android.mk | Informational website for Android NDK and AOSP Makefiles | Aspect Oriented library

I have a binary, with Android.mk as below.

I need to build an Android 9 image which includes some prebuilt APKs (OpenVPNForAndroid, in this specific case).

The APK, downloaded from f-droid, includes some libraries that are loaded dynamically. I've added it to the image with the Android.mk file below; the app is installed and starts normally, but fails when I try to connect with this error:

Error Logs

External native generate JSON release: executing ndkBuild Executable : /Users/nidhinagvanshi/Library/Android/sdk/ndk/20.0.5594570/ndk-build arguments : NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=/Users/nidhinagvanshi/Downloads/VirtualApp-master-2/VirtualApp/lib/src/main/jni/Android.mk NDK_APPLICATION_MK=/Users/nidhinagvanshi/Downloads/VirtualApp-master-2/VirtualApp/lib/src/main/jni/Application.mk APP_ABI=x86 NDK_ALL_ABIS=x86 NDK_DEBUG=0 APP_PLATFORM=android-16 NDK_OUT=/Users/nidhinagvanshi/Downloads/VirtualApp-master-2/VirtualApp/lib/build/intermediates/ndkBuild/release/obj NDK_LIBS_OUT=/Users/nidhinagvanshi/Downloads/VirtualApp-master-2/VirtualApp/lib/build/intermediates/ndkBuild/release/lib APP_SHORT_COMMANDS=false LOCAL_SHORT_COMMANDS=false

-n jvmArgs :

/Users/nidhinagvanshi/Library/Android/sdk/ndk/20.0.5594570/build/core/add-application.mk:178: *** Android NDK: APP_STL gnustl_static is no longer supported. Please switch to either c++_static or c++_shared. See https://developer.android.com/ndk/guides/cpp-support.html for more information. . Stop. External native generate JSON release: using platform version 16 for ABI ARMEABI_V7A and min SDK version 14 External native generate JSON release: rebuilding JSON /Users/nidhinagvanshi/Downloads/VirtualApp-master-2/VirtualApp/lib/.externalNativeBuild/ndkBuild/release/armeabi-v7a/android_gradle_build.json due to: External native generate JSON release: - expected json /Users/nidhinagvanshi/Downloads/VirtualApp-master-2/VirtualApp/lib/.externalNativeBuild/ndkBuild/release/armeabi-v7a/android_gradle_build.json file is not present, will remove stale json folder External native generate JSON release: - missing previous command file /Users/nidhinagvanshi/Downloads/VirtualApp-master-2/VirtualApp/lib/.externalNativeBuild/ndkBuild/release/armeabi-v7a/ndkBuild_build_command.txt, will remove stale json folder

Android.mk

I am trying to build LineageOS 17.1 bacon based on the steps here: https://wiki.lineageos.org/devices/bacon/build

All steps until the below failure have been successful. Everything is the latest leading to LINEAGE_VERSION=17.1-20210324-UNOFFICIAL-bacon

brunch bacon returns the following failure. This is my first android build, web search did not yield anything useful on how to fix this. Currently, I am clueless, any help/suggestions on how to fix this are very welcome.

Trying ndk-build C code debug in Android studio(v4.1.2).Below is build.gradle setup.

1. jni , C/C++ Source files Dirs. Actual C files are not under jni folder but outside it but referred in android.mk file.

   sourceSets.main.jniLibs.srcDirs = ['D:/ccodefolder/jni/']

2)Android.mk Builds a shared library from C , c++ code and also links inbuilt shared and static libraries.

Is it possible to link multiple native libraries(written in C) in build.gradle like this:

I'm trying to build Android's adb from source code, which I downloaded from here.

I tried to use NDK21 and its ndk-build, but got this error

This software compiles for x86_64 linux and windows. It's written in C+ and relies heavily on the SDL as well as depending on libraries such as curl, microhttp, libharu, etc. Some 2 years ago it also compiled for android x86 and arm32 using Pelya's [commandergenious][1] port but that knowledge was lost, development continued and i'm the newcomer. I'm not that versed on Android or their take on makefiles.

I managed to include one library (haru) in commandergenious but trying to include other libraries resulted in multiple failures, so kinda stopped at that. I also had some issues using custom makefiles as suggested in the readme.

I've adapted an existing regular makefile but it ends up conflicting with existing dependencies, i.e., ndk-compiled cyptopp.so would cause undefined symbols on clang-compiled app, even though the signatures are "the same" (std::__ndk1::basic_string vs std::__cxx11::basic_string).

I've since taken to recompiling the code with clang instead of gcc (fixing a few bugs on the way due to clang being more strict) and using Android.mk instead of regular makefiles so i could cross-compile all components using just the NDK.

I tried giving a go at Android's LOCAL_MODULEs but the interdependent LOCAL_PATHs became too messy. I may get back to this route using [prebuilts][2] instead. It'll help segregate some issues should they arise.

Since my host is x86_68 Ubuntu Xenial i took the (maybe incorrect) path of setting up a directory with armeabi-v7a arm64-v8a x86 x86_64 subdirectories and ar xing .deb files (from Debian Buster as Xenial has sparse arm .debs) into those for all the libraries and includes i need. (It's $(HOME)/dev/multiarch bellow.)

At the moment, this is my Application.mk

I'm looking at platform/frameworks/base. It looks like it's a lot of things from Android's core. It's mainly in Java: https://github.com/GrapheneOS/platform_frameworks_base/blob/11/Android.mk

When we look into its Android.mk file, the most interesting part is: