Compile polkadot-runtime both for Wasm ad native, allowing for testing and direct usage.

substrate/wasm-runtime/pwasm-libc/Cargo.toml

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+[package]
+name = "pwasm-libc"
+version = "0.1.0"
+authors = ["Sergey Pepyakin <s.pepyakin@gmail.com>"]
+license = "MIT/Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/paritytech/pwasm-std"
+homepage = "https://github.com/paritytech/pwasm-std"
+documentation = "https://paritytech.github.io/pwasm-std/pwasm_std/"
+description = "Parity WebAssembly standard library libc bindings"
+keywords = ["wasm", "parity", "webassembly", "blockchain"]
+categories = ["no-std", "embedded"]
+
+[features]
+strict = []

substrate/wasm-runtime/pwasm-libc/README.md

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+# pwasm-libc
+
+Parity WASM contracts standard library libc bindings
+
+[Documentation](https://paritytech.github.io/pwasm-std/pwasm_libc/)
+
+# License
+
+`pwasm-libc` is primarily distributed under the terms of both the MIT
+license and the Apache License (Version 2.0), at your choice.
+
+See LICENSE-APACHE, and LICENSE-MIT for details.

substrate/wasm-runtime/pwasm-libc/src/lib.rs

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+#![warn(missing_docs)]
+#![cfg_attr(feature = "strict", deny(warnings))]
+#![no_std]
+
+//! libc externs crate
+
+extern "C" {
+	fn ext_memcpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
+	fn ext_memmove(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
+	fn ext_memset(dest: *mut u8, c: i32, n: usize) -> *mut u8;
+	fn ext_malloc(size: usize) -> *mut u8;
+	fn ext_free(ptr: *mut u8);
+}
+
+// Declaring these function here prevents Emscripten from including it's own verisons
+// into final binary.
+
+/// memcpy extern
+#[no_mangle]
+pub unsafe extern "C" fn memcpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8 {
+	ext_memcpy(dest, src, n)
+}
+
+/// memmove extern
+#[no_mangle]
+pub unsafe extern "C" fn memmove(dest: *mut u8, src: *const u8, n: usize) -> *mut u8 {
+	ext_memmove(dest, src, n)
+}
+
+/// memset extern
+#[no_mangle]
+pub unsafe extern "C" fn memset(dest: *mut u8, c: i32, n: usize) -> *mut u8 {
+	ext_memset(dest, c, n)
+}
+
+/// malloc extern
+#[no_mangle]
+pub unsafe extern "C" fn malloc(size: usize) -> *mut u8 {
+	ext_malloc(size)
+}
+
+/// free extern
+#[no_mangle]
+pub unsafe extern "C" fn free(ptr: *mut u8) {
+	ext_free(ptr);
+}