https://github.com/aviralg updated 
https://github.com/llvm/llvm-project/pull/206148

>From 53a7fcfe0ce7460f02584a39cef072db095c6da3 Mon Sep 17 00:00:00 2001
From: Aviral Goel <[email protected]>
Date: Tue, 30 Jun 2026 09:12:38 -0700
Subject: [PATCH] Add MultiArchStaticLibrary

---
 .../EntityLinker/MultiArchStaticLibrary.h     |  62 ++++++++
 .../Core/EntityLinker/StaticLibrary.h         |   1 +
 .../Core/Model/PrivateFieldNames.def          |   1 +
 .../Core/Serialization/JSONFormat.h           |  16 +++
 .../Core/Serialization/SerializationFormat.h  |  19 ++-
 .../Core/CMakeLists.txt                       |   1 +
 .../Serialization/JSONFormat/Artifact.cpp     |  26 +++-
 .../Serialization/JSONFormat/JSONFormatImpl.h |   8 +-
 .../JSONFormat/MultiArchStaticLibrary.cpp     | 134 ++++++++++++++++++
 .../JSONFormat/StaticLibrary.cpp              |  18 ++-
 .../rt-multi-arch-static-library-empty.json   |  14 ++
 ...rt-multi-arch-static-library-nonempty.json |  35 +++++
 .../ssaf-format/Artifact/round-trip.test      |  13 ++
 .../ssaf-format/Artifact/top-level.test       |   2 +-
 .../Inputs/duplicate-target-triple.json       |  23 +++
 .../Inputs/invalid-syntax.json                |   1 +
 .../Inputs/member-inner-error.json            |  10 ++
 .../Inputs/member-mismatched-type.json        |  14 ++
 .../Inputs/member-missing-type.json           |  13 ++
 .../Inputs/member-not-object.json             |   6 +
 .../Inputs/members-not-array.json             |   4 +
 .../Inputs/mismatched-type.json               |  14 ++
 .../Inputs/missing-members.json               |   3 +
 .../Inputs/missing-type.json                  |  13 ++
 .../Inputs/not-json-extension.txt             |   1 +
 .../Inputs/not-object.json                    |   1 +
 .../Inputs/rt-empty-members.json              |   4 +
 .../Inputs/rt-multiple-members.json           |  23 +++
 .../Inputs/rt-nonempty-members.json           |  47 ++++++
 .../Inputs/rt-single-member.json              |  14 ++
 .../Inputs/rt-three-members.json              |  32 +++++
 .../Inputs/unsorted-members-input.json        |  23 +++
 .../Inputs/unsorted-three-members-input.json  |  32 +++++
 .../MultiArchStaticLibrary/io.test            |  49 +++++++
 .../MultiArchStaticLibrary/permissions.test   |  40 ++++++
 .../MultiArchStaticLibrary/round-trip.test    |  55 +++++++
 .../MultiArchStaticLibrary/top-level.test     |  71 ++++++++++
 clang/tools/clang-ssaf-format/SSAFFormat.cpp  |  20 ++-
 .../TUSummaryExtractorFrontendActionTest.cpp  |  18 +++
 .../Registries/MockSerializationFormat.cpp    |  13 ++
 .../Registries/MockSerializationFormat.h      |   6 +
 .../ScalableStaticAnalysis/TestFixture.h      |   1 +
 42 files changed, 879 insertions(+), 22 deletions(-)
 create mode 100644 
clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h
 create mode 100644 
clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/MultiArchStaticLibrary.cpp
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-empty.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-nonempty.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/duplicate-target-triple.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/invalid-syntax.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-inner-error.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-mismatched-type.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-missing-type.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-not-object.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/members-not-array.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/mismatched-type.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-members.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-type.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-json-extension.txt
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-object.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-empty-members.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-multiple-members.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-nonempty-members.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-single-member.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-three-members.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-members-input.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-three-members-input.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/io.test
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/permissions.test
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/round-trip.test
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/top-level.test

diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h
 
b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h
new file mode 100644
index 0000000000000..ef64c8b665e5e
--- /dev/null
+++ 
b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h
@@ -0,0 +1,62 @@
+//===- MultiArchStaticLibrary.h ---------------------------------*- C++ 
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the MultiArchStaticLibrary class, which represents a
+// multi-architecture wrapper around per-architecture StaticLibrary
+// instances (the SSAF analogue of a Mach-O fat static library, e.g. one
+// produced by `lipo -create` over per-arch `.a` files).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef 
LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_ENTITYLINKER_MULTIARCHSTATICLIBRARY_H
+#define 
LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_ENTITYLINKER_MULTIARCHSTATICLIBRARY_H
+
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h"
+#include <memory>
+#include <set>
+#include <tuple>
+
+namespace clang::ssaf {
+
+/// Represents a multi-architecture static library.
+///
+/// A MultiArchStaticLibrary bundles per-architecture StaticLibrary
+/// members, mirroring the role of a Mach-O fat static library (the result
+/// of `lipo -create` over per-architecture `.a` files).
+class MultiArchStaticLibrary {
+  friend class SerializationFormat;
+  friend class TestFixture;
+
+  /// Orders members by their TargetTriple's canonical enum components.
+  /// llvm::Triple's parser maps alias spellings to the same enum values
+  /// (e.g. "aarch64" and "arm64" both become Triple::aarch64), so a
+  /// tuple-of-enums compare is equivalent to comparing normalized triples
+  /// for identity, but without the per-call string allocation.
+  struct MemberByTargetTriple {
+    static auto key(const llvm::Triple &T) {
+      return std::make_tuple(T.getArch(), T.getSubArch(), T.getVendor(),
+                             T.getOS(), T.getEnvironment(),
+                             T.getObjectFormat());
+    }
+    bool operator()(const std::unique_ptr<StaticLibrary> &A,
+                    const std::unique_ptr<StaticLibrary> &B) const {
+      return key(A->TargetTriple) < key(B->TargetTriple);
+    }
+  };
+
+  // StaticLibrary objects ordered by TargetTriple enum components. Two
+  // members with the same TargetTriple are not permitted.
+  std::set<std::unique_ptr<StaticLibrary>, MemberByTargetTriple> Members;
+
+public:
+  MultiArchStaticLibrary() = default;
+};
+
+} // namespace clang::ssaf
+
+#endif // 
LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_ENTITYLINKER_MULTIARCHSTATICLIBRARY_H
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h 
b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h
index ae8cfa4c7bacb..4ed34c9ec68cf 100644
--- 
a/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h
+++ 
b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h
@@ -39,6 +39,7 @@ namespace clang::ssaf {
 /// tool never decodes per-entity payloads, and the linker consumes them
 /// as-is during its selective inclusion pass.
 class StaticLibrary {
+  friend class MultiArchStaticLibrary;
   friend class SerializationFormat;
   friend class TestFixture;
 
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def 
b/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def
index b1c37823dc3fe..7777b0adb4a06 100644
--- 
a/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def
+++ 
b/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def
@@ -35,6 +35,7 @@ FIELD(LUSummaryEncoding, Data)
 FIELD(LUSummaryEncoding, IdTable)
 FIELD(LUSummaryEncoding, LinkageTable)
 FIELD(LUSummaryEncoding, LUNamespace)
+FIELD(MultiArchStaticLibrary, Members)
 FIELD(NestedBuildNamespace, Namespaces)
 FIELD(StaticLibrary, Members)
 FIELD(StaticLibrary, Namespace)
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h 
b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h
index d4b6cfc0e1690..094628ab7fa04 100644
--- a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h
+++ b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h
@@ -74,6 +74,12 @@ class JSONFormat final : public SerializationFormat {
   llvm::Error writeStaticLibrary(const StaticLibrary &S,
                                  llvm::StringRef Path) override;
 
+  llvm::Expected<MultiArchStaticLibrary>
+  readMultiArchStaticLibrary(llvm::StringRef Path) override;
+
+  llvm::Error writeMultiArchStaticLibrary(const MultiArchStaticLibrary &M,
+                                          llvm::StringRef Path) override;
+
   llvm::Expected<WPASuite> readWPASuite(llvm::StringRef Path) override;
 
   llvm::Error writeWPASuite(const WPASuite &Suite,
@@ -132,11 +138,21 @@ class JSONFormat final : public SerializationFormat {
   /// See \c readTUSummaryFromObject for caller responsibilities.
   llvm::Expected<StaticLibrary> readStaticLibraryFromObject(const Object 
&Root);
 
+  /// Parses a MultiArchStaticLibrary from an already-validated root JSON
+  /// object. See \c readTUSummaryFromObject for caller responsibilities.
+  llvm::Expected<MultiArchStaticLibrary>
+  readMultiArchStaticLibraryFromObject(const Object &Root);
+
   /// Serializes a TUSummaryEncoding to a JSON object including its
   /// self-describing \c type field. Used both by \c writeTUSummaryEncoding
   /// and by the StaticLibrary writer to emit member entries.
   Object tuSummaryEncodingToJSON(const TUSummaryEncoding &SE) const;
 
+  /// Serializes a StaticLibrary to a JSON object including its
+  /// self-describing \c type field. Used both by \c writeStaticLibrary
+  /// and by the MultiArchStaticLibrary writer to emit per-arch slices.
+  Object staticLibraryToJSON(const StaticLibrary &S) const;
+
   /// Parses a WPASuite from an already-validated root JSON object. See
   /// \c readTUSummaryFromObject for caller responsibilities.
   llvm::Expected<WPASuite> readWPASuiteFromObject(const Object &Root);
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
 
b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
index 29b662bc0e380..a9c25de95a598 100644
--- 
a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
+++ 
b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
@@ -16,6 +16,7 @@
 
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
+#include 
"clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h"
@@ -42,11 +43,12 @@ using Artifact = std::variant<TUSummary, LUSummary, 
WPASuite>;
 /// artifacts but with their per-entity summary payloads left as opaque
 /// format-specific encodings rather than fully resolved analysis results.
 ///
-/// \c StaticLibrary appears only in this variant: the archiver tool and
-/// the linker pass member payloads through without decoding them, so a
-/// fully decoded static-library shape would have no consumer.
-using ArtifactEncoding =
-    std::variant<TUSummaryEncoding, LUSummaryEncoding, StaticLibrary>;
+/// \c StaticLibrary and \c MultiArchStaticLibrary appear only in this
+/// variant: the archiver/arch tools and the linker pass member payloads
+/// through without decoding them, so fully decoded shapes would have no
+/// consumer.
+using ArtifactEncoding = std::variant<TUSummaryEncoding, LUSummaryEncoding,
+                                      StaticLibrary, MultiArchStaticLibrary>;
 
