From 3fc5c7a8f583e10361ac641a37dec9948c4762d9 Mon Sep 17 00:00:00 2001
From: Ralf Anton Beier <ralf_beier@me.com>
Date: Sun, 11 Jan 2026 17:53:57 +0100
Subject: [PATCH] feat: add C/C++ CLI hello world examples

Add runnable WASI CLI components for C and C++ using cpp_wasm_binary rule:
- c/src/main.c -> hello_c_cli.wasm
- cpp/src/main.cpp -> hello_cpp_cli.wasm

These can be executed directly with `wasmtime run`, unlike the existing
library components (hello_c_debug/release, hello_cpp_debug/release) which
export interfaces for composition.

Also bumps version to 0.2.0 and updates release notes.
---
 .github/workflows/release.yml | 14 ++++++++++----
 MODULE.bazel                  |  2 +-
 c/BUILD.bazel                 | 10 +++++++++-
 c/src/main.c                  | 12 ++++++++++++
 cpp/BUILD.bazel               | 10 +++++++++-
 cpp/src/main.cpp              | 12 ++++++++++++
 6 files changed, 53 insertions(+), 7 deletions(-)
 create mode 100644 c/src/main.c
 create mode 100644 cpp/src/main.cpp

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7bf207f..b5d85b0 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -193,12 +193,14 @@ jobs:
           ### Components Included
 
           **C Components:**
-          - `hello_c_debug.wasm` - Debug build
-          - `hello_c_release.wasm` - Release build (optimized)
+          - `hello_c_cli.wasm` - CLI executable (runs with wasmtime)
+          - `hello_c_debug.wasm` - Library component (debug)
+          - `hello_c_release.wasm` - Library component (release)
 
           **C++ Components:**
-          - `hello_cpp_debug.wasm` - Debug build
-          - `hello_cpp_release.wasm` - Release build (optimized)
+          - `hello_cpp_cli.wasm` - CLI executable (runs with wasmtime)
+          - `hello_cpp_debug.wasm` - Library component (debug)
+          - `hello_cpp_release.wasm` - Library component (release)
 
           **Rust Components:**
           - `hello_rust.wasm` - Hello World CLI
@@ -220,6 +222,10 @@ jobs:
           # Install wasmtime
           curl https://wasmtime.dev/install.sh -sSf | bash
 
+          # Run C/C++ CLI examples
+          wasmtime run hello_c_cli.wasm
+          wasmtime run hello_cpp_cli.wasm
+
           # Run Rust CLI examples
           wasmtime run hello_rust.wasm
           wasmtime run calculator.wasm 8 + 8
diff --git a/MODULE.bazel b/MODULE.bazel
index 367fd18..e762a04 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -6,7 +6,7 @@ pulseengine/rules_wasm_component.
 
 module(
     name = "hello_wasm_components",
-    version = "0.1.0",
+    version = "0.2.0",
 )
 
 # Core dependency - WebAssembly Component Model rules
diff --git a/c/BUILD.bazel b/c/BUILD.bazel
index 95fb2b5..ee6cddc 100644
--- a/c/BUILD.bazel
+++ b/c/BUILD.bazel
@@ -3,7 +3,7 @@
 Demonstrates building a C WASI component with debug and release variants.
 """
 
-load("@rules_wasm_component//cpp:defs.bzl", "cpp_component")
+load("@rules_wasm_component//cpp:defs.bzl", "cpp_component", "cpp_wasm_binary")
 load("@rules_wasm_component//wit:defs.bzl", "wit_library")
 
 package(default_visibility = ["//visibility:public"])
@@ -44,10 +44,18 @@ alias(
     actual = ":hello_c_release",
 )
 
+# CLI binary (runs directly with wasmtime)
+cpp_wasm_binary(
+    name = "hello_c_cli",
+    srcs = ["src/main.c"],
+    language = "c",
+)
+
 # All variants
 filegroup(
     name = "all",
     srcs = [
+        ":hello_c_cli",
         ":hello_c_debug",
         ":hello_c_release",
     ],
diff --git a/c/src/main.c b/c/src/main.c
new file mode 100644
index 0000000..1b95807
--- /dev/null
+++ b/c/src/main.c
@@ -0,0 +1,12 @@
+/**
+ * Hello World WASI CLI in C
+ *
+ * Simple main() that prints to stdout - runs directly with wasmtime.
+ */
+
+#include <stdio.h>
+
+int main(void) {
+    printf("Hello wasm component world from C!\n");
+    return 0;
+}
diff --git a/cpp/BUILD.bazel b/cpp/BUILD.bazel
index b603e8e..89e6fe8 100644
--- a/cpp/BUILD.bazel
+++ b/cpp/BUILD.bazel
@@ -3,7 +3,7 @@
 Demonstrates building a C++ WASI component with debug and release variants.
 """
 
-load("@rules_wasm_component//cpp:defs.bzl", "cpp_component")
+load("@rules_wasm_component//cpp:defs.bzl", "cpp_component", "cpp_wasm_binary")
 load("@rules_wasm_component//wit:defs.bzl", "wit_library")
 
 package(default_visibility = ["//visibility:public"])
@@ -50,10 +50,18 @@ alias(
     actual = ":hello_cpp_release",
 )
 
+# CLI binary (runs directly with wasmtime)
+cpp_wasm_binary(
+    name = "hello_cpp_cli",
+    srcs = ["src/main.cpp"],
+    language = "cpp",
+)
+
 # All variants
 filegroup(
     name = "all",
     srcs = [
+        ":hello_cpp_cli",
         ":hello_cpp_debug",
         ":hello_cpp_release",
     ],
diff --git a/cpp/src/main.cpp b/cpp/src/main.cpp
new file mode 100644
index 0000000..625d70f
--- /dev/null
+++ b/cpp/src/main.cpp
@@ -0,0 +1,12 @@
+/**
+ * Hello World WASI CLI in C++
+ *
+ * Simple main() that prints to stdout - runs directly with wasmtime.
+ */
+
+#include <cstdio>
+
+int main() {
+    printf("Hello wasm component world from C++!\n");
+    return 0;
+}