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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.
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