Installation

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 4.2+	GCC 4.2+	XCode 5.0+ Clang	MSVC, MSVC/EE WinSDK MinGW, Cygwin
x64 (64 bit)	GCC 4.2+	GCC 4.2+ ORBIS (PS4)	XCode 5.0+ Clang	MSVC + SDK v7.0 WinSDK v7.0 Durango (Xbox One)
ARMv5+ ARM9E+	GCC 4.2+	GCC 4.2+ PSP2 (PS VITA)	XCode 5.0+ Clang
ARM64	GCC 4.8+		XCode 6.0+ Clang 3.5+
PPC	GCC 4.3+	GCC 4.3+ GCC 4.1 (PS3)		XEDK (Xbox 360)
MIPS32 MIPS64	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:

src/luaconf.h sets some configuration variables.
Makefile has settings for installing LuaJIT (POSIX only).
src/Makefile has settings for compiling LuaJIT under POSIX, MinGW or Cygwin.
src/msvcbuild.bat has settings for compiling LuaJIT with MSVC or WinSDK.

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

LuaJIT on x64 currently uses 32 bit GC objects by default. LJ_GC64 mode may be explicitly enabled: add XCFLAGS=-DLUAJIT_ENABLE_GC64 to the make command or run msvcbuild gc64 for MSVC/WinSDK. Please check the note about the bytecode format differences, too.

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-2.0.5.tar.gz
cd LuaJIT-2.0.5

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 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

First, let's clear up some terminology:

Host: This is your development system, usually based on a x64 or x86 CPU.
Target: This is the target system you want LuaJIT to run on, e.g. Android/ARM.
Toolchain: This comprises a C compiler, linker, assembler and a matching C library.
Host (or system) toolchain: This is the toolchain used to build native binaries for your host system.
Cross-compile toolchain: This is the toolchain used to build binaries for the target system. They can only be run on the target system.

The GNU Makefile-based build system allows cross-compiling on any host for any supported target:

Yes, you need a toolchain for both your host and your target!
Both host and target architectures must have the same pointer size.
E.g. if you want to cross-compile to a 32 bit target on a 64 bit host, 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").
64 bit targets always require compilation on a 64 bit host.

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.
Don't forget to specify the same TARGET_SYS for the install step, too.

Here are some examples where host and target have the same CPU:

# 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:

The best way to get consistent results is to specify the correct settings when building the toolchain yourself.
For a pre-built, generic toolchain add -mcpu=... or -march=... and other necessary flags 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.
For MIPS it's important to select a supported ABI (o32 on MIPS32, n64 on MIPS64) and consistently compile your project either with hard-float or soft-float compiler settings.

Here are some examples for targets with a different CPU than the host:

# 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-A9)
make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabi- \
     TARGET_CFLAGS="-mcpu=cortex-a9 -mfloat-abi=softfp"

# ARM hard-float ABI with VFP (armhf, most modern toolchains)
make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabihf-

# ARM64
make CROSS=aarch64-linux-

# PPC
make HOST_CC="gcc -m32" CROSS=powerpc-linux-gnu-

# MIPS32 big-endian
make HOST_CC="gcc -m32" CROSS=mips-linux-
# MIPS32 little-endian
make HOST_CC="gcc -m32" CROSS=mipsel-linux-

# MIPS64 big-endian
make CROSS=mips-linux- TARGET_CFLAGS="-mips64r2 -mabi=64"
# MIPS64 little-endian
make CROSS=mipsel-linux- TARGET_CFLAGS="-mips64r2 -mabi=64"

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=$NDK/toolchains/arm-linux-androideabi-4.9
NDKP=$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=$NDK/toolchains/arm-linux-androideabi-4.9
NDKP=$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, mipsel (MIPS32R1 hard-float), Android 4.0+ (ICS)
NDK=/opt/android/ndk
NDKABI=14
NDKVER=$NDK/toolchains/mipsel-linux-android-4.9
NDKP=$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=$NDK/toolchains/x86-4.9
NDKP=$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:

