Author: Kevin Sala Penades
Date: 2025-11-07T13:19:37-08:00
New Revision: 64ff52a5e95422e8ea30e7ebc748e0e54ce28e8e

URL: 
https://github.com/llvm/llvm-project/commit/64ff52a5e95422e8ea30e7ebc748e0e54ce28e8e
DIFF: 
https://github.com/llvm/llvm-project/commit/64ff52a5e95422e8ea30e7ebc748e0e54ce28e8e.diff

LOG: [OpenMP][Clang] Add parser/semantic support for dyn_groupprivate clause 
(#152651)

This PR adds support for the `dyn_groupprivate` clause, which will be
part of OpenMP 6.1. This feature allows users to request dynamic shared
memory on target regions.

---------

Co-authored-by: Krzysztof Parzyszek <[email protected]>

Added: 
    clang/test/OpenMP/target_dyn_groupprivate_messages.cpp
    clang/test/OpenMP/target_teams_dyn_groupprivate_messages.cpp
    clang/test/OpenMP/teams_dyn_groupprivate_messages.cpp

Modified: 
    clang/include/clang/AST/OpenMPClause.h
    clang/include/clang/AST/RecursiveASTVisitor.h
    clang/include/clang/Basic/DiagnosticSemaKinds.td
    clang/include/clang/Basic/OpenMPKinds.def
    clang/include/clang/Basic/OpenMPKinds.h
    clang/include/clang/Sema/SemaOpenMP.h
    clang/lib/AST/OpenMPClause.cpp
    clang/lib/AST/StmtProfile.cpp
    clang/lib/Basic/OpenMPKinds.cpp
    clang/lib/Parse/ParseOpenMP.cpp
    clang/lib/Sema/SemaOpenMP.cpp
    clang/lib/Sema/TreeTransform.h
    clang/lib/Serialization/ASTReader.cpp
    clang/lib/Serialization/ASTWriter.cpp
    clang/tools/libclang/CIndex.cpp
    llvm/include/llvm/Frontend/OpenMP/OMP.td
    llvm/unittests/Frontend/OpenMPDecompositionTest.cpp

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/AST/OpenMPClause.h 
b/clang/include/clang/AST/OpenMPClause.h
index 4f507485968cd..3296fbf409552 100644
--- a/clang/include/clang/AST/OpenMPClause.h
+++ b/clang/include/clang/AST/OpenMPClause.h
@@ -10068,6 +10068,152 @@ class OMPXDynCGroupMemClause
   Expr *getSize() const { return getStmtAs<Expr>(); }
 };
 
+/// This represents 'dyn_groupprivate' clause in '#pragma omp target ...'
+/// and '#pragma omp teams ...' directives.
+///
+/// \code
+/// #pragma omp target [...] dyn_groupprivate(a,b: N)
+/// \endcode
+class OMPDynGroupprivateClause : public OMPClause, public OMPClauseWithPreInit 
{
+  friend class OMPClauseReader;
+
+  /// Location of '('.
+  SourceLocation LParenLoc;
+
+  /// Modifiers for 'dyn_groupprivate' clause.
+  enum { SIMPLE, FALLBACK, NUM_MODIFIERS };
+  unsigned Modifiers[NUM_MODIFIERS];
+
+  /// Locations of modifiers.
+  SourceLocation ModifiersLoc[NUM_MODIFIERS];
+
+  /// The size of the dyn_groupprivate.
+  Expr *Size = nullptr;
+
+  /// Set the first dyn_groupprivate modifier.
+  ///
+  /// \param M The modifier.
+  void setDynGroupprivateModifier(OpenMPDynGroupprivateClauseModifier M) {
+    Modifiers[SIMPLE] = M;
+  }
+
+  /// Set the second dyn_groupprivate modifier.
+  ///
+  /// \param M The modifier.
+  void setDynGroupprivateFallbackModifier(
+      OpenMPDynGroupprivateClauseFallbackModifier M) {
+    Modifiers[FALLBACK] = M;
+  }
+
+  /// Set location of the first dyn_groupprivate modifier.
+  void setDynGroupprivateModifierLoc(SourceLocation Loc) {
+    ModifiersLoc[SIMPLE] = Loc;
+  }
+
+  /// Set location of the second dyn_groupprivate modifier.
+  void setDynGroupprivateFallbackModifierLoc(SourceLocation Loc) {
+    ModifiersLoc[FALLBACK] = Loc;
+  }
+
+  /// Sets the location of '('.
+  ///
+  /// \param Loc Location of '('.
+  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }
+
+  /// Set size.
+  ///
+  /// \param E Size.
+  void setSize(Expr *E) { Size = E; }
+
+public:
+  /// Build 'dyn_groupprivate' clause with a size expression \a Size.
+  ///
+  /// \param StartLoc Starting location of the clause.
+  /// \param LParenLoc Location of '('.
+  /// \param EndLoc Ending location of the clause.
+  /// \param Size Size.
+  /// \param M1 The first modifier applied to 'dyn_groupprivate' clause.
+  /// \param M1Loc Location of the first modifier.
+  /// \param M2 The second modifier applied to 'dyn_groupprivate' clause.
+  /// \param M2Loc Location of the second modifier.
+  OMPDynGroupprivateClause(SourceLocation StartLoc, SourceLocation LParenLoc,
+                           SourceLocation EndLoc, Expr *Size, Stmt *HelperSize,
+                           OpenMPDirectiveKind CaptureRegion,
+                           OpenMPDynGroupprivateClauseModifier M1,
+                           SourceLocation M1Loc,
+                           OpenMPDynGroupprivateClauseFallbackModifier M2,
+                           SourceLocation M2Loc)
+      : OMPClause(llvm::omp::OMPC_dyn_groupprivate, StartLoc, EndLoc),
+        OMPClauseWithPreInit(this), LParenLoc(LParenLoc), Size(Size) {
+    setPreInitStmt(HelperSize, CaptureRegion);
+    Modifiers[SIMPLE] = M1;
+    Modifiers[FALLBACK] = M2;
+    ModifiersLoc[SIMPLE] = M1Loc;
+    ModifiersLoc[FALLBACK] = M2Loc;
+  }
+
+  /// Build an empty clause.
+  explicit OMPDynGroupprivateClause()
+      : OMPClause(llvm::omp::OMPC_dyn_groupprivate, SourceLocation(),
+                  SourceLocation()),
+        OMPClauseWithPreInit(this) {
+    Modifiers[SIMPLE] = OMPC_DYN_GROUPPRIVATE_unknown;
+    Modifiers[FALLBACK] = OMPC_DYN_GROUPPRIVATE_FALLBACK_unknown;
+  }
+
+  /// Get the first modifier of the clause.
+  OpenMPDynGroupprivateClauseModifier getDynGroupprivateModifier() const {
+    return static_cast<OpenMPDynGroupprivateClauseModifier>(Modifiers[SIMPLE]);
+  }
+
+  /// Get the second modifier of the clause.
+  OpenMPDynGroupprivateClauseFallbackModifier
+  getDynGroupprivateFallbackModifier() const {
+    return static_cast<OpenMPDynGroupprivateClauseFallbackModifier>(
+        Modifiers[FALLBACK]);
+  }
+
+  /// Get location of '('.
+  SourceLocation getLParenLoc() { return LParenLoc; }
+
+  /// Get the first modifier location.
+  SourceLocation getDynGroupprivateModifierLoc() const {
+    return ModifiersLoc[SIMPLE];
+  }
+
+  /// Get the second modifier location.
+  SourceLocation getDynGroupprivateFallbackModifierLoc() const {
+    return ModifiersLoc[FALLBACK];
+  }
+
+  /// Get size.
+  Expr *getSize() { return Size; }
+
+  /// Get size.
+  const Expr *getSize() const { return Size; }
+
+  child_range children() {
+    return child_range(reinterpret_cast<Stmt **>(&Size),
+                       reinterpret_cast<Stmt **>(&Size) + 1);
+  }
+
+  const_child_range children() const {
+    auto Children = const_cast<OMPDynGroupprivateClause *>(this)->children();
+    return const_child_range(Children.begin(), Children.end());
+  }
+
+  child_range used_children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range used_children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+
+  static bool classof(const OMPClause *T) {
+    return T->getClauseKind() == llvm::omp::OMPC_dyn_groupprivate;
+  }
+};
+
 /// This represents the 'doacross' clause for the '#pragma omp ordered'
 /// directive.
 ///

