diff --git a/llvm/include/llvm/TextAPI/InterfaceFile.h b/llvm/include/llvm/TextAPI/InterfaceFile.h
index ae2bf78403f4f1..d5e3e7e4c0a7c3 100644
--- a/llvm/include/llvm/TextAPI/InterfaceFile.h
+++ b/llvm/include/llvm/TextAPI/InterfaceFile.h
@@ -248,6 +248,14 @@ class InterfaceFile {
   /// Check if the library uses two-level namespace.
   bool isTwoLevelNamespace() const { return IsTwoLevelNamespace; }
 
+  /// Specify if the library is an OS library but not shared cache eligible.
+  void setOSLibNotForSharedCache(bool V = true) {
+    IsOSLibNotForSharedCache = V;
+  }
+
+  /// Check if the library is an OS library that is not shared cache eligible.
+  bool isOSLibNotForSharedCache() const { return IsOSLibNotForSharedCache; }
+
   /// Specify if the library is application extension safe (or not).
   void setApplicationExtensionSafe(bool V = true) { IsAppExtensionSafe = V; }
 
@@ -455,6 +463,7 @@ class InterfaceFile {
   PackedVersion CompatibilityVersion;
   uint8_t SwiftABIVersion{0};
   bool IsTwoLevelNamespace{false};
+  bool IsOSLibNotForSharedCache{false};
   bool IsAppExtensionSafe{false};
   bool HasSimSupport{false};
   ObjCConstraintType ObjcConstraint = ObjCConstraintType::None;
diff --git a/llvm/lib/TextAPI/InterfaceFile.cpp b/llvm/lib/TextAPI/InterfaceFile.cpp
index f1c6add67b97b9..3689ab9191915a 100644
--- a/llvm/lib/TextAPI/InterfaceFile.cpp
+++ b/llvm/lib/TextAPI/InterfaceFile.cpp
@@ -361,6 +361,8 @@ bool InterfaceFile::operator==(const InterfaceFile &O) const {
     return false;
   if (IsAppExtensionSafe != O.IsAppExtensionSafe)
     return false;
+  if (IsOSLibNotForSharedCache != O.IsOSLibNotForSharedCache)
+    return false;
   if (HasSimSupport != O.HasSimSupport)
     return false;
   if (ParentUmbrellas != O.ParentUmbrellas)
diff --git a/llvm/lib/TextAPI/TextStub.cpp b/llvm/lib/TextAPI/TextStub.cpp
index cbb185fd51c5dc..635f6b3a3df6dd 100644
--- a/llvm/lib/TextAPI/TextStub.cpp
+++ b/llvm/lib/TextAPI/TextStub.cpp
@@ -360,6 +360,8 @@ template <> struct ScalarBitSetTraits<TBDFlags> {
     IO.bitSetCase(Flags, "not_app_extension_safe",
                   TBDFlags::NotApplicationExtensionSafe);
     IO.bitSetCase(Flags, "installapi", TBDFlags::InstallAPI);
+    IO.bitSetCase(Flags, "not_for_dyld_shared_cache",
+                  TBDFlags::OSLibNotForSharedCache);
   }
 };
 
@@ -782,6 +784,9 @@ template <> struct MappingTraits<const InterfaceFile *> {
       if (!File->isTwoLevelNamespace())
         Flags |= TBDFlags::FlatNamespace;
 
+      if (File->isOSLibNotForSharedCache())
+        Flags |= TBDFlags::OSLibNotForSharedCache;
+
       {
         std::map<std::string, TargetList> valueToTargetList;
         for (const auto &it : File->umbrellas())
@@ -872,6 +877,8 @@ template <> struct MappingTraits<const InterfaceFile *> {
       File->setTwoLevelNamespace(!(Flags & TBDFlags::FlatNamespace));
       File->setApplicationExtensionSafe(
           !(Flags & TBDFlags::NotApplicationExtensionSafe));
+      File->setOSLibNotForSharedCache(
+          (Flags & TBDFlags::OSLibNotForSharedCache));
 
       for (const auto &CurrentSection : AllowableClients) {
         for (const auto &lib : CurrentSection.Values)
diff --git a/llvm/lib/TextAPI/TextStubCommon.h b/llvm/lib/TextAPI/TextStubCommon.h
index 5faba09fa1bbff..360910c48d4fe5 100644
--- a/llvm/lib/TextAPI/TextStubCommon.h
+++ b/llvm/lib/TextAPI/TextStubCommon.h
@@ -29,7 +29,8 @@ enum TBDFlags : unsigned {
   NotApplicationExtensionSafe  = 1U << 1,
   InstallAPI                   = 1U << 2,
   SimulatorSupport             = 1U << 3,
-  LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/SimulatorSupport),
+  OSLibNotForSharedCache       = 1U << 4,
+  LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/OSLibNotForSharedCache),
 };
 // clang-format on
 
