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+# Compiling GLFW {#compile_guide}
+
+[TOC]
+
+This is about compiling the GLFW library itself.  For information on how to
+build applications that use GLFW, see @ref build_guide.
+
+GLFW uses some C99 features and does not support Visual Studio 2012 and earlier.
+
+
+## Using CMake {#compile_cmake}
+
+GLFW behaves like most other libraries that use CMake so this guide mostly
+describes the standard configure, generate and compile sequence.  If you are already
+familiar with this from other projects, you may want to focus on the @ref
+compile_deps and @ref compile_options sections for GLFW-specific information.
+
+GLFW uses [CMake](https://cmake.org/) to generate project files or makefiles
+for your chosen development environment.  To compile GLFW, first generate these
+files with CMake and then use them to compile the GLFW library. 
+
+If you are on Windows and macOS you can [download
+CMake](https://cmake.org/download/) from their site.
+
+If you are on a Unix-like system such as Linux, FreeBSD or Cygwin or have
+a package system like Fink, MacPorts or Homebrew, you can install its CMake
+package.
+
+CMake is a complex tool and this guide will only show a few of the possible ways
+to set up and compile GLFW.  The CMake project has their own much more detailed
+[CMake user guide][cmake-guide] that includes everything in this guide not
+specific to GLFW.  It may be a useful companion to this one.
+
+[cmake-guide]: https://cmake.org/cmake/help/latest/guide/user-interaction/
+
+
+### Installing dependencies {#compile_deps}
+
+The C/C++ development environments in Visual Studio, Xcode and MinGW come with
+all necessary dependencies for compiling GLFW, but on Unix-like systems like
+Linux and FreeBSD you will need a few extra packages.
+
+
+#### Dependencies for Wayland and X11 {#compile_deps_wayland}
+
+By default, both the Wayland and X11 backends are enabled on Linux and other Unix-like
+systems (except macOS).  To disable one or both of these, set the @ref GLFW_BUILD_WAYLAND
+or @ref GLFW_BUILD_X11 CMake options in the next step when generating build files.
+
+To compile GLFW for both Wayland and X11, you need to have the X11, Wayland and xkbcommon
+development packages installed.  On some systems a few other packages are also required.
+None of the development packages above are needed to build or run programs that use an
+already compiled GLFW library.
+
+On Debian and derivatives like Ubuntu and Linux Mint you will need the `libwayland-dev`
+and `libxkbcommon-dev` packages to compile for Wayland and the `xorg-dev` meta-package to
+compile for X11.  These will pull in all other dependencies.
+
+```sh
+sudo apt install libwayland-dev libxkbcommon-dev xorg-dev
+```
+
+On Fedora and derivatives like Red Hat you will need the `wayland-devel` and
+`libxkbcommon-devel` packages to compile for Wayland and the `libXcursor-devel`,
+`libXi-devel`, `libXinerama-devel` and `libXrandr-devel` packages to compile for X11.
+These will pull in all other dependencies.
+
+```sh
+sudo dnf install wayland-devel libxkbcommon-devel libXcursor-devel libXi-devel libXinerama-devel libXrandr-devel
+```
+
+On FreeBSD you will need the `wayland`, `libxkbcommon` and `evdev-proto` packages to
+compile for Wayland.  The X11 headers are installed along the end-user X11 packages, so if
+you have an X server running you should have the headers as well.  If not, install the
+`xorgproto` package to compile for X11.
+
+```sh
+pkg install wayland libxkbcommon evdev-proto xorgproto
+```
+
+On Cygwin Wayland is not supported but you will need the `libXcursor-devel`,
+`libXi-devel`, `libXinerama-devel`, `libXrandr-devel` and `libXrender-devel` packages to
+compile for X11.  These can be found in the Libs section of the GUI installer and will
+pull in all other dependencies.
+
+Once you have the required dependencies, move on to @ref compile_generate.
+
+
+### Generating build files with CMake {#compile_generate}
+
+Once you have all necessary dependencies it is time to generate the project
+files or makefiles for your development environment.  CMake needs two paths for
+this:
+
+ - the path to the root directory of the GLFW source tree (not its `src`
+   subdirectory)
+ - the path to the directory where the generated build files and compiled
+   binaries will be placed
+
+If these are the same, it is called an in-tree build, otherwise it is called an
+out-of-tree build.
+
+Out-of-tree builds are recommended as they avoid cluttering up the source tree.
+They also allow you to have several build directories for different
+configurations all using the same source tree.
+
+A common pattern when building a single configuration is to have a build
+directory named `build` in the root of the source tree.
+
+
+#### Generating with the CMake GUI {#compile_generate_gui}
+
+Start the CMake GUI and set the paths to the source and build directories
+described above.  Then press _Configure_ and _Generate_.
+
+If you wish change any CMake variables in the list, press _Configure_ and then
+_Generate_ to have the new values take effect.  The variable list will be
+populated after the first configure step.
+
+By default, GLFW will use Wayland and X11 on Linux and other Unix-like systems other than
+macOS.  To disable support for one or both of these, set the @ref GLFW_BUILD_WAYLAND
+and/or @ref GLFW_BUILD_X11 option in the GLFW section of the variable list, then apply the
+new value as described above.
+
+Once you have generated the project files or makefiles for your chosen
+development environment, move on to @ref compile_compile.
+
+
+#### Generating with command-line CMake {#compile_generate_cli}
+
+To make a build directory, pass the source and build directories to the `cmake`
+command.  These can be relative or absolute paths.  The build directory is
+created if it doesn't already exist.
+
+```sh
+cmake -S path/to/glfw -B path/to/build
+```
+
+It is common to name the build directory `build` and place it in the root of the
+source tree when only planning to build a single configuration.
+
+```sh
+cd path/to/glfw
+cmake -S . -B build
+```
+
+Without other flags these will generate Visual Studio project files on Windows
+and makefiles on other platforms.  You can choose other targets using the `-G`
+flag.
+
+```sh
+cmake -S path/to/glfw -B path/to/build -G Xcode
+```
+
+By default, GLFW will use Wayland and X11 on Linux and other Unix-like systems other than
+macOS.  To disable support for one or both of these, set the @ref GLFW_BUILD_WAYLAND
+and/or @ref GLFW_BUILD_X11 CMake option.
+
+```sh
+cmake -S path/to/glfw -B path/to/build -D GLFW_BUILD_X11=0
+```
+
+Once you have generated the project files or makefiles for your chosen
+development environment, move on to @ref compile_compile.
+
+
+### Compiling the library {#compile_compile}
+
+You should now have all required dependencies and the project files or makefiles
+necessary to compile GLFW.  Go ahead and compile the actual GLFW library with
+these files as you would with any other project.
+
+With Visual Studio open `GLFW.sln` and use the Build menu.  With Xcode open
+`GLFW.xcodeproj` and use the Project menu.
+
+With Linux, macOS and other forms of Unix, run `make`.
+
+```sh
+cd path/to/build
+make
+```
+
+With MinGW, it is `mingw32-make`.
+
+```sh
+cd path/to/build
+mingw32-make
+```
+
+Any CMake build directory can also be built with the `cmake` command and the
+`--build` flag.
+
+```sh
+cmake --build path/to/build
+```
+
+This will run the platform specific build tool the directory was generated for.
+
+Once the GLFW library is compiled you are ready to build your application,
+linking it to the GLFW library.  See @ref build_guide for more information.
+
+
+## CMake options {#compile_options}
+
+The CMake files for GLFW provide a number of options, although not all are
+available on all supported platforms.  Some of these are de facto standards
+among projects using CMake and so have no `GLFW_` prefix.
+
+If you are using the GUI version of CMake, these are listed and can be changed
+from there.  If you are using the command-line version of CMake you can use the
+`ccmake` ncurses GUI to set options.  Some package systems like Ubuntu and other
+distributions based on Debian GNU/Linux have this tool in a separate
+`cmake-curses-gui` package.