diff  --git a/clang/include/clang/AST/RecursiveASTVisitor.h 
b/clang/include/clang/AST/RecursiveASTVisitor.h
index 8cb0a657023b4..8f427427d71ed 100644
--- a/clang/include/clang/AST/RecursiveASTVisitor.h
+++ b/clang/include/clang/AST/RecursiveASTVisitor.h
@@ -4165,6 +4165,14 @@ bool 
RecursiveASTVisitor<Derived>::VisitOMPXDynCGroupMemClause(
   return true;
 }
 
+template <typename Derived>
+bool RecursiveASTVisitor<Derived>::VisitOMPDynGroupprivateClause(
+    OMPDynGroupprivateClause *C) {
+  TRY_TO(VisitOMPClauseWithPreInit(C));
+  TRY_TO(TraverseStmt(C->getSize()));
+  return true;
+}
+
 template <typename Derived>
 bool RecursiveASTVisitor<Derived>::VisitOMPDoacrossClause(
     OMPDoacrossClause *C) {

diff  --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td 
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 04f2e8d654fd5..3e864475f22a1 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -12137,6 +12137,9 @@ def err_omp_unexpected_schedule_modifier : Error<
   "modifier '%0' cannot be used along with modifier '%1'">;
 def err_omp_schedule_nonmonotonic_static : Error<
   "'nonmonotonic' modifier can only be specified with 'dynamic' or 'guided' 
schedule kind">;
+def err_omp_incompatible_dyn_groupprivate_modifier
+    : Error<"modifier '%0' cannot be used along with modifier '%1' in "
+            "dyn_groupprivate">;
 def err_omp_simple_clause_incompatible_with_ordered : Error<
   "'%0' clause with '%1' modifier cannot be specified if an 'ordered' clause 
is specified">;
 def err_omp_ordered_simd : Error<

diff  --git a/clang/include/clang/Basic/OpenMPKinds.def 
b/clang/include/clang/Basic/OpenMPKinds.def
index 328a0747a82a8..166b80314f687 100644
--- a/clang/include/clang/Basic/OpenMPKinds.def
+++ b/clang/include/clang/Basic/OpenMPKinds.def
@@ -86,6 +86,12 @@
 #ifndef OPENMP_GRAINSIZE_MODIFIER
 #define OPENMP_GRAINSIZE_MODIFIER(Name)
 #endif
+#ifndef OPENMP_DYN_GROUPPRIVATE_MODIFIER
+#define OPENMP_DYN_GROUPPRIVATE_MODIFIER(Name)
+#endif
+#ifndef OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER
+#define OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER(Name)
+#endif
 #ifndef OPENMP_NUMTASKS_MODIFIER
 #define OPENMP_NUMTASKS_MODIFIER(Name)
 #endif
@@ -242,6 +248,14 @@ OPENMP_BIND_KIND(thread)
 // Modifiers for the 'grainsize' clause.
 OPENMP_GRAINSIZE_MODIFIER(strict)
 
+// Modifiers for the 'dyn_groupprivate' clause.
+OPENMP_DYN_GROUPPRIVATE_MODIFIER(cgroup)
+
+// Fallback modifiers for the 'dyn_groupprivate' clause.
+OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER(abort)
+OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER(null)
+OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER(default_mem)
+
 // Modifiers for the 'num_tasks' clause.
 OPENMP_NUMTASKS_MODIFIER(strict)
 
@@ -263,6 +277,8 @@ OPENMP_THREADSET_KIND(omp_team)
 
 #undef OPENMP_NUMTASKS_MODIFIER
 #undef OPENMP_NUMTHREADS_MODIFIER
+#undef OPENMP_DYN_GROUPPRIVATE_MODIFIER
+#undef OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER
 #undef OPENMP_GRAINSIZE_MODIFIER
 #undef OPENMP_BIND_KIND
 #undef OPENMP_ADJUST_ARGS_KIND

diff  --git a/clang/include/clang/Basic/OpenMPKinds.h 
b/clang/include/clang/Basic/OpenMPKinds.h
index c9ddbcd6d46c1..41b2c4e41dcb8 100644
--- a/clang/include/clang/Basic/OpenMPKinds.h
+++ b/clang/include/clang/Basic/OpenMPKinds.h
@@ -224,6 +224,20 @@ enum OpenMPGrainsizeClauseModifier {
   OMPC_GRAINSIZE_unknown
 };
 
+enum OpenMPDynGroupprivateClauseModifier {
+#define OPENMP_DYN_GROUPPRIVATE_MODIFIER(Name) OMPC_DYN_GROUPPRIVATE_##Name,
+#include "clang/Basic/OpenMPKinds.def"
+  OMPC_DYN_GROUPPRIVATE_unknown
+};
+
+enum OpenMPDynGroupprivateClauseFallbackModifier {
+  OMPC_DYN_GROUPPRIVATE_FALLBACK_unknown = OMPC_DYN_GROUPPRIVATE_unknown,
+#define OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER(Name)                        
\
+  OMPC_DYN_GROUPPRIVATE_FALLBACK_##Name,
+#include "clang/Basic/OpenMPKinds.def"
+  OMPC_DYN_GROUPPRIVATE_FALLBACK_last
+};
+
 enum OpenMPNumTasksClauseModifier {
 #define OPENMP_NUMTASKS_MODIFIER(Name) OMPC_NUMTASKS_##Name,
 #include "clang/Basic/OpenMPKinds.def"

diff  --git a/clang/include/clang/Sema/SemaOpenMP.h 
b/clang/include/clang/Sema/SemaOpenMP.h
index ba12b403d9b9a..e5628e845c9ee 100644
--- a/clang/include/clang/Sema/SemaOpenMP.h
+++ b/clang/include/clang/Sema/SemaOpenMP.h
@@ -1411,6 +1411,13 @@ class SemaOpenMP : public SemaBase {
                                             SourceLocation LParenLoc,
                                             SourceLocation EndLoc);
 
