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What are the most important and known issues and limitations?

General

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System requirements
  • CLion only runs on 64bit systems
CMake
  • CMakeCache changes should be applied via Apply Changes and Reload CMake project button in the tool window.

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  • CLion supports only GNU toolchain, that means only GCC and Clang compilers on Linux and OS X, and MinGW (or MinGW-W64) and Cygwin x64 toolchains on Windows. Microsoft Visual C++ compiler is supported in the experimental mode since CLion 2017.1.
    Note: If you are using Visual Studio for C++ development (and Visual C++ Compiler), try our ReSharper for C++.
C++
CLion supports

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the following C and C++ standards: C99, C11 partially, C++03, C++11

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, C++14 (all except constexpr), C++17 (initial support).
List of supported C++

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  • User defined literals
  • Constexprs
  • Variadic templates
language features can be found in our webhelp.
Performance and memory
  • On the large code bases (especially when using Boost) performance and memory issues during indexing and editing are possible.
  • Increasing memory may help to resolve performance problems. To check the memory usage, please, switch on the memory indicator in Preferences/Settings | Appearance & Behavior | Appearance | Show memory indicator.

(info) To report  While reporting a performance problem, please, use the instruction hereget a thread dump and a CPU snapshot and attach them to the report/ticket in tracker.

(info) To find IDE logs to attach to the problem use this link.

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  • Some issues are possible when debugging 32-bit projects with 64-bit GDB.

(info) To report debugger problem, please, configure and collect debug logs