Add xargo example

build.sh

@@ -53,7 +53,8 @@ else
     cargo build
 fi
 
-RUSTC="rustc -Zcodegen-backend=$(pwd)/target/$channel/librustc_codegen_cranelift.$dylib_ext -Cpanic=abort -L crate=target/out --out-dir target/out"
+export RUSTFLAGS='-Zalways-encode-mir -Cpanic=abort -Zcodegen-backend='$(pwd)'/target/'$channel'/librustc_codegen_cranelift.'$dylib_ext
+RUSTC="rustc $RUSTFLAGS -L crate=target/out --out-dir target/out"
 
 rm -r target/out || true
 mkdir -p target/out/clif
@@ -71,5 +72,13 @@ build_example_bin mini_core_hello_world example/mini_core_hello_world.rs
 
 echo "[BUILD] core"
 time $RUSTC target/libcore/src/libcore/lib.rs --crate-type lib --crate-name core -Cincremental=target/incremental_core
+
+pushd xargo
+rm -r ~/.xargo/HOST
+export XARGO_RUST_SRC=$(pwd)'/../target/libcore/src'
+time xargo build --color always
+rm -r target/
+popd
+
 cat target/out/log.txt | sort | uniq -c
 #extract_data libcore.rlib core.o

xargo/Cargo.lock

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

xargo/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "xargo"
+version = "0.1.0"
+authors = ["bjorn3 <bjorn3@users.noreply.github.com>"]
+
+[dependencies]

xargo/Xargo.toml

@@ -0,0 +1,9 @@
+[dependencies]
+core = {}
+
+# Disabled due to bug in current cranelift version, fixed in master
+#alloc = {}
+#alloc_system = {}
+
+# Disabled due to missing support for many things (intrinsics, etc) in rustc_codegen_cranelift
+#std = {features = ["force_alloc_system"]}

xargo/src/lib.rs

@@ -0,0 +1,5 @@
+#![feature(compiler_builtins)]
+
+#![no_std]
+#![compiler_builtins] // Don't link to compiler builtins
+// Just a dummy