These warnings all come up in code modified by one of my two recent commits c06d0ff806b72b1 and b53da77c505a2d3, and all relate to implicit integer type conversion. In a build of ours with strict compile options two of them became errors. Even without that problem, it's worth fixing them to reduce noise that might hide a more serious warning.
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.