docs/compile.dox - third_party/glfw - Git at Google

 /*!

 @page compile Compiling GLFW

 @tableofcontents

 This is about compiling the GLFW library itself.  For information on how to
 build applications that use GLFW, see the @ref build guide.


 @section compile_cmake Using CMake

 GLFW uses [CMake](http://www.cmake.org/) to generate project files or makefiles
 for a particular development environment.  If you are on a Unix-like system such
 as Linux or FreeBSD or have a package system like Fink, MacPorts, Cygwin or
 Homebrew, you can simply install its CMake package.  If not, you can download
 installers for Windows and OS X from the [CMake website](http://www.cmake.org/).

 @note CMake only generates project files or makefiles.  It does not compile the
 actual GLFW library.  To compile GLFW, first generate these files and then use
 them in your chosen development environment to compile the actual GLFW library.


 @subsection compile_deps Dependencies

 Once you have installed CMake, make sure that all other dependencies are
 available.  On some platforms, GLFW needs a few additional packages to be
 installed.  See the section for your chosen platform and development environment
 below.


 @subsubsection compile_deps_msvc Dependencies for Visual C++ on Windows

 The Microsoft Platform SDK that is installed along with Visual C++ already
 contains all the necessary headers, link libraries and tools except for CMake.
 Move on to @ref compile_generate.


 @subsubsection compile_deps_mingw Dependencies for MinGW or MinGW-w64 on Windows

 Both the MinGW and the MinGW-w64 packages already contain all the necessary
 headers, link libraries and tools except for CMake.  Move on to @ref
 compile_generate.


 @subsubsection compile_deps_mingw_cross Dependencies for MinGW or MinGW-w64 cross-compilation

 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/` directory that allow for easy
 cross-compilation of Windows binaries.  To use these files you need to add a
 special parameter when generating the project files or makefiles:

 @code{.sh}
 cmake -DCMAKE_TOOLCHAIN_FILE=<toolchain-file> .
 @endcode

 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 Debian/Ubuntu and Cygwin MinGW-w64 packages
 have `/usr/x86_64-w64-mingw32` for the 64-bit compilers, so the correct
 invocation would be:

 @code{.sh}
 cmake -DCMAKE_TOOLCHAIN_FILE=CMake/x86_64-w64-mingw32.cmake .
 @endcode

 For more details see the article
 [CMake Cross Compiling](http://www.paraview.org/Wiki/CMake_Cross_Compiling) on
 the CMake wiki.

 Once you have this set up, move on to @ref compile_generate.


 @subsubsection compile_deps_xcode Dependencies for Xcode on OS X

 Xcode comes with all necessary tools except for CMake.  The required headers
 and libraries are included in the core OS X frameworks.  Xcode can be downloaded
 from the Mac App Store or from the ADC Member Center.

 Once you have Xcode installed, move on to @ref compile_generate.


 @subsubsection compile_deps_x11 Dependencies for Linux and X11

 To compile GLFW for X11, you need to have the X11 and OpenGL header packages
 installed, as well as the basic development tools like GCC and make.  For
 example, on Ubuntu and other distributions based on Debian GNU/Linux, you need
 to install the `xorg-dev` and `libglu1-mesa-dev` packages.  The former pulls in
 all X.org header packages and the latter pulls in the Mesa OpenGL and GLU
 packages.  GLFW itself doesn't need or use GLU, but some of the examples do.
 Note that using header files and libraries from Mesa during compilation
 _will not_ tie your binaries to the Mesa implementation of OpenGL.

 Once you have installed the necessary packages, move on to @ref
 compile_generate.


 @subsection compile_generate Generating build files with CMake

 Once you have all necessary dependencies it is time to generate the project
 files or makefiles for your development environment.  CMake needs to know two
 paths for this: the path to the _root_ directory of the GLFW source tree (i.e.
 _not_ the `src` subdirectory) and the target path for the generated files and
 compiled binaries.  If these are the same, it is called an in-tree build,
 otherwise it is called an out-of-tree build.

 One of several advantages of out-of-tree builds is that you can generate files
 and compile for different development environments using a single source tree.

