SA_ONSTACK is required for certain runtimes that use small stacks, for instance the Go runtime. See https://github.com/golang/go/issues/49075 SA_ONSTACK is a no-op unless someone also calls sigaltstack.
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================