+
+Finally, if you don't want to use any GUI, you can set options from the `cmake`
+command-line with the `-D` flag.
+
+```sh
+cmake -S path/to/glfw -B path/to/build -D BUILD_SHARED_LIBS=ON
+```
+
+
+### Shared CMake options {#compile_options_shared}
+
+@anchor BUILD_SHARED_LIBS
+__BUILD_SHARED_LIBS__ determines whether GLFW is built as a static library or as
+a DLL / shared library / dynamic library.  This is disabled by default,
+producing a static GLFW library.  This variable has no `GLFW_` prefix because it
+is defined by CMake.  If you want to change the library only for GLFW when it is
+part of a larger project, see @ref GLFW_LIBRARY_TYPE.
+
+@anchor GLFW_LIBRARY_TYPE
+__GLFW_LIBRARY_TYPE__ allows you to override @ref BUILD_SHARED_LIBS only for
+GLFW, without affecting other libraries in a larger project.  When set, the
+value of this option must be a valid CMake library type.  Set it to `STATIC` to
+build GLFW as a static library, `SHARED` to build it as a shared library
+/ dynamic library / DLL, or `OBJECT` to make GLFW a CMake object library.
+
+@anchor GLFW_BUILD_EXAMPLES
+__GLFW_BUILD_EXAMPLES__ determines whether the GLFW examples are built
+along with the library.  This is enabled by default unless GLFW is being built
+as a subproject of a larger CMake project.
+
+@anchor GLFW_BUILD_TESTS
+__GLFW_BUILD_TESTS__ determines whether the GLFW test programs are
+built along with the library.  This is enabled by default unless GLFW is being
+built as a subproject of a larger CMake project.
+
+@anchor GLFW_BUILD_DOCS
+__GLFW_BUILD_DOCS__ determines whether the GLFW documentation is built along
+with the library.  This is enabled by default if
+[Doxygen](https://www.doxygen.nl/) is found by CMake during configuration.
+
+
+### Win32 specific CMake options {#compile_options_win32}
+
+@anchor GLFW_BUILD_WIN32
+__GLFW_BUILD_WIN32__ determines whether to include support for Win32 when compiling the
+library.  This option is only available when compiling for Windows.  This is enabled by
+default.
+
+@anchor USE_MSVC_RUNTIME_LIBRARY_DLL
+__USE_MSVC_RUNTIME_LIBRARY_DLL__ determines whether to use the DLL version or the
+static library version of the Visual C++ runtime library.  When enabled, the
+DLL version of the Visual C++ library is used.  This is enabled by default.
+
+It is recommended to set the standard CMake variable [CMAKE_MSVC_RUNTIME_LIBRARY][]
+instead of this GLFW-specific option.
+
+[CMAKE_MSVC_RUNTIME_LIBRARY]: https://cmake.org/cmake/help/latest/variable/CMAKE_MSVC_RUNTIME_LIBRARY.html
+
+@anchor GLFW_USE_HYBRID_HPG
+__GLFW_USE_HYBRID_HPG__ determines whether to export the `NvOptimusEnablement` and
+`AmdPowerXpressRequestHighPerformance` symbols, which force the use of the
+high-performance GPU on Nvidia Optimus and AMD PowerXpress systems.  These symbols
+need to be exported by the EXE to be detected by the driver, so the override
+will not work if GLFW is built as a DLL.  This is disabled by default, letting
+the operating system and driver decide.
+
+
+### macOS specific CMake options {#compile_options_macos}
+
+@anchor GLFW_BUILD_COCOA
+__GLFW_BUILD_COCOA__ determines whether to include support for Cocoa when compiling the
+library.  This option is only available when compiling for macOS.  This is enabled by
+default.
+
+
+### Unix-like system specific CMake options {#compile_options_unix}
+
+@anchor GLFW_BUILD_WAYLAND
+__GLFW_BUILD_WAYLAND__ determines whether to include support for Wayland when compiling
+the library.  This option is only available when compiling for Linux and other Unix-like
+systems other than macOS.  This is enabled by default.
