In #138329, _GNU_SOURCE was added for Cygwin, but when building Clang standalone against an installed LLVM this definition was not picked up, resulting in undefined strnlen. Follow the documentation in https://llvm.org/docs/CMake.html#embedding-llvm-in-your-project and add the LLVM_DEFINITIONS in standalone projects' cmakes.
LLVM Linker (lld)
This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.
lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.
Benchmarking
In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.
It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz
The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.