Some SteamOS updates.
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(This page is a work in progress.)
- Static linking
- Supported platforms
- Not supported or abandoned
How to install SDL varies depending on your platform.
SDL 1.2 isn't covered here. It can be installed on legacy platforms that SDL2 doesn't support, such as Mac OS 9 or OS/2, but settling for 1.2 would not be a drop-in replacement for 2.0. Most of these installation instructions happen to work with 1.2, however, on the platforms we cover.
SDL 2.0, unlike 1.2, uses the zlib license, which means you can build a static library linked directly to your program, or just compile SDL's C code directly as part of your project. You are completely allowed to do that. However, we encourage you to not do this for various technical and moral reasons, and won't cover the details of how to in this document. You may not statically link SDL 1.2 in most cases due to its LGPL licensing, but you should really stop using SDL 1.2 anyhow.
Several other platforms will be built "the Unix way," so we'll describe this platform first.
SDL supports most popular flavors of Unix: Linux, the various BSDs, Solaris, and other things like them.
First! Do you need to compile SDL yourself? It's possible your distribution's package manager already did it for you!
Debian-based systems (including Ubuntu) can simply do "sudo apt-get install libsdl2-2.0" to get the library installed system-wide, and all sorts of other useful dependencies, too. "sudo apt-get install libsdl2-dev" will install everything necessary to build programs that use SDL. Please see docs/README-linux.md for a more complete discussion of packages involved.
Red Hat-based systems (including Fedora) can simply do "sudo yum install SDL2" to get the library installed system-wide, or "sudo yum install SDL2-devel" to get headers and other build requirements ready for compiling your own SDL programs.
Gentoo users can "sudo emerge libsdl2" to get everything they need.
If you're compiling SDL yourself, here's what we refer to as "the Unix way" of building:
- Get a copy of the source code, either from Mercurial or an official tarball or whatever.
- Make a separate build directory (SDL will refuse to build in the base of the source tree).
- Run the configure script to set things up.
- Run "make" to compile SDL.
- Run "make install" to install your new SDL build on the system.
This looks something like this:
hg clone https://hg.libsdl.org/SDL SDL cd SDL mkdir build cd build ../configure make sudo make install
The last command says "sudo" so we can write it to /usr/local (by default). You can change this to a different location with the --prefix option to the configure script. In fact, there are a LOT of good options you can use with configure! Be sure to check out its --help option for details. SDL tries to do the right thing by default, though, so you can usually get away with no options at all. "make" could be "make -j4" or whatever if you have more than one CPU; SDL can safely be built in parallel across all the CPU cores you have available to you. A good rule of thumb for Linux is the number of cores plus two, so you use all the processing resources possible, and if a process or two is competing for the disk, those two extra jobs might be able to put the otherwise-idle CPU cores to work in the meantime (so on a four-core system? Try "make -j6".)
An (experimental!) alternative to the configure script is the CMake project file. It works on similar principles to the configure script, but you might find that you enjoy it more, if this is the sort of thing you generally enjoy in the first place. Driving that is left as an exercise for the reader.
Once you have the library installed, you can use the sdl2-config program to help you compile your own code:
gcc -o myprogram myprogram.c `sdl2-config --cflags --libs`
SDL on Unix should only link against the C runtime (glibc). Every thing else it needs will be dynamically loaded at runtime: X11, ALSA, d-bus, etc. This means it is possible to build an SDL that has support for all sorts of targets built in, and it will examine the system at runtime to decide what should be used (for example, if Xlib isn't available, it might try to load Wayland support, etc). In that respect, if you plan to ship the SDL binary that you build, it is to your benefit to make sure your system has development headers for as many targets as possible, regardless of what you plan to personally use, so your final library is as robust as possible. See docs/README-linux.md for more details.
SteamOS is literally a Linux system, and uses the same binaries you distribute to generic Linux Steam users, so generally speaking, all the other Linux advice applies.
