Creating an android binary using NDK

// from https://stackoverflow.com/questions/10798357/want-to-compile-native-android-binary-i-can-run-in-terminal-on-the-phone
/*
# create tool-chain - one line
# New method in ndk 12.
$NDK/build/tools/make_standalone_toolchain.py --arch arm --install-dir=/tmp/my-android-toolchain
# Old method.
#$NDK/build/tools/make-standalone-toolchain.sh --platform=android-3 --install-dir=/tmp/my-android-toolchain

# add to terminal PATH variable
export PATH=/tmp/my-android-toolchain/bin:$PATH

# make alias CC be the new gcc binary
export CC=arm-linux-androideabi-gcc

# compile your C code(I tried hello world)
$CC -o foo test-ndk.c

# push binary to phone
adb push test-ndk /data/local/tmp

# execute binary
adb shell
$ /data/local/tmp/test-ndk
*/

#include <stdio.h>

int
main(void)
{
  printf("test-ndk works\n");
  return 0;
}

another tutorial here: https://explog.in/notes/droidbinary.html