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+# Kodi CMake based buildsystem
+
+This files describes Kodi's CMake based buildsystem. CMake is a cross-platform
+tool for generating makefiles as well as project files used by IDEs.
+
+The current version of the buildsystem is capable of building and packaging
+Kodi for the following platforms:
+
+- Linux (GNU Makefiles, Ninja)
+- Windows (NMake Makefiles, Visual Studio 14 (2015), Ninja)
+- macOS and iOS (GNU Makefiles, Xcode, Ninja)
+- Android (GNU Makefiles)
+- FreeBSD (GNU Makefiles)
+
+Before building Kodi with CMake, please ensure that you have the platform
+specific dependencies installed.
+
+While the legacy build systems typically used in-source builds it's recommended
+to use out-of-source builds with CMake. The necessary runtime dependencies such
+as dlls, skins and configuration files are copied over to the build directory
+automatically.
+
+## Dependency installation
+
+### Linux
+
+The dependencies required to build on Linux can be found in
+[docs/README.xxx](https://github.com/xbmc/xbmc/tree/master/docs).
+
+### Raspberry Pi
+
+The cross compilation environment for the Raspberry Pi as well as the
+dependencies have to be installed as explained in
+[docs/README.raspberrypi](https://github.com/xbmc/xbmc/tree/master/docs/README.raspberrypi).
+
+### Windows
+
+For Windows the dependencies can be found in the
+[Wiki](http://kodi.wiki/view/HOW-TO:Compile_Kodi_for_Windows) (Step 1-4). If not already available on your pc, you should
+install the [Windows Software Development Kit (SDK)](https://dev.windows.com/en-us/downloads/sdk-archive) for your Windows version. This is required for HLSL shader offline compiling with the [Effect-Compiler Tool](https://msdn.microsoft.com/de-de/library/windows/desktop/bb232919(v=vs.85).aspx) (fxc.exe).
+
+On Windows, the CMake based buildsystem requires that the binary dependencies
+are downloaded using `DownloadBuildDeps.bat` and `DownloadMingwBuildEnv.bat`
+and that the mingw libs (ffmpeg, libdvd and others) are built using
+`make-mingwlibs.bat`.
+
+### macOS
+
+For macOS the required dependencies can be found in
+[docs/README.osx](https://github.com/xbmc/xbmc/tree/master/docs/README.osx).
+
+On macOS it is necessary to build the dependencies in `tools/depends` using
+`./bootstrap && ./configure --host=<PLATFORM> && make`. The other steps such
+as `make -C tools/depends/target/xbmc` and `make xcode_depends` are not needed
+as these steps are covered already by the CMake project.
+
+### Android
+
+The dependencies needed to compile for Android can be found in
+[docs/README.android](https://github.com/xbmc/xbmc/tree/master/docs/README.android)
+. All described steps have to be executed (except 5.2 which is replaced by the
+respective CMake command below).
+
+## Building Kodi
+
+This section lists the necessary commands for building Kodi with CMake.
+CMake supports different generators that can be classified into two categories:
+single- and multiconfiguration generators.
+
+A single configuration generator (GNU/NMake Makefiles) generates project files
+for a single build type (e.g. Debug, Release) specified at configure time.
+Multi configuration generators (Visual Studio, Xcode) allow to specify the
+build type at compile time.
+
+All examples below are for out-of-source builds with Kodi checked out to
+`<KODI_SRC>`:
+
+```
+mkdir kodi-build && cd kodi-build
+```
+
+### Linux with GNU Makefiles
+
+```
+cmake <KODI_SRC>/project/cmake/
+cmake --build . -- VERBOSE=1 -j$(nproc)  # or: make VERBOSE=1 -j$(nproc)
+./kodi.bin
+```
+
+`CMAKE_BUILD_TYPE` defaults to `Release`.
+
+#### Debian package generation
+The buildsystem is capable of generating Debian packages using CPack. To generate them, `CPACK_GENERATOR` has to be set to *DEB*, i.e. executing CMake's configure step with `-DCPACK_GENERATOR=DEB`.
+You should use CMake/CPack 3.6.0 or higher. Lower versions can generate the packages but package names will be mangled.
