Supported languages


CLion comes with two language engines. A complementary clangd-based language engine is used for code highlighting in the editor, code completion, error annotation, some search and navigation actions. CLion's own language engine is the basis for all other smart IDE actions. Both engines work with libc++ and Boost, and correctly handles templates and macros.

C++ features supported by CLion


CLion supports C standards up to C99, C11 is supported partially (C11 keywords are completed: _Thread_local, _Alignas, _Noreturn, _Static_assert, and _Atomic).


Work with files in Objective-C / Objective-C++ added to your CMake project and benefit from the multiple smart features coming from AppCode.

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For your mixed Python/C/C++ projects, CLion brings intelligent Python assistance, including Python support in the editor, Python console, debugging and testing tools.

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The popularity of Rust grows, and thus we offer a Rust plugin in CLion and other JetBrains IDEs. Rust support in CLion comes with Cargo build system, New Project wizard and a debugger.


CLion also supports web technologies and languages out of the box to make your development experience complete. It fully supports JavaScript, XML, HTML, CSS and Markdown, including all code editing and transformation features like syntax highlighting, completion, navigation and refactoring. All the Emmet features are also supported in CLion.


Swift support plugin makes the idea of Swift IDE on Linux possible. Smart coding assistance (with Find Usages, Rename refactoring, Override/Implement code generation, generate type from usage), SourceKit inspections and intentions and even debugging are included.

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Fortran plugin comes with FORTRAN 77 / 90 / 95 / 2003 and 2008 support. The capabilities include smart editor, navigation actions, code analysis and debugger.

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Shell Script

If you need to edit shell scripts while you are working on your C++ project, you can do this with CLion as it bundles the Shell Script plugin.

You can benefit from code highlighting, word and path completion, and even textual Rename.


A plugin for YAML, famous data serialization standard, is bundled and is on by default in CLion. Support for other languages can also be added via plugins (go to Appearance and Behavior | Plugins settings to find out more or set them up during the first IDE launch).