-This always builds a native x86, x64 or PPC binary, depending on the host OS +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.
@@ -333,25 +333,36 @@ directory where luajit.exe is installed-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"). +First, let's clear up some terminology:
++The GNU Makefile-based build system allows cross-compiling on any host +for any supported target: +
+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. +target OS differ, or you'll get assembler or linker errors:
+-The examples below only show some popular targets — please check -the comments in src/Makefile for more details. +Here are some examples where host and target have the same CPU:
# Cross-compile to a 32 bit binary on a multilib x64 OS @@ -369,26 +380,30 @@ 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. +important to compile with the proper CPU or architecture 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-A8)
+# ARM soft-float ABI with VFP (example for Cortex-A9)
make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabi- \
- TARGET_CFLAGS="-mcpu=cortex-a8 -mfloat-abi=softfp"
+ TARGET_CFLAGS="-mcpu=cortex-a9 -mfloat-abi=softfp"
-# ARM hard-float ABI with VFP (armhf, requires recent toolchain)
+# ARM hard-float ABI with VFP (armhf, most modern toolchains)
make HOST_CC="gcc -m32" CROSS=arm-linux-gnueabihf-
-# ARM64 (requires x64 host)
+# ARM64
make CROSS=aarch64-linux-
# PPC
@@ -400,7 +415,7 @@ make HOST_CC="gcc -m32" CROSS=mips-linux-
make HOST_CC="gcc -m32" CROSS=mipsel-linux-
-You can cross-compile for Android using the » Android NDK. +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. @@ -414,7 +429,7 @@ 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=$NDK/toolchains/arm-linux-androideabi-4.6 +NDKVER=$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" @@ -422,16 +437,16 @@ 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=$NDK/toolchains/arm-linux-androideabi-4.6 +NDKVER=$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 $NDKARCH" -# Android/MIPS, mips (MIPS32R1 hard-float), Android 4.0+ (ICS) +# Android/MIPS, mipsel (MIPS32R1 hard-float), Android 4.0+ (ICS) NDK=/opt/android/ndk NDKABI=14 -NDKVER=$NDK/toolchains/mipsel-linux-android-4.6 +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" @@ -439,7 +454,7 @@ 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=$NDK/toolchains/x86-4.6 +NDKVER=$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"