Update example run scripts to use platform-dependent shared library name

examples/c++-dataflow/run.rs

@@ -1,5 +1,9 @@
 use eyre::{bail, Context};
-use std::path::Path;
+use std::{
+    env::consts::{DLL_PREFIX, DLL_SUFFIX},
+    ffi::{OsStr, OsString},
+    path::Path,
+};
 
 #[tokio::main]
 async fn main() -> eyre::Result<()> {
@@ -88,7 +92,7 @@ async fn build_cxx_operator(path: &Path, out_name: &str) -> eyre::Result<()> {
     let mut link = tokio::process::Command::new("clang++");
     link.arg("-shared").arg(&object_file_path);
     link.arg("-o")
-        .arg(Path::new("../build").join(format!("lib{out_name}.so")));
+        .arg(Path::new("../build").join(library_filename(out_name)));
     if let Some(parent) = path.parent() {
         link.current_dir(parent);
     }
@@ -98,3 +102,14 @@ async fn build_cxx_operator(path: &Path, out_name: &str) -> eyre::Result<()> {
 
     Ok(())
 }
+
+// taken from `rust_libloading` crate by Simonas Kazlauskas, licensed under the ISC license (
+// see https://github.com/nagisa/rust_libloading/blob/master/LICENSE)
+pub fn library_filename<S: AsRef<OsStr>>(name: S) -> OsString {
+    let name = name.as_ref();
+    let mut string = OsString::with_capacity(name.len() + DLL_PREFIX.len() + DLL_SUFFIX.len());
+    string.push(DLL_PREFIX);
+    string.push(name);
+    string.push(DLL_SUFFIX);
+    string
+}

examples/c-dataflow/run.rs

@@ -1,5 +1,9 @@
 use eyre::{bail, Context};
-use std::path::Path;
+use std::{
+    env::consts::{DLL_PREFIX, DLL_SUFFIX},
+    ffi::{OsStr, OsString},
+    path::Path,
+};
 
 #[tokio::main]
 async fn main() -> eyre::Result<()> {
@@ -79,10 +83,22 @@ async fn build_c_operator(root: &Path) -> eyre::Result<()> {
 
     let mut link = tokio::process::Command::new("clang");
     link.arg("-shared").arg("build/operator.o");
-    link.arg("-o").arg("build/liboperator.so");
+    link.arg("-o")
+        .arg(Path::new("build").join(library_filename("operator")));
     if !link.status().await?.success() {
         bail!("failed to link c operator");
     };
 
     Ok(())
 }
+
+// taken from `rust_libloading` crate by Simonas Kazlauskas, licensed under the ISC license (
+// see https://github.com/nagisa/rust_libloading/blob/master/LICENSE)
+pub fn library_filename<S: AsRef<OsStr>>(name: S) -> OsString {
+    let name = name.as_ref();
+    let mut string = OsString::with_capacity(name.len() + DLL_PREFIX.len() + DLL_SUFFIX.len());
+    string.push(DLL_PREFIX);
+    string.push(name);
+    string.push(DLL_SUFFIX);
+    string
+}