You can inspect and pull the raw code directly from the official Apple Open Source Library.
Apple frequently updates its open-source toolchain. Version increments generally align with major Xcode and operating system releases to support new processor architectures, code-signing rules, and system ABIs. How to get the full version safely: cctools 65 download full
If you are building on a Mac, simply download Xcode or install the Command Line Tools by opening your terminal and typing xcode-select --install . You can inspect and pull the raw code
This package includes vital low-level developer tools like ld (the linker), strip (to reduce file size), otool (to inspect object files), and nm (to display symbol tables). strip (to reduce file size)