+  /// Called on a well-formed 'dyn_groupprivate' clause.
+  OMPClause *ActOnOpenMPDynGroupprivateClause(
+      OpenMPDynGroupprivateClauseModifier M1,
+      OpenMPDynGroupprivateClauseFallbackModifier M2, Expr *Size,
+      SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation M1Loc,
+      SourceLocation M2Loc, SourceLocation EndLoc);
+
   /// Called on well-formed 'doacross' clause.
   OMPClause *
   ActOnOpenMPDoacrossClause(OpenMPDoacrossClauseModifier DepType,

diff  --git a/clang/lib/AST/OpenMPClause.cpp b/clang/lib/AST/OpenMPClause.cpp
index 59d94590e04d1..0640fed823771 100644
--- a/clang/lib/AST/OpenMPClause.cpp
+++ b/clang/lib/AST/OpenMPClause.cpp
@@ -105,6 +105,8 @@ const OMPClauseWithPreInit *OMPClauseWithPreInit::get(const 
OMPClause *C) {
     return static_cast<const OMPFilterClause *>(C);
   case OMPC_ompx_dyn_cgroup_mem:
     return static_cast<const OMPXDynCGroupMemClause *>(C);
+  case OMPC_dyn_groupprivate:
+    return static_cast<const OMPDynGroupprivateClause *>(C);
   case OMPC_message:
     return static_cast<const OMPMessageClause *>(C);
   case OMPC_default:
@@ -2857,6 +2859,24 @@ void OMPClausePrinter::VisitOMPXDynCGroupMemClause(
   OS << ")";
 }
 
+void OMPClausePrinter::VisitOMPDynGroupprivateClause(
+    OMPDynGroupprivateClause *Node) {
+  OS << "dyn_groupprivate(";
+  if (Node->getDynGroupprivateModifier() != OMPC_DYN_GROUPPRIVATE_unknown) {
+    OS << getOpenMPSimpleClauseTypeName(OMPC_dyn_groupprivate,
+                                        Node->getDynGroupprivateModifier());
+    if (Node->getDynGroupprivateFallbackModifier() !=
+        OMPC_DYN_GROUPPRIVATE_FALLBACK_unknown) {
+      OS << ", ";
+      OS << getOpenMPSimpleClauseTypeName(
+          OMPC_dyn_groupprivate, Node->getDynGroupprivateFallbackModifier());
+    }
+    OS << ": ";
+  }
+  Node->getSize()->printPretty(OS, nullptr, Policy, 0);
+  OS << ')';
+}
+
 void OMPClausePrinter::VisitOMPDoacrossClause(OMPDoacrossClause *Node) {
   OS << "doacross(";
   OpenMPDoacrossClauseModifier DepType = Node->getDependenceType();

diff  --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index c909e1bcecd38..4a8c638c85331 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -968,6 +968,12 @@ void OMPClauseProfiler::VisitOMPXDynCGroupMemClause(
   if (Expr *Size = C->getSize())
     Profiler->VisitStmt(Size);
 }
+void OMPClauseProfiler::VisitOMPDynGroupprivateClause(
+    const OMPDynGroupprivateClause *C) {
+  VisitOMPClauseWithPreInit(C);
+  if (auto *Size = C->getSize())
+    Profiler->VisitStmt(Size);
+}
 void OMPClauseProfiler::VisitOMPDoacrossClause(const OMPDoacrossClause *C) {
   VisitOMPClauseList(C);
 }

diff  --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index 3d41f2d197b81..8e60fc26a7947 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -196,6 +196,16 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind 
Kind, StringRef Str,
       return OMPC_GRAINSIZE_unknown;
     return Type;
   }
+  case OMPC_dyn_groupprivate: {
+    return llvm::StringSwitch<unsigned>(Str)
+#define OPENMP_DYN_GROUPPRIVATE_MODIFIER(Name)                                 
\
+  .Case(#Name, OMPC_DYN_GROUPPRIVATE_##Name)
+#define OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER(Name)                        
\
+  .Case(#Name, OMPC_DYN_GROUPPRIVATE_FALLBACK_##Name)                          
\
+      .Case("fallback(" #Name ")", OMPC_DYN_GROUPPRIVATE_FALLBACK_##Name)
+#include "clang/Basic/OpenMPKinds.def"
+        .Default(OMPC_DYN_GROUPPRIVATE_unknown);
+  }
   case OMPC_num_tasks: {
     unsigned Type = llvm::StringSwitch<unsigned>(Str)
 #define OPENMP_NUMTASKS_MODIFIER(Name) .Case(#Name, OMPC_NUMTASKS_##Name)
@@ -544,6 +554,20 @@ const char 
*clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
 #include "clang/Basic/OpenMPKinds.def"
     }
     llvm_unreachable("Invalid OpenMP 'grainsize' clause modifier");
+  case OMPC_dyn_groupprivate:
+    switch (Type) {
+    case OMPC_DYN_GROUPPRIVATE_unknown:
+    case OMPC_DYN_GROUPPRIVATE_FALLBACK_last:
+      return "unknown";
+#define OPENMP_DYN_GROUPPRIVATE_MODIFIER(Name)                                 
\
+  case OMPC_DYN_GROUPPRIVATE_##Name:                                           
\
+    return #Name;
+#define OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER(Name)                        
\
+  case OMPC_DYN_GROUPPRIVATE_FALLBACK_##Name:                                  
\
+    return "fallback(" #Name ")";
+#include "clang/Basic/OpenMPKinds.def"
+    }
+    llvm_unreachable("Invalid OpenMP 'dyn_groupprivate' clause modifier");
   case OMPC_num_tasks:
     switch (Type) {
     case OMPC_NUMTASKS_unknown:

