Due to Clang 11 backend error ("Unsupported library call operation!").
See Buildbot failures:
- https://lab.llvm.org/buildbot/#/builders/104/builds/1105
- https://lab.llvm.org/buildbot/#/builders/71/builds/1100
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.