source/libs/luajit/LuaJIT-src/doc/install.html

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  42 <a href="http://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
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  45 <h1>Installation</h1>
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  91 <p>
  92 LuaJIT is only distributed as a source package. This page explains
  93 how to build and install LuaJIT with different operating systems
  94 and C&nbsp;compilers.
  95 </p>
  96 <p>
  97 For the impatient (on POSIX systems):
  98 </p>
  99 <pre class="code">
 100 make &amp;&amp; sudo make install
 101 </pre>
 102 <p>
 103 LuaJIT currently builds out-of-the box on most systems.
 104 Here's the compatibility matrix for the supported combinations of
 105 operating systems, CPUs and compilers:
 106 </p>
 107 <table class="compat">
 108 <tr class="compathead">
 109 <td class="compatcpu">CPU / OS</td>
 110 <td class="compatos"><a href="#posix">Linux</a> or<br><a href="#android">Android</a></td>
 111 <td class="compatos"><a href="#posix">*BSD, Other</a></td>
 112 <td class="compatos"><a href="#posix">OSX 10.4+</a> or<br><a href="#ios">iOS 3.0+</a></td>
 113 <td class="compatos"><a href="#windows">Windows<br>XP/Vista/7</a></td>
 114 </tr>
 115 <tr class="odd separate">
 116 <td class="compatcpu">x86 (32 bit)</td>
 117 <td class="compatos">GCC 4.x<br>GCC 3.4</td>
 118 <td class="compatos">GCC 4.x<br>GCC 3.4</td>
 119 <td class="compatos">GCC 4.x<br>GCC 3.4</td>
 120 <td class="compatos">MSVC, MSVC/EE<br>WinSDK<br>MinGW, Cygwin</td>
 121 </tr>
 122 <tr class="even">
 123 <td class="compatcpu">x64 (64 bit)</td>
 124 <td class="compatos">GCC 4.x</td>
 125 <td class="compatos">ORBIS (<a href="#ps4">PS4</a>)</td>
 126 <td class="compatos">GCC 4.x</td>
 127 <td class="compatos">MSVC + SDK v7.0<br>WinSDK v7.0<br>Durango (<a href="#xboxone">Xbox One</a>)</td>
