Скачать или смотреть How to Enable /std:c+ + latest in CMake for MSVC Compiler

Discover the idiomatic way to enable `/std:c+ + latest` in CMake for MSVC compilers and harness the latest C+ + features seamlessly.
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How to Enable /std:c+ + latest in CMake for MSVC Compiler

If you are a C+ + developer using CMake and the Microsoft Visual C+ + (MSVC) compiler, you might have encountered the challenge of enabling /std:c+ + latest to access the latest C+ + features. While setting CMAKE_CXX_STANDARD to 17 gives you /std:c+ + 17, the method to enable the latest standard is not immediately clear. This post aims to clarify this issue and guide you through the steps to configure your project correctly.

Understanding the Need for /std:c+ + latest

The /std:c+ + latest flag is essential for developers who wish to utilize the latest features of C+ + , especially since MSVC does not treat /std:c+ + 2a the same way as other compilers like GCC or Clang. Instead, MSVC uses /std:c+ + latest to grant access to features beyond the established C+ + standards. Here's why you might want to enable it:

Access to New Features: Gain the ability to use features from C+ + 20 or 23 which are not fully defined in earlier versions.

Toolchain-Agnostic Development: Ensures your build system can leverage the capabilities of different compilers as they come into maturity.

Setting Up /std:c+ + latest in CMake

Step-by-Step Guidance

Here’s how to enable /std:c+ + latest in your CMake configuration.

Using CMake before Version 3.20.4:

If your version of CMake is 3.20.3 or below, you can simply set CMAKE_CXX_STANDARD to 20, and it will automatically use the /std:c+ + latest option. Here’s how to do that:

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Under the hood, CMake sets the necessary flags as shown in the proof snippet from its source code:

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Using CMake 3.20.4 and Later:

Starting from CMake 3.20.4, simply setting CMAKE_CXX_STANDARD to 20 will not give you /std:c+ + latest. Instead, you need to specify 23 to enable it:

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Ensure your MSVC compiler version is 16.11 Preview 1 or later for this to work correctly.

Example Configuration

Here’s a full example of how your CMakeLists.txt should look for enabling /std:c+ + latest efficiently:

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Conclusion

Enabling /std:c+ + latest in CMake is crucial for developers using MSVC who want to take advantage of the latest advancements in C+ + . By following the guidelines above and ensuring your CMake version and compiler are up to date, you can smoothly configure your project to harness the latest C+ + features. Keep exploring and happy coding!