 @note This section is about generating the project files or makefiles necessary
 to compile the GLFW library, not about compiling the actual library.


 @subsubsection compile_generate_cli Generating files with the CMake command-line tool

 To make an in-tree build, enter the _root_ directory of the GLFW source tree
 (i.e. _not_ the `src` subdirectory) and run CMake.  The current directory is
 used as target path, while the path provided as an argument is used to find the
 source tree.

 @code{.sh}
 cd <glfw-root-dir>
 cmake .
 @endcode

 To make an out-of-tree build, make another directory, enter it and run CMake
 with the (relative or absolute) path to the root of the source tree as an
 argument.

 @code{.sh}
 cd <glfw-root-dir>
 mkdir build
 cd build
 cmake ..
 @endcode

 Once you have generated the project files or makefiles for your chosen
 development environment, move on to @ref compile_compile.


 @subsubsection compile_generate_gui Generating files with the CMake GUI

 If you are using the GUI version, choose the root of the GLFW source tree as
 source location and the same directory or another, empty directory as the
 destination for binaries.  Choose _Configure_, change any options you wish to,
 _Configure_ again to let the changes take effect and then _Generate_.

 Once you have generated the project files or makefiles for your chosen
 development environment, move on to @ref compile_compile.


 @subsection compile_compile Compiling the library

 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.

 Once the GLFW library is compiled, you are ready to build your applications,
 linking it to the GLFW library.  See the @ref build guide for more information.


 @subsection compile_options CMake 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, use the `ccmake` tool.
 Some package systems like Ubuntu and other distributions based on Debian
 GNU/Linux have this tool in a separate `cmake-curses-gui` package.


 @subsubsection compile_options_shared Shared CMake options

 `BUILD_SHARED_LIBS` determines whether GLFW is built as a static
 library or as a DLL / shared library / dynamic library.

 `LIB_SUFFIX` affects where the GLFW shared /dynamic library is installed.  If it
 is empty, it is installed to `${CMAKE_INSTALL_PREFIX}/lib`.  If it is set to
 `64`, it is installed to `${CMAKE_INSTALL_PREFIX}/lib64`.

 `GLFW_CLIENT_LIBRARY` determines which client API library to use.  If set to
 `opengl` the OpenGL library is used, if set to `glesv1` for the OpenGL ES 1.x
 library is used, or if set to `glesv2` the OpenGL ES 2.0 library is used.  The
 selected library and its header files must be present on the system for this to
 work.

 `GLFW_BUILD_EXAMPLES` determines whether the GLFW examples are built
 along with the library.

 `GLFW_BUILD_TESTS` determines whether the GLFW test programs are
 built along with the library.

 `GLFW_BUILD_DOCS` determines whether the GLFW documentation is built along with
 the library.


 @subsubsection compile_options_osx OS X specific CMake options

 `GLFW_USE_CHDIR` determines whether `glfwInit` changes the current
 directory of bundled applications to the `Contents/Resources` directory.

 `GLFW_USE_MENUBAR` determines whether the first call to
 `glfwCreateWindow` sets up a minimal menu bar.

 `GLFW_USE_RETINA` determines whether windows will use the full resolution of
 Retina displays.

 `GLFW_BUILD_UNIVERSAL` determines whether to build Universal Binaries.


 @subsubsection compile_options_win32 Windows specific CMake options

 `USE_MSVC_RUNTIME_LIBRARY_DLL` determines whether to use the DLL version or the
 static library version of the Visual C++ runtime library.  If set to `ON`, the
 DLL version of the Visual C++ library is used.  It is recommended to set this to
 `ON`, as this keeps the executable smaller and benefits from security and bug
 fix updates of the Visual C++ runtime.

 `GLFW_USE_DWM_SWAP_INTERVAL` determines whether the swap interval is set even
 when DWM compositing is enabled.  If this is `ON`, the swap interval is set even
 if DWM is enabled.  It is recommended to set this to `OFF`, as doing otherwise
 can lead to severe jitter.