diff  --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 31bc941e6a015..334438edfc2e8 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -3178,6 +3178,7 @@ OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind 
DKind,
   case OMPC_align:
   case OMPC_message:
   case OMPC_ompx_dyn_cgroup_mem:
+  case OMPC_dyn_groupprivate:
     // OpenMP [2.5, Restrictions]
     //  At most one num_threads clause can appear on the directive.
     // OpenMP [2.8.1, simd construct, Restrictions]
@@ -3216,7 +3217,7 @@ OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind 
DKind,
         PP.LookAhead(/*N=*/0).isNot(tok::l_paren))
       Clause = ParseOpenMPClause(CKind, WrongDirective);
     else if (CKind == OMPC_grainsize || CKind == OMPC_num_tasks ||
-             CKind == OMPC_num_threads)
+             CKind == OMPC_num_threads || CKind == OMPC_dyn_groupprivate)
       Clause = ParseOpenMPSingleExprWithArgClause(DKind, CKind, 
WrongDirective);
     else
       Clause = ParseOpenMPSingleExprClause(CKind, WrongDirective);
@@ -4009,6 +4010,83 @@ OMPClause 
*Parser::ParseOpenMPSingleExprWithArgClause(OpenMPDirectiveKind DKind,
       Arg.push_back(OMPC_GRAINSIZE_unknown);
       KLoc.emplace_back();
     }
+  } else if (Kind == OMPC_dyn_groupprivate) {
+    enum { SimpleModifier, ComplexModifier, NumberOfModifiers };
+    Arg.resize(NumberOfModifiers);
+    KLoc.resize(NumberOfModifiers);
+    Arg[SimpleModifier] = OMPC_DYN_GROUPPRIVATE_unknown;
+    Arg[ComplexModifier] = OMPC_DYN_GROUPPRIVATE_FALLBACK_unknown;
+
+    auto ConsumeModifier = [&]() {
+      unsigned Type = NumberOfModifiers;
+      unsigned Modifier;
+      SourceLocation Loc;
+      if (!Tok.isAnnotation() && PP.getSpelling(Tok) == "fallback" &&
+          NextToken().is(tok::l_paren)) {
+        ConsumeToken();
+        BalancedDelimiterTracker ParenT(*this, tok::l_paren, tok::r_paren);
+        ParenT.consumeOpen();
+
+        Modifier = getOpenMPSimpleClauseType(
+            Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok), 
getLangOpts());
+        if (Modifier <= OMPC_DYN_GROUPPRIVATE_FALLBACK_unknown ||
+            Modifier >= OMPC_DYN_GROUPPRIVATE_FALLBACK_last) {
+          Diag(Tok.getLocation(), diag::err_expected)
+              << "'abort', 'null' or 'default_mem' in fallback modifier";
+          SkipUntil(tok::r_paren);
+          return std::make_tuple(Type, Modifier, Loc);
+        }
+        Type = ComplexModifier;
+        Loc = Tok.getLocation();
+        if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
+            Tok.isNot(tok::annot_pragma_openmp_end))
+          ConsumeAnyToken();
+        ParenT.consumeClose();
+      } else {
+        Modifier = getOpenMPSimpleClauseType(
+            Kind, Tok.isAnnotation() ? "" : PP.getSpelling(Tok), 
getLangOpts());
+        if (Modifier < OMPC_DYN_GROUPPRIVATE_unknown) {
+          Type = SimpleModifier;
+          Loc = Tok.getLocation();
+          if (Tok.isNot(tok::r_paren) && Tok.isNot(tok::comma) &&
+              Tok.isNot(tok::annot_pragma_openmp_end))
+            ConsumeAnyToken();
+        }
+      }
+      return std::make_tuple(Type, Modifier, Loc);
+    };
+
+    auto SaveModifier = [&](unsigned Type, unsigned Modifier,
+                            SourceLocation Loc) {
+      assert(Type < NumberOfModifiers && "Unexpected modifier type");
+      if (!KLoc[Type].isValid()) {
+        Arg[Type] = Modifier;
+        KLoc[Type] = Loc;
+      } else {
+        Diag(Loc, diag::err_omp_incompatible_dyn_groupprivate_modifier)
+            << getOpenMPSimpleClauseTypeName(OMPC_dyn_groupprivate, Modifier)
+            << getOpenMPSimpleClauseTypeName(OMPC_dyn_groupprivate, Arg[Type]);
+      }
+    };
+
+    // Parse 'modifier'
+    auto [Type1, Mod1, Loc1] = ConsumeModifier();
+    if (Type1 < NumberOfModifiers) {
+      SaveModifier(Type1, Mod1, Loc1);
+      if (Tok.is(tok::comma)) {
+        // Parse ',' 'modifier'
+        ConsumeAnyToken();
+        auto [Type2, Mod2, Loc2] = ConsumeModifier();
+        if (Type2 < NumberOfModifiers)
+          SaveModifier(Type2, Mod2, Loc2);
+      }
+      // Parse ':'
+      if (Tok.is(tok::colon))
+        ConsumeAnyToken();
+      else
+        Diag(Tok, diag::warn_pragma_expected_colon)
+            << "dyn_groupprivate modifier";
+    }
   } else if (Kind == OMPC_num_tasks) {
     // Parse optional <num_tasks modifier> ':'
     OpenMPNumTasksClauseModifier Modifier =
@@ -4083,11 +4161,11 @@ OMPClause 
*Parser::ParseOpenMPSingleExprWithArgClause(OpenMPDirectiveKind DKind,
     }
   }
 
-  bool NeedAnExpression = (Kind == OMPC_schedule && DelimLoc.isValid()) ||
-                          (Kind == OMPC_dist_schedule && DelimLoc.isValid()) ||
-                          Kind == OMPC_if || Kind == OMPC_device ||
-                          Kind == OMPC_grainsize || Kind == OMPC_num_tasks ||
-                          Kind == OMPC_num_threads;
+  bool NeedAnExpression =
+      (Kind == OMPC_schedule && DelimLoc.isValid()) ||
+      (Kind == OMPC_dist_schedule && DelimLoc.isValid()) || Kind == OMPC_if ||
+      Kind == OMPC_device || Kind == OMPC_grainsize || Kind == OMPC_num_tasks 
||
+      Kind == OMPC_num_threads || Kind == OMPC_dyn_groupprivate;
   if (NeedAnExpression) {
     SourceLocation ELoc = Tok.getLocation();
     ExprResult LHS(

