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These are commonly used on baremetal targets. We disable float support and other features to reduce the binary size. This would ideally eventually be handled using the proposed config mechanism: https://discourse.llvm.org/t/rfc-systematic-way-to-introduce-and-use-libc-config-options/72943 but for now we use a CMake conditional. Differential Revision: https://reviews.llvm.org/D159067
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