cxx-qt-build: check the links key when exporting

Author: ahayzen-kdab

crates/cxx-qt-build/src/interface.rs

@@ -107,6 +107,11 @@ impl Interface {
     /// Export the manifest for this crate so that is can be used by downstream
     /// crates or CMake
     pub fn export(mut self) {
+        // Ensure that a link name has been set
+        if self.manifest.link_name.is_empty() {
+            panic!("The links key must be set when exporting with CXX-Qt-build");
+        }
+
         self.write_exported_include_directories();
 
         // We automatically reexport all qt_modules and downstream dependencies

crates/cxx-qt-build/src/lib.rs

@@ -1123,8 +1123,7 @@ extern "C" bool {init_fun}() {{
         Interface {
             manifest: Manifest {
                 name: crate_name(),
-                link_name: link_name()
-                    .expect("The links key must be set when creating a library with CXX-Qt-build!"),
+                link_name: link_name().unwrap_or_default(),
                 initializers: vec![public_initializer.strip_file()],
                 qt_modules: qt_modules.into_iter().collect(),
                 exported_include_prefixes: vec![],