Android build is no more works

[Wohlstand]

Trying to compile for Android by existing way gives no result, and article needs to be updated:

• Latest Android NDK does using of CLang
• Attempt to compile REQUIRES complete multilib be installed into 64-bit system, otherwise, will not work with strong errors
• Given toolchains are now 64-bit only
• Oldest available ABI is 16

It's my attempt to compile for ARMv7 as example:

#!/bin/bash

# Android/ARM, armeabi-v7a (ARMv7 VFP)
NDK=/home/${USER}/Android/Sdk/ndk-bundle
NDKABI=16
NDKVER=$NDK/toolchains/llvm
NDKP=$NDKVER/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi$NDKABI-
NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-arm"
NDKARCH="-march=armv7-a -mfloat-abi=softfp"
make DEFAULT_CC=clang HOST_CC="clang -m32" CROSS=$NDKP TARGET_FLAGS="$NDKF $NDKARCH"

I think the manual here http://luajit.org/install.html is VERY outdated and needs to be actualized...

It's good that I using in my project the PUC-Rio lua as a fallback for target platforms where LuaJIT can't be built.

The question: what wrong in my script if I it's my fault?

Currently, I have error of missing <string.h> while building, possibly, because of missing or incorrect include path...

[Wohlstand]

Android build is completely resolving with CMake build: #476

[MikuAuahDark]

I successfully compiled LuaJIT using NDK r16b under Windows using Android ARM64 standalone toolchain. It should be even easier in Linux I guess. Here's the command-line (assume you have 64-bit GCC, Make, and aarch64-linux-android toolchain in your PATH):

make XCFLAGS="-D__ANDROID_API__=21" CROSS=aarch64-linux-android- TARGET_SYS=Linux -j4

And for amalgamated build, just add amalg after the command above.

Thing to note in here is that you have to specify __ANDROID_API__ to correct Android API level. Otherwise it will complain about undefined reference to stdin, stdout, and stderr.

[Wohlstand]

However, with newer NDKs are using CLang, will fail.

[MikuAuahDark]

Sorry for the long reply. I have to re-read the new NDK r19 toolchain system.

According to this page, all NDK r19 toolchains can be used in-place, so it's just matter having your PATH environment variable set to the location described there (in my case, it's %ANDROID_NDK_HOME%\toolchains\llvm\prebuilt\windows-x86_64\bin) and invoke LuaJIT makefile like this (in my case I target Android API level 21):

set TARGET_ANDROID_API_LEVEL=21
make ^
CROSS=aarch64-linux-android- ^
XCFLAGS="-D__ANDROID_API__=%TARGET_ANDROID_API_LEVEL%" ^
TARGET_SYS=Linux ^
STATIC_CC=aarch64-linux-android%TARGET_ANDROID_API_LEVEL%-clang ^
DYNAMIC_CC="aarch64-linux-android%TARGET_ANDROID_API_LEVEL%-clang -fPIC" ^
TARGET_LD=aarch64-linux-android%TARGET_ANDROID_API_LEVEL%-clang

However, I agree that CMake will solve this pain and provide better support for out-of-tree build.

Testing is done using MSYS64 Makefile + GCC in Windows 10 1809 (patch 404) with Android NDK r19c. There's problem using clang for host compiler in Windows (#431) so GCC must be used.

[MikePall]

The documentation has been updated to work with the latest NDK.

[JCash]

I think the documentation could now be updated again, since the "gcc" doesn't exist in the NDK anymore.