+
+@anchor GLFW_BUILD_X11
+__GLFW_BUILD_X11__ determines whether to include support for X11 when compiling the
+library.  This option is only available when compiling for Linux and other Unix-like
+systems other than macOS.  This is enabled by default.
+
+
+## Cross-compilation with CMake and MinGW {#compile_mingw_cross}
+
+Both Cygwin and many Linux distributions have MinGW or MinGW-w64 packages.  For
+example, Cygwin has the `mingw64-i686-gcc` and `mingw64-x86_64-gcc` packages
+for 32- and 64-bit version of MinGW-w64, while Debian GNU/Linux and derivatives
+like Ubuntu have the `mingw-w64` package for both.
+
+GLFW has CMake toolchain files in the `CMake` subdirectory that set up
+cross-compilation of Windows binaries.  To use these files you set the
+`CMAKE_TOOLCHAIN_FILE` CMake variable with the `-D` flag add an option when
+configuring and generating the build files.
+
+```sh
+cmake -S path/to/glfw -B path/to/build -D CMAKE_TOOLCHAIN_FILE=path/to/file
+```
+
+The exact toolchain file to use depends on the prefix used by the MinGW or
+MinGW-w64 binaries on your system.  You can usually see this in the /usr
+directory.  For example, both the Ubuntu and Cygwin MinGW-w64 packages have
+`/usr/x86_64-w64-mingw32` for the 64-bit compilers, so the correct invocation
+would be:
+
+```sh
+cmake -S path/to/glfw -B path/to/build -D CMAKE_TOOLCHAIN_FILE=CMake/x86_64-w64-mingw32.cmake
+```
+
+The path to the toolchain file is relative to the path to the GLFW source tree
+passed to the `-S` flag, not to the current directory.
+
+For more details see the [CMake toolchain guide][cmake-toolchains].
+
+[cmake-toolchains]: https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html
+
+
+## Compiling GLFW manually {#compile_manual}
+
+If you wish to compile GLFW without its CMake build environment then you will have to do
+at least some platform-detection yourself.  There are preprocessor macros for
+enabling support for the platforms (window systems) available.  There are also optional,
+platform-specific macros for various features.
+
+When building, GLFW will expect the necessary configuration macros to be defined
+on the command-line.  The GLFW CMake files set these as private compile
+definitions on the GLFW target but if you compile the GLFW sources manually you
+will need to define them yourself.
+
+The window system is used to create windows, handle input, monitors, gamma ramps and
+clipboard.  The options are:
+
+ - @b _GLFW_COCOA to use the Cocoa frameworks
+ - @b _GLFW_WIN32 to use the Win32 API
+ - @b _GLFW_WAYLAND to use the Wayland protocol
+ - @b _GLFW_X11 to use the X Window System
+
+The @b _GLFW_WAYLAND and @b _GLFW_X11 macros may be combined and produces a library that
+attempts to detect the appropriate platform at initialization.
+
+If you are building GLFW as a shared library / dynamic library / DLL then you
+must also define @b _GLFW_BUILD_DLL.  Otherwise, you must not define it.
+
+If you are using a custom name for the Vulkan, EGL, GLX, OSMesa, OpenGL, GLESv1
+or GLESv2 library, you can override the default names by defining those you need
+of @b _GLFW_VULKAN_LIBRARY, @b _GLFW_EGL_LIBRARY, @b _GLFW_GLX_LIBRARY, @b
+_GLFW_OSMESA_LIBRARY, @b _GLFW_OPENGL_LIBRARY, @b _GLFW_GLESV1_LIBRARY and @b
+_GLFW_GLESV2_LIBRARY.  Otherwise, GLFW will use the built-in default names.
+
+@note None of the @ref build_macros may be defined during the compilation of
+GLFW.  If you define any of these in your build files, make sure they are not
+applied to the GLFW sources.
+