 /// Abstract base class for serialization formats.
 class SerializationFormat {
@@ -106,6 +108,13 @@ class SerializationFormat {
   virtual llvm::Error writeStaticLibrary(const StaticLibrary &S,
                                          llvm::StringRef Path) = 0;
 
+  virtual llvm::Expected<MultiArchStaticLibrary>
+  readMultiArchStaticLibrary(llvm::StringRef Path) = 0;
+
+  virtual llvm::Error
+  writeMultiArchStaticLibrary(const MultiArchStaticLibrary &M,
+                              llvm::StringRef Path) = 0;
+
   virtual llvm::Expected<WPASuite> readWPASuite(llvm::StringRef Path) = 0;
 
   virtual llvm::Error writeWPASuite(const WPASuite &Suite,
diff --git a/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt 
b/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt
index 0a0ce19d63732..47f018f61becf 100644
--- a/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt
+++ b/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt
@@ -17,6 +17,7 @@ add_clang_library(clangScalableStaticAnalysisCore
   Serialization/JSONFormat/JSONFormatImpl.cpp
   Serialization/JSONFormat/LUSummary.cpp
   Serialization/JSONFormat/LUSummaryEncoding.cpp
+  Serialization/JSONFormat/MultiArchStaticLibrary.cpp
   Serialization/JSONFormat/StaticLibrary.cpp
   Serialization/JSONFormat/TUSummary.cpp
   Serialization/JSONFormat/TUSummaryEncoding.cpp
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp
index e5fc46a8ea952..a34f5cb718ab2 100644
--- 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp
+++ 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp
@@ -155,11 +155,21 @@ JSONFormat::readArtifactEncoding(llvm::StringRef Path) {
     return ArtifactEncoding{std::move(*ExpectedStaticLibrary)};
   }
 
-  return ErrorBuilder::create(std::errc::invalid_argument,
-                              ErrorMessages::UnknownArtifactEncodingType,
-                              *ExpectedType, JSONTypeKey,
-                              JSONTypeValueTUSummary, JSONTypeValueLUSummary,
-                              JSONTypeValueStaticLibrary)
+  if (*ExpectedType == JSONTypeValueMultiArchStaticLibrary) {
+    auto ExpectedM = readMultiArchStaticLibraryFromObject(*RootObjectPtr);
+    if (!ExpectedM) {
+      return ErrorBuilder::wrap(ExpectedM.takeError())
+          .context(ErrorMessages::ReadingFromFile, "ArtifactEncoding", Path)
+          .build();
+    }
+    return ArtifactEncoding{std::move(*ExpectedM)};
+  }
+
+  return ErrorBuilder::create(
+             std::errc::invalid_argument,
+             ErrorMessages::UnknownArtifactEncodingType, *ExpectedType,
+             JSONTypeKey, JSONTypeValueTUSummary, JSONTypeValueLUSummary,
+             JSONTypeValueStaticLibrary, JSONTypeValueMultiArchStaticLibrary)
       .context(ErrorMessages::ReadingFromFile, "ArtifactEncoding", Path)
       .build();
 }
@@ -173,11 +183,13 @@ llvm::Error JSONFormat::writeArtifactEncoding(const 
ArtifactEncoding &E,
           return writeTUSummaryEncoding(Enc, Path);
         } else if constexpr (std::is_same_v<T, LUSummaryEncoding>) {
           return writeLUSummaryEncoding(Enc, Path);
+        } else if constexpr (std::is_same_v<T, StaticLibrary>) {
+          return writeStaticLibrary(Enc, Path);
         } else {
           static_assert(
-              std::is_same_v<T, StaticLibrary>,
+              std::is_same_v<T, MultiArchStaticLibrary>,
               "ArtifactEncoding visitor must cover all variant alternatives");
-          return writeStaticLibrary(Enc, Path);
+          return writeMultiArchStaticLibrary(Enc, Path);
         }
       },
       E);
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
index e83a8dabac113..9cfe67e20d1d7 100644
--- 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
+++ 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
@@ -85,7 +85,8 @@ inline constexpr const char *MismatchedSummaryType =
 inline constexpr const char *UnknownArtifactType =
     "unknown value '{0}' for field '{1}': expected '{2}', '{3}', or '{4}'";
 inline constexpr const char *UnknownArtifactEncodingType =
-    "unknown value '{0}' for field '{1}': expected '{2}', '{3}', or '{4}'";
+    "unknown value '{0}' for field '{1}': expected '{2}', '{3}', '{4}', or "
+    "'{5}'";
 
 inline constexpr const char *FailedToDeserializeEntitySummaryNoFormatInfo =
     "failed to deserialize EntitySummary: no FormatInfo registered for '{0}'";
@@ -152,6 +153,11 @@ inline constexpr const char *JSONTypeValueLUSummary = 
"LUSummary";
 /// Value written to \c JSONTypeKey for serialized \c StaticLibrary files.
 inline constexpr const char *JSONTypeValueStaticLibrary = "StaticLibrary";
 
