Companion of paritytech/cumulus#2308

Author: aurexav

runtime/crab/build.rs

@@ -19,6 +19,10 @@
 // crates.io
 use substrate_wasm_builder::WasmBuilder;
 
+#[cfg(feature = "std")]
 fn main() {
 	WasmBuilder::new().with_current_project().export_heap_base().import_memory().build()
 }
+
+#[cfg(not(feature = "std"))]
+fn main() {}

runtime/darwinia/build.rs

@@ -19,6 +19,10 @@
 // crates.io
 use substrate_wasm_builder::WasmBuilder;
 
+#[cfg(feature = "std")]
 fn main() {
 	WasmBuilder::new().with_current_project().export_heap_base().import_memory().build()
 }
+
+#[cfg(not(feature = "std"))]
+fn main() {}

runtime/pangolin/build.rs

@@ -19,6 +19,10 @@
 // crates.io
 use substrate_wasm_builder::WasmBuilder;
 
+#[cfg(feature = "std")]
 fn main() {
 	WasmBuilder::new().with_current_project().export_heap_base().import_memory().build()
 }
+
+#[cfg(not(feature = "std"))]
+fn main() {}

runtime/pangoro/build.rs

@@ -19,6 +19,10 @@
 // crates.io
 use substrate_wasm_builder::WasmBuilder;
 
+#[cfg(feature = "std")]
 fn main() {
 	WasmBuilder::new().with_current_project().export_heap_base().import_memory().build()
 }
+
+#[cfg(not(feature = "std"))]
+fn main() {}