Cctools 65 Direct

The linker is arguably the most important component. With cctools 65, ld supports:

For developers needing custom patches, compile from the Apple open-source repository: cctools 65

git clone https://github.com/apple-oss-distributions/cctools
cd cctools
git checkout cctools-65
make configure
./configure --prefix=/opt/cctools65
make && make install

otool -hv my_app          # header
otool -L my_lib.dylib     # linked libraries
otool -l my_app | grep -A5 LC_CODE_SIGNATURE

LTO allows the compiler to defer optimization until link time, leading to smaller, faster binaries. However, older versions of cctools suffered from memory bloat during LTO. cctools 65 introduces a new intermediate representation (IR) parser that reduces peak memory usage by up to 30% for LLVM LTO operations. The linker is arguably the most important component

| Feature | GNU binutils (Linux) | cctools (Apple) | |---------|----------------------|------------------| | Object format | ELF | Mach-O | | Universal binaries | No | Yes (lipo) | | Dynamic library naming | SONAME | Install name (install_name_tool) | | Linker | ld.bfd or gold | Apple’s ld (Mach-O specific) | | Dependency tracking | ldd | otool -L | | Codesigning | No | codesign_allocate, etc. | otool -hv my_app # header otool -L my_lib