40ae296bc3
`dispatch_async_and_wait()` was introduced in macOS 10.14. Let's forward declare it to ensure we can compile the test with older SDKs and guard execution by checking if the symbol is available. (We can't use `__builtin_available()`, because that itself requires a higher minimum deployment target.) We also need to specify the `-undefined dynamic_lookup` compiler flag. Differential Revision: https://reviews.llvm.org/D85995
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. ================================