feat: add a histrical wit-bindgen

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-c/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "wit-bindgen-gen-c"
+version = "0.1.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
+
+[lib]
+doctest = false
+test = false
+
+[dependencies]
+wit-bindgen-gen-core = { path = '../gen-core', version = '0.1.0' }
+heck = "0.3"
+structopt = { version = "0.3", default-features = false, optional = true }
+
+[dev-dependencies]
+test-helpers = { path = '../test-helpers', features = ['wit-bindgen-gen-c'] }

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-c/build.rs

@@ -0,0 +1,4 @@
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    // this build script is currently only here so OUT_DIR is set for testing.
+}

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-c/tests/codegen.rs

@@ -0,0 +1,58 @@
+use std::env;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+mod imports {
+    test_helpers::codegen_c_import!(
+        // ...
+        "*.wit"
+
+        // TODO: implement async support
+        "!async-functions.wit"
+    );
+}
+
+mod exports {
+    test_helpers::codegen_c_export!(
+        "*.wit"
+
+        // TODO: implement async support
+        "!async-functions.wit"
+
+        // TODO: these use push/pull buffer in exports which isn't implemented
+        // yet
+        "!wasi-next.wit"
+        "!host.wit"
+    );
+}
+
+fn verify(dir: &str, name: &str) {
+    let dir = Path::new(dir);
+    let path = PathBuf::from(env::var_os("WASI_SDK_PATH").unwrap());
+    let mut cmd = Command::new(path.join("bin/clang"));
+    cmd.arg("--sysroot").arg(path.join("share/wasi-sysroot"));
+    cmd.arg(dir.join(format!("{}.c", name)));
+    cmd.arg("-I").arg(dir);
+    cmd.arg("-Wall")
+        .arg("-Wextra")
+        .arg("-Werror")
+        .arg("-Wno-unused-parameter");
+    cmd.arg("-c");
+    cmd.arg("-o").arg(dir.join("obj.o"));
+
+    println!("{:?}", cmd);
+    let output = match cmd.output() {
+        Ok(output) => output,
+        Err(e) => panic!("failed to spawn compiler: {}", e),
+    };
+
+    if output.status.success() {
+        return;
+    }
+    println!("status: {}", output.status);
+    println!("stdout: ------------------------------------------");
+    println!("{}", String::from_utf8_lossy(&output.stdout));
+    println!("stderr: ------------------------------------------");
+    println!("{}", String::from_utf8_lossy(&output.stderr));
+    panic!("failed to compile");
+}