 128 </tr>
 129 <tr class="odd">
 130 <td class="compatcpu"><a href="#cross2">ARMv5+<br>ARM9E+</a></td>
 131 <td class="compatos">GCC 4.2+</td>
 132 <td class="compatos">GCC 4.2+<br>PSP2 (<a href="#psvita">PS VITA</a>)</td>
 133 <td class="compatos">GCC 4.2+</td>
 134 <td class="compatos compatno">&nbsp;</td>
 135 </tr>
 136 <tr class="even">
 137 <td class="compatcpu"><a href="#cross2">ARM64</a></td>
 138 <td class="compatos">GCC 4.8+</td>
 139 <td class="compatos compatno">&nbsp;</td>
 140 <td class="compatos">Clang 3.5+</td>
 141 <td class="compatos compatno">&nbsp;</td>
 142 </tr>
 143 <tr class="odd">
 144 <td class="compatcpu"><a href="#cross2">PPC</a></td>
 145 <td class="compatos">GCC 4.3+</td>
 146 <td class="compatos">GCC 4.3+<br>GCC 4.1 (<a href="#ps3">PS3</a>)</td>
 147 <td class="compatos compatno">&nbsp;</td>
 148 <td class="compatos">XEDK (<a href="#xbox360">Xbox 360</a>)</td>
 149 </tr>
 150 <tr class="even">
 151 <td class="compatcpu"><a href="#cross2">MIPS</a></td>
 152 <td class="compatos">GCC 4.3+</td>
 153 <td class="compatos">GCC 4.3+</td>
 154 <td class="compatos compatno">&nbsp;</td>
 155 <td class="compatos compatno">&nbsp;</td>
 156 </tr>
 157 </table>
 158
 159 <h2>Configuring LuaJIT</h2>
 160 <p>
 161 The standard configuration should work fine for most installations.
 162 Usually there is no need to tweak the settings. The following files
 163 hold all user-configurable settings:
 164 </p>
 165 <ul>
 166 <li><tt>src/luaconf.h</tt> sets some configuration variables.</li>
 167 <li><tt>Makefile</tt> has settings for <b>installing</b> LuaJIT (POSIX
 168 only).</li>
 169 <li><tt>src/Makefile</tt> has settings for <b>compiling</b> LuaJIT
 170 under POSIX, MinGW or Cygwin.</li>
 171 <li><tt>src/msvcbuild.bat</tt> has settings for compiling LuaJIT with
 172 MSVC or WinSDK.</li>
 173 </ul>
 174 <p>
 175 Please read the instructions given in these files, before changing
 176 any settings.
 177 </p>
 178
 179 <h2 id="posix">POSIX Systems (Linux, OSX, *BSD etc.)</h2>
 180 <h3>Prerequisites</h3>
 181 <p>
 182 Depending on your distribution, you may need to install a package for
 183 GCC, the development headers and/or a complete SDK. E.g. on a current
 184 Debian/Ubuntu, install <tt>libc6-dev</tt> with the package manager.
 185 </p>
 186 <p>
 187 Download the current source package of LuaJIT (pick the .tar.gz),
 188 if you haven't already done so. Move it to a directory of your choice,
 189 open a terminal window and change to this directory. Now unpack the archive
 190 and change to the newly created directory:
 191 </p>
 192 <pre class="code">
 193 tar zxf LuaJIT-2.0.4.tar.gz
 194 cd LuaJIT-2.0.4</pre>
 195 <h3>Building LuaJIT</h3>
 196 <p>
 197 The supplied Makefiles try to auto-detect the settings needed for your
 198 operating system and your compiler. They need to be run with GNU Make,
 199 which is probably the default on your system, anyway. Simply run:
 200 </p>
 201 <pre class="code">
 202 make
 203 </pre>
 204 <p>
 205 This always builds a native x86, x64 or PPC binary, depending on the host OS
 206 you're running this command on. Check the section on
 207 <a href="#cross">cross-compilation</a> for more options.
 208 </p>
 209 <p>
 210 By default, modules are only searched under the prefix <tt>/usr/local</tt>.
 211 You can add an extra prefix to the search paths by appending the
 212 <tt>PREFIX</tt> option, e.g.:
 213 </p>
 214 <pre class="code">
 215 make PREFIX=/home/myself/lj2
 216 </pre>
 217 <p>
 218 Note for OSX: if the <tt>MACOSX_DEPLOYMENT_TARGET</tt> environment
 219 variable is not set, then it's forced to <tt>10.4</tt>.
 220 </p>
 221 <h3>Installing LuaJIT</h3>
 222 <p>
 223 The top-level Makefile installs LuaJIT by default under
 224 <tt>/usr/local</tt>, i.e. the executable ends up in
 225 <tt>/usr/local/bin</tt> and so on. You need root privileges
 226 to write to this path. So, assuming sudo is installed on your system,
 227 run the following command and enter your sudo password:
 228 </p>
 229 <pre class="code">
 230 sudo make install
 231 </pre>
 232 <p>
 233 Otherwise specify the directory prefix as an absolute path, e.g.:
 234 </p>
 235 <pre class="code">
 236 make install PREFIX=/home/myself/lj2
 237 </pre>
 238 <p>
 239 Obviously the prefixes given during build and installation need to be the same.
 240 </p>
 241
 242 <h2 id="windows">Windows Systems</h2>
 243 <h3>Prerequisites</h3>
 244 <p>
 245 Either install one of the open source SDKs
 246 (<a href="http://mingw.org/"><span class="ext">&raquo;</span>&nbsp;MinGW</a> or
 247 <a href="http://www.cygwin.com/"><span class="ext">&raquo;</span>&nbsp;Cygwin</a>), which come with a modified
 248 GCC plus the required development headers.
 249 </p>
 250 <p>
 251 Or install Microsoft's Visual C++ (MSVC). The freely downloadable
 252 <a href="http://www.microsoft.com/Express/VC/"><span class="ext">&raquo;</span>&nbsp;Express Edition</a>
 253 works just fine, but only contains an x86 compiler.
