Lua

LuaJIT is only distributed as a source package. This page explains how to build and install LuaJIT with different operating systems and C compilers.

For the impatient (on POSIX systems):

make && sudo make install

LuaJIT currently builds out-of-the box on most systems. Here's the compatibility matrix for the supported combinations of operating systems, CPUs and compilers:

CPU / OS Linux or
Android
*BSD, Other OSX 10.4+ or
iOS 3.0+
Windows
XP/Vista/7
x86 (32 bit) GCC 4.x
GCC 3.4
GCC 4.x
GCC 3.4
GCC 4.x
GCC 3.4
MSVC, MSVC/EE
WinSDK
MinGW, Cygwin
x64 (64 bit) GCC 4.x ORBIS (PS4) GCC 4.x MSVC + SDK v7.0
WinSDK v7.0
ARMv5+
ARM9E+
GCC 4.2+ GCC 4.2+ GCC 4.2+  
PPC GCC 4.3+ GCC 4.3+
GCC 4.1 (PS3)
  XEDK (Xbox 360)
PPC/e500v2 GCC 4.3+ GCC 4.3+    
MIPS GCC 4.3+ GCC 4.3+    

Configuring LuaJIT

The standard configuration should work fine for most installations. Usually there is no need to tweak the settings. The following files hold all user-configurable settings:

Please read the instructions given in these files, before changing any settings.

POSIX Systems (Linux, OSX, *BSD etc.)

Prerequisites

Depending on your distribution, you may need to install a package for GCC, the development headers and/or a complete SDK. E.g. on a current Debian/Ubuntu, install libc6-dev with the package manager.

Download the current source package of LuaJIT (pick the .tar.gz), if you haven't already done so. Move it to a directory of your choice, open a terminal window and change to this directory. Now unpack the archive and change to the newly created directory:

tar zxf LuaJIT-2.0.3.tar.gz
cd LuaJIT-2.0.3

Building LuaJIT

The supplied Makefiles try to auto-detect the settings needed for your operating system and your compiler. They need to be run with GNU Make, which is probably the default on your system, anyway. Simply run:

make

This always builds a native x86, x64 or PPC binary, depending on the host OS you're running this command on. Check the section on cross-compilation for more options.

By default, modules are only searched under the prefix /usr/local. You can add an extra prefix to the search paths by appending the PREFIX option, e.g.:

make PREFIX=/home/myself/lj2

Note for OSX: if the MACOSX_DEPLOYMENT_TARGET environment variable is not set, then it's forced to 10.4.

Installing LuaJIT

The top-level Makefile installs LuaJIT by default under /usr/local, i.e. the executable ends up in /usr/local/bin and so on. You need root privileges to write to this path. So, assuming sudo is installed on your system, run the following command and enter your sudo password:

sudo make install

Otherwise specify the directory prefix as an absolute path, e.g.:

make install PREFIX=/home/myself/lj2

Obviously the prefixes given during build and installation need to be the same.

Windows Systems

Prerequisites

Either install one of the open source SDKs (MinGW or Cygwin), which come with a modified GCC plus the required development headers.

Or install Microsoft's Visual C++ (MSVC). The freely downloadable Express Edition works just fine, but only contains an x86 compiler.

The freely downloadable Windows SDK only comes with command line tools, but this is all you need to build LuaJIT. It contains x86 and x64 compilers.

Next, download the source package and unpack it using an archive manager (e.g. the Windows Explorer) to a directory of your choice.

Building with MSVC

Open a "Visual Studio .NET Command Prompt", cd to the directory where you've unpacked the sources and run these commands:

cd src
msvcbuild

Then follow the installation instructions below.

Building with the Windows SDK

Open a "Windows SDK Command Shell" and select the x86 compiler:

setenv /release /x86

Or select the x64 compiler:

setenv /release /x64

Then cd to the directory where you've unpacked the sources and run these commands:

cd src
msvcbuild

Then follow the installation instructions below.

Building with MinGW or Cygwin

Open a command prompt window and make sure the MinGW or Cygwin programs are in your path. Then cd to the directory where you've unpacked the sources and run this command for MinGW:

mingw32-make

Or this command for Cygwin:

make

Then follow the installation instructions below.

