diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h
index e6f69afa2ec..52e9c4713e1 100644
--- a/include/llvm-c/lto.h
+++ b/include/llvm-c/lto.h
@@ -20,25 +20,26 @@
 #include <stddef.h>
 #include "llvm/System/DataTypes.h"
 
-#define LTO_API_VERSION 3
+#define LTO_API_VERSION 4
 
 typedef enum {
-    LTO_SYMBOL_ALIGNMENT_MASK         = 0x0000001F,    /* log2 of alignment */
-    LTO_SYMBOL_PERMISSIONS_MASK       = 0x000000E0,    
-    LTO_SYMBOL_PERMISSIONS_CODE       = 0x000000A0,    
-    LTO_SYMBOL_PERMISSIONS_DATA       = 0x000000C0,    
-    LTO_SYMBOL_PERMISSIONS_RODATA     = 0x00000080,    
-    LTO_SYMBOL_DEFINITION_MASK        = 0x00000700,    
-    LTO_SYMBOL_DEFINITION_REGULAR     = 0x00000100,    
-    LTO_SYMBOL_DEFINITION_TENTATIVE   = 0x00000200,    
-    LTO_SYMBOL_DEFINITION_WEAK        = 0x00000300,    
-    LTO_SYMBOL_DEFINITION_UNDEFINED   = 0x00000400,    
-    LTO_SYMBOL_DEFINITION_WEAKUNDEF   = 0x00000500,
-    LTO_SYMBOL_SCOPE_MASK             = 0x00003800,    
-    LTO_SYMBOL_SCOPE_INTERNAL         = 0x00000800,    
-    LTO_SYMBOL_SCOPE_HIDDEN           = 0x00001000,    
-    LTO_SYMBOL_SCOPE_PROTECTED        = 0x00002000,    
-    LTO_SYMBOL_SCOPE_DEFAULT          = 0x00001800    
+    LTO_SYMBOL_ALIGNMENT_MASK              = 0x0000001F, /* log2 of alignment */
+    LTO_SYMBOL_PERMISSIONS_MASK            = 0x000000E0,    
+    LTO_SYMBOL_PERMISSIONS_CODE            = 0x000000A0,    
+    LTO_SYMBOL_PERMISSIONS_DATA            = 0x000000C0,    
+    LTO_SYMBOL_PERMISSIONS_RODATA          = 0x00000080,    
+    LTO_SYMBOL_DEFINITION_MASK             = 0x00000700,    
+    LTO_SYMBOL_DEFINITION_REGULAR          = 0x00000100,    
+    LTO_SYMBOL_DEFINITION_TENTATIVE        = 0x00000200,    
+    LTO_SYMBOL_DEFINITION_WEAK             = 0x00000300,    
+    LTO_SYMBOL_DEFINITION_UNDEFINED        = 0x00000400,    
+    LTO_SYMBOL_DEFINITION_WEAKUNDEF        = 0x00000500,
+    LTO_SYMBOL_SCOPE_MASK                  = 0x00003800,    
+    LTO_SYMBOL_SCOPE_INTERNAL              = 0x00000800,    
+    LTO_SYMBOL_SCOPE_HIDDEN                = 0x00001000,    
+    LTO_SYMBOL_SCOPE_PROTECTED             = 0x00002000,    
+    LTO_SYMBOL_SCOPE_DEFAULT               = 0x00001800,
+    LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800
 } lto_symbol_attributes;
 
 typedef enum {
diff --git a/tools/lto/LTOModule.cpp b/tools/lto/LTOModule.cpp
index fc028a27c5d..c4798ff3acc 100644
--- a/tools/lto/LTOModule.cpp
+++ b/tools/lto/LTOModule.cpp
@@ -327,24 +327,24 @@ void LTOModule::addDefinedSymbol(GlobalValue *def, Mangler &mangler,
   // set definition part
   if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
       def->hasLinkerPrivateWeakLinkage() ||
-      def->hasLinkerPrivateWeakDefAutoLinkage()) {
+      def->hasLinkerPrivateWeakDefAutoLinkage())
     attr |= LTO_SYMBOL_DEFINITION_WEAK;
-  }
-  else if (def->hasCommonLinkage()) {
+  else if (def->hasCommonLinkage())
     attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
-  }
-  else {
+  else
     attr |= LTO_SYMBOL_DEFINITION_REGULAR;
-  }
 
   // set scope part
   if (def->hasHiddenVisibility())
     attr |= LTO_SYMBOL_SCOPE_HIDDEN;
   else if (def->hasProtectedVisibility())
     attr |= LTO_SYMBOL_SCOPE_PROTECTED;
-  else if (def->hasExternalLinkage() || def->hasWeakLinkage()
-           || def->hasLinkOnceLinkage() || def->hasCommonLinkage())
+  else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
+           def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
+           def->hasLinkerPrivateWeakLinkage())
     attr |= LTO_SYMBOL_SCOPE_DEFAULT;
+  else if (def->hasLinkerPrivateWeakDefAutoLinkage())
+    attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
   else
     attr |= LTO_SYMBOL_SCOPE_INTERNAL;