From ced9225aa1496b32950d88520ec4b5e9cae16fdb Mon Sep 17 00:00:00 2001
From: cgmossa <cgmossa@gmail.com>
Date: Sat, 18 Nov 2023 17:58:44 +0100
Subject: [PATCH] Replace `SEXPREC` with something truly opaque

---
 build.rs   | 3 +++
 src/lib.rs | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/build.rs b/build.rs
index 89786350..ed3e8c12 100644
--- a/build.rs
+++ b/build.rs
@@ -520,6 +520,9 @@ fn generate_bindings(r_paths: &InstallationPaths, version_info: &RVersionInfo) {
     // Remove all Fortran items, these are items with underscore _ postfix
     let bindgen_builder = bindgen_builder.blocklist_item("[A-Za-z_][A-Za-z0-9_]*[^_]_$");
 
+    // Ensure that `SEXPREC` is opaque to Rust
+    let bindgen_builder = bindgen_builder.blocklist_item("SEXPREC");
+
     // Finish the builder and generate the bindings.
     let bindings = bindgen_builder
         .raw_line(format!(
diff --git a/src/lib.rs b/src/lib.rs
index cd882a0a..eae3655d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -66,6 +66,10 @@
 
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
 
+#[repr(transparent)]
+#[derive(Debug)]
+pub struct SEXPREC(std::ffi::c_void);
+
 #[cfg(test)]
 mod tests {
     use super::*;