Add Windows wasm3 build

scripts/build_runtime.py

@@ -27,6 +27,7 @@ def build_runtime(args):
     ensure_angle()
 
     build_milepost("lib", args.release)
+    build_wasm3(args.release)
 
 
 def build_milepost(target, release):
@@ -180,6 +181,38 @@ def build_milepost_lib_mac(release):
     ], check=True)
 
 
+def build_wasm3(release):
+    print("Building wasm3...")
+
+    os.makedirs("bin", exist_ok=True)
+    os.makedirs("bin\\obj", exist_ok=True)
+
+    if platform.system() == "Windows":
+        build_wasm3_lib_win(release)
+    elif platform.system() == "Darwin":
+        raise "can't yet build wasm3 on Mac"
+    else:
+        log_error(f"can't build wasm3 for unknown platform '{platform.system()}'")
+        exit(1)
+
+
+def build_wasm3_lib_win(release):
+    for f in glob.iglob(".\\ext\\wasm3\\source\\*.c"):
+        name = os.path.splitext(os.path.basename(f))[0]
+        subprocess.run([
+            "cl", "/nologo",
+            "/Zi", "/Zc:preprocessor", "/c",
+            *(["/O2"] if release else []),
+            f"/Fo:bin\\obj\\{name}.obj",
+            "/I", ".\\ext\\wasm3\\source",
+            f,
+        ], check=True)
+    subprocess.run([
+        "lib", "/nologo", "/out:bin\\wasm3.lib",
+        "bin\\obj\\*.obj",
+    ], check=True)
+
+
 def ensure_programs():
     if platform.system() == "Windows":
         try: