cmake config_error ai_generated partial

CMake Error: Feature cxx_std_98 is not available. Check that the compiler supports CXX_STANDARD 98.

ID: cmake/unknown-feature-cxx-std-98

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85%Fix Rate
85%Confidence
1Evidence
2023-06-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
CMake 3.27 active — — —
CMake 3.28 active — — —
CMake 3.29 active — — —

Root Cause

CMake 3.1+ removed support for C++98 as a compile feature, so setting CMAKE_CXX_STANDARD to 98 or using cxx_std_98 in target_compile_features causes an error.

generic

中文

CMake 3.1 及以上版本移除了对 C++98 作为编译特性的支持，因此将 CMAKE_CXX_STANDARD 设置为 98 或在 target_compile_features 中使用 cxx_std_98 会导致错误。

Official Documentation

https://cmake.org/cmake/help/latest/manual/cmake-compile-features.7.html

Workarounds

  1. 85% success set(CMAKE_CXX_STANDARD 11) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_CXX_EXTENSIONS OFF) 
    set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
  2. 70% success cmake -version # check current version # Install CMake 3.0 from https://cmake.org/files/v3.0/ 
    cmake -version  # check current version
# Install CMake 3.0 from https://cmake.org/files/v3.0/

中文步骤

  1. set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
  2. cmake -version  # check current version
# Install CMake 3.0 from https://cmake.org/files/v3.0/

Dead Ends

Common approaches that don't work:

  1. 90% fail

    CMake still validates the feature set; setting REQUIRED to OFF only makes it non-fatal but the feature is still unavailable, leading to silent build failures.

  2. 100% fail

    The feature is hardcoded in CMake's internal compiler detection; custom definitions cannot override it.