ObjC: Handle boolean fixed type for enum.

Before this commit, we assert failure in ImplicitCastExpr
"unheralded conversion to bool". This commit fixes the assertion by using
the correct cast type when the fixed type is boolean.

This commit also fixes the behavior for Microsoft mode as well, since
Obj-C and Microsoft mode share the same code path.

rdar://24999533

llvm-svn: 264167

2 files changed, 9 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 1abd7d0ae6b..c8a9b9ac807 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -14146,7 +14146,10 @@ EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
             } else
               Diag(IdLoc, diag::err_enumerator_too_large) << EltTy;
           } else
-            Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).get();
+            Val = ImpCastExprToType(Val, EltTy,
+                                    EltTy->isBooleanType() ?
+                                    CK_IntegralToBoolean : CK_IntegralCast)
+                    .get();
         } else if (getLangOpts().CPlusPlus) {
           // C++11 [dcl.enum]p5:
           //   If the underlying type is not fixed, the type of each enumerator
diff --git a/clang/test/SemaObjC/enum-fixed-type.m b/clang/test/SemaObjC/enum-fixed-type.m
index c00e45a03ed..37d2810a504 100644
--- a/clang/test/SemaObjC/enum-fixed-type.m
+++ b/clang/test/SemaObjC/enum-fixed-type.m
@@ -38,3 +38,8 @@ int arr3[(long long)Bar == (long long)-1 ? 1 : -1];
 
 typedef enum : Integer { BaseElem } BaseEnum;
 typedef enum : BaseEnum { DerivedElem } DerivedEnum; // expected-error {{non-integral type 'BaseEnum' is an invalid underlying type}}
+
+// <rdar://problem/24999533>
+enum MyEnum : _Bool {
+  MyThing = 0
+};