Add cg_clif as optional codegen backend

Cargo.toml

@@ -31,6 +31,7 @@ members = [
 ]
 exclude = [
   "build",
+  "compiler/rustc_codegen_cranelift",
   # HACK(eddyb) This hardcodes the fact that our CI uses `/checkout/obj`.
   "obj",
 ]

compiler/rustc_codegen_cranelift/.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

compiler/rustc_codegen_cranelift/.github/workflows/main.yml

@@ -0,0 +1,54 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Cache cargo installed crates
+      uses: actions/cache@v2
+      with:
+        path: ~/.cargo/bin
+        key: ${{ runner.os }}-cargo-installed-crates
+
+    - name: Cache cargo registry and index
+      uses: actions/cache@v2
+      with:
+        path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+        key: ${{ runner.os }}-cargo-registry-and-index-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo target dir
+      uses: actions/cache@v2
+      with:
+        path: target
+        key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('rust-toolchain', '**/Cargo.lock') }}
+
+    - name: Prepare dependencies
+      run: |
+        git config --global user.email "user@example.com"
+        git config --global user.name "User"
+        ./prepare.sh
+
+    - name: Test
+      run: |
+        # Enable backtraces for easier debugging
+        export RUST_BACKTRACE=1
+
+        # Reduce amount of benchmark runs as they are slow
+        export COMPILE_RUNS=2
+        export RUN_RUNS=2
+
+        ./test.sh --release

compiler/rustc_codegen_cranelift/.gitignore

@@ -0,0 +1,14 @@
+target
+**/*.rs.bk
+*.rlib
+*.o
+perf.data
+perf.data.old
+*.events
+*.string*
+/build_sysroot/sysroot
+/build_sysroot/sysroot_src
+/rust
+/rand
+/regex
+/simple-raytracer

compiler/rustc_codegen_cranelift/.vscode/settings.json

@@ -0,0 +1,53 @@
+{
+    // source for rustc_* is not included in the rust-src component; disable the errors about this
+    "rust-analyzer.diagnostics.disabled": ["unresolved-extern-crate"],
+    "rust-analyzer.cargo.loadOutDirsFromCheck": true,
+    "rust-analyzer.linkedProjects": [
+        "./Cargo.toml",
+        //"./build_sysroot/sysroot_src/src/libstd/Cargo.toml",
+        {
+            "roots": [
+                "./example/mini_core.rs",
+                "./example/mini_core_hello_world.rs",
+                "./example/mod_bench.rs"
+            ],
+            "crates": [
+                {
+                    "root_module": "./example/mini_core.rs",
+                    "edition": "2018",
+                    "deps": [],
+                    "cfg": [],
+                },
+                {
+                    "root_module": "./example/mini_core_hello_world.rs",
+                    "edition": "2018",
+                    "deps": [{ "crate": 0, "name": "mini_core" }],
+                    "cfg": [],
+                },
+                {
+                    "root_module": "./example/mod_bench.rs",
+                    "edition": "2018",
+                    "deps": [],
+                    "cfg": [],
+                },
+            ]
+        },
+        {
+            "roots": ["./scripts/filter_profile.rs"],
+            "crates": [
+                {
+                    "root_module": "./scripts/filter_profile.rs",
+                    "edition": "2018",
+                    "deps": [{ "crate": 1, "name": "std" }],
+                    "cfg": [],
+                },
+                {
+                    "root_module": "./build_sysroot/sysroot_src/library/std/src/lib.rs",
+                    "edition": "2018",
+                    "deps": [],
+                    "cfg": [],
+                },
+            ]
+        }
+    ]
+}