Index: clang/include/clang/Format/Format.h
===================================================================
--- clang/include/clang/Format/Format.h
+++ clang/include/clang/Format/Format.h
@@ -221,6 +221,20 @@
   /// \endcode
   bool AllowAllParametersOfDeclarationOnNextLine;
 
+  /// Allow enums on a single line.
+  /// \code
+  ///   true:
+  ///   enum { A, B } myEnum;
+  ///
+  ///   false:
+  ///   enum
+  ///   {
+  ///     A,
+  ///     B,
+  ///   } myEnum;
+  /// \endcode
+  bool AllowEnumsOnASingleLine;
+  
   /// Different styles for merging short blocks containing at most one
   /// statement.
   enum ShortBlockStyle {
@@ -2160,6 +2174,7 @@
                R.AllowAllConstructorInitializersOnNextLine &&
            AllowAllParametersOfDeclarationOnNextLine ==
                R.AllowAllParametersOfDeclarationOnNextLine &&
+           AllowEnumsOnASingleLine == R.AllowEnumsOnASingleLine &&
            AllowShortBlocksOnASingleLine == R.AllowShortBlocksOnASingleLine &&
            AllowShortCaseLabelsOnASingleLine ==
                R.AllowShortCaseLabelsOnASingleLine &&
Index: clang/lib/Format/Format.cpp
===================================================================
--- clang/lib/Format/Format.cpp
+++ clang/lib/Format/Format.cpp
@@ -397,6 +397,8 @@
                    Style.AllowAllConstructorInitializersOnNextLine);
     IO.mapOptional("AllowAllParametersOfDeclarationOnNextLine",
                    Style.AllowAllParametersOfDeclarationOnNextLine);
+    IO.mapOptional("AllowEnumsOnASingleLine",
+                   Style.AllowEnumsOnASingleLine);
     IO.mapOptional("AllowShortBlocksOnASingleLine",
                    Style.AllowShortBlocksOnASingleLine);
     IO.mapOptional("AllowShortCaseLabelsOnASingleLine",
@@ -752,6 +754,7 @@
   LLVMStyle.AllowAllArgumentsOnNextLine = true;
   LLVMStyle.AllowAllConstructorInitializersOnNextLine = true;
   LLVMStyle.AllowAllParametersOfDeclarationOnNextLine = true;
+  LLVMStyle.AllowEnumsOnASingleLine = true;
   LLVMStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_All;
   LLVMStyle.AllowShortBlocksOnASingleLine = FormatStyle::SBS_Never;
   LLVMStyle.AllowShortCaseLabelsOnASingleLine = false;
@@ -1137,6 +1140,7 @@
   Style.BraceWrapping.BeforeCatch = true;
   Style.BraceWrapping.BeforeElse = true;
   Style.PenaltyReturnTypeOnItsOwnLine = 1000;
+  Style.AllowEnumsOnASingleLine = false;
   Style.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_None;
   Style.AllowShortCaseLabelsOnASingleLine = false;
   Style.AllowShortIfStatementsOnASingleLine = FormatStyle::SIS_Never;
Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -2280,9 +2280,17 @@
     return true;
   }
 
+  if (!Style.AllowEnumsOnASingleLine)
+    addUnwrappedLine();
   // Parse enum body.
   nextToken();
+  if (!Style.AllowEnumsOnASingleLine) {
+    addUnwrappedLine();
+    Line->Level += 1;
+  }
   bool HasError = !parseBracedList(/*ContinueOnSemicolons=*/true);
+  if (!Style.AllowEnumsOnASingleLine)
+    Line->Level -= 1;
   if (HasError) {
     if (FormatTok->is(tok::semi))
       nextToken();