If you are shipping a Linux game on Steam, or explicitly targeting SteamOS, the system is guaranteed to provide SDL. The Steam Client will set up the dynamic loader path so that a known-good copy of SDL is available to any program that needs it before launching a game. Steam provides both SDL 1.2 and 2.0 in this manner, for both x86 and amd64, in addition to several add-on libraries like SDL_mixer. When shipping a Linux game on Steam, do not ship a build of SDL with your game. Link against SDL as normal, and expect it to be available on the player's system. This allows Valve to make fixes and improvements to their SDL and those fixes to flow on to your game.
We are obsessive about SDL2 having a backwards-compatible ABI. Whether you build your game using the Steam Runtime SDK or just about any old copy of SDL2, it should work with the one that ships with Steam.
In fact, it's not a bad idea to just copy the SDL build out of the Steam Runtime if you plan to ship a Linux game for non-Steam platforms, too, since you know it's definitely built sanely.
SDL currently provides Visual Studio project files for Visual Studio 2008, 2010, 2012, and 2013 in various flavors, and the CMake files can often generate project files for other Windows compilers.
!!! WRITE ME cygwin, mingw64, cmake, buildbot pregenerated builds, etc.
On Windows, SDL does not depend on a C runtime at all, not even for malloc(). This means it's possible to build SDL with almost any Windows compiler and have it work with a program built with any other. Furthermore, it means that SDLmain (the small static .lib file that optionally provides WinMain()) does not force you to deal with Debug vs Release builds in your app, since it doesn't need either a Debug or Release C runtime. One .lib should work everywhere.
Mac OS X
You can build for Mac OS X "the Unix way" with the configure or CMake scripts, and Xcode projects are also provided. You can ship an SDL.framework, or just build the .dylib file and ship it with an appropriate install_name to ship beside your program's binary.
If you are building "the Unix way," we encourage you to use build-scripts/gcc-fat.sh in the SDL source tree for your compiler:
mkdir build ; cd build ; CC=/where/i/cloned/SDL/build-scripts/gcc-fat.sh ../configure ; make
This will accomplish two important things. First, it will build an x86/x86-64 "universal" version of the library. Second, it will make sure the library is compiled and linked with -mmacosx-version-min=10.5, so that the library will work on any Mac OS X version back to 10.5.0, regardless of what version of Xcode you compiled on and what platform SDK. Without this, you are likely to build something that only works on the latest version of Mac OS X!
SDL2 has dropped support for PowerPC Macs and OS X versions older than 10.5 (SDL 1.2 still supports PPC and 10.0, though). That being said, some small changes can make it work, but they make the codebase uglier for small gains, and it's getting hard to find older macs to test on, so we probably will not be restoring official support.
!!! WRITE ME cmake, buildbot pregenerated builds, etc.
Build SDL "the Unix way" with the configure or CMake scripts. SDL2 can be built with either Haiku's gcc4 compiler or their legacy, BeOS-compatible gcc 2.95.
SDL ships with iOS project files (in the Xcode-iOS directory) which will produce a static library. This library should be usable across all supported iOS devices (including iPhones, iPods, and iPads), and the emulator. Just load the Xcode project and click "Build."
If you want to build SDL on your Raspberry Pi directly, just build it "the Unix way," as the RPi is, more or less, a standard Linux system. It can be built with X11 support, and also can do OpenGL ES rendering directly to the screen without an X server, to save resources. In theory, Wayland could also be supported, but at the time of this writing it doesn't configure/compile correctly (send patches!).
Our buildbot tries to build for Raspberry Pi for each commit, and uploads successful builds to a public webserver. If you want to grab these, it can save you time, especially if you're building on the RPi itself. You can grab the prebuilt library here ... the number represents the Buildbot build number; the bigger the number, the newer the build. These are built with a cross-compiler, with some version of Raspbian in mind, but should work with almost any RPi distro and in a cross-compiler environment, too. We don't promise anything about the quality of these builds, though, and welcome feedback to improve them. Unpack the tarball in the root of your filesystem and it'll install headers, libraries, and sdl2-config in /usr/local (or install wherever).