 `GLFW_USE_OPTIMUS_HPG` determines whether to export the `NvOptimusEnablement`
 symbol, which forces the use of the high-performance GPU on Nvidia Optimus
 systems.  This symbol needs 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.  See _Enabling
 High Performance Graphics Rendering on Optimus Systems_ for more details.


 @subsubsection compile_options_egl EGL specific CMake options

 `GLFW_USE_EGL` determines whether to use EGL instead of the platform-specific
 context creation API.  Note that EGL is not yet provided on all supported
 platforms.


 @section compile_manual Compiling GLFW manually

 If you wish to compile GLFW without its CMake build environment then you will
 have to do at least some of the platform detection yourself.  GLFW needs
 a number of configuration macros to be defined in order to know what it's being
 compiled for and has many optional, platform-specific ones for various features.

 When building with CMake, the `glfw_config.h` configuration header is generated
 based on the current platform and CMake options.  The GLFW CMake environment
 defines `_GLFW_USE_CONFIG_H`, which causes this header to be included by
 `internal.h`.  Without this macro, GLFW will expect the necessary configuration
 macros to be defined on the command-line.

 Three macros _must_ be defined when compiling GLFW: one selecting the window
 creation API, one selecting the context creation API and one client library.
 Exactly one of each kind must be defined for GLFW to compile and link.

 The window creation API is used to create windows, handle input, monitors, gamma
 ramps and clipboard.  The options are:

  - `_GLFW_COCOA` to use the Cocoa frameworks
  - `_GLFW_WIN32` to use the Win32 API
  - `_GLFW_X11` to use the X Window System
  - `_GLFW_WAYLAND` to use the Wayland API (experimental and incomplete)
  - `_GLFW_MIR` to use the Mir API (experimental and incomplete)

 The context creation API is used to enumerate pixel formats / framebuffer
 configurations and to create contexts.  The options are:

  - `_GLFW_NSGL` to use the Cocoa OpenGL framework
  - `_GLFW_WGL` to use the Win32 WGL API
  - `_GLFW_GLX` to use the X11 GLX API
  - `_GLFW_EGL` to use the EGL API

 Wayland and Mir both require the EGL backend.

 The client library is the one providing the OpenGL or OpenGL ES API, which is
 used by GLFW to probe the created context.  This is not the same thing as the
 client API, as many desktop OpenGL client libraries now expose the OpenGL ES API
 through extensions.  The options are:

  - `_GLFW_USE_OPENGL` for the desktop OpenGL (opengl32.dll, libGL.so or
    OpenGL.framework)
  - `_GLFW_USE_GLESV1` for OpenGL ES 1.x (experimental)
  - `_GLFW_USE_GLESV2` for OpenGL ES 2.x (experimental)

 Note that `_GLFW_USE_GLESV1` and `_GLFW_USE_GLESV2` may only be used with EGL,
 as the other context creation APIs do not interface with OpenGL ES client
 libraries.

 If you are building GLFW as a shared library / dynamic library / DLL then you
 must also define `_GLFW_BUILD_DLL`.  Otherwise, you may not define it.

 If you are using the X11 window creation API then you _must_ also select an entry
 point retrieval mechanism.

  - `_GLFW_HAS_GLXGETPROCADDRESS` to use `glXGetProcAddress` (recommended)
  - `_GLFW_HAS_GLXGETPROCADDRESSARB` to use `glXGetProcAddressARB` (legacy)
  - `_GLFW_HAS_GLXGETPROCADDRESSEXT` to use `glXGetProcAddressEXT` (legacy)
  - `_GLFW_HAS_DLOPEN` to do manual retrieval with `dlopen` (fallback)

 In addition, support for the following X11 extensions can be enabled:

  - `_GLFW_HAS_XINPUT` to use XInput2 for high-resolution cursor motion
  (recommended)

 If you are using the Cocoa window creation API, the following options are
 available:

  - `_GLFW_USE_CHDIR` to `chdir` to the `Resources` subdirectory of the
    application bundle during @ref glfwInit (recommended)
  - `_GLFW_USE_MENUBAR` to create and populate the menu bar when the first window
    is created (recommended)
  - `_GLFW_USE_RETINA` to have windows use the full resolution of Retina displays
    (recommended)

 @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.

