Debug information formatsīy default, a DWARF debug information repository is created during the install phase this is a 'bundle' named

Set the XNU_LOGCOLORS environment variable to y, or you can pass LOGCOLORS=y to the make command. The XNU build system can optionally output color-formatted build output. $ make BUILD_JSON_COMPILATION_DATABASE=1 # Build Clang JSON Compilation Database.$ make BUILD_LTO=0 # build without LLVM Link Time Optimization.$ make -w # trace recursive make invocations.$ make -j8 # the standard command-line option is also accepted.The default is 2x the number of active CPUS. $ make MAKEJOBS=-j8 # this will use 8 processes during the build.$ make ARCH_CONFIGS='X86_64' exporthdrs all The xnu make system can build kernel based on KERNEL_CONFIGS & ARCH_CONFIGS variables as arguments. How to build XNU Building DEVELOPMENT kernel tools - A set of utilities for testing, debugging and profiling kernel.security - Mandatory Access Check policy interfaces and related implementation.pexpert - Platform specific code like interrupt handling, atomics etc.makedefs - top level rules and defines for kernel build.libkdd - source for user library for parsing kernel data like kernel chunked data.libsyscall - syscall library interface for userspace programs.libsa - kernel bootstrap code for startup.libkern - C++ IOKit library code for handling of drivers and kexts.

These headers should be regularly synced when source is updated.

EXTERNAL_HEADERS - Headers sourced from other projects to avoid dependency cycles when building.

SETUP - Basic set of tools used for configuring the kernel, versioning and kextsymbol management.

config - configurations for exported apis for supported architecture and platform.

XNU runs on x86_64 for both single processor and multi-processor configurations. XNU is a hybrid kernel combining the Mach kernel developed at Carnegie Mellon University with components from FreeBSD and C++ API for writing drivers called IOKit.

XNU kernel is part of the Darwin operating system for use in macOS and iOS operating systems.

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