The CLion is a cross-platform C/C++ IDE for Linux, OS X, and Windows integrated with the CMake build system. The initial version will support the GCC and Clang compilers and GDB debugger. Clion includes such features as a smart editor, code quality assurance, automated refactorings, project manager, integrated version control systems.

Refer to the CLion Documentation page for more detailed information.



Integration process consists of these steps:

  1. Open system Terminal and install PlatformIO Core
  2. Create new folder for your project and change directory (cd) to it
  3. Generate a project using PIO Core Project Generator (platformio init --ide)
  4. Import project in IDE.

Choose board ID using platformio boards or Embedded Boards Explorer command and generate project via platformio init --ide command:

platformio init --ide clion --board <ID>

# For example, generate project for Arduino UNO
platformio init --ide clion --board uno


  1. Place source files (*.c, *.cpp, *.h, *.hpp) to src directory and repeat platformio init --ide command above (to refresh source files list)
  2. Import this project via Menu: File > Import Project and specify root directory where is located Project Configuration File platformio.ini
  3. Open source file from src directory
  4. Build project (DO NOT use “Run” button, see marks on the screenshot above): Menu: Run > Build.


  1. PlatformIO Core DOES NOT depend on Cmake, it has own cross-platform Build System. All data related to build flags and source code filtering should be specified using Build options in Project Configuration File platformio.ini.

2. See know issue: Arduino .ino files are not supported and how to resolve it.

There are 6 predefined targets for building (NOT FOR RUNNING, see marks on the screenshot above):

  • PLATFORMIO_BUILD - Build project without auto-uploading
  • PLATFORMIO_UPLOAD - Build and upload (if no errors)
  • PLATFORMIO_CLEAN - Clean compiled objects
  • PLATFORMIO_TEST - PIO Unit Testing
  • PLATFORMIO_PROGRAM - Build and upload using external programmer (if no errors), see Upload using Programmer
  • PLATFORMIO_UPLOADFS - Upload files to file system SPIFFS, see Uploading files to file system SPIFFS
  • PLATFORMIO_UPDATE - Update installed platforms and libraries via platformio update
  • PLATFORMIO_REBUILD_PROJECT_INDEX - Rebuild C/C++ Index for the Project. Allows to fix code completion and code linting issues.

PlatformIO Project Generator created “File Watchers” configuration to monitor changes in platformio.ini and automatically rebuild C/C++ Project Index. You need to install extra plugin named File Watchers via “Clion: Preferences > Plugins” to enable this feature.


The libraries which are added, installed or used in the project after generating process will not be reflected in IDE. To fix it please run PLATFORMIO_REBUILD_PROJECT_INDEX target.

Known issues

Arduino .ino files are not supported

CLion uses “CMake” tool for code completion and code linting. As result, it doesn’t support Arduino files (*.ino and .pde) because they are not valid C/C++ based source files:

  1. Missing includes such as #include <Arduino.h>
  2. Function declarations are omitted.

See how to Convert Arduino file to C++ manually.