diff  --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 256f9521b3a7e..465dab2b65eb1 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -16532,6 +16532,7 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPSingleExprClause(OpenMPClauseKind Kind,
   case OMPC_holds:
     Res = ActOnOpenMPHoldsClause(Expr, StartLoc, LParenLoc, EndLoc);
     break;
+  case OMPC_dyn_groupprivate:
   case OMPC_grainsize:
   case OMPC_num_tasks:
   case OMPC_num_threads:
@@ -16658,6 +16659,8 @@ static OpenMPDirectiveKind 
getOpenMPCaptureRegionForClause(
   case OMPC_num_teams:
   case OMPC_thread_limit:
   case OMPC_ompx_dyn_cgroup_mem:
+  case OMPC_dyn_groupprivate:
+    // TODO: This may need to consider teams too.
     if (Leafs[0] == OMPD_target)
       return OMPD_target;
     break;
@@ -17705,7 +17708,7 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPSingleExprWithArgClause(
     SourceLocation EndLoc) {
   OMPClause *Res = nullptr;
   switch (Kind) {
-  case OMPC_schedule:
+  case OMPC_schedule: {
     enum { Modifier1, Modifier2, ScheduleKind, NumberOfElements };
     assert(Argument.size() == NumberOfElements &&
            ArgumentLoc.size() == NumberOfElements);
@@ -17716,6 +17719,7 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPSingleExprWithArgClause(
         StartLoc, LParenLoc, ArgumentLoc[Modifier1], ArgumentLoc[Modifier2],
         ArgumentLoc[ScheduleKind], DelimLoc, EndLoc);
     break;
+  }
   case OMPC_if:
     assert(Argument.size() == 1 && ArgumentLoc.size() == 1);
     Res = 
ActOnOpenMPIfClause(static_cast<OpenMPDirectiveKind>(Argument.back()),
@@ -17771,6 +17775,20 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPSingleExprWithArgClause(
         static_cast<OpenMPNumTasksClauseModifier>(Argument.back()), Expr,
         StartLoc, LParenLoc, ArgumentLoc.back(), EndLoc);
     break;
+  case OMPC_dyn_groupprivate: {
+    enum { Modifier1, Modifier2, NumberOfElements };
+    assert(Argument.size() == NumberOfElements &&
+           ArgumentLoc.size() == NumberOfElements &&
+           "Modifiers for dyn_groupprivate clause and their locations are "
+           "expected.");
+    Res = ActOnOpenMPDynGroupprivateClause(
+        static_cast<OpenMPDynGroupprivateClauseModifier>(Argument[Modifier1]),
+        static_cast<OpenMPDynGroupprivateClauseFallbackModifier>(
+            Argument[Modifier2]),
+        Expr, StartLoc, LParenLoc, ArgumentLoc[Modifier1],
+        ArgumentLoc[Modifier2], EndLoc);
+    break;
+  }
   case OMPC_num_threads:
     assert(Argument.size() == 1 && ArgumentLoc.size() == 1 &&
            "Modifier for num_threads clause and its location are expected.");
@@ -18127,6 +18145,7 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPClause(OpenMPClauseKind Kind,
   case OMPC_affinity:
   case OMPC_when:
   case OMPC_ompx_dyn_cgroup_mem:
+  case OMPC_dyn_groupprivate:
   default:
     llvm_unreachable("Clause is not allowed.");
   }
@@ -25246,6 +25265,49 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPXDynCGroupMemClause(Expr *Size,
       ValExpr, HelperValStmt, CaptureRegion, StartLoc, LParenLoc, EndLoc);
 }
 
+OMPClause *SemaOpenMP::ActOnOpenMPDynGroupprivateClause(
+    OpenMPDynGroupprivateClauseModifier M1,
+    OpenMPDynGroupprivateClauseFallbackModifier M2, Expr *Size,
+    SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation M1Loc,
+    SourceLocation M2Loc, SourceLocation EndLoc) {
+
+  if ((M1Loc.isValid() && M1 == OMPC_DYN_GROUPPRIVATE_unknown) ||
+      (M2Loc.isValid() && M2 == OMPC_DYN_GROUPPRIVATE_FALLBACK_unknown)) {
+    std::string Values = getListOfPossibleValues(
+        OMPC_dyn_groupprivate, /*First=*/0, OMPC_DYN_GROUPPRIVATE_unknown);
+    Diag((M1Loc.isValid() && M1 == OMPC_DYN_GROUPPRIVATE_unknown) ? M1Loc
+                                                                  : M2Loc,
+         diag::err_omp_unexpected_clause_value)
+        << Values << getOpenMPClauseName(OMPC_dyn_groupprivate);
+    return nullptr;
+  }
+
+  Expr *ValExpr = Size;
+  Stmt *HelperValStmt = nullptr;
+
+  // OpenMP [2.5, Restrictions]
+  //  The dyn_groupprivate expression must evaluate to a positive integer
+  //  value.
+  if (!isNonNegativeIntegerValue(ValExpr, SemaRef, OMPC_dyn_groupprivate,
+                                 /*StrictlyPositive=*/false))
+    return nullptr;
+
+  OpenMPDirectiveKind DKind = DSAStack->getCurrentDirective();
+  OpenMPDirectiveKind CaptureRegion = getOpenMPCaptureRegionForClause(
+      DKind, OMPC_dyn_groupprivate, getLangOpts().OpenMP);
+  if (CaptureRegion != OMPD_unknown &&
+      !SemaRef.CurContext->isDependentContext()) {
+    ValExpr = SemaRef.MakeFullExpr(ValExpr).get();
+    llvm::MapVector<const Expr *, DeclRefExpr *> Captures;
+    ValExpr = tryBuildCapture(SemaRef, ValExpr, Captures).get();
+    HelperValStmt = buildPreInits(getASTContext(), Captures);
+  }
+
+  return new (getASTContext()) OMPDynGroupprivateClause(
+      StartLoc, LParenLoc, EndLoc, ValExpr, HelperValStmt, CaptureRegion, M1,
+      M1Loc, M2, M2Loc);
+}
+
 OMPClause *SemaOpenMP::ActOnOpenMPDoacrossClause(
     OpenMPDoacrossClauseModifier DepType, SourceLocation DepLoc,
     SourceLocation ColonLoc, ArrayRef<Expr *> VarList, SourceLocation StartLoc,

diff  --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 94105f10d71b5..c2491489f40d2 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -2463,6 +2463,19 @@ class TreeTransform {
                                                              LParenLoc, 
EndLoc);
   }
 
+  /// Build a new OpenMP 'dyn_groupprivate' clause.
+  ///
+  /// By default, performs semantic analysis to build the new OpenMP clause.
+  /// Subclasses may override this routine to provide 
diff erent behavior.
+  OMPClause *RebuildOMPDynGroupprivateClause(
+      OpenMPDynGroupprivateClauseModifier M1,
+      OpenMPDynGroupprivateClauseFallbackModifier M2, Expr *Size,
+      SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation M1Loc,
+      SourceLocation M2Loc, SourceLocation EndLoc) {
+    return getSema().OpenMP().ActOnOpenMPDynGroupprivateClause(
+        M1, M2, Size, StartLoc, LParenLoc, M1Loc, M2Loc, EndLoc);
+  }
+
   /// Build a new OpenMP 'ompx_attribute' clause.
   ///
   /// By default, performs semantic analysis to build the new OpenMP clause.
@@ -11725,6 +11738,19 @@ OMPClause 
*TreeTransform<Derived>::TransformOMPXDynCGroupMemClause(
       Size.get(), C->getBeginLoc(), C->getLParenLoc(), C->getEndLoc());
 }
 