diff --git a/llvm/lib/TextAPI/TextStubV5.cpp b/llvm/lib/TextAPI/TextStubV5.cpp
index f6a3fef088e464..3546c699bce0ea 100644
--- a/llvm/lib/TextAPI/TextStubV5.cpp
+++ b/llvm/lib/TextAPI/TextStubV5.cpp
@@ -564,6 +564,8 @@ Expected<TBDFlags> getFlags(const Object *File) {
                   .Case("not_app_extension_safe",
                         TBDFlags::NotApplicationExtensionSafe)
                   .Case("sim_support", TBDFlags::SimulatorSupport)
+                  .Case("not_for_dyld_shared_cache",
+                        TBDFlags::OSLibNotForSharedCache)
                   .Default(TBDFlags::None);
           Flags |= TBDFlag;
         });
@@ -655,6 +657,7 @@ Expected<IFPtr> parseToInterfaceFile(const Object *File) {
   F->setApplicationExtensionSafe(
       !(Flags & TBDFlags::NotApplicationExtensionSafe));
   F->setSimulatorSupport((Flags & TBDFlags::SimulatorSupport));
+  F->setOSLibNotForSharedCache((Flags & TBDFlags::OSLibNotForSharedCache));
   for (auto &T : Targets)
     F->addTarget(T);
   for (auto &[Lib, Targets] : Clients)
@@ -923,6 +926,8 @@ Array serializeFlags(const InterfaceFile *File) {
     Flags.emplace_back("not_app_extension_safe");
   if (File->hasSimulatorSupport())
     Flags.emplace_back("sim_support");
+  if (File->isOSLibNotForSharedCache())
+    Flags.emplace_back("not_for_dyld_shared_cache");
   return serializeScalar(TBDKey::Attributes, std::move(Flags));
 }
 
diff --git a/llvm/test/tools/llvm-readtapi/compare-flags.test b/llvm/test/tools/llvm-readtapi/compare-flags.test
new file mode 100644
index 00000000000000..06184eeb7661e1
--- /dev/null
+++ b/llvm/test/tools/llvm-readtapi/compare-flags.test
@@ -0,0 +1,49 @@
+; RUN: rm -rf %t
+; RUN: split-file %s %t  
+; RUN: not llvm-readtapi --compare %t/tbdv4.tbd  %t/tbdv5.tbd 2>&1 | FileCheck %s 
+
+; CHECK: < {{.*}}tbdv4.tbd
+; CHECK: > {{.*}}tbdv5.tbd
+
+CHECK:      Two Level Namespace
+CHECK-NEXT:         < true
+CHECK-NEXT:         > false
+CHECK-NEXT: Shared Cache Ineligible
+CHECK-NEXT:         < true
+CHECK-NEXT:         > false
+
+
+//--- tbdv4.tbd
+--- !tapi-tbd
+tbd-version:     4
+targets:         [ arm64-macos ]
+flags:           [ not_app_extension_safe, not_for_dyld_shared_cache ]
+install-name:    '/usr/lib/libFake.dylib'
+...
+
+//--- tbdv5.tbd
+{
+    "main_library": {
+        "flags": [
+            {
+                "attributes": [
+                    "not_app_extension_safe",
+                    "flat_namespace"
+                ]
+            }
+        ],
+        "install_names": [
+            {
+                "name": "/usr/lib/libFake.dylib"
+            }
+        ],
+        "target_info": [
+            {
+                "min_deployment": "13",
+                "target": "arm64-macos"
+            }
+        ]
+    },
+    "tapi_tbd_version": 5
+}
+
diff --git a/llvm/tools/llvm-readtapi/DiffEngine.cpp b/llvm/tools/llvm-readtapi/DiffEngine.cpp
index 0dd0d91616b135..5f4b25ca6c0b2d 100644
--- a/llvm/tools/llvm-readtapi/DiffEngine.cpp
+++ b/llvm/tools/llvm-readtapi/DiffEngine.cpp
@@ -370,6 +370,14 @@ DiffEngine::findDifferences(const InterfaceFile *IFLHS,
                                            rhs, IFRHS->hasSimulatorSupport()),
                                        "Simulator Support"));
 
+  if (IFLHS->isOSLibNotForSharedCache() != IFRHS->isOSLibNotForSharedCache())
+    Output.push_back(
+        recordDifferences(DiffScalarVal<bool, AD_Diff_Scalar_Bool>(
+                              lhs, IFLHS->isOSLibNotForSharedCache()),
+                          DiffScalarVal<bool, AD_Diff_Scalar_Bool>(
+                              rhs, IFRHS->isOSLibNotForSharedCache()),
+                          "Shared Cache Ineligible"));
+
   if (IFLHS->reexportedLibraries() != IFRHS->reexportedLibraries())
     Output.push_back(recordDifferences(IFLHS->reexportedLibraries(),
                                        IFRHS->reexportedLibraries(),
diff --git a/llvm/unittests/TextAPI/TextStubV4Tests.cpp b/llvm/unittests/TextAPI/TextStubV4Tests.cpp
index 43b3c4adadbddd..2fefd7910a70c2 100644
--- a/llvm/unittests/TextAPI/TextStubV4Tests.cpp
+++ b/llvm/unittests/TextAPI/TextStubV4Tests.cpp
@@ -100,6 +100,7 @@ TEST(TBDv4, ReadFile) {
   EXPECT_EQ(5U, File->getSwiftABIVersion());
   EXPECT_FALSE(File->isTwoLevelNamespace());
   EXPECT_TRUE(File->isApplicationExtensionSafe());
+  EXPECT_FALSE(File->isOSLibNotForSharedCache());
   InterfaceFileRef client("ClientA", Targets);
   InterfaceFileRef reexport("/System/Library/Frameworks/A.framework/A",
                             {Targets[0]});
@@ -832,6 +833,29 @@ TEST(TBDv4, Swift_99) {
             stripWhitespace(Buffer.c_str()));
 }
 
