How to compile and run a simple C code for Android?

Question

Here is the basic C source code :

#include <stdio.h> int main(void) { puts("hello world!"); return 0; }

I am able to compile for Android with NDK toolchain with :

aarch64-linux-android21-clang test.c

It generates an a.out file that I transfer to the Android device with :

adb push a.out /data/local/tmp adb shell chmod 777 /data/local/tmp/a.out

When I try to run it with:

adb shell /data/local/tmp/a.out

I have the message : "/system/bin/sh: /data/local/tmp/a.out: No such file or directory"

What am I doing wrong?

Waht kind of android device do you have? Is it Arm64 with 64-bit kernel? — Eugene Sh.
– Eugene Sh., Commented Jan 29, 2021 at 15:04
I have just made a new test with "armv7a-linux-androideabi16-clang test.c" and now it seems to run well on the device but I have a message "WARNING: linker: /data/local/tmp/a.out: unsupported flags DT_FLAGS_1=0x8000001" — KotlinIsland
– KotlinIsland, Commented Jan 29, 2021 at 15:09

abdelltif sabri · Accepted Answer · 2022-02-27 03:36:22Z

you can use this nodejs script to automate build and test your c/c++ program for android

 let cpp=` #include<iostream> #include<string> using namespace std; int main(){ cout<<"hellow word"<<endl; return 0; } ` let args=['--target=armv7a-linux-androideabi23'] let cpu="armeabi-v7a" wfs('test.cpp',cpp) args.push("test.cpp") args.push("-static-libstdc++") //in case you want to build sharedlib uncomment next line //args.push("-shared") lg=run(runners.clang,args) lg=run(runners.adb,'push a.out /data/local/tmp/a.out') //in case -static-libstdc++ not used uncomment next line; //copy c++_shared to same dir where to a.out //run(adb,'push c++_shared.so /data/local/tmp/c++_shared.so') let shellcmd=[]; shellcmd.push("cd /data/local/tmp") //in case -static-libstdc++ not used uncomment next line; // shellcmd.push("export LD_LIBRARY_PATH=.") shellcmd.push("chmod +x a.out") shellcmd.push("./a.out") // a.out excution result let output=run(runners.adb,`shell "${shellcmd.join("&&")}"`) lg(output) //++++++++++utilis++++++++++ function lg(...args){ console.log(...args) } function run(cmd,args){ if(args) cmd= cmd+" "+args.join(" "); return require('child_process').execSync(cmd); } function wfs(p,data){ require("fs").writeFileSync(p,data) }

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KotlinIsland · Accepted Answer · 2021-01-29 19:25:14Z

In my case, I had to use "armv7a-linux-androideabiXX-clang" for compilation and then it is ok. XX must be replaced by the API version.

On my windows system, clang binaries and scripts are in the folder "D:\AndroidSdk\ndk\21.1.6352462\toolchains\llvm\prebuilt\windows-x86_64\bin"

The most recent script that can be used is "armv7a-linux-androideabi29-clang++.cmd" and it is ok for compiling C sourcecodes for running on Samsung A3 phones in my case.

I think this is because this is not a 64-bit kernel and I figured that out after Eugene Sh asked me in comments to this question (if he adds an answer then I'll accept it).

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How to compile and run a simple C code for Android?

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you can use this nodejs script to automate build and test your c/c++ program for android

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you can use this nodejs script to automate build and test your c/c++ program for android

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