+template <typename Derived>
+OMPClause *TreeTransform<Derived>::TransformOMPDynGroupprivateClause(
+    OMPDynGroupprivateClause *C) {
+  ExprResult Size = getDerived().TransformExpr(C->getSize());
+  if (Size.isInvalid())
+    return nullptr;
+  return getDerived().RebuildOMPDynGroupprivateClause(
+      C->getDynGroupprivateModifier(), C->getDynGroupprivateFallbackModifier(),
+      Size.get(), C->getBeginLoc(), C->getLParenLoc(),
+      C->getDynGroupprivateModifierLoc(),
+      C->getDynGroupprivateFallbackModifierLoc(), C->getEndLoc());
+}
+
 template <typename Derived>
 OMPClause *
 TreeTransform<Derived>::TransformOMPDoacrossClause(OMPDoacrossClause *C) {

diff  --git a/clang/lib/Serialization/ASTReader.cpp 
b/clang/lib/Serialization/ASTReader.cpp
index d5528219bb7d5..a04041c10b4ba 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -11544,6 +11544,9 @@ OMPClause *OMPClauseReader::readClause() {
   case llvm::omp::OMPC_ompx_dyn_cgroup_mem:
     C = new (Context) OMPXDynCGroupMemClause();
     break;
+  case llvm::omp::OMPC_dyn_groupprivate:
+    C = new (Context) OMPDynGroupprivateClause();
+    break;
   case llvm::omp::OMPC_doacross: {
     unsigned NumVars = Record.readInt();
     unsigned NumLoops = Record.readInt();
@@ -12736,6 +12739,19 @@ void 
OMPClauseReader::VisitOMPXDynCGroupMemClause(OMPXDynCGroupMemClause *C) {
   C->setLParenLoc(Record.readSourceLocation());
 }
 
+void OMPClauseReader::VisitOMPDynGroupprivateClause(
+    OMPDynGroupprivateClause *C) {
+  VisitOMPClauseWithPreInit(C);
+  C->setDynGroupprivateModifier(
+      Record.readEnum<OpenMPDynGroupprivateClauseModifier>());
+  C->setDynGroupprivateFallbackModifier(
+      Record.readEnum<OpenMPDynGroupprivateClauseFallbackModifier>());
+  C->setSize(Record.readSubExpr());
+  C->setLParenLoc(Record.readSourceLocation());
+  C->setDynGroupprivateModifierLoc(Record.readSourceLocation());
+  C->setDynGroupprivateFallbackModifierLoc(Record.readSourceLocation());
+}
+
 void OMPClauseReader::VisitOMPDoacrossClause(OMPDoacrossClause *C) {
   C->setLParenLoc(Record.readSourceLocation());
   C->setDependenceType(

diff  --git a/clang/lib/Serialization/ASTWriter.cpp 
b/clang/lib/Serialization/ASTWriter.cpp
index b1fd151790d96..821e7df1bce53 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -8651,6 +8651,17 @@ void 
OMPClauseWriter::VisitOMPXDynCGroupMemClause(OMPXDynCGroupMemClause *C) {
   Record.AddSourceLocation(C->getLParenLoc());
 }
 
+void OMPClauseWriter::VisitOMPDynGroupprivateClause(
+    OMPDynGroupprivateClause *C) {
+  VisitOMPClauseWithPreInit(C);
+  Record.push_back(C->getDynGroupprivateModifier());
+  Record.push_back(C->getDynGroupprivateFallbackModifier());
+  Record.AddStmt(C->getSize());
+  Record.AddSourceLocation(C->getLParenLoc());
+  Record.AddSourceLocation(C->getDynGroupprivateModifierLoc());
+  Record.AddSourceLocation(C->getDynGroupprivateFallbackModifierLoc());
+}
+
 void OMPClauseWriter::VisitOMPDoacrossClause(OMPDoacrossClause *C) {
   Record.push_back(C->varlist_size());
   Record.push_back(C->getNumLoops());

diff  --git a/clang/test/OpenMP/target_dyn_groupprivate_messages.cpp 
b/clang/test/OpenMP/target_dyn_groupprivate_messages.cpp
new file mode 100644
index 0000000000000..385bd5e89829d
--- /dev/null
+++ b/clang/test/OpenMP/target_dyn_groupprivate_messages.cpp
@@ -0,0 +1,89 @@
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=61 %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp-simd -fopenmp-version=61 %s -Wuninitialized
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note {{declared here}}
+
+template <class T, class S> // expected-note {{declared here}}
+int tmain(T argc, S **argv) {
+  T z;
+  #pragma omp target dyn_groupprivate // expected-error {{expected '(' after 
'dyn_groupprivate'}}
+  foo();
+  #pragma omp target dyn_groupprivate ( // expected-error {{expected 
expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate () // expected-error {{expected 
expression}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc // expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc)) // expected-warning {{extra 
tokens at the end of '#pragma omp target' are ignored}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc > 0 ? argv[1] : argv[2]) // 
expected-error {{expression must have integral or unscoped enumeration type, 
not 'char *'}}
+  foo();
+  #pragma omp target dyn_groupprivate (foobool(argc)), dyn_groupprivate (true) 
// expected-error {{directive '#pragma omp target' cannot contain more than one 
'dyn_groupprivate' clause}}
+  foo();
+  #pragma omp target dyn_groupprivate (S) // expected-error {{'S' does not 
refer to a value}}
+  foo();
+  #pragma omp target dyn_groupprivate (argv[1]=2) // expected-error 
{{expression must have integral or unscoped enumeration type, not 'char *'}} 
expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc argc) // expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate(argc+z)
+  foo();
+  return 0;
+}
+
+int main(int argc, char **argv) {
+constexpr int n = -1;
+int z;
+  #pragma omp target dyn_groupprivate // expected-error {{expected '(' after 
'dyn_groupprivate'}}
+  foo();
+  #pragma omp target dyn_groupprivate ( // expected-error {{expected 
expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate () // expected-error {{expected 
expression}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc // expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc)) // expected-warning {{extra 
tokens at the end of '#pragma omp target' are ignored}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc > 0 ? argv[1] : argv[2]) // 
expected-error {{expression must have integral or unscoped enumeration type, 
not 'char *'}}
+  foo();
+  #pragma omp target dyn_groupprivate (foobool(argc)), dyn_groupprivate (true) 
// expected-error {{directive '#pragma omp target' cannot contain more than one 
'dyn_groupprivate' clause}}
+  foo();
+  #pragma omp target dyn_groupprivate (S1) // expected-error {{'S1' does not 
refer to a value}}
+  foo();
+  #pragma omp target dyn_groupprivate (argv[1]=2) // expected-error 
{{expression must have integral or unscoped enumeration type, not 'char *'}} 
expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate (argc argc) // expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate (1 0) // expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate(dyn_groupprivate(tmain(argc, argv) // 
expected-error2 {{expected ')'}} expected-note2 {{to match this '('}} 
expected-note {{in instantiation of function template specialization 
'tmain<int, char>' requested here}}
+  foo();
+  #pragma omp target dyn_groupprivate(-1) // expected-error {{argument to 
'dyn_groupprivate' clause must be a non-negative integer value}}
+  foo();
+  #pragma omp target dyn_groupprivate(cgrou) // expected-error {{use of 
undeclared identifier 'cgrou'}}
+  foo();
+  #pragma omp target dyn_groupprivate(cgrou: argc) // expected-error {{use of 
undeclared identifier 'cgrou'}} expected-error {{expected ')'}} expected-note 
{{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate(cgroup,cgroup: argc) // expected-error 
{{modifier 'cgroup' cannot be used along with modifier 'cgroup' in 
dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(default_mem),fallback(abort): 
argc) // expected-error {{modifier 'fallback(abort)' cannot be used along with 
modifier 'fallback(default_mem)' in dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(abort),fallback(null): argc) // 
expected-error {{modifier 'fallback(null)' cannot be used along with modifier 
'fallback(abort)' in dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(cgroup): argc) // 
expected-error {{expected 'abort', 'null' or 'default_mem' in fallback 
modifier}} expected-error {{expected expression}} expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(): argc) // expected-error 
{{expected 'abort', 'null' or 'default_mem' in fallback modifier}} 
expected-error {{expected expression}} expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate(: argc) // expected-error {{expected 
')'}} expected-error {{expected expression}} expected-note {{to match this '('}}
+  foo();
+
+  return tmain(argc, argv);
+}
+

