Initial commit

Author: maxbrunsfeld

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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+[package]
+name = "wasm-crate-with-c"
+version = "0.1.0"
+authors = ["Max Brunsfeld <maxbrunsfeld@gmail.com>"]
+edition = "2018"
+
+[lib]
+name = "wasm_lib_with_c"
+path = "src/lib.rs"
+crate-type = ["staticlib"]
+
+[build-dependencies]
+cc = "1.0"

Cargo.toml

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+extern crate cc;
+
+fn main() {
+    let mut config = cc::Build::new();
+    config
+        .file("src/lib.c")
+        .compile("wasm-lib-with-c");
+}

build.rs

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+#include <stdint.h>
+
+uint32_t increment_in_c(uint32_t i) {
+  return i + 1;
+}

src/lib.c

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+extern "C" {
+    #[no_mangle]
+    fn increment_in_c(i: u32) -> u32;
+}
+
+#[no_mangle]
+extern "C" fn increment_in_rust(i: u32) -> u32 {
+    unsafe { increment_in_c(i) }
+}