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+# CMake Build System Overview
+
+[TOC]
+
+This document provides a general layout of the Draco CMake build system.
+
+## Core Build System Files
+
+These files are listed in order of interest to maintainers of the build system.
+
+-   `CMakeLists.txt` is the main driver of the build system. It's responsible
+    for defining targets and source lists, surfacing build system options, and
+    tying the components of the build system together.
+
+-   `cmake/draco_build_definitions.cmake` defines the macro
+    `draco_set_build_definitions()`, which is called from `CMakeLists.txt` to
+    configure include paths, compiler and linker flags, library settings,
+    platform speficic configuration, and other build system settings that
+    depend on optional build configurations.
+
+-   `cmake/draco_targets.cmake` defines the macros `draco_add_library()` and
+    `draco_add_executable()` which are used to create all targets in the CMake
+    build. These macros attempt to behave in a manner that loosely mirrors the
+    blaze `cc_library()` and `cc_binary()` commands. Note that
+    `draco_add_executable()` is also used for tests.
+
+-   `cmake/draco_emscripten.cmake` handles Emscripten SDK integration. It
+    defines several Emscripten specific macros that are required to build the
+    Emscripten specific targets defined in `CMakeLists.txt`.
+
+-   `cmake/draco_flags.cmake` defines macros related to compiler and linker
+    flags. Testing macros, macros for isolating flags to specific source files,
+    and the main flag configuration function for the library are defined here.
+
+-   `cmake/draco_options.cmake` defines macros that control optional features
+    of draco, and help track draco library and build system options.
+
+-   `cmake/draco_install.cmake` defines the draco install target.
+
+-   `cmake/draco_cpu_detection.cmake` determines the optimization types to
+    enable based on target system processor as reported by CMake.
+
+-   `cmake/draco_intrinsics.cmake` manages flags for source files that use
+    intrinsics. It handles detection of whether flags are necessary, and the
+    application of the flags to the sources that need them when they are
+    required.
+
+## Helper and Utility Files
+
+-   `.cmake-format.py` Defines coding style for cmake-format.
+
+-   `cmake/draco_helpers.cmake` defines utility macros.
+
+-   `cmake/draco_sanitizer.cmake` defines the `draco_configure_sanitizer()`
+    macro, which implements support for `DRACO_SANITIZE`. It handles the
+    compiler and linker flags necessary for using sanitizers like asan and msan.
+
+-   `cmake/draco_variables.cmake` defines macros for tracking and control of
+    draco build system variables.
+
+## Toolchain Files
+
+These files help facilitate cross compiling of draco for various targets.
+
+-   `cmake/toolchains/aarch64-linux-gnu.cmake` provides cross compilation
+    support for arm64 targets.
+
+-   `cmake/toolchains/android.cmake` provides cross compilation support for
+    Android targets.
+
+-   `cmake/toolchains/arm-linux-gnueabihf.cmake` provides cross compilation
+    support for armv7 targets.
+
+-   `cmake/toolchains/arm64-ios.cmake`, `cmake/toolchains/armv7-ios.cmake`,
+    and `cmake/toolchains/armv7s-ios.cmake` provide support for iOS.
+
+-   `cmake/toolchains/arm64-linux-gcc.cmake` and
+    `cmake/toolchains/armv7-linux-gcc.cmake` are deprecated, but remain for
+    compatibility. `cmake/toolchains/android.cmake` should be used instead.
+
+-   `cmake/toolchains/arm64-android-ndk-libcpp.cmake`,
+    `cmake/toolchains/armv7-android-ndk-libcpp.cmake`,
+    `cmake/toolchains/x86-android-ndk-libcpp.cmake`, and
+    `cmake/toolchains/x86_64-android-ndk-libcpp.cmake` are deprecated, but
+    remain for compatibility. `cmake/toolchains/android.cmake` should be used
+    instead.
+
+-   `cmake/toolchains/i386-ios.cmake` and `cmake/toolchains/x86_64-ios.cmake`
+    provide support for the iOS simulator.
+
+-   `cmake/toolchains/android-ndk-common.cmake` and
+    `cmake/toolchains/arm-ios-common.cmake` are support files used by other
+    toolchain files.
+
+## Template Files
+
+These files are inputs to the CMake build and are used to generate inputs to the
+build system output by CMake.
+
+-   `cmake/draco-config.cmake.template` is used to produce
+    draco-config.cmake. draco-config.cmake can be used by CMake to find draco
+    when another CMake project depends on draco.
+
+-   `cmake/draco.pc.template` is used to produce draco's pkg-config file.
+    Some build systems use pkg-config to configure include and library paths
+    when they depend upon third party libraries like draco.