diff  --git a/clang/test/OpenMP/target_teams_dyn_groupprivate_messages.cpp 
b/clang/test/OpenMP/target_teams_dyn_groupprivate_messages.cpp
new file mode 100644
index 0000000000000..ac2cc0dde5073
--- /dev/null
+++ b/clang/test/OpenMP/target_teams_dyn_groupprivate_messages.cpp
@@ -0,0 +1,89 @@
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=61 %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp-simd -fopenmp-version=61 %s -Wuninitialized
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note {{declared here}}
+
+template <class T, class S> // expected-note {{declared here}}
+int tmain(T argc, S **argv) {
+  T z;
+  #pragma omp target teams dyn_groupprivate // expected-error {{expected '(' 
after 'dyn_groupprivate'}}
+  foo();
+  #pragma omp target teams dyn_groupprivate ( // expected-error {{expected 
expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate () // expected-error {{expected 
expression}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc // expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc)) // expected-warning 
{{extra tokens at the end of '#pragma omp target teams' are ignored}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc > 0 ? argv[1] : argv[2]) // 
expected-error {{expression must have integral or unscoped enumeration type, 
not 'char *'}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (foobool(argc)), dyn_groupprivate 
(true) // expected-error {{directive '#pragma omp target teams' cannot contain 
more than one 'dyn_groupprivate' clause}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (S) // expected-error {{'S' does 
not refer to a value}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argv[1]=2) // expected-error 
{{expression must have integral or unscoped enumeration type, not 'char *'}} 
expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc argc) // expected-error 
{{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate(argc+z)
+  foo();
+  return 0;
+}
+
+int main(int argc, char **argv) {
+constexpr int n = -1;
+int z;
+  #pragma omp target teams dyn_groupprivate // expected-error {{expected '(' 
after 'dyn_groupprivate'}}
+  foo();
+  #pragma omp target teams dyn_groupprivate ( // expected-error {{expected 
expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate () // expected-error {{expected 
expression}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc // expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc)) // expected-warning 
{{extra tokens at the end of '#pragma omp target teams' are ignored}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc > 0 ? argv[1] : argv[2]) // 
expected-error {{expression must have integral or unscoped enumeration type, 
not 'char *'}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (foobool(argc)), dyn_groupprivate 
(true) // expected-error {{directive '#pragma omp target teams' cannot contain 
more than one 'dyn_groupprivate' clause}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (S1) // expected-error {{'S1' does 
not refer to a value}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argv[1]=2) // expected-error 
{{expression must have integral or unscoped enumeration type, not 'char *'}} 
expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (argc argc) // expected-error 
{{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate (1 0) // expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate(dyn_groupprivate(tmain(argc, argv) 
// expected-error2 {{expected ')'}} expected-note2 {{to match this '('}} 
expected-note {{in instantiation of function template specialization 
'tmain<int, char>' requested here}}
+  foo();
+  #pragma omp target teams dyn_groupprivate(-1) // expected-error {{argument 
to 'dyn_groupprivate' clause must be a non-negative integer value}}
+  foo();
+  #pragma omp target teams dyn_groupprivate(cgrou) // expected-error {{use of 
undeclared identifier 'cgrou'}}
+  foo();
+  #pragma omp target teams dyn_groupprivate(cgrou: argc) // expected-error 
{{use of undeclared identifier 'cgrou'}} expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate(cgroup,cgroup: argc) // 
expected-error {{modifier 'cgroup' cannot be used along with modifier 'cgroup' 
in dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(default_mem),fallback(abort): 
argc) // expected-error {{modifier 'fallback(abort)' cannot be used along with 
modifier 'fallback(default_mem)' in dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(abort),fallback(null): argc) // 
expected-error {{modifier 'fallback(null)' cannot be used along with modifier 
'fallback(abort)' in dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(cgroup): argc) // 
expected-error {{expected 'abort', 'null' or 'default_mem' in fallback 
modifier}} expected-error {{expected expression}} expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(): argc) // expected-error 
{{expected 'abort', 'null' or 'default_mem' in fallback modifier}} 
expected-error {{expected expression}} expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp target teams dyn_groupprivate(: argc) // expected-error 
{{expected ')'}} expected-error {{expected expression}} expected-note {{to 
match this '('}}
+  foo();
+
+  return tmain(argc, argv);
+}
+

