Consistent with glibc headers, where `noexcept` is used in C++ (or `throw()` in older C++ which llvm-libc doesn't support) in the public function declarations, `__attribute__((__nothrow__))` is used in C for compilers that support it.
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.