add support for implicit cast from array to pointer that is not the element

type.

llvm-svn: 44809

clang/CodeGen/CodeGenModule.cpp

@@ -404,7 +404,14 @@ static llvm::Constant *GenerateConstantExpr(const Expr *Expression,
       llvm::Constant *Idx0 = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
       
       llvm::Constant *Ops[] = {Idx0, Idx0};
-      return llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
+      C = llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
+      
+      // The resultant pointer type can be implicitly casted to other pointer
+      // types as well, for example void*.
+      const llvm::Type *DestPTy = Types.ConvertType(type);
+      assert(isa<llvm::PointerType>(DestPTy) &&
+             "Only expect implicit cast to pointer");
+      return llvm::ConstantExpr::getBitCast(C, DestPTy);
     }
     
     // If this is an implicit cast of a string literal to an array type, this

clang/test/CodeGen/globalinit.c

@@ -10,7 +10,7 @@ void bar() { x[0] = 1; }
 
 
 extern int y[];
-//void *g = y;
+void *g = y;
 
 int latin_ptr2len (char *p);
 int (*mb_ptr2len) (char *p) = latin_ptr2len;