Allow building for wasm32-wasi target using Bazel. (proxy-wasm#50)

While there, update Bazel to 3.7.0.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

.bazelrc

@@ -1,2 +1,2 @@
-# Force Bazel to use --target=wasm32-unknown-unknown.
-build --platforms=@io_bazel_rules_rust//rust/platform:wasm
+# Force Bazel to use --target=wasm32-wasi
+build --platforms=@io_bazel_rules_rust//rust/platform:wasi

.bazelversion

@@ -1 +1 @@
-3.4.1
+3.7.0

.github/workflows/rust.yml

@@ -59,8 +59,11 @@ jobs:
           ~/.cargo/registry
         key: ${{ hashFiles('WORKSPACE', '.bazelrc', '.bazelversion', 'bazel/cargo/Cargo.lock') }}
 
-    - name: Build
-      run: bazelisk build //...
+    - name: Build (wasm32-unknown-unknown)
+      run: bazelisk --bazelrc=/dev/null build --platforms=@io_bazel_rules_rust//rust/platform:wasm //...
+
+    - name: Build (wasm32-wasi)
+      run: bazelisk --bazelrc=/dev/null build --platforms=@io_bazel_rules_rust//rust/platform:wasi //...
 
     - name: Format (buildifier)
       run: |

Cargo.toml

@@ -28,6 +28,17 @@ panic = "abort"
 workspace_path = "//bazel/cargo"
 genmode = "Remote"
 
+[package.metadata.raze.crates.libc.'0.2.80']
+additional_flags = [
+  "--cfg=libc_priv_mod_use",
+  "--cfg=libc_union",
+  "--cfg=libc_const_size_of",
+  "--cfg=libc_align",
+  "--cfg=libc_core_cvoid",
+  "--cfg=libc_packedN",
+  "--cfg=libc_cfg_target_vendor",
+]
+
 [package.metadata.raze.crates.log.'0.4.11']
 additional_flags = ["--cfg=atomic_cas"]
 

bazel/cargo/remote/BUILD.libc-0.2.80.bazel

@@ -44,6 +44,13 @@ rust_library(
     edition = "2015",
     rustc_flags = [
         "--cap-lints=allow",
+        "--cfg=libc_priv_mod_use",
+        "--cfg=libc_union",
+        "--cfg=libc_const_size_of",
+        "--cfg=libc_align",
+        "--cfg=libc_core_cvoid",
+        "--cfg=libc_packedN",
+        "--cfg=libc_cfg_target_vendor",
     ],
     tags = [
         "cargo-raze",