CLion comes with two language engines. A complementary clangd-based language engine is used for code highlighting in the editor, 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.
CLion supports C standards up to C99, C11 is supported partially (C11 keywords are completed: _Thread_local, _Alignas, _Noreturn, _Static_assert, and _Atomic).
For your mixed Python/C/C++ projects, CLion brings intelligent Python assistance, including Python support in the editor, Python console, debugging and testing tools.
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.
Fortran plugin comes with FORTRAN 77 / 90 / 95 / 2003 and 2008 support. The capabilities include smart editor, navigation actions, code analysis and debugger.
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
Behavior | Plugins settings to find out more or set them up during the first IDE launch).