 */
	/*!

	@page compile Compiling GLFW

	@tableofcontents

	This is about compiling the GLFW library itself. For information on how to
	build applications that use GLFW, see the @ref build guide.


	@section compile_cmake Using CMake

	GLFW uses [CMake](http://www.cmake.org/) to generate project files or makefiles
	for a particular development environment. If you are on a Unix-like system such
	as Linux or FreeBSD or have a package system like Fink, MacPorts, Cygwin or
	Homebrew, you can simply install its CMake package. If not, you can download
	installers for Windows and OS X from the [CMake website](http://www.cmake.org/).

	@note CMake only generates project files or makefiles. It does not compile the
	actual GLFW library. To compile GLFW, first generate these files and then use
	them in your chosen development environment to compile the actual GLFW library.


	@subsection compile_deps Dependencies

	Once you have installed CMake, make sure that all other dependencies are
	available. On some platforms, GLFW needs a few additional packages to be
	installed. See the section for your chosen platform and development environment
	below.


	@subsubsection compile_deps_msvc Dependencies for Visual C++ on Windows

	The Microsoft Platform SDK that is installed along with Visual C++ already
	contains all the necessary headers, link libraries and tools except for CMake.
	Move on to @ref compile_generate.


	@subsubsection compile_deps_mingw Dependencies for MinGW or MinGW-w64 on Windows

	Both the MinGW and the MinGW-w64 packages already contain all the necessary
	headers, link libraries and tools except for CMake. Move on to @ref
	compile_generate.


	@subsubsection compile_deps_mingw_cross Dependencies for MinGW or MinGW-w64 cross-compilation

	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/` directory that allow for easy
	cross-compilation of Windows binaries. To use these files you need to add a
	special parameter when generating the project files or makefiles:

	@code{.sh}
	cmake -DCMAKE_TOOLCHAIN_FILE=<toolchain-file> .
	@endcode

	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 Debian/Ubuntu and Cygwin MinGW-w64 packages
	have `/usr/x86_64-w64-mingw32` for the 64-bit compilers, so the correct
	invocation would be:

	@code{.sh}
	cmake -DCMAKE_TOOLCHAIN_FILE=CMake/x86_64-w64-mingw32.cmake .
	@endcode

	For more details see the article
	[CMake Cross Compiling](http://www.paraview.org/Wiki/CMake_Cross_Compiling) on
	the CMake wiki.

	Once you have this set up, move on to @ref compile_generate.


	@subsubsection compile_deps_xcode Dependencies for Xcode on OS X

	Xcode comes with all necessary tools except for CMake. The required headers
	and libraries are included in the core OS X frameworks. Xcode can be downloaded
	from the Mac App Store or from the ADC Member Center.

	Once you have Xcode installed, move on to @ref compile_generate.


	@subsubsection compile_deps_x11 Dependencies for Linux and X11

	To compile GLFW for X11, you need to have the X11 and OpenGL header packages
	installed, as well as the basic development tools like GCC and make. For
	example, on Ubuntu and other distributions based on Debian GNU/Linux, you need
	to install the `xorg-dev` and `libglu1-mesa-dev` packages. The former pulls in
	all X.org header packages and the latter pulls in the Mesa OpenGL and GLU
	packages. GLFW itself doesn't need or use GLU, but some of the examples do.
	Note that using header files and libraries from Mesa during compilation
	_will not_ tie your binaries to the Mesa implementation of OpenGL.

	Once you have installed the necessary packages, move on to @ref
	compile_generate.


	@subsection compile_generate Generating build files with CMake

	Once you have all necessary dependencies it is time to generate the project
	files or makefiles for your development environment. CMake needs to know two
	paths for this: the path to the _root_ directory of the GLFW source tree (i.e.
	_not_ the `src` subdirectory) and the target path for the generated files and
	compiled binaries. If these are the same, it is called an in-tree build,
	otherwise it is called an out-of-tree build.

	One of several advantages of out-of-tree builds is that you can generate files
	and compile for different development environments using a single source tree.