 254 </p>
 255 <p>
 256 The freely downloadable
 257 <a href="http://msdn.microsoft.com/en-us/windowsserver/bb980924.aspx"><span class="ext">&raquo;</span>&nbsp;Windows SDK</a>
 258 only comes with command line tools, but this is all you need to build LuaJIT.
 259 It contains x86 and x64 compilers.
 260 </p>
 261 <p>
 262 Next, download the source package and unpack it using an archive manager
 263 (e.g. the Windows Explorer) to a directory of your choice.
 264 </p>
 265 <h3>Building with MSVC</h3>
 266 <p>
 267 Open a "Visual Studio .NET Command Prompt", <tt>cd</tt> to the
 268 directory where you've unpacked the sources and run these commands:
 269 </p>
 270 <pre class="code">
 271 cd src
 272 msvcbuild
 273 </pre>
 274 <p>
 275 Then follow the installation instructions below.
 276 </p>
 277 <h3>Building with the Windows SDK</h3>
 278 <p>
 279 Open a "Windows SDK Command Shell" and select the x86 compiler:
 280 </p>
 281 <pre class="code">
 282 setenv /release /x86
 283 </pre>
 284 <p>
 285 Or select the x64 compiler:
 286 </p>
 287 <pre class="code">
 288 setenv /release /x64
 289 </pre>
 290 <p>
 291 Then <tt>cd</tt> to the directory where you've unpacked the sources
 292 and run these commands:
 293 </p>
 294 <pre class="code">
 295 cd src
 296 msvcbuild
 297 </pre>
 298 <p>
 299 Then follow the installation instructions below.
 300 </p>
 301 <h3>Building with MinGW or Cygwin</h3>
 302 <p>
 303 Open a command prompt window and make sure the MinGW or Cygwin programs
 304 are in your path. Then <tt>cd</tt> to the directory where
 305 you've unpacked the sources and run this command for MinGW:
 306 </p>
 307 <pre class="code">
 308 mingw32-make
 309 </pre>
 310 <p>
 311 Or this command for Cygwin:
 312 </p>
 313 <pre class="code">
 314 make
 315 </pre>
 316 <p>
 317 Then follow the installation instructions below.
 318 </p>
 319 <h3>Installing LuaJIT</h3>
 320 <p>
 321 Copy <tt>luajit.exe</tt> and <tt>lua51.dll</tt> (built in the <tt>src</tt>
 322 directory) to a newly created directory (any location is ok).
 323 Add <tt>lua</tt> and <tt>lua\jit</tt> directories below it and copy
 324 all Lua files from the <tt>src\jit</tt> directory of the distribution
 325 to the latter directory.
 326 </p>
 327 <p>
 328 There are no hardcoded
 329 absolute path names &mdash; all modules are loaded relative to the
 330 directory where <tt>luajit.exe</tt> is installed
 331 (see <tt>src/luaconf.h</tt>).
 332 </p>
 333
 334 <h2 id="cross">Cross-compiling LuaJIT</h2>
 335 <p>
 336 The GNU Makefile-based build system allows cross-compiling on any host
 337 for any supported target, as long as both architectures have the same
 338 pointer size. If you want to cross-compile to any 32 bit target on an
 339 x64 OS, you need to install the multilib development package (e.g.
 340 <tt>libc6-dev-i386</tt> on Debian/Ubuntu) and build a 32 bit host part
 341 (<tt>HOST_CC="gcc -m32"</tt>).
 342 </p>
 343 <p>
 344 You need to specify <tt>TARGET_SYS</tt> whenever the host OS and the
 345 target OS differ, or you'll get assembler or linker errors. E.g. if
 346 you're compiling on a Windows or OSX host for embedded Linux or Android,
 347 you need to add <tt>TARGET_SYS=Linux</tt> to the examples below. For a
 348 minimal target OS, you may need to disable the built-in allocator in
 349 <tt>src/Makefile</tt> and use <tt>TARGET_SYS=Other</tt>. The examples
 350 below only show some popular targets &mdash; please check the comments
 351 in <tt>src/Makefile</tt> for more details.
