Hi all,

I successfully build LineageOS 21 on my Ubuntu 20.04 machine for the emulator:

cd lineageos
source build/envsetup.sh
breakfast sdk_phone_x86_64
mka

Next, I wanted to integrate a native C application to the ROM. I did the following steps:

1) Create the native C app “helloworld”

cd lineageos
mkdir -p external/helloworld
nano external/helloworld/helloworld.c

Added the following code to helloworld.c

/* external/helloworld/helloworld.c */

#include <stdio.h>  
  
int main() {  
    printf("Hello, World!n");  
    return 0;  
}  

2) Create the blueprint file

Create the Android.bp file within the external/helloworld directory:

nano external/helloworld/Android.bp

Added the following content:

cc_binary {  
    name: "helloworld",  
    srcs: ["helloworld.c"],  
    installable: true,  
    relative_install_path: "bin",  
}  

And now I am little bit stuck and don’t know how and where to add the helloworld app into the build process so that the command mka builds also my native app and integrates it into the ROM.

I tried the following without success:

3) Modify the emulator prodict makefile

nano device/generic/goldfish/product/generic.mk

Added the following content at the end of the file:

PRODUCT_PACKAGES += helloworld

4) Clean and build

make clean
source build/envsetup.sh
breakfast sdk_phone_x86_64
mka

This results in the following error:

I get the error:

build/make/core/artifact_path_requirements.mk:31: warning: vendor/lineage/build/target/product/lineage_sdk_phone_x86_64.mk produces files inside build/make/target/product/generic_system.mks artifact path requirement.
Offending entries:
system/bin/helloworld
In file included from build/make/core/main.mk:1433:
build/make/core/artifact_path_requirements.mk:31: error: Build failed.

How to make this work? How to correctly integrate the native C helloworld app into the ROM?

Thanks in advance for providing any ideas and hints 🙂