	@note This section is about generating the project files or makefiles necessary
	to compile the GLFW library, not about compiling the actual library.


	@subsubsection compile_generate_cli Generating files with the CMake command-line tool

	To make an in-tree build, enter the _root_ directory of the GLFW source tree
	(i.e. _not_ the `src` subdirectory) and run CMake. The current directory is
	used as target path, while the path provided as an argument is used to find the
	source tree.

	@code{.sh}
	cd <glfw-root-dir>
	cmake .
	@endcode

	To make an out-of-tree build, make another directory, enter it and run CMake
	with the (relative or absolute) path to the root of the source tree as an
	argument.

	@code{.sh}
	cd <glfw-root-dir>
	mkdir build
	cd build
	cmake ..
	@endcode

	Once you have generated the project files or makefiles for your chosen
	development environment, move on to @ref compile_compile.


	@subsubsection compile_generate_gui Generating files with the CMake GUI

	If you are using the GUI version, choose the root of the GLFW source tree as
	source location and the same directory or another, empty directory as the
	destination for binaries. Choose _Configure_, change any options you wish to,
	_Configure_ again to let the changes take effect and then _Generate_.

	Once you have generated the project files or makefiles for your chosen
	development environment, move on to @ref compile_compile.


	@subsection compile_compile Compiling the library

	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.

	Once the GLFW library is compiled, you are ready to build your applications,
	linking it to the GLFW library. See the @ref build guide for more information.


	@subsection compile_options CMake 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, use the `ccmake` tool.
	Some package systems like Ubuntu and other distributions based on Debian
	GNU/Linux have this tool in a separate `cmake-curses-gui` package.


	@subsubsection compile_options_shared Shared CMake options

	`BUILD_SHARED_LIBS` determines whether GLFW is built as a static
	library or as a DLL / shared library / dynamic library.

	`LIB_SUFFIX` affects where the GLFW shared /dynamic library is installed. If it
	is empty, it is installed to `${CMAKE_INSTALL_PREFIX}/lib`. If it is set to
	`64`, it is installed to `${CMAKE_INSTALL_PREFIX}/lib64`.

	`GLFW_CLIENT_LIBRARY` determines which client API library to use. If set to
	`opengl` the OpenGL library is used, if set to `glesv1` for the OpenGL ES 1.x
	library is used, or if set to `glesv2` the OpenGL ES 2.0 library is used. The
	selected library and its header files must be present on the system for this to
	work.

	`GLFW_BUILD_EXAMPLES` determines whether the GLFW examples are built
	along with the library.

	`GLFW_BUILD_TESTS` determines whether the GLFW test programs are
	built along with the library.

	`GLFW_BUILD_DOCS` determines whether the GLFW documentation is built along with
	the library.


	@subsubsection compile_options_osx OS X specific CMake options

	`GLFW_USE_CHDIR` determines whether `glfwInit` changes the current
	directory of bundled applications to the `Contents/Resources` directory.

	`GLFW_USE_MENUBAR` determines whether the first call to
	`glfwCreateWindow` sets up a minimal menu bar.

	`GLFW_USE_RETINA` determines whether windows will use the full resolution of
	Retina displays.

	`GLFW_BUILD_UNIVERSAL` determines whether to build Universal Binaries.


	@subsubsection compile_options_win32 Windows specific CMake options

	`USE_MSVC_RUNTIME_LIBRARY_DLL` determines whether to use the DLL version or the
	static library version of the Visual C++ runtime library. If set to `ON`, the
	DLL version of the Visual C++ library is used. It is recommended to set this to
	`ON`, as this keeps the executable smaller and benefits from security and bug
	fix updates of the Visual C++ runtime.

	`GLFW_USE_DWM_SWAP_INTERVAL` determines whether the swap interval is set even
	when DWM compositing is enabled. If this is `ON`, the swap interval is set even
	if DWM is enabled. It is recommended to set this to `OFF`, as doing otherwise
	can lead to severe jitter.

