /proc/89954/environ
</pre>
</pre>
The value of the environment variables should be the same as in part that you have written down previously from the output of <code>kdesrc-build kcalc --debug ...</code>.
Make sure that the value of the environment variables is correct.
 
==See also==
https://community.kde.org/User:Nmariusp/Qt_Creator

Latest revision as of 23:43, 22 December 2024

JetBrains CLion for programming for KDE

JetBrains CLion (CLion) is a proprietary IDE for C++. For pricing details see https://www.jetbrains.com/clion/buy

A screen recording version is available https://www.youtube.com/watch?v=j2bCBlZLujA https://www.youtube.com/watch?v=G4CzVfSzv3s https://www.youtube.com/watch?v=_V5AqMj2fWc

See also https://community.kde.org/Get_Involved/development/IDE_configuration/CLion

Install CLion

Instal the app "JetBrains Toolbox" https://www.jetbrains.com/toolbox-app > "Download .tar.gz (Linux 64-bit x86)". A file such as https://download-cdn.jetbrains.com/toolbox/jetbrains-toolbox-2.1.3.18901.tar.gz will be downloaded. Download it to the directory ~/Downloads.

mkdir -p ~/.opt/jetbrains-toolbox
cd ~/Downloads
tar -xzvf jetbrains-toolbox-2.1.3.18901.tar.gz -C ~/.opt/jetbrains-toolbox --strip-components=1

Execute ~/.opt/jetbrains-toolbox/jetbrains-toolbox. E.g.:

~/.opt/jetbrains-toolbox/jetbrains-toolbox &

The "Welcome to Toolbox App" first run wizard is shown > Continue > Accept License Agreement > Dark > Get Started.

The main window of the app "JetBrains Toolbox" is shown. From the button with gear icon and tooltip "Toolbox App Menu" > "Quit Ctrl+Q".

In your start menu you will now have the application "JetBrains Toolbox", which is actually installed in ~/.local/share/JetBrains/Toolbox/bin/jetbrains-toolbox.

From the start menu, open the application "JetBrains Toolbox". From the "Tools" tab > Available > "CLion A cross-platform C and C++ IDE" > "Install" button.

In your start menu you will now have the application "CLion A cross-platform C and C++ IDE", which is actually installed in ~/.local/share/JetBrains/Toolbox/apps/clion/bin/clion.sh.

Alternative installation instructions

E.g. from the official webpage of CLion, select "Get Free 30-day Trial". A file such as https://download-cdn.jetbrains.com/cpp/CLion-2023.2.1.tar.gz will be downloaded. Download it to the directory ~/Downloads.

mkdir -p ~/.opt/clion
cd ~/Downloads
tar -xzvf CLion-2023.2.1.tar.gz -C ~/.opt/clion --strip-components=1

Execute ~/.opt/clion/bin/clion.sh. E.g.:

~/.opt/clion/bin/clion.sh &

First run

When CLion starts for the first time, the dialog "Import CLion Settings" is shown, select "Do not import settings", OK. Data Sharing dialog > "Don't Send".

The "Licenses" dialog is shown, select the radio button "Start trial", click on the "Start Trial" button, click on the "Continue" button.

The CLion application is started. Make sure that you have in the start menu the app "CLion A cross-platform C and C++ IDE". If you do not have it, you can create a desktop entry, from the CLion main menu > Tools > Create Desktop Entry. Now you can start CLion from the start menu (e.g. from the KDE Application Launcher or from krunner).

Open a KDE project in CLion

I configure kde-builder to use the CMake build configuration "Debug" in order to be able to use the debugger in the IDE.

  cmake-options: >
    -DCMAKE_BUILD_TYPE=Debug

We'll use kcalc as an example KDE module and git repository. First, make sure it was built correctly using kde-builder.

kde-builder kcalc

Build just the project but with verbose output this time:

kde-builder kcalc --no-src --no-include-dependencies --refresh-build --debug

Look at the output, write down the part similar to:

        Running cmake targeting Kate - Ninja...
        cd /home/username/kde/build/kcalc

run_logged_command(): Module kcalc, Command: cmake -B . -S /home/username/kde/src/kcalc -G Kate - Ninja -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=ON -DCMAKE_BUILD_TYPE=Debug -DQT_NO_CAST_FROM_ASCII=ON -DQT_NO_CAST_TO_ASCII=ON -DBUILD_WITH_QT6=ON -DCMAKE_CXX_FLAGS:STRING=-pipe -DCMAKE_INSTALL_PREFIX=/home/username/kde/usr -DCMAKE_PREFIX_PATH=/home/username/Qt/6.6.1/gcc_64
                Setting environment variable QT_PLUGIN_PATH to /home/username/kde/usr/lib64/plugins:/home/username/kde/usr/lib/plugins
Setting environment variable XDG_DATA_DIRS to /home/username/kde/usr/share:/home/username/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
        Setting environment variable PATH to /home/username/kde/usr/bin:/home/username/Qt/6.6.1/gcc_64/bin:/home/username/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/username/.local/share/JetBrains/Toolbox/scripts
        Setting environment variable PKG_CONFIG_PATH to /home/username/kde/usr/lib/pkgconfig:/home/username/Qt/6.6.1/gcc_64/lib/pkgconfig
        Setting environment variable CMAKE_PREFIX_PATH to /home/username/Qt/6.6.1/gcc_64:/home/username/kde/usr
        Setting environment variable LD_LIBRARY_PATH to /home/username/kde/usr/lib:/home/username/Qt/6.6.1/gcc_64/lib
        Setting environment variable CMAKE_MODULE_PATH to /home/username/Qt/6.6.1/gcc_64/lib/cmake:/home/username/kde/usr/lib64/cmake:/home/username/kde/usr/lib/cmake
# kdesrc-build running: 'cmake' '-B' '.' '-S' '/home/username/kde/src/kcalc' '-G' 'Kate - Ninja' '-DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=ON' '-DCMAKE_BUILD_TYPE=Debug' '-DQT_NO_CAST_FROM_ASCII=ON' '-DQT_NO_CAST_TO_ASCII=ON' '-DBUILD_WITH_QT6=ON' '-DCMAKE_CXX_FLAGS:STRING=-pipe' '-DCMAKE_INSTALL_PREFIX=/home/username/kde/usr' '-DCMAKE_PREFIX_PATH=/home/username/Qt/6.6.1/gcc_64'
# from directory: /home/username/kde/build/kcalc

In the "Welcome to CLion" wizard > "Open" > "/home/username/kde/src/kcalc/CMakeLists.txt" > OK. The dialog "Open Project CMakeLists.txt is a project file. Would you like to open the project?" is shown, select "Open as Project". Enable check box "Trust projects in ~/kde/src" > "Trust Project" button. In the "Open Project Wizard" dialog select "OK".

CMake configure

Look at the the part that you have written down previously, from the output of kdesrc-build kcalc --debug ... . In the CLion main menu > File > Settings > Build, Execution, Deployment > CMake > select the "Profile" named "Debug". "Build directory:" "/home/username/kde/build/kcalc". You can find the build directory above in the part "cd /home/username/kde/build/kcalc".

CMake options:

-G "Kate - Ninja" -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=ON -DCMAKE_BUILD_TYPE=Debug -DQT_NO_CAST_FROM_ASCII=ON -DQT_NO_CAST_TO_ASCII=ON -DBUILD_WITH_QT6=ON -DCMAKE_CXX_FLAGS:STRING=-pipe -DCMAKE_INSTALL_PREFIX=/home/username/kde/usr -DCMAKE_PREFIX_PATH=/home/username/Qt/6.6.1/gcc_64

You can find the value of "CMake options:" above in the part ", Command: cmake -B ". Ignore the command line parameters "-B" and "-S" and paste the rest of the cmake command line into "CMake options:".

Convert using a text editor and text replace:

        Setting environment variable QT_PLUGIN_PATH to /home/username/kde/usr/lib64/plugins:/home/username/kde/usr/lib/plugins
Setting environment variable XDG_DATA_DIRS to /home/username/kde/usr/share:/home/username/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
        Setting environment variable PATH to /home/username/kde/usr/bin:/home/username/Qt/6.6.1/gcc_64/bin:/home/username/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/username/.local/share/JetBrains/Toolbox/scripts
        Setting environment variable PKG_CONFIG_PATH to /home/username/kde/usr/lib/pkgconfig:/home/username/Qt/6.6.1/gcc_64/lib/pkgconfig
        Setting environment variable CMAKE_PREFIX_PATH to /home/username/Qt/6.6.1/gcc_64:/home/username/kde/usr
        Setting environment variable LD_LIBRARY_PATH to /home/username/kde/usr/lib:/home/username/Qt/6.6.1/gcc_64/lib
        Setting environment variable CMAKE_MODULE_PATH to /home/username/Qt/6.6.1/gcc_64/lib/cmake:/home/username/kde/usr/lib64/cmake:/home/username/kde/usr/lib/cmake

by replacing " Setting environment variable " with "", and by replacing " to " with "=" to:

QT_PLUGIN_PATH=/home/username/kde/usr/lib64/plugins:/home/username/kde/usr/lib/plugins
XDG_DATA_DIRS=/home/username/kde/usr/share:/home/username/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
PATH=/home/username/kde/usr/bin:/home/username/Qt/6.6.1/gcc_64/bin:/home/username/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/username/.local/share/JetBrains/Toolbox/scripts
PKG_CONFIG_PATH=/home/username/kde/usr/lib/pkgconfig:/home/username/Qt/6.6.1/gcc_64/lib/pkgconfig
CMAKE_PREFIX_PATH=/home/username/Qt/6.6.1/gcc_64:/home/username/kde/usr
LD_LIBRARY_PATH=/home/username/kde/usr/lib:/home/username/Qt/6.6.1/gcc_64/lib
CMAKE_MODULE_PATH=/home/username/Qt/6.6.1/gcc_64/lib/cmake:/home/username/kde/usr/lib64/cmake:/home/username/kde/usr/lib/cmake

Save the text block above to file ~/kde/clion-cmake.txt. The same text block will be needed when opening in CLion other KDE project.

