Cctools 65 |verified|

cctools 65 — Quick Reference & Usage Guide

cctools 65 is a suite of command-line utilities for working with Mach-O binaries, object files, and low-level macOS/iOS linking and runtime features. This guide covers common tools, typical workflows, and examples for inspecting, modifying, and analyzing Mach-O files. (Assumes macOS or a compatible environment with cctools 65 installed.)

Building cctools 65 from Source (modern OS)

Since Apple no longer ships the standalone cctools source in recent Xcodes, you can retrieve it:

git clone https://github.com/apple-oss-distributions/cctools
cd cctools
git checkout cctools-65

Note: Building requires libsyscall headers, llvm (for -arch handling), and often cctools-port patches on non-Apple OSes. cctools 65

For cross-compilation on Linux, use:

git clone https://github.com/tpoechtrager/cctools-port
cd cctools-port/cctools
./configure --target=x86_64-apple-darwin
make

For Open-Source Tooling

Projects like Homebrew, MacPorts, and Corrosion (Rust) now adopt cctools 65 to produce more Apple-compatible binaries. Rust’s rustc can leverage the new linker performance for debug builds on macOS. cctools 65 — Quick Reference & Usage Guide

Key Version Highlights

Release Timeline: cctools 65 was rolled out alongside updates to the LLVM/Clang compiler infrastructure, typically aligning with Xcode version updates.
Architecture Support: Full support for arm64 (Apple Silicon M1, M2, M3, and beyond) alongside x86_64, arm64_32 (for Apple Watch), and legacy 32-bit architectures.
Linker Overhaul: The ld64 linker in cctools 65 features improved link-time optimization (LTO), faster incremental linking, and better handling of large projects with thousands of object files.

C. Cross-Compiling (Linking)

If you are building a toolchain (e.g., for Theos), cctools provides the linker (ld). You would typically invoke this via a compiler wrapper (like clang), but manually it looks like:

ld -arch arm64 -o output_binary input_object.o -lSystem -syslibroot /path/to/SDK

4. Create static library

cc -c a.c b.c
ar rc libmystatic.a a.o b.o
ranlib libmystatic.a

Issue 3: Codesign errors after upgrading

Cause: cctools 65 validates signature requirements more strictly. Note: Building requires libsyscall headers, llvm (for -arch

Solution: Re-sign all embedded frameworks: codesign --force --deep --sign - MyApp.app