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All toolchains have not been updated since 2019... Also linaro website do not advertise them ref: https://www.linaro.org/downloads
CMake build instructions
Recommended usage : Incorporating cpu_features into a CMake project
For API / ABI compatibility reasons, it is recommended to build and use cpu_features in a subdirectory of your project or as an embedded dependency.
This is similar to the recommended usage of the googletest framework ( https://github.com/google/googletest/blob/main/googletest/README.md )
Build and use step-by-step
1- Download cpu_features and copy it in a sub-directory in your project. or add cpu_features as a git-submodule in your project
2- You can then use the cmake command add_subdirectory() to include
cpu_features directly and use the cpu_features target in your project.
3- Add the CpuFeatures::cpu_features target to the target_link_libraries() section of
your executable or of your library.
Disabling tests
CMake default options for cpu_features is Release built type with tests
enabled. To disable testing set cmake BUILD_TESTING variable to OFF.
e.g.
cmake -S. -Bbuild -DBUILD_TESTING=OFF