Switch 'deny' lints to 'warn' to simplify local development. Warnings will be caught by clippy regardless in CI (#679)

Signed-off-by: Ludvig Liljenberg <[email protected]>

Author: ludfjig

src/hyperlight_host/src/lib.rs

@@ -13,7 +13,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-#![deny(dead_code, missing_docs, unused_mut)]
+#![warn(dead_code, missing_docs, unused_mut)]
 //! This crate contains an SDK that is used to execute specially-
 // compiled binaries within a very lightweight hypervisor environment.
 

src/hyperlight_host/src/sandbox/hypervisor.rs

@@ -77,3 +77,9 @@ pub(crate) enum HypervisorType {
     #[cfg(target_os = "windows")]
     Whp,
 }
+
+// Compiler error if no hypervisor type is available
+#[cfg(not(any(kvm, mshv, target_os = "windows")))]
+compile_error!(
+    "No hypervisor type is available for the current platform. Please enable either the `kvm` or `mshv` cargo feature."
+);