Merge branch 'cross-compiling' into 'next'

Added cross-compilation instructions

See merge request famedly/conduit!430

DEPLOY.md

@@ -49,7 +49,25 @@ $ sudo apt install libclang-dev build-essential
 $ cargo build --release
 ```
 
-If you want to cross compile Conduit to another architecture, read the [Cross-Compile Guide](cross/README.md).
+If you want to cross compile Conduit to another architecture, read the guide below.
+
+<details>
+<summary>Cross compilation</summary>
+
+As easiest way to compile conduit for another platform [cross-rs](https://github.com/cross-rs/cross) is recommended, so install it first.
+
+In order to use RockDB as storage backend append `-latomic` to linker flags.
+
+For example, to build a binary for Raspberry Pi Zero W (ARMv6) you need `arm-unknown-linux-gnueabihf` as compilation
+target.
+
+```bash
+git clone https://gitlab.com/famedly/conduit.git
+cd conduit
+export RUSTFLAGS='-C link-arg=-lgcc -Clink-arg=-latomic -Clink-arg=-static-libgcc'
+cross build --release --no-default-features --features conduit_bin,backend_rocksdb,jemalloc --target=arm-unknown-linux-gnueabihf
+```
+</details>
 
 ## Adding a Conduit user