The actual shell script our buildbot uses to run the Raspberry Pi build is build-scripts/raspberrypi-buildbot.sh in the SDL source tree. It expects a cross-compiler in /opt/rpi-tools and a copy of the root filesystem from a RPi in /opt/rpi-sysroot. You can see some current quirks we work around in there (send patches!).
SDL can target Google Chrome's Native Client, aka "NaCL", which is, more or less, native binaries as web apps. We've tested with "PNaCL" specifically, but you can probably make this work with other compilers too.
Please see docs/README-nacl.md for more details, including how to use our build scripts to generate an SDL build.
Our buildbot tries to build for Native Client for each commit, and uploads successful builds to a public webserver. If you want to grab these, it can save you some hassle. You can grab the prebuilt library here ... the number represents the Buildbot build number; the bigger the number, the newer the build. We don't promise anything about the quality of these builds, and welcome feedback to improve them. Unpack the tarball in the root of your filesystem and it'll install headers, libraries, and sdl2-config in /usr/local (or install wherever).
However, this hasn't landed in SDL's repository yet, but will shortly. Stay tuned!
There are Visual Studio project files for Windows Phone and WinRT, versions 8.0 (using Visual Studio 2012) and 8.1 (using Visual Studio 2013). These are in the "VisualC-WinRT" directory.
WinRT isn't hooked up to our buildbot yet (soon!), but the .bat file we intend to use with it is build-scripts/winrtbuild.bat in the SDL source tree. This will use PowerShell to do some magic, which you can see in build-scripts/winrtbuild.ps1. At least in theory, this should Just Work if you have Windows 8.1, Visual C++ 2013, and the Win8/WinPhone/etc SDKs installed. The script will try to build all reasonable variants (ARM, x86, etc).
SDL apps work on the Ouya! Just build like a standard Android application and side-load it on the device to test.
Not supported or abandoned
If your favorite system is listed here, we aren't working on it. If you send reasonable patches, we are happy to take a look, though! SDL 1.2's API and feature set is different than SDL 2 (dramatically different in some cases), but it's possible that 1.2 still supports some of these systems.
Consoles (PlayStation, XBox, Wii, etc)
SDL2 does not currently support these platforms, but we'd really like to! If you work for Sony, Microsoft, or Nintendo, we would like to port SDL2 to these platforms and provide support to registered developers in a separate repository. Please get in touch with us!
This probably works, or could be made to work, using the Haiku target, but there are no plans to do so. SDL 1.2 still supports BeOS.
This worked at some point using a homebrew toolkit, but we removed it due to bitrot. There's some rudimentary support in SDL 1.2.
This worked at some point using a homebrew toolkit, and while it is currently still in the source tree, no one is working on it. 1.2 did not support the PSP either. We will likely remove this from SDL2 sooner than later, unless a maintainer steps up to improve support.
Mac OS 9 ("Mac OS Classic")
Support was removed in SDL 2.0. SDL 1.2 still supports Mac OS Classic.
IBM OS/2 and eComStation
Support was removed in SDL 2.0. SDL 1.2 still supports OS/2.
Support was removed in SDL 2.0 (Windows XP and later are supported). SDL 1.2 still supports Win9x.
Support was removed in SDL 2.0. SDL 1.2 still supports QNX.
AmigaOS and MorphOS
Support was removed in SDL 2.0 (and later versions of 1.2, too). There are forks of SDL 1.2 that support them, though.
Support was removed in SDL 2.0. SDL 1.2 had limited homebrew support for the Dreamcast.
Support was removed in SDL 2.0. SDL 1.2 still supports it.
Support was removed in SDL 2.0. SDL 1.2 still supports it.