+/// Value written to \c JSONTypeKey for serialized \c MultiArchStaticLibrary
+/// files.
+inline constexpr const char *JSONTypeValueMultiArchStaticLibrary =
+    "MultiArchStaticLibrary";
+
 /// Value written to \c JSONTypeKey for serialized \c WPASuite files.
 inline constexpr const char *JSONTypeValueWPASuite = "WPASuite";
 
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/MultiArchStaticLibrary.cpp
 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/MultiArchStaticLibrary.cpp
new file mode 100644
index 0000000000000..810924944a4ee
--- /dev/null
+++ 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/MultiArchStaticLibrary.cpp
@@ -0,0 +1,134 @@
+//===- MultiArchStaticLibrary.cpp 
-----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "JSONFormatImpl.h"
+
+#include 
"clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h"
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h"
+#include "llvm/TargetParser/Triple.h"
+
+namespace clang::ssaf {
+
+//----------------------------------------------------------------------------
+// MultiArchStaticLibrary
+//----------------------------------------------------------------------------
+
+llvm::Expected<MultiArchStaticLibrary>
+JSONFormat::readMultiArchStaticLibrary(llvm::StringRef Path) {
+  auto ExpectedJSON = readJSON(Path);
+  if (!ExpectedJSON) {
+    return ErrorBuilder::wrap(ExpectedJSON.takeError())
+        .context(ErrorMessages::ReadingFromFile, "MultiArchStaticLibrary", 
Path)
+        .build();
+  }
+
+  Object *RootObjectPtr = ExpectedJSON->getAsObject();
+  if (!RootObjectPtr) {
+    return ErrorBuilder::create(std::errc::invalid_argument,
+                                ErrorMessages::FailedToReadObject,
+                                "MultiArchStaticLibrary", "object")
+        .context(ErrorMessages::ReadingFromFile, "MultiArchStaticLibrary", 
Path)
+        .build();
+  }
+
+  if (auto Err = checkSummaryType(*RootObjectPtr,
+                                  JSONTypeValueMultiArchStaticLibrary)) {
+    return ErrorBuilder::wrap(std::move(Err))
+        .context(ErrorMessages::ReadingFromFile, "MultiArchStaticLibrary", 
Path)
+        .build();
+  }
+
+  auto ExpectedM = readMultiArchStaticLibraryFromObject(*RootObjectPtr);
+  if (!ExpectedM) {
+    return ErrorBuilder::wrap(ExpectedM.takeError())
+        .context(ErrorMessages::ReadingFromFile, "MultiArchStaticLibrary", 
Path)
+        .build();
+  }
+
+  return std::move(*ExpectedM);
+}
+
+llvm::Expected<MultiArchStaticLibrary>
+JSONFormat::readMultiArchStaticLibraryFromObject(const Object &RootObject) {
+  const Array *MembersArray = RootObject.getArray("members");
+  if (!MembersArray) {
+    return ErrorBuilder::create(std::errc::invalid_argument,
+                                ErrorMessages::FailedToReadObjectAtField,
+                                "MultiArchStaticLibrary members", "members",
+                                "array")
+        .build();
+  }
+
+  MultiArchStaticLibrary M;
+  auto &Members = getMembers(M);
+
+  for (const auto &[Index, MemberValue] : llvm::enumerate(*MembersArray)) {
+    const Object *MemberObject = MemberValue.getAsObject();
+    if (!MemberObject) {
+      return ErrorBuilder::create(std::errc::invalid_argument,
+                                  ErrorMessages::FailedToReadObjectAtIndex,
+                                  "MultiArchStaticLibrary member", Index,
+                                  "object")
+          .build();
+    }
+
+    if (auto Err =
+            checkSummaryType(*MemberObject, JSONTypeValueStaticLibrary)) {
+      return ErrorBuilder::wrap(std::move(Err))
+          .context(ErrorMessages::ReadingFromIndex,
+                   "MultiArchStaticLibrary member", Index)
+          .build();
+    }
+
+    auto ExpectedMember = readStaticLibraryFromObject(*MemberObject);
+    if (!ExpectedMember) {
+      return ErrorBuilder::wrap(ExpectedMember.takeError())
+          .context(ErrorMessages::ReadingFromIndex,
+                   "MultiArchStaticLibrary member", Index)
+          .build();
+    }
+
+    auto [It, Inserted] = Members.insert(
+        std::make_unique<StaticLibrary>(std::move(*ExpectedMember)));
+    if (!Inserted) {
+      auto MemberTriple = llvm::Triple::normalize(getTargetTriple(**It).str());
+      return ErrorBuilder::create(std::errc::invalid_argument,
+                                  ErrorMessages::FailedInsertionOnDuplication,
+                                  "MultiArchStaticLibrary member", Index,
+                                  MemberTriple)
+          .build();
+    }
+  }
+
+  return std::move(M);
+}
+
+llvm::Error
+JSONFormat::writeMultiArchStaticLibrary(const MultiArchStaticLibrary &M,
+                                        llvm::StringRef Path) {
+  Object RootObject;
+
+  RootObject[JSONTypeKey] = JSONTypeValueMultiArchStaticLibrary;
+
+  Array MembersArray;
+  MembersArray.reserve(getMembers(M).size());
+  for (const auto &Member : getMembers(M)) {
+    MembersArray.push_back(staticLibraryToJSON(*Member));
+  }
+  RootObject["members"] = std::move(MembersArray);
+
+  if (auto Error = writeJSON(std::move(RootObject), Path)) {
+    return ErrorBuilder::wrap(std::move(Error))
+        .context(ErrorMessages::WritingToFile, "MultiArchStaticLibrary", Path)
+        .build();
+  }
+
+  return llvm::Error::success();
+}
+
+} // namespace clang::ssaf
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/StaticLibrary.cpp
 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/StaticLibrary.cpp
index b34c63b185b0e..d4538d19aed24 100644
--- 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/StaticLibrary.cpp
+++ 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/StaticLibrary.cpp
@@ -164,6 +164,16 @@ JSONFormat::readStaticLibraryFromObject(const Object 
&RootObject) {
 