 352 </p>
 353 <pre class="code">
 354 # Cross-compile to a 32 bit binary on a multilib x64 OS
 355 make CC="gcc -m32"
 356
 357 # Cross-compile on Debian/Ubuntu for Windows (mingw32 package)
 358 make HOST_CC="gcc -m32" CROSS=i586-mingw32msvc- TARGET_SYS=Windows
 359 </pre>
 360 <p id="cross2">
 361 The <tt>CROSS</tt> prefix allows specifying a standard GNU cross-compile
 362 toolchain (Binutils, GCC and a matching libc). The prefix may vary
 363 depending on the <tt>--target</tt> the toolchain was built for (note the
 364 <tt>CROSS</tt> prefix has a trailing <tt>"-"</tt>). The examples below
 365 use the canonical toolchain triplets for Linux.
 366 </p>
 367 <p>
 368 Since there's often no easy way to detect CPU features at runtime, it's
 369 important to compile with the proper CPU or architecture settings. You
 370 can specify these when building the toolchain yourself. Or add
 371 <tt>-mcpu=...</tt> or <tt>-march=...</tt> to <tt>TARGET_CFLAGS</tt>. For
 372 ARM it's important to have the correct <tt>-mfloat-abi=...</tt> setting,
 373 too. Otherwise LuaJIT may not run at the full performance of your target
 374 CPU.
 375 </p>
 376 <pre class="code">
 377 # ARM soft-float
 378 make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabi- \
 379      TARGET_CFLAGS="-mfloat-abi=soft"
 380
 381 # ARM soft-float ABI with VFP (example for Cortex-A8)
 382 make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabi- \
 383      TARGET_CFLAGS="-mcpu=cortex-a8 -mfloat-abi=softfp"
 384
 385 # ARM hard-float ABI with VFP (armhf, requires recent toolchain)
 386 make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabihf-
 387
 388 # ARM64 (requires x64 host)
 389 make CROSS=aarch64-linux-
 390
 391 # PPC
 392 make HOST_CC="gcc -m32" CROSS=powerpc-linux-gnu-
 393
 394 # MIPS big-endian
 395 make HOST_CC="gcc -m32" CROSS=mips-linux-
 396 # MIPS little-endian
 397 make HOST_CC="gcc -m32" CROSS=mipsel-linux-
 398 </pre>
 399 <p>
 400 You can cross-compile for <b id="android">Android</b> using the <a href="http://developer.android.com/sdk/ndk/index.html"><span class="ext">&raquo;</span>&nbsp;Android NDK</a>.
 401 The environment variables need to match the install locations and the
 402 desired target platform. E.g. Android&nbsp;4.0 corresponds to ABI level&nbsp;14.
