Some fixes to compile for Android

parachain/Cargo.toml

@@ -24,7 +24,7 @@ sp-io = { git = "https://github.com/paritytech/substrate", branch = "master", op
 parking_lot = { version = "0.10.0", optional = true }
 log = { version = "0.4.8", optional = true }
 
-[target.'cfg(not(target_os = "unknown"))'.dependencies]
+[target.'cfg(not(any(target_os = "android", target_os = "unknown")))'.dependencies]
 shared_memory = { version = "0.10.0", optional = true }
 
 [features]

parachain/src/wasm_executor/mod.rs

@@ -28,7 +28,7 @@ use sp_core::traits::CallInWasm;
 use sp_wasm_interface::HostFunctions as _;
 use sp_externalities::Extensions;
 
-#[cfg(not(target_os = "unknown"))]
+#[cfg(not(any(target_os = "android", target_os = "unknown")))]
 pub use validation_host::{run_worker, ValidationPool, EXECUTION_TIMEOUT_SEC};
 
 mod validation_host;
@@ -49,21 +49,27 @@ impl ParachainExt {
 	}
 }
 
-/// A stub validation-pool defined when compiling for WASM.
-#[cfg(target_os = "unknown")]
+/// A stub validation-pool defined when compiling for Android or WASM.
+#[cfg(any(target_os = "android", target_os = "unknown"))]
 #[derive(Clone)]
 pub struct ValidationPool {
 	_inner: (), // private field means not publicly-instantiable
 }
 
-#[cfg(target_os = "unknown")]
+#[cfg(any(target_os = "android", target_os = "unknown"))]
 impl ValidationPool {
 	/// Create a new `ValidationPool`.
 	pub fn new() -> Self {
 		ValidationPool { _inner: () }
 	}
 }
 
+/// A stub function defined when compiling for Android or WASM.
+#[cfg(any(target_os = "android", target_os = "unknown"))]
+pub fn run_worker(_: &str) -> Result<(), String> {
+	Err("Cannot run validation worker on this platform".to_string())
+}
+
 /// WASM code execution mode.
 ///
 /// > Note: When compiling for WASM, the `Remote` variants are not available.
@@ -101,7 +107,7 @@ pub enum Error {
 	#[display(fmt = "WASM worker error: {}", _0)]
 	External(String),
 	#[display(fmt = "Shared memory error: {}", _0)]
-	#[cfg(not(target_os = "unknown"))]
+	#[cfg(not(any(target_os = "android", target_os = "unknown")))]
 	SharedMem(shared_memory::SharedMemError),
 }
 
@@ -111,7 +117,7 @@ impl std::error::Error for Error {
 			Error::WasmExecutor(ref err) => Some(err),
 			Error::Io(ref err) => Some(err),
 			Error::System(ref err) => Some(&**err),
-			#[cfg(not(target_os = "unknown"))]
+			#[cfg(not(any(target_os = "android", target_os = "unknown")))]
 			Error::SharedMem(ref err) => Some(err),
 			_ => None,
 		}
@@ -137,20 +143,20 @@ pub fn validate_candidate<E: Externalities + 'static>(
 		ExecutionMode::Local => {
 			validate_candidate_internal(validation_code, &params.encode(), ext)
 		},
-		#[cfg(not(target_os = "unknown"))]
+		#[cfg(not(any(target_os = "android", target_os = "unknown")))]
 		ExecutionMode::Remote(pool) => {
 			pool.validate_candidate(validation_code, params, ext, false)
 		},
-		#[cfg(not(target_os = "unknown"))]
+		#[cfg(not(any(target_os = "android", target_os = "unknown")))]
 		ExecutionMode::RemoteTest(pool) => {
 			pool.validate_candidate(validation_code, params, ext, true)
 		},
-		#[cfg(target_os = "unknown")]
+		#[cfg(any(target_os = "android", target_os = "unknown"))]
 		ExecutionMode::Remote(pool) =>
 			Err(Error::System(Box::<dyn std::error::Error + Send + Sync>::from(
 				"Remote validator not available".to_string()
 			) as Box<_>)),
-		#[cfg(target_os = "unknown")]
+		#[cfg(any(target_os = "android", target_os = "unknown"))]
 		ExecutionMode::RemoteTest(pool) =>
 			Err(Error::System(Box::<dyn std::error::Error + Send + Sync>::from(
 				"Remote validator not available".to_string()

parachain/src/wasm_executor/validation_host.rs

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
-#![cfg(not(target_os = "unknown"))]
+#![cfg(not(any(target_os = "android", target_os = "unknown")))]
 
 use std::{process, env, sync::Arc, sync::atomic, mem};
 use codec::{Decode, Encode, EncodeAppend};

service/src/lib.rs

@@ -45,7 +45,7 @@ pub use polkadot_primitives::parachain::{CollatorId, ParachainHost};
 pub use polkadot_primitives::Block;
 pub use sp_runtime::traits::{Block as BlockT, self as runtime_traits, BlakeTwo256};
 pub use chain_spec::{PolkadotChainSpec, KusamaChainSpec, WestendChainSpec};
-#[cfg(not(target_os = "unknown"))]
+#[cfg(feature = "full-node")]
 pub use consensus::run_validation_worker;
 pub use codec::Codec;
 pub use polkadot_runtime;

validation/src/lib.rs

@@ -53,7 +53,6 @@ pub use self::shared_table::{
 };
 pub use self::validation_service::{ServiceHandle, ServiceBuilder};
 
-#[cfg(not(target_os = "unknown"))]
 pub use parachain::wasm_executor::run_worker as run_validation_worker;
 
 mod dynamic_inclusion;