 llvm::Error JSONFormat::writeStaticLibrary(const StaticLibrary &S,
                                            llvm::StringRef Path) {
+  if (auto Error = writeJSON(staticLibraryToJSON(S), Path)) {
+    return ErrorBuilder::wrap(std::move(Error))
+        .context(ErrorMessages::WritingToFile, "StaticLibrary", Path)
+        .build();
+  }
+
+  return llvm::Error::success();
+}
+
+Object JSONFormat::staticLibraryToJSON(const StaticLibrary &S) const {
   Object RootObject;
 
   RootObject[JSONTypeKey] = JSONTypeValueStaticLibrary;
@@ -180,13 +190,7 @@ llvm::Error JSONFormat::writeStaticLibrary(const 
StaticLibrary &S,
   }
   RootObject["members"] = std::move(MembersArray);
 
-  if (auto Error = writeJSON(std::move(RootObject), Path)) {
-    return ErrorBuilder::wrap(std::move(Error))
-        .context(ErrorMessages::WritingToFile, "StaticLibrary", Path)
-        .build();
-  }
-
-  return llvm::Error::success();
+  return RootObject;
 }
 
 } // namespace clang::ssaf
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-empty.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-empty.json
new file mode 100644
index 0000000000000..7b361e52946e1
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-empty.json
@@ -0,0 +1,14 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-nonempty.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-nonempty.json
new file mode 100644
index 0000000000000..10486cebf75be
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-multi-arch-static-library-nonempty.json
@@ -0,0 +1,35 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [
+        {
+          "data": [],
+          "id_table": [],
+          "linkage_table": [],
+          "target_triple": "x86_64-apple-macosx",
+          "tu_namespace": {
+            "kind": "CompilationUnit",
+            "name": "a.cpp"
+          },
+          "type": "TUSummary"
+        }
+      ],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "x86_64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git a/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test
index d6d67826e4847..32214cabbc36b 100644
--- a/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test
+++ b/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test
@@ -47,3 +47,16 @@
 // RUN: diff %S/Inputs/rt-static-library-empty.json 
%t/rt-static-library-empty-enc.json
 // RUN: clang-ssaf-format --type auto --encoding 
%S/Inputs/rt-static-library-empty.json -o 
%t/rt-static-library-empty-enc-explicit.json
 // RUN: diff %S/Inputs/rt-static-library-empty.json 
%t/rt-static-library-empty-enc-explicit.json
+
+// RUN: clang-ssaf-format --encoding 
%S/Inputs/rt-multi-arch-static-library-empty.json -o 
%t/rt-multi-arch-static-library-empty-enc.json
+// RUN: diff %S/Inputs/rt-multi-arch-static-library-empty.json 
%t/rt-multi-arch-static-library-empty-enc.json
+// RUN: clang-ssaf-format --type auto --encoding 
%S/Inputs/rt-multi-arch-static-library-empty.json -o 
%t/rt-multi-arch-static-library-empty-enc-explicit.json
+// RUN: diff %S/Inputs/rt-multi-arch-static-library-empty.json 
%t/rt-multi-arch-static-library-empty-enc-explicit.json
+
+// Non-empty MultiArchStaticLibrary routed through the auto-mode --encoding
+// dispatcher exercises both arch-slice writers and the inner TUSummaryEncoding
+// path inside the StaticLibrary member.
+// RUN: clang-ssaf-format --encoding 
%S/Inputs/rt-multi-arch-static-library-nonempty.json -o 
%t/rt-multi-arch-static-library-nonempty-enc.json
+// RUN: diff %S/Inputs/rt-multi-arch-static-library-nonempty.json 
%t/rt-multi-arch-static-library-nonempty-enc.json
+// RUN: clang-ssaf-format --type auto --encoding 
%S/Inputs/rt-multi-arch-static-library-nonempty.json -o 
%t/rt-multi-arch-static-library-nonempty-enc-explicit.json
+// RUN: diff %S/Inputs/rt-multi-arch-static-library-nonempty.json 
%t/rt-multi-arch-static-library-nonempty-enc-explicit.json
diff --git a/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test
index 7838f3a90534c..5f8333ca52b37 100644
--- a/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test
+++ b/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test
@@ -40,4 +40,4 @@
 // RUN: not clang-ssaf-format --type auto --encoding 
%S/Inputs/unknown-type.json 2>&1 \
 // RUN:   | FileCheck %s --match-full-lines 
--check-prefix=ENCODING-UNKNOWN-TYPE
 // ENCODING-UNKNOWN-TYPE:      clang-ssaf-format: error: reading 
ArtifactEncoding from file '{{.*}}unknown-type.json'
-// ENCODING-UNKNOWN-TYPE-NEXT: unknown value 'Mystery' for field 'type': 
expected 'TUSummary', 'LUSummary', or 'StaticLibrary'
+// ENCODING-UNKNOWN-TYPE-NEXT: unknown value 'Mystery' for field 'type': 
expected 'TUSummary', 'LUSummary', 'StaticLibrary', or 'MultiArchStaticLibrary'
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/duplicate-target-triple.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/duplicate-target-triple.json
new file mode 100644
index 0000000000000..af94a33d2eff0
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/duplicate-target-triple.json
@@ -0,0 +1,23 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/invalid-syntax.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/invalid-syntax.json
new file mode 100644
index 0000000000000..b0e13f61aa06e
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/invalid-syntax.json
@@ -0,0 +1 @@
+{ invalid json }
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-inner-error.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-inner-error.json
new file mode 100644
index 0000000000000..8f06d662e6994
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-inner-error.json
@@ -0,0 +1,10 @@
+{
+  "members": [
+    {
+      "members": [],
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-mismatched-type.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-mismatched-type.json
new file mode 100644
index 0000000000000..8680c6e7aec1d
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-mismatched-type.json
