blueprint: Add compilation error handling

gtk4-macros/src/blueprint.rs

@@ -1,6 +1,6 @@
 // Take a look at the license at the top of the repository in the LICENSE file.
 
-use anyhow::Result;
+use anyhow::{bail, Result};
 use std::io::{Read, Write};
 use std::process::{Command, Stdio};
 
@@ -20,5 +20,9 @@ pub(crate) fn compile_blueprint(blueprint: &[u8]) -> Result<String> {
     let mut buf = String::new();
     compiler.stdout.unwrap().read_to_string(&mut buf)?;
 
+    if !buf.starts_with("<") {
+        bail!(buf);
+    }
+
     Ok(buf)
 }

gtk4-macros/tests/templates.rs

@@ -200,6 +200,7 @@ fn template_child_without_attribute() {
     let _: MyWidget3 = glib::Object::new(&[]);
 }
 
+#[cfg(target_os = "linux")]
 mod imp4 {
     use super::*;
 
@@ -245,11 +246,13 @@ mod imp4 {
     impl WidgetImpl for MyWidget4 {}
 }
 
+#[cfg(target_os = "linux")]
 glib::wrapper! {
     pub struct MyWidget4(ObjectSubclass<imp4::MyWidget4>) @extends gtk::Widget;
 }
 
 #[gtk::test]
+#[cfg(target_os = "linux")]
 fn blueprint_template() {
     let _: MyWidget4 = glib::Object::new(&[]);
 }