+
+The following optional variables (which can be passed to buildsystem when executing cmake with the -D`<variable-name>=<value>` format) can be used to manipulate package type, name and version:
+
+- `DEBIAN_PACKAGE_TYPE` controls the name and version of generated packages. Accepted values are `stable`, `unstable` and `nightly` (default is `nightly`).
+- `DEBIAN_PACKAGE_EPOCH` controls package epoch (default is `2`)
+- `DEBIAN_PACKAGE_VERSION` controls package version (default is `0`)
+- `DEBIAN_PACKAGE_REVISION` controls package revision (no default is set)
+
+Packages metadata can be changed simply by editing files present in the `cpack/deb` folder
+A lot more variables are available (see cpack/CPackDebian.cmake file) but you shouldn't mess with them unless you know what you're doing.
+
+Generated packages can be found in <BUILD_DIR>/packages.
+
+### Raspberry Pi with GNU Makefiles
+
+```
+cmake -DCMAKE_TOOLCHAIN_FILE=<KODI_SRC>/tools/depends/target/Toolchain.cmake <KODI_SRC>/project/cmake/
+cmake --build . -- VERBOSE=1 -j$(nproc)  # or: make VERBOSE=1 -j$(nproc)
+```
+
+### Windows with Visual Studio project files
+
+```
+cmake -G "Visual Studio 14" <KODI_SRC>/project/cmake/
+cmake --build . --config "Debug"  # or: Build solution with Visual Studio
+Debug\kodi.exe
+```
+
+#### Windows installer generation
+
+The script [project/Win32BuildSetup](https://github.com/xbmc/xbmc/blob/master/project/Win32BuildSetup/BuildSetup.bat)
+builds an installable package for Windows.
+
+### Windows with NMake Makefiles
+
+```
+cmake -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release <KODI_SRC>/project/cmake/
+cmake --build .  # or: nmake
+kodi.exe
+```
+
+### macOS with GNU Makefiles
+
+```
+cmake -DCMAKE_TOOLCHAIN_FILE=<KODI_SRC>/tools/depends/target/Toolchain.cmake <KODI_SRC>/project/cmake/
+cmake --build . -- VERBOSE=1 -j$(sysctl -n hw.ncpu)  # or: make VERBOSE=1 -j$(sysctl -n hw.ncpu)
+./kodi.bin
+```
+
+### macOS with Xcode project files
+
+```
+cmake -DCMAKE_TOOLCHAIN_FILE=<KODI_SRC>/tools/depends/target/Toolchain.cmake -G "Xcode" <KODI_SRC>/project/cmake/
+cmake --build . --config "Release" -- -verbose -jobs $(sysctl -n hw.ncpu)  # or: Build solution with Xcode
+./Release/kodi.bin
+```
+
+#### macOS installer generation
+
+Afterwards an installable DMG for macOS can be built with the following command:
+
+```
+cmake --build . --config "Release" --target "dmg"  # or: make dmg
+```
+
+#### iOS package generation
+
+Consequently an installable DEB for iOS can be built with the following command:
+
+```
+make deb
+```
+
+### Android with GNU Makefiles
+
+```
+cmake -DCMAKE_TOOLCHAIN_FILE=<KODI_SRC>/tools/depends/target/Toolchain.cmake <KODI_SRC>/project/cmake/
+cmake --build . -- VERBOSE=1 -j$(nproc)  # or: make VERBOSE=1 -j$(nproc)
+```
+
+#### Android package generation
+
+An installable APK for Android can be built with the following command:
+
+```
+make apk
+```
+
+## Options
+
+Kodi supports a number of build options that can enable or disable certain
+functionality.i These options must be set when running CMake with
+`-DENABLE_<OPTION>=<ON|OFF|AUTO`. The default is `AUTO` which enables
+the option if a certain dependency is found. For example CEC support is
+enabled if libCEC is available. `ON` forcefully enables the dependency
+and the CMake run will fail if the related dependency is not available.
+This is mostly useful for packagers. `OFF` will disable the feature.
+
+Example for forcefully enabling VAAPI and disabling VDPAU:
+
+```
+cmake ... -DENABLE_VAAPI=ON -DENABLE_VDPAU=OFF ...
