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Sep 21, 2025
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Document Policy on supporting newer C++ standard in LLVM codebase #156823

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Document Policy on supporting newer C++ standard in LLVM codebase
joker-eph Sep 4, 2025
d2c0249
Update llvm/docs/CodingStandards.rst
joker-eph Sep 5, 2025
6c00faf
Update llvm/docs/CodingStandards.rst
joker-eph Sep 21, 2025
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4 changes: 2 additions & 2 deletions llvm/docs/CMake.rst
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Expand Up @@ -280,8 +280,8 @@ explanation and LLVM-related notes. For full documentation, consult the CMake
manual, or execute ``cmake --help-variable VARIABLE_NAME``.

**CMAKE_CXX_STANDARD**:STRING
Sets the C++ standard to conform to when building LLVM. Possible values are
17 and 20. LLVM requires C++17 or higher. This defaults to 17.
Sets the C++ standard to conform to when building LLVM.
LLVM requires C++17 or higher. This defaults to 17.

**CMAKE_INSTALL_BINDIR**:PATH
The path to install executables, relative to the *CMAKE_INSTALL_PREFIX*.
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6 changes: 6 additions & 0 deletions llvm/docs/CodingStandards.rst
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Expand Up @@ -78,6 +78,12 @@ Each toolchain provides a good reference for what it accepts:
Additionally, there are compiler comparison tables of supported C++ features on
`cppreference.com <https://en.cppreference.com/w/cpp/compiler_support/17>`_.

To keep track with the evolution of the standard, newer C++ version can be used
to build LLVM. However, our support focuses on the minimum supported C++
version and a very recent standard may not be yet supported, or only using the
latest version of the supported toolchains and possibly not across all the
subprojects.


C++ Standard Library
--------------------
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