Copy to clipboard the content of the file ~/kde/clion-cmake.txt. In "Environment:" on the button at the right side of the edit box with tooltip "Edit environment variables (Shift+Enter)". Click on the button with the tooltip "Paste". Press "OK" button.

rm -rf ~/kde/build/kcalc

In the bottom left select the button with the tooltip "CMake", this will open the CMake tool window. Press the button with tooltip "Clear All", press the "Reload CMake Project" button. Make sure that the output is correct. From the CLion main menu > Build > Rebuild "kcalc".

Run

cat ~/kde/build/kcalc/prefix.sh

says:

export PATH=/home/username/kde/usr/bin:$PATH
export XDG_DATA_DIRS=/home/username/kde/usr/share:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}
export XDG_CONFIG_DIRS=/home/username/kde/usr/etc/xdg:${XDG_CONFIG_DIRS:-/etc/xdg}
export QT_PLUGIN_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/plugins:$QT_PLUGIN_PATH
export QML2_IMPORT_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml:$QML2_IMPORT_PATH
export QT_QUICK_CONTROLS_STYLE_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml/QtQuick/Controls.2/:$QT_QUICK_CONTROLS_STYLE_PATH
export MANPATH=/home/username/kde/usr/share/man:${MANPATH:-/usr/local/share/man:/usr/share/man}
export SASL_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/sasl2:${SASL_PATH:-/usr/lib/x86_64-linux-gnu/sasl2}

Run:

source ~/kde/build/kcalc/prefix.sh

echo PATH=$PATH
echo XDG_DATA_DIRS=$XDG_DATA_DIRS
echo XDG_CONFIG_DIRS=$XDG_CONFIG_DIRS
echo QT_PLUGIN_PATH=$QT_PLUGIN_PATH
echo QML2_IMPORT_PATH=$QML2_IMPORT_PATH
echo QT_QUICK_CONTROLS_STYLE_PATH=$QT_QUICK_CONTROLS_STYLE_PATH
echo MANPATH=$MANPATH
echo SASL_PATH=$SASL_PATH

says:

PATH=/home/username/kde/usr/bin:/home/username/.local/bin:/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/username/.local/share/JetBrains/Toolbox/scripts
XDG_DATA_DIRS=/home/username/kde/usr/share:/usr/local/share:/usr/share:/var/lib/snapd/desktop
XDG_CONFIG_DIRS=/home/username/kde/usr/etc/xdg:/home/username/.config/kdedefaults:/etc/xdg
QT_PLUGIN_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/plugins:
QML2_IMPORT_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml:
QT_QUICK_CONTROLS_STYLE_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/qml/QtQuick/Controls.2/:
MANPATH=/home/username/kde/usr/share/man:/usr/local/share/man:/usr/share/man
SASL_PATH=/home/username/kde/usr/lib/x86_64-linux-gnu/sasl2:/usr/lib/x86_64-linux-gnu/sasl2

Save the text block above to file ~/kde/expanded-prefix-sh.txt. The same text block will be needed when opening in the IDE JetBrains CLion other KDE projects. The content of this file is also needed when running or debugging a KDE project in other IDEs e.g. Qt Creator.

Copy to clipboard the content of the file ~/kde/expanded-prefix-sh.txt. From the CLion main menu > Run > Edit Configurations... > kcalc. In "Environment variables:" click on the button at the right side of the edit box with tooltip "Edit environment variables (Shift+Enter)". Click on the button with the tooltip "Paste" to paste from the clipboard. Press "OK" button twice.

Now you can run kcalc correctly, from the CLion main menu > Run > Run 'kcalc' Shift + F10.

Now you can debug kcalc correctly, from the CLion main menu > Run > Debug 'kcalc' Shift + F9.

As a test that CLion runs kcalc correctly, in CLion, start debugging the process kcalc and pause the debugger e.g. by pressing the pause program kcalc button. In the bottom left button "Debug Alt+5" > tab "GDB" > run the command info proc. It says:

(gdb) info proc
process 89954
cmdline = '/home/username/kde/build/kcalc/bin/kcalc'
cwd = '/home/username/kde/build/kcalc/bin'
exe = '/home/username/kde/build/kcalc/bin/kcalc'

In a terminal:

xargs -0 printf %s\\n < /proc/89954/environ

Make sure that the value of the environment variables is correct.

See also

https://community.kde.org/User:Nmariusp/Qt_Creator