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?

Answer 1

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)
            }

Answer 2

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).