1 files changed, 17 insertions, 7 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index cfb1f99b07c..cf3ea30bd2c 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -12535,6 +12535,7 @@ Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
   DeclContext *SearchDC = CurContext;
   DeclContext *DC = CurContext;
   bool isStdBadAlloc = false;
+  bool isStdAlignValT = false;
 
   RedeclarationKind Redecl = ForRedeclaration;
   if (TUK == TUK_Friend || TUK == TUK_Reference)
@@ -12689,15 +12690,20 @@ Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
   }
 
   if (getLangOpts().CPlusPlus && Name && DC && StdNamespace &&
-      DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
-    // This is a declaration of or a reference to "std::bad_alloc".
-    isStdBadAlloc = true;
+      DC->Equals(getStdNamespace())) {
+    if (Name->isStr("bad_alloc")) {
+      // This is a declaration of or a reference to "std::bad_alloc".
+      isStdBadAlloc = true;
 
-    if (Previous.empty() && StdBadAlloc) {
-      // std::bad_alloc has been implicitly declared (but made invisible to
-      // name lookup). Fill in this implicit declaration as the previous
+      // If std::bad_alloc has been implicitly declared (but made invisible to
+      // name lookup), fill in this implicit declaration as the previous
       // declaration, so that the declarations get chained appropriately.
-      Previous.addDecl(getStdBadAlloc());
+      if (Previous.empty() && StdBadAlloc)
+        Previous.addDecl(getStdBadAlloc());
+    } else if (Name->isStr("align_val_t")) {
+      isStdAlignValT = true;
+      if (Previous.empty() && StdAlignValT)
+        Previous.addDecl(getStdAlignValT());
     }
   }
 
@@ -13089,6 +13095,10 @@ CreateNewDecl:
     New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
                            cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
                            ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
+
+    if (isStdAlignValT && (!StdAlignValT || getStdAlignValT()->isImplicit()))
+      StdAlignValT = cast<EnumDecl>(New);
+
     // If this is an undefined enum, warn.
     if (TUK != TUK_Definition && !Invalid) {
       TagDecl *Def;