diff  --git a/clang/test/OpenMP/teams_dyn_groupprivate_messages.cpp 
b/clang/test/OpenMP/teams_dyn_groupprivate_messages.cpp
new file mode 100644
index 0000000000000..701ebfb43eec6
--- /dev/null
+++ b/clang/test/OpenMP/teams_dyn_groupprivate_messages.cpp
@@ -0,0 +1,89 @@
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=61 %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp-simd -fopenmp-version=61 %s -Wuninitialized
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note {{declared here}}
+
+template <class T, class S> // expected-note {{declared here}}
+int tmain(T argc, S **argv) {
+  T z;
+  #pragma omp teams dyn_groupprivate // expected-error {{expected '(' after 
'dyn_groupprivate'}}
+  foo();
+  #pragma omp teams dyn_groupprivate ( // expected-error {{expected 
expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate () // expected-error {{expected 
expression}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc // expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc)) // expected-warning {{extra 
tokens at the end of '#pragma omp teams' are ignored}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc > 0 ? argv[1] : argv[2]) // 
expected-error {{expression must have integral or unscoped enumeration type, 
not 'char *'}}
+  foo();
+  #pragma omp teams dyn_groupprivate (foobool(argc)), dyn_groupprivate (true) 
// expected-error {{directive '#pragma omp teams' cannot contain more than one 
'dyn_groupprivate' clause}}
+  foo();
+  #pragma omp teams dyn_groupprivate (S) // expected-error {{'S' does not 
refer to a value}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argv[1]=2) // expected-error 
{{expression must have integral or unscoped enumeration type, not 'char *'}} 
expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc argc) // expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate(argc+z)
+  foo();
+  return 0;
+}
+
+int main(int argc, char **argv) {
+constexpr int n = -1;
+int z;
+  #pragma omp teams dyn_groupprivate // expected-error {{expected '(' after 
'dyn_groupprivate'}}
+  foo();
+  #pragma omp teams dyn_groupprivate ( // expected-error {{expected 
expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate () // expected-error {{expected 
expression}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc // expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc)) // expected-warning {{extra 
tokens at the end of '#pragma omp teams' are ignored}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc > 0 ? argv[1] : argv[2]) // 
expected-error {{expression must have integral or unscoped enumeration type, 
not 'char *'}}
+  foo();
+  #pragma omp teams dyn_groupprivate (foobool(argc)), dyn_groupprivate (true) 
// expected-error {{directive '#pragma omp teams' cannot contain more than one 
'dyn_groupprivate' clause}}
+  foo();
+  #pragma omp teams dyn_groupprivate (S1) // expected-error {{'S1' does not 
refer to a value}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argv[1]=2) // expected-error 
{{expression must have integral or unscoped enumeration type, not 'char *'}} 
expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate (argc argc) // expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate (1 0) // expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate(dyn_groupprivate(tmain(argc, argv) // 
expected-error2 {{expected ')'}} expected-note2 {{to match this '('}} 
expected-note {{in instantiation of function template specialization 
'tmain<int, char>' requested here}}
+  foo();
+  #pragma omp teams dyn_groupprivate(-1) // expected-error {{argument to 
'dyn_groupprivate' clause must be a non-negative integer value}}
+  foo();
+  #pragma omp teams dyn_groupprivate(cgrou) // expected-error {{use of 
undeclared identifier 'cgrou'}}
+  foo();
+  #pragma omp teams dyn_groupprivate(cgrou: argc) // expected-error {{use of 
undeclared identifier 'cgrou'}} expected-error {{expected ')'}} expected-note 
{{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate(cgroup,cgroup: argc) // expected-error 
{{modifier 'cgroup' cannot be used along with modifier 'cgroup' in 
dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(default_mem),fallback(abort): 
argc) // expected-error {{modifier 'fallback(abort)' cannot be used along with 
modifier 'fallback(default_mem)' in dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(abort),fallback(null): argc) // 
expected-error {{modifier 'fallback(null)' cannot be used along with modifier 
'fallback(abort)' in dyn_groupprivate}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(cgroup): argc) // 
expected-error {{expected 'abort', 'null' or 'default_mem' in fallback 
modifier}} expected-error {{expected expression}} expected-error {{expected 
')'}} expected-note {{to match this '('}}
+  foo();
+  #pragma omp target dyn_groupprivate(fallback(): argc) // expected-error 
{{expected 'abort', 'null' or 'default_mem' in fallback modifier}} 
expected-error {{expected expression}} expected-error {{expected ')'}} 
expected-note {{to match this '('}}
+  foo();
+  #pragma omp teams dyn_groupprivate(: argc) // expected-error {{expected 
')'}} expected-error {{expected expression}} expected-note {{to match this '('}}
+  foo();
+
+  return tmain(argc, argv);
+}
+

diff  --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 08776d9bcabfc..f4d6fa72a1dfe 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2757,6 +2757,11 @@ void OMPClauseEnqueue::VisitOMPXDynCGroupMemClause(
   VisitOMPClauseWithPreInit(C);
   Visitor->AddStmt(C->getSize());
 }
+void OMPClauseEnqueue::VisitOMPDynGroupprivateClause(
+    const OMPDynGroupprivateClause *C) {
+  VisitOMPClauseWithPreInit(C);
+  Visitor->AddStmt(C->getSize());
+}
 void OMPClauseEnqueue::VisitOMPDoacrossClause(const OMPDoacrossClause *C) {
   VisitOMPClauseList(C);
 }

diff  --git a/llvm/include/llvm/Frontend/OpenMP/OMP.td 
b/llvm/include/llvm/Frontend/OpenMP/OMP.td
index bebab9ba63488..a01858fb220f1 100644
--- a/llvm/include/llvm/Frontend/OpenMP/OMP.td
+++ b/llvm/include/llvm/Frontend/OpenMP/OMP.td
@@ -187,6 +187,7 @@ def OMPC_DynamicAllocators : 
Clause<[Spelling<"dynamic_allocators">]> {
   let isValueOptional = true;
 }
 def OMPC_DynGroupprivate : Clause<[Spelling<"dyn_groupprivate">]> {
+  let clangClass = "OMPDynGroupprivateClause";
   let flangClass = "OmpDynGroupprivateClause";
 }
 def OMPC_Enter : Clause<[Spelling<"enter">]> {

diff  --git a/llvm/unittests/Frontend/OpenMPDecompositionTest.cpp 
b/llvm/unittests/Frontend/OpenMPDecompositionTest.cpp
index a8706ceac141f..e0c6b3904310c 100644
--- a/llvm/unittests/Frontend/OpenMPDecompositionTest.cpp
+++ b/llvm/unittests/Frontend/OpenMPDecompositionTest.cpp
@@ -88,6 +88,7 @@ using DistSchedule = tomp::clause::DistScheduleT<TypeTy, 
IdTy, ExprTy>;
 using Doacross = tomp::clause::DoacrossT<TypeTy, IdTy, ExprTy>;
 using DynamicAllocators =
     tomp::clause::DynamicAllocatorsT<TypeTy, IdTy, ExprTy>;
+using DynGroupprivate = tomp::clause::DynGroupprivateT<TypeTy, IdTy, ExprTy>;
 using Enter = tomp::clause::EnterT<TypeTy, IdTy, ExprTy>;
 using Exclusive = tomp::clause::ExclusiveT<TypeTy, IdTy, ExprTy>;
 using Fail = tomp::clause::FailT<TypeTy, IdTy, ExprTy>;


        
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