Add single-file test

Author: lucic71

tests/unit/opaque_forward_decl.c

@@ -0,0 +1,15 @@
+#include <stddef.h>
+
+/* Forward declaration only; no body for `opaque` anywhere in this TU. */
+struct opaque;
+
+struct container {
+  struct opaque *p;
+  int x;
+};
+
+int main(void) {
+  struct container c = {NULL, 42};
+  (void)c.p;
+  return c.x - 42;
+}

tests/unit/out/refcount/opaque_forward_decl.rs

@@ -0,0 +1,29 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+#[derive(Default)]
+pub struct container {
+    pub p: Value<Ptr<opaque>>,
+    pub x: Value<i32>,
+}
+impl ByteRepr for container {}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    let c: Value<container> = Rc::new(RefCell::new(container {
+        p: Rc::new(RefCell::new(Ptr::<opaque>::null())),
+        x: Rc::new(RefCell::new(42)),
+    }));
+    (*(*c.borrow()).p.borrow()).clone();
+    return ((*(*c.borrow()).x.borrow()) - 42);
+}
+#[repr(C)]
+pub struct opaque {
+    _opaque: [u8; 0],
+}

tests/unit/out/unsafe/opaque_forward_decl.rs

@@ -0,0 +1,31 @@
+extern crate libc;
+use libc::*;
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::collections::BTreeMap;
+use std::io::{Read, Seek, Write};
+use std::os::fd::{AsFd, FromRawFd, IntoRawFd};
+use std::rc::Rc;
+#[repr(C)]
+#[derive(Copy, Clone, Default)]
+pub struct container {
+    pub p: *mut opaque,
+    pub x: i32,
+}
+pub fn main() {
+    unsafe {
+        std::process::exit(main_0() as i32);
+    }
+}
+unsafe fn main_0() -> i32 {
+    let mut c: container = container {
+        p: std::ptr::null_mut(),
+        x: 42,
+    };
+    &(c.p);
+    return ((c.x) - (42));
+}
+#[repr(C)]
+pub struct opaque {
+    _opaque: [u8; 0],
+}