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

# iOS/ARM (32 bit)
ISDKP=$(xcrun --sdk iphoneos --show-sdk-path)
ICC=$(xcrun --sdk iphoneos --find clang)
ISDKF="-arch armv7 -isysroot $ISDKP"
make DEFAULT_CC=clang HOST_CC="clang -m32 -arch i386" \
     CROSS="$(dirname $ICC)/" TARGET_FLAGS="$ISDKF" TARGET_SYS=iOS

# iOS/ARM64
ISDKP=$(xcrun --sdk iphoneos --show-sdk-path)
ICC=$(xcrun --sdk iphoneos --find clang)
ISDKF="-arch arm64 -isysroot $ISDKP"
make DEFAULT_CC=clang CROSS="$(dirname $ICC)/" \
     TARGET_FLAGS="$ISDKF" TARGET_SYS=iOS

Cross-compiling for consoles

Building LuaJIT for consoles requires both a supported host compiler (x86 or x64) and a cross-compiler (to PPC or ARM) from the official console SDK.

Due to restrictions on consoles, the JIT compiler is disabled and only the fast interpreter is built. This is still faster than plain Lua, but much slower than the JIT compiler. The FFI is disabled, too, since it's not very useful in such an environment.

The following commands build a static library libluajit.a, which can be linked against your game, just like the Lua library.

To cross-compile for PS3 from a Linux host (requires 32 bit GCC, i.e. multilib Linux/x64) or a Windows host (requires 32 bit MinGW), run this command:

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

To cross-compile for PS4 from a Windows host, 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:

cd src
ps4build

To cross-compile for PS Vita from a Windows host, 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:

cd src
psvitabuild

To cross-compile for Xbox 360 from a Windows host, 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:

cd src
xedkbuild

To cross-compile for Xbox One from a Windows host, 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:

cd src
xb1build

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:

It's strongly suggested to build LuaJIT separately using the supplied build system. Please do not attempt to integrate the individual source files into your build tree. You'll most likely get the internal build dependencies wrong or mess up the compiler flags. Treat LuaJIT like any other external library and link your application with either the dynamic or static library, depending on your needs.
If you want to load C modules compiled for plain Lua with require(), you need to make sure the public symbols (e.g. lua_pushnumber) are exported, too:
- On POSIX systems you can either link to the shared library or link the static library into your application. In the latter case you'll need to export all public symbols from your main executable (e.g. -Wl,-E on Linux) and add the external dependencies (e.g. -lm -ldl on Linux).
- Since Windows symbols are bound to a specific DLL name, you need to link to the lua51.dll created by the LuaJIT build (do not rename the DLL). You may link LuaJIT statically on Windows only if you don't intend to load Lua/C modules at runtime.
If you're building a 64 bit application on OSX which links directly or indirectly against LuaJIT which is not built for LJ_GC64 mode, you need to link your main executable with these flags:
```
-pagezero_size 10000 -image_base 100000000
```

Additional hints for initializing LuaJIT using the C API functions:

Here's a » simple example for embedding Lua or LuaJIT into your application.
Make sure you use luaL_newstate. Avoid using lua_newstate, since this uses the (slower) default memory allocator from your system (no support for this on x64).
Make sure you use luaL_openlibs and not the old Lua 5.0 style of calling luaopen_base etc. directly.
To change or extend the list of standard libraries to load, copy src/lib_init.c to your project and modify it accordingly. Make sure the jit library is loaded or the JIT compiler will not be activated.
The bit.* module for bitwise operations is already built-in. There's no need to statically link » Lua BitOp to your application.

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:

PREFIX overrides the installation path and should usually be set to /usr. Setting this also changes the module paths and the paths needed to locate the shared library.
DESTDIR is an absolute path which allows you to install to a shadow tree instead of the root tree of the build system.
MULTILIB sets the architecture-specific library path component for multilib systems. The default is lib.
Have a look at the top-level Makefile and src/Makefile for additional variables to tweak. The following variables may be overridden, but it's not recommended, except for special needs like cross-builds: BUILDMODE, CC, HOST_CC, STATIC_CC, DYNAMIC_CC, CFLAGS, HOST_CFLAGS, TARGET_CFLAGS, LDFLAGS, HOST_LDFLAGS, TARGET_LDFLAGS, TARGET_SHLDFLAGS, TARGET_FLAGS, LIBS, HOST_LIBS, TARGET_LIBS, CROSS, HOST_SYS, TARGET_SYS

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.