add a script to run everything locally

ci/run-all.sh

+# This is **not** meant to be run on CI, but rather locally instead. If you're
+# on a Linux machine you'll be able to run most of these, but otherwise this'll
+# just attempt to run as many platforms as possible!
+
+run() {
+    _target=$1
+    _cc=$2
+    if [ "$_cc" != "" ]; then
+        which $_cc > /dev/null
+        if [ $? -ne 0 ]; then
+           echo "$_cc not installed, skipping $_target"
+           return
+        fi
+        export CC=$_cc
+    fi
+    if [ ! -d .cargo ]; then
+        mkdir .cargo
+        cp ci/cargo-config .cargo/config
+    fi
+    sh ci/run.sh $_target
+}
+
+OS=`uname`
+if [ "$OS" = "Linux" ]; then
+    # For more info on where to get all these cross compilers see
+    # ci/run-travis.sh and what packages are needed on ubuntu
+    run x86_64-unknown-linux-gnu clang
+    run i686-unknown-linux-gnu clang
+    run x86_64-unknown-linux-musl musl-gcc
+    run mips-unknown-linux-gnu mips-linux-gnu-gcc
+    run aarch64-unknown-linux-gnu aarch64-linux-gnueabihf-gcc
+    run arm-unknown-linux-gnueabihf arm-linux-gnueabihf-gcc-4.7
+
+    # Prep for this by running `vagrant up freebsd` in the `ci` directory
+    (cd ci && vagrant ssh freebsd -c \
+        "cd /vagrant && sh ci/run.sh x86_64-unknown-freebsd")
+
+    # Make sure you've run `docker pull alexcrichton/rust-libc-test` to get
+    # this image ahead of time.
+    docker run -itv `pwd`:/clone alexcrichton/rust-libc-test \
+        sh ci/run.sh arm-linux-androideabi
+elif [ "$OS" = "Darwin" ]; then
+    cargo run --target x86_64-unknown-linux-gnu
+    cargo run --target i686-unknown-linux-gnu
+fi