Only use substrate-wasm-builder when std feature is enabled. (#12790)

Co-authored-by: parity-processbot <>

substrate/test-utils/runtime/Cargo.toml

@@ -59,7 +59,7 @@ substrate-test-runtime-client = { version = "2.0.0", path = "./client" }
 futures = "0.3.21"
 
 [build-dependencies]
-substrate-wasm-builder = { version = "5.0.0-dev", path = "../../utils/wasm-builder" }
+substrate-wasm-builder = { version = "5.0.0-dev", path = "../../utils/wasm-builder", optional = true }
 
 [features]
 default = [
@@ -101,6 +101,7 @@ std = [
 	"sp-trie/std",
 	"sp-transaction-pool/std",
 	"trie-db/std",
+	"substrate-wasm-builder",
 ]
 # Special feature to disable logging
 disable-logging = [ "sp-api/disable-logging" ]

substrate/test-utils/runtime/build.rs

@@ -15,24 +15,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use substrate_wasm_builder::WasmBuilder;
-
 fn main() {
-	WasmBuilder::new()
-		.with_current_project()
-		.export_heap_base()
-		// Note that we set the stack-size to 1MB explicitly even though it is set
-		// to this value by default. This is because some of our tests (`restoration_of_globals`)
-		// depend on the stack-size.
-		.append_to_rust_flags("-Clink-arg=-zstack-size=1048576")
-		.import_memory()
-		.build();
+	#[cfg(feature = "std")]
+	{
+		substrate_wasm_builder::WasmBuilder::new()
+			.with_current_project()
+			.export_heap_base()
+			// Note that we set the stack-size to 1MB explicitly even though it is set
+			// to this value by default. This is because some of our tests
+			// (`restoration_of_globals`) depend on the stack-size.
+			.append_to_rust_flags("-Clink-arg=-zstack-size=1048576")
+			.import_memory()
+			.build();
+	}
 
-	WasmBuilder::new()
-		.with_current_project()
-		.export_heap_base()
-		.import_memory()
-		.set_file_name("wasm_binary_logging_disabled.rs")
-		.enable_feature("disable-logging")
-		.build();
+	#[cfg(feature = "std")]
+	{
+		substrate_wasm_builder::WasmBuilder::new()
+			.with_current_project()
+			.export_heap_base()
+			.import_memory()
+			.set_file_name("wasm_binary_logging_disabled.rs")
+			.enable_feature("disable-logging")
+			.build();
+	}
 }