This is a replacement for GCC libatomic. It's ABI-compatible with libatomic and provides the same compiler helpers and other APIs.
It does not come with a header file. Its purposes are two:
- to provide a compatibility library for existing binaries
- to provide emulation symbols for compiler intrinsics
To build and install it, just use the supplied Makefile, or compile it by hand. The Clang compiler is needed to build this; it may not compile with GCC.
The code is based on atomic.c from LLVM's compiler-rt, and therefore is
available under the same license (Apache-2.0). Extra implementations have been
added for completeness/compatibility with GCC libatomic.