LLVM's C++ API doesn't offer a stability guarantee. This means function signatures can change or be removed between versions, forcing projects to adapt. On the other hand, LLVM has an extensive API surface. When a library like llvm/lib/Y relies functionality from another library, the API is often exported in header files under llvm/include/llvm/X/, even if it is not intended to be user-facing. To be compatible with multiple LLVM versions, many projects rely on #if directives based on the LLVM...