+```
+
+Example for building with external FFMPEG:
+
+```
+cmake ... -DFFMPEG_PATH=/opt/ffmpeg -DENABLE_INTERNAL_FFMPEG=OFF ...
+```
+
+For more information and an updated list of option, please check the
+main [project/cmake/CMakeLists.txt](https://github.com/xbmc/xbmc/tree/master/project/cmake/CMakeLists.txt).
+
+## Tests
+
+Kodi uses Google Test as its testing framework. Each test file is scanned for tests and these
+are added to CTest, which is the native test driver for CMake.
+
+This scanning happens at configuration time. If tests depend on generated support files which
+should not be scanned, then those support files should be added to the SUPPORT_SOURCES
+variable as opposed to SOURCES before calling core_add_test. You might want to do this where
+the generated support files would not exist at configure time, or if they are so large that
+scanning them would take up an unreasonable amount of configure time.
+
+## Extra targets
+
+When using the makefile builds a few extra targets are defined:
+
+- `make check` builds and executes the test suite.
+- `make check-valgrind` builds and executes the test suite with valgrind memcheck.
+- `make doc` builds the Doxygen documentation.
+
+Code coverage (with Gcov, LCOV and Gcovr) can be built on Linux:
+
+- CMake has to be executed with `-DCMAKE_BUILD_TYPE=Coverage`
+- `make coverage` generates an HTML code coverage report.
+- `make coverage_xml` generates an XML code coverage report.
+
+## Building binary addons
+
+The CMake build system integrates with the addon build system if the GNU
+Makefile generator is used. This offers an easy way to build addons for
+packagers or Kodi developers who don't work on addons.
+
+```
+make binary-addons
+```
+
+Specific addons can be built with:
+
+```
+make binary-addons ADDONS="visualization.spectrum pvr.demo"
+```
+
+Addon developers can build single addons into the Kodi build directory
+so that the addon can be tested with self-compiled specific versions of Kodi.
+
+```
+mkdir pvr.demo-build && cd pvr.demo-build
+cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_PREFIX_PATH=<KODI_BUILD_DIR>/build -DKODI_BUILD_DIR=<KODI_BUILD_DIR> <pvr.demo-SRC>
+make
+```
+
+It is recommended to specify the directories as absolute paths. If relative
+paths are used, they are considered relative to the build directory in which
+`cmake` was executed (aka the current working working directory).
+
+Both methods work only for already existing addons. See this
+[forum thread](http://forum.kodi.tv/showthread.php?tid=219166&pid=1934922#pid1934922)
+and [addons/README.md](https://github.com/xbmc/xbmc/blob/master/project/cmake/addons/README.md)
+for addon development and detailed documentation about the addon build system.
+
+## Sanitizers
+
+Clang and GCC support different kinds of Sanitizers. To enable a Sanitizer call CMake with the
+option `-DECM_ENABLE_SANITIZERS=’san1;san2;...'`. For more information about enabling the
+Sanitizers read the documentation in 
+[modules/extra/ECMEnableSanitizers.cmake](https://github.com/xbmc/xbmc/tree/master/project/cmake/modules/extra/ECMEnableSanitizers.cmake).
+
+It is also recommended to read the sections about the Sanitizers in the [Clang 
+documentation](http://clang.llvm.org/docs/).
+
+## Debugging the build
+
+This section covers some tips that can be useful for debugging a CMake
+based build.
+
+### Verbosity (show compiler and linker parameters)
+
+In order to see the exact compiler commands `make` and `nmake` can be
+executed with a `VERBOSE=1` parameter.
+
+On Windows, this is unfortunately not enough because `nmake` uses
+temporary files to workaround `nmake`'s command string length limitations.
+In order to see verbose output the file
+[Modules/Platform/Windows.cmake](https://github.com/Kitware/CMake/blob/master/Modules/Platform/Windows.cmake#L40)
+in the local CMake installation has to be adapted by uncommenting these
+lines:
+
+```
+# uncomment these out to debug nmake and borland makefiles
+#set(CMAKE_START_TEMP_FILE "")
+#set(CMAKE_END_TEMP_FILE "")
+#set(CMAKE_VERBOSE_MAKEFILE 1)
+```