User RC compiler for MSVC toolchains

build.rs

@@ -29,14 +29,27 @@ fn build_resource() -> Result<()> {
         )?;
         let output = std::path::PathBuf::from(&output_dir).join("resource.o");
         #[allow(clippy::option_env_unwrap)]
-        let status = std::process::Command::new(
-            option_env!("WINDRES").expect("WINDRES envvar is undefined"),
-        )
-        .arg("-I")
-        .arg(&output_dir)
-        .arg("res/resource.rc")
-        .arg(&output)
-        .status()?;
+        let status = if let Some(windres) = option_env!("WINDRES") {
+            std::process::Command::new(windres)
+                .arg("-I")
+                .arg(&output_dir)
+                .arg("res/resource.rc")
+                .arg(&output)
+                .status()?
+        } else if let Some(rc) = option_env!("RC") {
+            std::process::Command::new(rc)
+                .arg("/i")
+                .arg(&output_dir)
+                .arg("/fo")
+                .arg(&output)
+                .arg("res/resource.rc")
+                .status()?
+        } else {
+            return Err(std::io::Error::new(
+                std::io::ErrorKind::Other,
+                "RC or WINDRES should be defined",
+            ));
+        };
         if !status.success() {
             return Err(std::io::Error::new(
                 std::io::ErrorKind::Other,