@@ -0,0 +1,14 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "TUSummary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-missing-type.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-missing-type.json
new file mode 100644
index 0000000000000..6779f9b89ae2f
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-missing-type.json
@@ -0,0 +1,13 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-not-object.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-not-object.json
new file mode 100644
index 0000000000000..8756cf45a716e
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/member-not-object.json
@@ -0,0 +1,6 @@
+{
+  "members": [
+    "not an object"
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/members-not-array.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/members-not-array.json
new file mode 100644
index 0000000000000..8d4a18c4333d8
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/members-not-array.json
@@ -0,0 +1,4 @@
+{
+  "members": {},
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/mismatched-type.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/mismatched-type.json
new file mode 100644
index 0000000000000..390eb2a4cb0a9
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/mismatched-type.json
@@ -0,0 +1,14 @@
+{
+  "members": {
+    "arm64": {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  },
+  "type": "StaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-members.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-members.json
new file mode 100644
index 0000000000000..245015c536185
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-members.json
@@ -0,0 +1,3 @@
+{
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-type.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-type.json
new file mode 100644
index 0000000000000..ea946be0839aa
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/missing-type.json
@@ -0,0 +1,13 @@
+{
+  "members": {
+    "arm64": {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  }
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-json-extension.txt
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-json-extension.txt
new file mode 100644
index 0000000000000..0967ef424bce6
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-json-extension.txt
@@ -0,0 +1 @@
+{}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-object.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-object.json
new file mode 100644
index 0000000000000..fe51488c7066f
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/not-object.json
@@ -0,0 +1 @@
+[]
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-empty-members.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-empty-members.json
new file mode 100644
index 0000000000000..a04e97923e36d
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-empty-members.json
@@ -0,0 +1,4 @@
+{
+  "members": [],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-multiple-members.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-multiple-members.json
new file mode 100644
index 0000000000000..aeaa4dc04a3ca
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-multiple-members.json
@@ -0,0 +1,23 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "x86_64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-nonempty-members.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-nonempty-members.json
new file mode 100644
index 0000000000000..91f89e3b4c6f8
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-nonempty-members.json
@@ -0,0 +1,47 @@
+{
+  "members": [
+    {
+      "members": [
+        {
+          "data": [],
+          "id_table": [],
+          "linkage_table": [],
+          "target_triple": "arm64-apple-macosx",
+          "tu_namespace": {
+            "kind": "CompilationUnit",
+            "name": "a.cpp"
+          },
+          "type": "TUSummary"
+        }
+      ],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [
+        {
+          "data": [],
+          "id_table": [],
+          "linkage_table": [],
+          "target_triple": "x86_64-apple-macosx",
+          "tu_namespace": {
+            "kind": "CompilationUnit",
+            "name": "a.cpp"
+          },
+          "type": "TUSummary"
+        }
+      ],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "x86_64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-single-member.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-single-member.json
new file mode 100644
index 0000000000000..7b361e52946e1
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-single-member.json
@@ -0,0 +1,14 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-three-members.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-three-members.json
new file mode 100644
index 0000000000000..f64ae43057bdf
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/rt-three-members.json
@@ -0,0 +1,32 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64_32-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "x86_64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-members-input.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-members-input.json
new file mode 100644
index 0000000000000..298f4817861d1
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-members-input.json
@@ -0,0 +1,23 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "x86_64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-three-members-input.json
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-three-members-input.json
new file mode 100644
index 0000000000000..fec759645e966
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/Inputs/unsorted-three-members-input.json
@@ -0,0 +1,32 @@
+{
+  "members": [
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "x86_64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64-apple-macosx",
+      "type": "StaticLibrary"
+    },
+    {
+      "members": [],
+      "namespace": {
+        "kind": "StaticLibrary",