	`GLFW_USE_OPTIMUS_HPG` determines whether to export the `NvOptimusEnablement`
	symbol, which forces the use of the high-performance GPU on Nvidia Optimus
	systems. This symbol needs 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. See _Enabling
	High Performance Graphics Rendering on Optimus Systems_ for more details.


	@subsubsection compile_options_egl EGL specific CMake options

	`GLFW_USE_EGL` determines whether to use EGL instead of the platform-specific
	context creation API. Note that EGL is not yet provided on all supported
	platforms.


	@section compile_manual Compiling GLFW manually

	If you wish to compile GLFW without its CMake build environment then you will
	have to do at least some of the platform detection yourself. GLFW needs
	a number of configuration macros to be defined in order to know what it's being
	compiled for and has many optional, platform-specific ones for various features.

	When building with CMake, the `glfw_config.h` configuration header is generated
	based on the current platform and CMake options. The GLFW CMake environment
	defines `_GLFW_USE_CONFIG_H`, which causes this header to be included by
	`internal.h`. Without this macro, GLFW will expect the necessary configuration
	macros to be defined on the command-line.

	Three macros _must_ be defined when compiling GLFW: one selecting the window
	creation API, one selecting the context creation API and one client library.
	Exactly one of each kind must be defined for GLFW to compile and link.

	The window creation API is used to create windows, handle input, monitors, gamma
	ramps and clipboard. The options are:

	- `_GLFW_COCOA` to use the Cocoa frameworks
	- `_GLFW_WIN32` to use the Win32 API
	- `_GLFW_X11` to use the X Window System
	- `_GLFW_WAYLAND` to use the Wayland API (experimental and incomplete)
	- `_GLFW_MIR` to use the Mir API (experimental and incomplete)

	The context creation API is used to enumerate pixel formats / framebuffer
	configurations and to create contexts. The options are:

	- `_GLFW_NSGL` to use the Cocoa OpenGL framework
	- `_GLFW_WGL` to use the Win32 WGL API
	- `_GLFW_GLX` to use the X11 GLX API
	- `_GLFW_EGL` to use the EGL API

	Wayland and Mir both require the EGL backend.

	The client library is the one providing the OpenGL or OpenGL ES API, which is
	used by GLFW to probe the created context. This is not the same thing as the
	client API, as many desktop OpenGL client libraries now expose the OpenGL ES API
	through extensions. The options are:

	- `_GLFW_USE_OPENGL` for the desktop OpenGL (opengl32.dll, libGL.so or
	OpenGL.framework)
	- `_GLFW_USE_GLESV1` for OpenGL ES 1.x (experimental)
	- `_GLFW_USE_GLESV2` for OpenGL ES 2.x (experimental)

	Note that `_GLFW_USE_GLESV1` and `_GLFW_USE_GLESV2` may only be used with EGL,
	as the other context creation APIs do not interface with OpenGL ES client
	libraries.

	If you are building GLFW as a shared library / dynamic library / DLL then you
	must also define `_GLFW_BUILD_DLL`. Otherwise, you may not define it.

	If you are using the X11 window creation API then you _must_ also select an entry
	point retrieval mechanism.

	- `_GLFW_HAS_GLXGETPROCADDRESS` to use `glXGetProcAddress` (recommended)
	- `_GLFW_HAS_GLXGETPROCADDRESSARB` to use `glXGetProcAddressARB` (legacy)
	- `_GLFW_HAS_GLXGETPROCADDRESSEXT` to use `glXGetProcAddressEXT` (legacy)
	- `_GLFW_HAS_DLOPEN` to do manual retrieval with `dlopen` (fallback)

	In addition, support for the following X11 extensions can be enabled:

	- `_GLFW_HAS_XINPUT` to use XInput2 for high-resolution cursor motion
	(recommended)

	If you are using the Cocoa window creation API, the following options are
	available:

	- `_GLFW_USE_CHDIR` to `chdir` to the `Resources` subdirectory of the
	application bundle during @ref glfwInit (recommended)
	- `_GLFW_USE_MENUBAR` to create and populate the menu bar when the first window
	is created (recommended)
	- `_GLFW_USE_RETINA` to have windows use the full resolution of Retina displays
	(recommended)

	@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.

	*/