darkirc: Add native Android cross-build instructions

bin/darkirc/README.md

@@ -2,3 +2,49 @@ darkirc
 =======
 
 [Installation Guide](https://darkrenaissance.github.io/darkfi/misc/darkirc/darkirc.html)
+
+## Android build
+
+1. Install `android-ndk`
+2. Compile `openssl` with the Android toolchain
+3. Compile `sqlcipher` with the Android toolchain and the `openssl` lib
+4. Compile `darkirc`
+
+### OpenSSL
+
+```
+$ git clone https://github.com/openssl/openssl
+$ cd openssl
+$ export ANDROID_NDK_ROOT="/opt/android-ndk"
+$ export PATH="$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH"
+$ ./Configure android-arm64 -D__ANDROID_API__=32
+$ make -j$(nproc)
+```
+
+### SQLcipher
+
+```
+$ git clone https://github.com/sqlcipher/sqlcipher
+$ cd sqlcipher
+$ sed -e 's/strchrnul//' -i configure
+$ export ANDROID_NDK_ROOT="/opt/android-ndk"
+$ export PATH="$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH"
+$ CC=aarch64-linux-android32-clang \
+  CPPFLAGS="-I$PWD/../openssl/include" \
+  LDFLAGS="-L$PWD/../openssl" \
+  ./configure \
+      --host=aarch64-linux-android32 \
+      --disable-shared \
+      --enable-static \
+      --enable-cross-thread-connections \
+      --enable-releasemode \
+      --disable-tcl
+$ make -j$(nproc)
+$ ./libtool --mode install install libsqlcipher.la $PWD
+```
+
+### DarkIRC
+
+```
+$ make darkirc.android64
+```