+        "name": "libfoo"
+      },
+      "target_triple": "arm64_32-apple-macosx",
+      "type": "StaticLibrary"
+    }
+  ],
+  "type": "MultiArchStaticLibrary"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/io.test 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/io.test
new file mode 100644
index 0000000000000..56f5bdd2021c0
--- /dev/null
+++ b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/io.test
@@ -0,0 +1,49 @@
+// File-I/O error tests: readJSON() input validation and writeJSON() output
+// validation for clang-ssaf-format --type multi-arch-static-library.
+
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+
+// ============================================================================
+// readJSON() errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/nonexistent.json 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=NONEXISTENT-FILE
+// NONEXISTENT-FILE: clang-ssaf-format: error: failed to validate path 
'{{.*}}nonexistent.json': Path does not exist
+
+// RUN: mkdir -p %t/test-directory.json
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%t/test-directory.json 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=PATH-IS-DIRECTORY
+// PATH-IS-DIRECTORY: clang-ssaf-format: error: failed to validate path 
'{{.*}}test-directory.json': Path is not a file
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/not-json-extension.txt 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=NOT-JSON-EXTENSION
+// NOT-JSON-EXTENSION: clang-ssaf-format: error: failed to validate path 
'{{.*}}not-json-extension.txt': No format registered for extension 'txt'
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/invalid-syntax.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=INVALID-SYNTAX
+// INVALID-SYNTAX:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}invalid-syntax.json'
+// INVALID-SYNTAX-NEXT: {{.*}}Expected object key
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/not-object.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=NOT-OBJECT
+// NOT-OBJECT:      clang-ssaf-format: error: reading MultiArchStaticLibrary 
from file '{{.*}}not-object.json'
+// NOT-OBJECT-NEXT: failed to read MultiArchStaticLibrary: expected JSON object
+
+// ============================================================================
+// writeJSON() errors
+// ============================================================================
+
+// RUN: echo '{}' > %t/existing.json
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-single-member.json -o %t/existing.json 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=WRITE-FILE-ALREADY-EXISTS
+// WRITE-FILE-ALREADY-EXISTS: clang-ssaf-format: error: failed to validate 
path '{{.*}}existing.json': File already exists
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-single-member.json -o %t/nonexistent-dir/test.json 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=WRITE-PARENT-DIRECTORY-NOT-FOUND
+// WRITE-PARENT-DIRECTORY-NOT-FOUND: clang-ssaf-format: error: failed to 
validate path '{{.*}}nonexistent-dir{{.}}test.json': Parent directory does not 
exist
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-single-member.json -o %t/test.txt 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=WRITE-NOT-JSON-EXTENSION
+// WRITE-NOT-JSON-EXTENSION: clang-ssaf-format: error: failed to validate path 
'{{.*}}test.txt': No format registered for extension 'txt'
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/permissions.test
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/permissions.test
new file mode 100644
index 0000000000000..821099842135b
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/permissions.test
@@ -0,0 +1,40 @@
+// Tests for clang-ssaf-format --type multi-arch-static-library that
+// require filesystem permission support (symlinks, chmod).
+
+// UNSUPPORTED: system-windows
+// REQUIRES: non-root-user
+
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+
+// ============================================================================
+// Broken symlink
+// ============================================================================
+
+// RUN: ln -sf %t/nonexistent-target.json %t/broken-symlink.json
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%t/broken-symlink.json 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=BROKEN-SYMLINK
+// BROKEN-SYMLINK: clang-ssaf-format: error: failed to validate path 
'{{.*}}broken-symlink.json': Path does not exist
+
+// ============================================================================
+// No read permission
+// ============================================================================
+
+// RUN: cp %S/Inputs/rt-single-member.json %t/no-read-permission.json
+// RUN: chmod -r %t/no-read-permission.json
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%t/no-read-permission.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=NO-READ-PERMISSION
+// RUN: chmod +r %t/no-read-permission.json
+// NO-READ-PERMISSION:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}no-read-permission.json'
+// NO-READ-PERMISSION-NEXT: failed to read file 
'{{.*}}no-read-permission.json': {{.*}}
+
+// ============================================================================
+// Write to directory without write permission
+// ============================================================================
+
+// RUN: mkdir -p %t/write-protected-dir
+// RUN: chmod -w %t/write-protected-dir
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-single-member.json -o %t/write-protected-dir/test.json 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=WRITE-STREAM-OPEN-FAILURE
+// RUN: chmod +w %t/write-protected-dir
+// WRITE-STREAM-OPEN-FAILURE: clang-ssaf-format: error: failed to validate 
path '{{.*}}write-protected-dir{{.}}test.json': Parent directory is not writable
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/round-trip.test
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/round-trip.test