 403 For details check the folder <tt>docs</tt> in the NDK directory.
 404 </p>
 405 <p>
 406 Only a few common variations for the different CPUs, ABIs and platforms
 407 are listed. Please use your own judgement for which combination you want
 408 to build/deploy or which lowest common denominator you want to pick:
 409 </p>
 410 <pre class="code">
 411 # Android/ARM, armeabi (ARMv5TE soft-float), Android 2.2+ (Froyo)
 412 NDK=/opt/android/ndk
 413 NDKABI=8
 414 NDKVER=$NDK/toolchains/arm-linux-androideabi-4.6
 415 NDKP=$NDKVER/prebuilt/linux-x86/bin/arm-linux-androideabi-
 416 NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-arm"
 417 make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF"
 418
 419 # Android/ARM, armeabi-v7a (ARMv7 VFP), Android 4.0+ (ICS)
 420 NDK=/opt/android/ndk
 421 NDKABI=14
 422 NDKVER=$NDK/toolchains/arm-linux-androideabi-4.6
 423 NDKP=$NDKVER/prebuilt/linux-x86/bin/arm-linux-androideabi-
 424 NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-arm"
 425 NDKARCH="-march=armv7-a -mfloat-abi=softfp -Wl,--fix-cortex-a8"
 426 make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF $NDKARCH"
 427
 428 # Android/MIPS, mips (MIPS32R1 hard-float), Android 4.0+ (ICS)
 429 NDK=/opt/android/ndk
 430 NDKABI=14
 431 NDKVER=$NDK/toolchains/mipsel-linux-android-4.6
 432 NDKP=$NDKVER/prebuilt/linux-x86/bin/mipsel-linux-android-
 433 NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-mips"
 434 make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF"
 435
 436 # Android/x86, x86 (i686 SSE3), Android 4.0+ (ICS)
 437 NDK=/opt/android/ndk
 438 NDKABI=14
 439 NDKVER=$NDK/toolchains/x86-4.6
 440 NDKP=$NDKVER/prebuilt/linux-x86/bin/i686-linux-android-
 441 NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-x86"
 442 make HOST_CC="gcc -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF"
 443 </pre>
 444 <p>
 445 You can cross-compile for <b id="ios">iOS 3.0+</b> (iPhone/iPad) using the <a href="http://developer.apple.com/devcenter/ios/index.action"><span class="ext">&raquo;</span>&nbsp;iOS SDK</a>.
 446 The environment variables need to match the iOS SDK version:
 447 </p>
 448 <p style="font-size: 8pt;">
 449 Note: <b>the JIT compiler is disabled for iOS</b>, because regular iOS Apps
 450 are not allowed to generate code at runtime. You'll only get the performance
 451 of the LuaJIT interpreter on iOS. This is still faster than plain Lua, but
 452 much slower than the JIT compiler. Please complain to Apple, not me.
 453 Or use Android. :-p
 454 </p>
 455 <pre class="code">
 456 IXCODE=`xcode-select -print-path`
 457 ISDK=$IXCODE/Platforms/iPhoneOS.platform/Developer
 458 ISDKVER=iPhoneOS6.0.sdk
 459 ISDKP=$ISDK/usr/bin/
 460 ISDKF="-arch armv7 -isysroot $ISDK/SDKs/$ISDKVER"
 461 make HOST_CC="gcc -m32 -arch i386" CROSS=$ISDKP TARGET_FLAGS="$ISDKF" \
 462      TARGET_SYS=iOS
 463 </pre>
 464
 465 <h3 id="consoles">Cross-compiling for consoles</h3>
 466 <p>
 467 Building LuaJIT for consoles requires both a supported host compiler
 468 (x86 or x64) and a cross-compiler (to PPC or ARM) from the official
 469 console SDK.
 470 </p>
 471 <p>
 472 Due to restrictions on consoles, the JIT compiler is disabled and only
 473 the fast interpreter is built. This is still faster than plain Lua,
 474 but much slower than the JIT compiler. The FFI is disabled, too, since
 475 it's not very useful in such an environment.
 476 </p>
 477 <p>
 478 The following commands build a static library <tt>libluajit.a</tt>,
 479 which can be linked against your game, just like the Lua library.
