Actually print out the cargo messages

build.rs

@@ -265,10 +265,10 @@ fn add(builder: &mut Builder<impl Write>, root: &Path, path: &Path) -> Result<()
 fn maybe_make_cpython(repo_dir: &Path, wasi_sdk: &Path) -> Result<()> {
     let cpython_wasi_dir = repo_dir.join("cpython/builddir/wasi");
     if !cpython_wasi_dir.join("libpython3.12.so").exists() {
-        println!("building libpython3.12.so");
+        println!("cargo:warning=building libpython3.12.so");
 
         if !cpython_wasi_dir.join("libpython3.12.a").exists() {
-            println!("building libpython3.12.a");
+            println!("cargo:warning=building libpython3.12.a");
             let cpython_native_dir = repo_dir.join("cpython/builddir/build");
             if !cpython_native_dir.join(PYTHON_EXECUTABLE).exists() {
                 fs::create_dir_all(&cpython_native_dir)?;
@@ -309,7 +309,7 @@ fn maybe_make_cpython(repo_dir: &Path, wasi_sdk: &Path) -> Result<()> {
                 .current_dir(&cpython_wasi_dir)
                 .arg("install"))?;
         } else {
-            println!("using existing libpython3.12.a");
+            println!("cargo:warning=using existing libpython3.12.a");
         }
 
         run(Command::new(wasi_sdk.join("bin/clang"))
@@ -324,7 +324,7 @@ fn maybe_make_cpython(repo_dir: &Path, wasi_sdk: &Path) -> Result<()> {
             .arg(cpython_wasi_dir.join("Modules/_decimal/libmpdec/libmpdec.a"))
             .arg(cpython_wasi_dir.join("Modules/expat/libexpat.a")))?;
     } else {
-        println!("using existing libpython3.12.so");
+        println!("cargo:warning=using existing libpython3.12.so");
     }
 
     Ok(())