Deprecate Rust targets lower or equal than `1.30` (#2356)

1 files changed, 7 insertions, 0 deletions

diff --git a/bindgen/lib.rs b/bindgen/lib.rs
index 53bbd887..4b71fb97 100644
--- a/bindgen/lib.rs
+++ b/bindgen/lib.rs
@@ -731,6 +731,13 @@ impl Builder {
     ///
     /// The default is the latest stable Rust version
     pub fn rust_target(mut self, rust_target: RustTarget) -> Self {
+        #[allow(deprecated)]
+        if rust_target <= RustTarget::Stable_1_30 {
+            warn!(
+                "The {} rust target is deprecated. If you have a good reason to use this target please report it at https://github.com/rust-lang/rust-bindgen/issues",
+                String::from(rust_target)
+            );
+        }
         self.options.set_rust_target(rust_target);
         self
     }