 480 </p>
 481 <p>
 482 To cross-compile for <b id="ps3">PS3</b> from a Linux host (requires
 483 32&nbsp;bit GCC, i.e. multilib Linux/x64) or a Windows host (requires
 484 32&nbsp;bit MinGW), run this command:
 485 </p>
 486 <pre class="code">
 487 make HOST_CC="gcc -m32" CROSS=ppu-lv2-
 488 </pre>
 489 <p>
 490 To cross-compile for <b id="ps4">PS4</b> from a Windows host,
 491 open a "Visual Studio .NET Command Prompt" (64&nbsp;bit host compiler),
 492 <tt>cd</tt> to the directory where you've unpacked the sources and
 493 run the following commands:
 494 </p>
 495 <pre class="code">
 496 cd src
 497 ps4build
 498 </pre>
 499 <p>
 500 To cross-compile for <b id="psvita">PS Vita</b> from a Windows host,
 501 open a "Visual Studio .NET Command Prompt" (32&nbsp;bit host compiler),
 502 <tt>cd</tt> to the directory where you've unpacked the sources and
 503 run the following commands:
 504 </p>
 505 <pre class="code">
 506 cd src
 507 psvitabuild
 508 </pre>
 509 <p>
 510 To cross-compile for <b id="xbox360">Xbox 360</b> from a Windows host,
 511 open a "Visual Studio .NET Command Prompt" (32&nbsp;bit host compiler),
 512 <tt>cd</tt> to the directory where you've unpacked the sources and run
 513 the following commands:
 514 </p>
 515 <pre class="code">
 516 cd src
 517 xedkbuild
 518 </pre>
 519 <p>
 520 To cross-compile for <b id="xboxone">Xbox One</b> from a Windows host,
 521 open a "Visual Studio .NET Command Prompt" (64&nbsp;bit host compiler),
 522 <tt>cd</tt> to the directory where you've unpacked the sources and run
 523 the following commands:
 524 </p>
 525 <pre class="code">
 526 cd src
 527 xb1build
 528 </pre>
 529
 530 <h2 id="embed">Embedding LuaJIT</h2>
 531 <p>
 532 LuaJIT is API-compatible with Lua 5.1. If you've already embedded Lua
 533 into your application, you probably don't need to do anything to switch
 534 to LuaJIT, except link with a different library:
 535 </p>
 536 <ul>
 537 <li>It's strongly suggested to build LuaJIT separately using the supplied
 538 build system. Please do <em>not</em> attempt to integrate the individual
 539 source files into your build tree. You'll most likely get the internal build
 540 dependencies wrong or mess up the compiler flags. Treat LuaJIT like any
 541 other external library and link your application with either the dynamic
 542 or static library, depending on your needs.</li>
 543 <li>If you want to load C modules compiled for plain Lua
 544 with <tt>require()</tt>, you need to make sure the public symbols
 545 (e.g. <tt>lua_pushnumber</tt>) are exported, too:
 546 <ul><li>On POSIX systems you can either link to the shared library
 547 or link the static library into your application. In the latter case
 548 you'll need to export all public symbols from your main executable
 549 (e.g. <tt>-Wl,-E</tt> on Linux) and add the external dependencies
 550 (e.g. <tt>-lm -ldl</tt> on Linux).</li>
 551 <li>Since Windows symbols are bound to a specific DLL name, you need to
 552 link to the <tt>lua51.dll</tt> created by the LuaJIT build (do not rename
 553 the DLL). You may link LuaJIT statically on Windows only if you don't
 554 intend to load Lua/C modules at runtime.
 555 </li></ul>
 556 </li>
 557 <li>
 558 If you're building a 64 bit application on OSX which links directly or
 559 indirectly against LuaJIT, you need to link your main executable
 560 with these flags:
 561 <pre class="code">
 562 -pagezero_size 10000 -image_base 100000000
 563 </pre>
 564 Also, it's recommended to <tt>rebase</tt> all (self-compiled) shared libraries
 565 which are loaded at runtime on OSX/x64 (e.g. C extension modules for Lua).
 566 See: <tt>man rebase</tt>
 567 </li>
 568 </ul>
 569 <p>Additional hints for initializing LuaJIT using the C API functions:</p>
 570 <ul>
 571 <li>Here's a
 572 <a href="http://lua-users.org/wiki/SimpleLuaApiExample"><span class="ext">&raquo;</span>&nbsp;simple example</a>
 573 for embedding Lua or LuaJIT into your application.</li>
 574 <li>Make sure you use <tt>luaL_newstate</tt>. Avoid using
 575 <tt>lua_newstate</tt>, since this uses the (slower) default memory
 576 allocator from your system (no support for this on x64).</li>
 577 <li>Make sure you use <tt>luaL_openlibs</tt> and not the old Lua 5.0 style
 578 of calling <tt>luaopen_base</tt> etc. directly.</li>
 579 <li>To change or extend the list of standard libraries to load, copy
 580 <tt>src/lib_init.c</tt> to your project and modify it accordingly.