+TEST(TBDv4, NotForSharedCache) {
+
+  static const char TBDv4NotForSharedCache[] =
+      "--- !tapi-tbd\n"
+      "tbd-version: 4\n"
+      "targets: [  arm64-macos ]\n"
+      "flags: [ not_for_dyld_shared_cache ]\n"
+      "install-name: /S/L/F/Foo.framework/Foo\n"
+      "...\n";
+
+  Expected<TBDFile> Result =
+      TextAPIReader::get(MemoryBufferRef(TBDv4NotForSharedCache, "Test.tbd"));
+  EXPECT_TRUE(!!Result);
+  Target ExpectedTarget = Target(AK_arm64, PLATFORM_MACOS);
+  TBDFile ReadFile = std::move(Result.get());
+  EXPECT_EQ(FileType::TBD_V4, ReadFile->getFileType());
+  EXPECT_EQ(std::string("/S/L/F/Foo.framework/Foo"),
+            ReadFile->getInstallName());
+  EXPECT_TRUE(ReadFile->targets().begin() != ReadFile->targets().end());
+  EXPECT_EQ(*ReadFile->targets().begin(), ExpectedTarget);
+  EXPECT_TRUE(ReadFile->isOSLibNotForSharedCache());
+}
+
 TEST(TBDv4, InvalidArchitecture) {
   static const char TBDv4UnknownArch[] = "--- !tapi-tbd\n"
                                          "tbd-version: 4\n"
diff --git a/llvm/unittests/TextAPI/TextStubV5Tests.cpp b/llvm/unittests/TextAPI/TextStubV5Tests.cpp
index 60976a5f064818..ac979a81bfc348 100644
--- a/llvm/unittests/TextAPI/TextStubV5Tests.cpp
+++ b/llvm/unittests/TextAPI/TextStubV5Tests.cpp
@@ -218,6 +218,7 @@ TEST(TBDv5, ReadFile) {
   EXPECT_EQ(PackedVersion(1, 1, 0), File->getCompatibilityVersion());
   EXPECT_TRUE(File->isApplicationExtensionSafe());
   EXPECT_FALSE(File->isTwoLevelNamespace());
+  EXPECT_FALSE(File->isOSLibNotForSharedCache());
   EXPECT_EQ(0U, File->documents().size());
 
   InterfaceFileRef ClientA("ClientA", AllTargets);
@@ -1197,6 +1198,38 @@ TEST(TBDv5, SimSupport) {
   EXPECT_TRUE(ReadFile->hasSimulatorSupport());
 }
 
+TEST(TBDv5, NotForSharedCache) {
+  static const char TBDv5File[] = R"({ 
+"tapi_tbd_version": 5,
+"main_library": {
+  "target_info": [
+    {
+      "target": "arm64-macos",
+      "min_deployment": "11.1" 
+    }
+  ],
+  "install_names":[
+    { "name":"/S/L/F/Foo.framework/Foo" }
+  ],
+  "flags":[ 
+    { "attributes": ["not_for_dyld_shared_cache"] }
+  ] 
+}})";
+
+  Expected<TBDFile> Result =
+      TextAPIReader::get(MemoryBufferRef(TBDv5File, "Test.tbd"));
+  EXPECT_TRUE(!!Result);
+  Target ExpectedTarget = Target(AK_arm64, PLATFORM_MACOS, VersionTuple(11, 1));
+  TBDFile ReadFile = std::move(Result.get());
+  EXPECT_EQ(FileType::TBD_V5, ReadFile->getFileType());
+  EXPECT_EQ(std::string("/S/L/F/Foo.framework/Foo"),
+            ReadFile->getInstallName());
+  EXPECT_TRUE(ReadFile->targets().begin() != ReadFile->targets().end());
+  EXPECT_EQ(*ReadFile->targets().begin(), ExpectedTarget);
+  EXPECT_FALSE(ReadFile->hasSimulatorSupport());
+  EXPECT_TRUE(ReadFile->isOSLibNotForSharedCache());
+}
+
 TEST(TBDv5, MergeIF) {
   static const char TBDv5FileA[] = R"({
 "tapi_tbd_version": 5,