Installing LuaJIT

Copy luajit.exe and lua51.dll (built in the src directory) to a newly created directory (any location is ok). Add lua and lua\jit directories below it and copy all Lua files from the src\jit directory of the distribution to the latter directory.

There are no hardcoded absolute path names — all modules are loaded relative to the directory where luajit.exe is installed (see src/luaconf.h).

Cross-compiling LuaJIT

The GNU Makefile-based build system allows cross-compiling on any host for any supported target, as long as both architectures have the same pointer size. If you want to cross-compile to any 32 bit target on an x64 OS, you need to install the multilib development package (e.g. libc6-dev-i386 on Debian/Ubuntu) and build a 32 bit host part (HOST_CC="gcc -m32").

You need to specify TARGET_SYS whenever the host OS and the target OS differ, or you'll get assembler or linker errors. E.g. if you're compiling on a Windows or OSX host for embedded Linux or Android, you need to add TARGET_SYS=Linux to the examples below. For a minimal target OS, you may need to disable the built-in allocator in src/Makefile and use TARGET_SYS=Other. The examples below only show some popular targets — please check the comments in src/Makefile for more details.

# Cross-compile to a 32 bit binary on a multilib x64 OS
make CC="gcc -m32"

# Cross-compile on Debian/Ubuntu for Windows (mingw32 package)
make HOST_CC="gcc -m32" CROSS=i586-mingw32msvc- TARGET_SYS=Windows

The CROSS prefix allows specifying a standard GNU cross-compile toolchain (Binutils, GCC and a matching libc). The prefix may vary depending on the --target the toolchain was built for (note the CROSS prefix has a trailing "-"). The examples below use the canonical toolchain triplets for Linux.

Since there's often no easy way to detect CPU features at runtime, it's important to compile with the proper CPU or architecture settings. You can specify these when building the toolchain yourself. Or add -mcpu=... or -march=... to TARGET_CFLAGS. For ARM it's important to have the correct -mfloat-abi=... setting, too. Otherwise LuaJIT may not run at the full performance of your target CPU.

# ARM soft-float
make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabi- \
     TARGET_CFLAGS="-mfloat-abi=soft"

# ARM soft-float ABI with VFP (example for Cortex-A8)
make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabi- \
     TARGET_CFLAGS="-mcpu=cortex-a8 -mfloat-abi=softfp"

# ARM hard-float ABI with VFP (armhf, requires recent toolchain)
make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabihf-

# PPC
make HOST_CC="gcc -m32" CROSS=powerpc-linux-gnu-
# PPC/e500v2 (fast interpreter only)
make HOST_CC="gcc -m32" CROSS=powerpc-e500v2-linux-gnuspe-

# MIPS big-endian
make HOST_CC="gcc -m32" CROSS=mips-linux-
# MIPS little-endian
make HOST_CC="gcc -m32" CROSS=mipsel-linux-

You can cross-compile for Android using the Android NDK. The environment variables need to match the install locations and the desired target platform. E.g. Android 4.0 corresponds to ABI level 14. For details check the folder docs in the NDK directory.

Only a few common variations for the different CPUs, ABIs and platforms are listed. Please use your own judgement for which combination you want to build/deploy or which lowest common denominator you want to pick:

# Android/ARM, armeabi (ARMv5TE soft-float), Android 2.2+ (Froyo)
NDK=/opt/android/ndk
NDKABI=8
NDKVER=$NDK/toolchains/arm-linux-androideabi-4.6
NDKP=$NDKVER/prebuilt/linux-x86/bin/arm-linux-androideabi-
NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-arm"
make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF"

# Android/ARM, armeabi-v7a (ARMv7 VFP), Android 4.0+ (ICS)
NDK=/opt/android/ndk
NDKABI=14
NDKVER=$NDK/toolchains/arm-linux-androideabi-4.6
NDKP=$NDKVER/prebuilt/linux-x86/bin/arm-linux-androideabi-
NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-arm"
NDKARCH="-march=armv7-a -mfloat-abi=softfp -Wl,--fix-cortex-a8"
make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF $NDKARCH"

