Test basic DWARF generation (#931)

* Add obj generation with debug info
* Add simple transform check

.github/actions/define-dwarfdump-env/README.md

@@ -0,0 +1,3 @@
+# define-dwarfdump-env
+
+Defines `DWARFDUMP` path executable.

.github/actions/define-dwarfdump-env/action.yml

@@ -0,0 +1,6 @@
+name: 'Set up a DWARFDUMP env'
+description: 'Set up a DWARFDUMP env (see tests/debug/dump.rs)'
+
+runs:
+  using: node12
+  main: 'main.js'

.github/actions/define-dwarfdump-env/main.js

@@ -0,0 +1,11 @@
+#!/usr/bin/env node
+
+// On OSX pointing to brew's LLVM location.
+if (process.platform == 'darwin') {
+  console.log("::set-env name=DWARFDUMP::/usr/local/opt/llvm/bin/llvm-dwarfdump");
+}
+
+// On Linux pointing to specific version
+if (process.platform == 'linux') {
+  console.log("::set-env name=DWARFDUMP::/usr/bin/llvm-dwarfdump-9");
+}

.github/workflows/main.yml

@@ -149,6 +149,7 @@ jobs:
     - uses: ./.github/actions/install-rust
       with:
         toolchain: ${{ matrix.rust }}
+    - uses: ./.github/actions/define-dwarfdump-env
 
     - name: Install libclang
       # Note: libclang is pre-installed on the macOS and linux images.
@@ -327,7 +328,7 @@ jobs:
     - run: $CENTOS cargo build --release --manifest-path crates/c-api/Cargo.toml
       shell: bash
     # Test what we just built
-    - run: $CENTOS cargo test --features test_programs --release --all --exclude lightbeam --exclude wasmtime --exclude wasmtime-c-api --exclude wasmtime-fuzzing
+    - run: $CENTOS cargo test --features test_programs --release --all --exclude lightbeam --exclude wasmtime --exclude wasmtime-c-api --exclude wasmtime-fuzzing -- --skip test_debug_dwarf_
       shell: bash
       env:
         RUST_BACKTRACE: 1