scripts/linux/setup-toolchain.py, run once as root, builds into
/opt/unixnu-linux (or PREFIX, or $UNIXNU_TOOLCHAIN):
- clang from llvm-project 58c46bae2118 with llvm-xnu-builtin-type.patch,
which adds __builtin_xnu_type_signature, __builtin_xnu_type_summary,
__builtin_xnu_types_compatible and xnu_usage_semantics; kalloc.h uses
the builtins with no fallback;
- cctools-port 1030.6.3-ld64-956.6 (its master, ld64-609, corrupts the
kernel link), with libdispatch for ld64;
- mig and migcom from bootstrap_cmds-138;
- iig-port, with iig-port-darwin-target.patch;
- xnu-host-cc, the host compiler for xnu's SETUP tools;
- lzfse for the kernelcache.
It installs the Command Line Tools shims (clang, clang++, cc, install,
gm4) under the prefix and xcrun, plutil and codesign in /usr/bin, where
xnu's makefiles call them. libmacho.a and libstuff.a go to /usr/lib and
libdispatch to /usr/local. Each step is skipped when its output exists.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
