Android cross-compiled command line hello world

`cargo run` Just Works®

.gitignore

@@ -4,6 +4,7 @@
 /.servobuild
 /android-toolchains
 /target
+/support/android/egl-configs/target
 /ports/android/bin
 /ports/android/libs
 /ports/android/local.properties

Cargo.toml

@@ -7,7 +7,7 @@ default-members = [
     "ports/servo",
     "tests/unit/*",
 ]
-exclude = [".cargo"]
+exclude = [".cargo", "support/android/egl-configs"]
 
 [profile.release]
 opt-level = 3

support/android/egl-configs/.cargo/config

@@ -0,0 +1,6 @@
+[build]
+target = "armv7-linux-androideabi"
+
+[target.armv7-linux-androideabi]
+linker = "./ld.sh"
+runner = "./run.sh"

support/android/egl-configs/Cargo.lock

@@ -0,0 +1,4 @@
+[[package]]
+name = "egl-configs"
+version = "0.1.0"
+

support/android/egl-configs/Cargo.toml

@@ -0,0 +1,3 @@
+[package]
+name = "egl-configs"
+version = "0.1.0"

support/android/egl-configs/ld.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+NDK=../../../android-toolchains/android-ndk-r12b-linux-x86_64/android-ndk-r12b
+
+"${NDK}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc" \
+  --sysroot "${NDK}/platforms/android-18/arch-arm" \
+  "$@"

support/android/egl-configs/run.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+path="$1"
+base="$(basename $1)"
+remote_path="/data/local/tmp/$base"
+shift
+
+adb -e wait-for-device
+adb -e push "$path" "$remote_path"
+adb -e shell "$remote_path" "$@"

support/android/egl-configs/src/main.rs

@@ -0,0 +1,6 @@
+fn main() {
+    println!("Hello, world!");
+    for arg in std::env::args() {
+        println!("{}", arg);
+    }
+}