Implement cast C enum -> int

0004-Disable-some-more-unsupported-stuff-in-libcore.patch

@@ -4,37 +4,8 @@ Date: Thu, 23 Aug 2018 11:15:01 +0200
 Subject: [PATCH] Disable some more unsupported stuff in libcore
 
 ---
- src/libcore/cmp.rs     | 5 ++++-
  src/libcore/num/mod.rs | 8 ++++++--
- 2 files changed, 9 insertions(+), 3 deletions(-)
-
-diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
-index a6e6496..f9374ea 100644
---- a/src/libcore/cmp.rs
-+++ b/src/libcore/cmp.rs
-@@ -496,6 +496,7 @@ pub trait Ord: Eq + PartialOrd<Self> {
- #[stable(feature = "rust1", since = "1.0.0")]
- impl Eq for Ordering {}
-
-+/*
- #[stable(feature = "rust1", since = "1.0.0")]
- impl Ord for Ordering {
-     #[inline]
-@@ -503,12 +504,14 @@ impl Ord for Ordering {
-         (*self as i32).cmp(&(*other as i32))
-     }
- }
-+*/
-
- #[stable(feature = "rust1", since = "1.0.0")]
- impl PartialOrd for Ordering {
-     #[inline]
-     fn partial_cmp(&self, other: &Ordering) -> Option<Ordering> {
--        (*self as i32).partial_cmp(&(*other as i32))
-+        //(*self as i32).partial_cmp(&(*other as i32))
-+        None
-     }
- }
+ 1 files changed, 8 insertions(+), 2 deletions(-)
 
 diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
 index 5d00949..f077f1d 100644

src/base.rs

@@ -571,6 +571,10 @@ fn trans_stmt<'a, 'tcx: 'a>(
                             };
                             lval.write_cvalue(fx, CValue::ByVal(res, dest_layout));
                         }
+                        (ty::Adt(adt_def, _substs), ty::Uint(_)) | (ty::Adt(adt_def, _substs), ty::Int(_)) if adt_def.is_enum() => {
+                            let discr = trans_get_discriminant(fx, operand, fx.layout_of(to_ty));
+                            lval.write_cvalue(fx, discr);
+                        }
                         _ => unimpl!("rval misc {:?} {:?}", from_ty, to_ty),
                     }
                 }