 581 Make sure the <tt>jit</tt> library is loaded or the JIT compiler
 582 will not be activated.</li>
 583 <li>The <tt>bit.*</tt> module for bitwise operations
 584 is already built-in. There's no need to statically link
 585 <a href="http://bitop.luajit.org/"><span class="ext">&raquo;</span>&nbsp;Lua BitOp</a> to your application.</li>
 586 </ul>
 587
 588 <h2 id="distro">Hints for Distribution Maintainers</h2>
 589 <p>
 590 The LuaJIT build system has extra provisions for the needs of most
 591 POSIX-based distributions. If you're a package maintainer for
 592 a distribution, <em>please</em> make use of these features and
 593 avoid patching, subverting, autotoolizing or messing up the build system
 594 in unspeakable ways.
 595 </p>
 596 <p>
 597 There should be absolutely no need to patch <tt>luaconf.h</tt> or any
 598 of the Makefiles. And please do not hand-pick files for your packages &mdash;
 599 simply use whatever <tt>make install</tt> creates. There's a reason
 600 for all of the files <em>and</em> directories it creates.
 601 </p>
 602 <p>
 603 The build system uses GNU make and auto-detects most settings based on
 604 the host you're building it on. This should work fine for native builds,
 605 even when sandboxed. You may need to pass some of the following flags to
 606 <em>both</em> the <tt>make</tt> and the <tt>make install</tt> command lines
 607 for a regular distribution build:
 608 </p>
 609 <ul>
 610 <li><tt>PREFIX</tt> overrides the installation path and should usually
 611 be set to <tt>/usr</tt>. Setting this also changes the module paths and
 612 the paths needed to locate the shared library.</li>
 613 <li><tt>DESTDIR</tt> is an absolute path which allows you to install
 614 to a shadow tree instead of the root tree of the build system.</li>
 615 <li><tt>MULTILIB</tt> sets the architecture-specific library path component
 616 for multilib systems. The default is <tt>lib</tt>.</li>
 617 <li>Have a look at the top-level <tt>Makefile</tt> and <tt>src/Makefile</tt>
 618 for additional variables to tweak. The following variables <em>may</em> be
 619 overridden, but it's <em>not</em> recommended, except for special needs
 620 like cross-builds:
 621 <tt>BUILDMODE, CC, HOST_CC, STATIC_CC, DYNAMIC_CC, CFLAGS, HOST_CFLAGS,
 622 TARGET_CFLAGS, LDFLAGS, HOST_LDFLAGS, TARGET_LDFLAGS, TARGET_SHLDFLAGS,
 623 TARGET_FLAGS, LIBS, HOST_LIBS, TARGET_LIBS, CROSS, HOST_SYS, TARGET_SYS
 624 </tt></li>
 625 </ul>
 626 <p>
 627 The build system has a special target for an amalgamated build, i.e.
 628 <tt>make amalg</tt>. This compiles the LuaJIT core as one huge C file
 629 and allows GCC to generate faster and shorter code. Alas, this requires
 630 lots of memory during the build. This may be a problem for some users,
 631 that's why it's not enabled by default. But it shouldn't be a problem for
 632 most build farms. It's recommended that binary distributions use this
 633 target for their LuaJIT builds.
 634 </p>
 635 <p>
 636 The tl;dr version of the above:
 637 </p>
 638 <pre class="code">
 639 make amalg PREFIX=/usr && \
 640 make install PREFIX=/usr DESTDIR=/tmp/buildroot
 641 </pre>
 642 <p>
 643 Finally, if you encounter any difficulties, please
 644 <a href="contact.html">contact me</a> first, instead of releasing a broken
 645 package onto unsuspecting users. Because they'll usually gonna complain
 646 to me (the upstream) and not you (the package maintainer), anyway.
 647 </p>
 648 <br class="flush">
 649 </div>
 650 <div id="foot">
 651 <hr class="hide">
 652 Copyright &copy; 2005-2015 Mike Pall
 653 <span class="noprint">
 654 &middot;
 655 <a href="contact.html">Contact</a>
 656 </span>
 657 </div>
 658 </body>
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