# Android/MIPS, mips (MIPS32R1 hard-float), Android 4.0+ (ICS)
NDK=/opt/android/ndk
NDKABI=14
NDKVER=$NDK/toolchains/mipsel-linux-android-4.6
NDKP=$NDKVER/prebuilt/linux-x86/bin/mipsel-linux-android-
NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-mips"
make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF"

# Android/x86, x86 (i686 SSE3), Android 4.0+ (ICS)
NDK=/opt/android/ndk
NDKABI=14
NDKVER=$NDK/toolchains/x86-4.6
NDKP=$NDKVER/prebuilt/linux-x86/bin/i686-linux-android-
NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-x86"
make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF"

You can cross-compile for iOS 3.0+ (iPhone/iPad) using the iOS SDK. The environment variables need to match the iOS SDK version:

Note: the JIT compiler is disabled for iOS, because regular iOS Apps are not allowed to generate code at runtime. You'll only get the performance of the LuaJIT interpreter on iOS. This is still faster than plain Lua, but much slower than the JIT compiler. Please complain to Apple, not me. Or use Android. :-p

IXCODE=`xcode-select -print-path`
ISDK=$IXCODE/Platforms/iPhoneOS.platform/Developer
ISDKVER=iPhoneOS6.0.sdk
ISDKP=$ISDK/usr/bin/
ISDKF="-arch armv7 -isysroot $ISDK/SDKs/$ISDKVER"
make HOST_CC="gcc -m32 -arch i386" CROSS=$ISDKP TARGET_FLAGS="$ISDKF" \
     TARGET_SYS=iOS

You can cross-compile for PS3 using the PS3 SDK from a Linux host or a Windows host (requires 32 bit MinGW (GCC) on the host, too). Due to restrictions on consoles, the JIT compiler is disabled and only the fast interpreter is built:

make HOST_CC="gcc -m32" CROSS=ppu-lv2-

You can cross-compile for PS4 from a Windows host using the PS4 SDK (ORBIS) plus 64 bit MSVC. Due to restrictions on consoles, the JIT compiler is disabled and only the fast interpreter is built.

Open a "Visual Studio .NET Command Prompt" (64 bit host compiler), cd to the directory where you've unpacked the sources and run the following commands. This builds a static library libluajit.a, which can be linked against your game, just like the Lua library.

cd src
ps4build

You can cross-compile for Xbox 360 using the Xbox 360 SDK (MSVC + XEDK). Due to restrictions on consoles, the JIT compiler is disabled and only the fast interpreter is built.

Open a "Visual Studio .NET Command Prompt" (32 bit host compiler), cd to the directory where you've unpacked the sources and run the following commands. This builds a static library luajit20.lib, which can be linked against your game, just like the Lua library.

cd src
xedkbuild

Embedding LuaJIT

LuaJIT is API-compatible with Lua 5.1. If you've already embedded Lua into your application, you probably don't need to do anything to switch to LuaJIT, except link with a different library:

Additional hints for initializing LuaJIT using the C API functions:

Hints for Distribution Maintainers

The LuaJIT build system has extra provisions for the needs of most POSIX-based distributions. If you're a package maintainer for a distribution, please make use of these features and avoid patching, subverting, autotoolizing or messing up the build system in unspeakable ways.

There should be absolutely no need to patch luaconf.h or any of the Makefiles. And please do not hand-pick files for your packages — simply use whatever make install creates. There's a reason for all of the files and directories it creates.

The build system uses GNU make and auto-detects most settings based on the host you're building it on. This should work fine for native builds, even when sandboxed. You may need to pass some of the following flags to both the make and the make install command lines for a regular distribution build:

The build system has a special target for an amalgamated build, i.e. make amalg. This compiles the LuaJIT core as one huge C file and allows GCC to generate faster and shorter code. Alas, this requires lots of memory during the build. This may be a problem for some users, that's why it's not enabled by default. But it shouldn't be a problem for most build farms. It's recommended that binary distributions use this target for their LuaJIT builds.

The tl;dr version of the above:

make amalg PREFIX=/usr && \
make install PREFIX=/usr DESTDIR=/tmp/buildroot

Finally, if you encounter any difficulties, please contact me first, instead of releasing a broken package onto unsuspecting users. Because they'll usually gonna complain to me (the upstream) and not you (the package maintainer), anyway.