new file mode 100644
index 0000000000000..502ed54d8f1f1
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/round-trip.test
@@ -0,0 +1,55 @@
+// Round-trip tests: read a MultiArchStaticLibrary JSON input, write it
+// back out, and diff the result against the original.
+//
+// MultiArchStaticLibrary has only an encoding representation, so
+// --encoding is a no-op for --type multi-arch-static-library and both
+// invocations must produce the same output.
+
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+
+// An empty members array is a valid (if degenerate) MultiArchStaticLibrary.
+// RUN: clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-empty-members.json -o %t/rt-empty-members.json
+// RUN: diff %S/Inputs/rt-empty-members.json %t/rt-empty-members.json
+// RUN: clang-ssaf-format --type multi-arch-static-library --encoding 
%S/Inputs/rt-empty-members.json -o %t/rt-empty-members-enc.json
+// RUN: diff %S/Inputs/rt-empty-members.json %t/rt-empty-members-enc.json
+
+// RUN: clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-single-member.json -o %t/rt-single-member.json
+// RUN: diff %S/Inputs/rt-single-member.json %t/rt-single-member.json
+// RUN: clang-ssaf-format --type multi-arch-static-library --encoding 
%S/Inputs/rt-single-member.json -o %t/rt-single-member-enc.json
+// RUN: diff %S/Inputs/rt-single-member.json %t/rt-single-member-enc.json
+
+// RUN: clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-multiple-members.json -o %t/rt-multiple-members.json
+// RUN: diff %S/Inputs/rt-multiple-members.json %t/rt-multiple-members.json
+// RUN: clang-ssaf-format --type multi-arch-static-library --encoding 
%S/Inputs/rt-multiple-members.json -o %t/rt-multiple-members-enc.json
+// RUN: diff %S/Inputs/rt-multiple-members.json %t/rt-multiple-members-enc.json
+
+// RUN: clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-nonempty-members.json -o %t/rt-nonempty-members.json
+// RUN: diff %S/Inputs/rt-nonempty-members.json %t/rt-nonempty-members.json
+// RUN: clang-ssaf-format --type multi-arch-static-library --encoding 
%S/Inputs/rt-nonempty-members.json -o %t/rt-nonempty-members-enc.json
+// RUN: diff %S/Inputs/rt-nonempty-members.json %t/rt-nonempty-members-enc.json
+
+// ============================================================================
+// Member sort order
+// ============================================================================
+//
+// Members are stored in a std::set keyed by TargetTriple enum components,
+// so the writer emits them in enum-tuple order regardless of input order.
+// unsorted-members-input.json lists the members as x86_64, then arm64;
+// the writer must produce the canonical (arm64, x86_64) ordering, byte
+// identical to rt-multiple-members.json.
+
+// RUN: clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/unsorted-members-input.json -o %t/unsorted-members-output.json
+// RUN: diff %S/Inputs/rt-multiple-members.json %t/unsorted-members-output.json
+// RUN: clang-ssaf-format --type multi-arch-static-library --encoding 
%S/Inputs/unsorted-members-input.json -o %t/unsorted-members-output-enc.json
+// RUN: diff %S/Inputs/rt-multiple-members.json 
%t/unsorted-members-output-enc.json
+
+// 3-member ordering: confirms the sort isn't an accidental two-element
+// swap. The unsorted input lists x86_64, arm64, arm64_32; the writer
+// must produce (arm64, arm64_32, x86_64) — byte identical to
+// rt-three-members.json.
+
+// RUN: clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/rt-three-members.json -o %t/rt-three-members.json
+// RUN: diff %S/Inputs/rt-three-members.json %t/rt-three-members.json
+// RUN: clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/unsorted-three-members-input.json -o 
%t/unsorted-three-members-output.json
+// RUN: diff %S/Inputs/rt-three-members.json 
%t/unsorted-three-members-output.json
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/top-level.test
 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/top-level.test
new file mode 100644
index 0000000000000..d46e251485f75
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/MultiArchStaticLibrary/top-level.test
@@ -0,0 +1,71 @@
+// Top-level MultiArchStaticLibrary structure tests: type discriminator,
+// members array, per-member validation including duplicate-target-triple
+// rejection.
+
+// ============================================================================
+// readMultiArchStaticLibrary() / writeMultiArchStaticLibrary() type-field
+// errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/missing-type.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MISSING-TYPE
+// MISSING-TYPE:      clang-ssaf-format: error: reading MultiArchStaticLibrary 
from file '{{.*}}missing-type.json'
+// MISSING-TYPE-NEXT: failed to read summary type from field 'type': expected 
JSON string
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/mismatched-type.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MISMATCHED-TYPE
+// MISMATCHED-TYPE:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}mismatched-type.json'
+// MISMATCHED-TYPE-NEXT: expected 'MultiArchStaticLibrary' for field 'type' 
but got 'StaticLibrary'
+
+// ============================================================================
+// members field errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/missing-members.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MISSING-MEMBERS
+// MISSING-MEMBERS:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}missing-members.json'
+// MISSING-MEMBERS-NEXT: failed to read MultiArchStaticLibrary members from 
field 'members': expected JSON array
+
+// The members field must be a JSON array, not an object.
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/members-not-array.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MEMBERS-NOT-ARRAY
+// MEMBERS-NOT-ARRAY:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}members-not-array.json'
+// MEMBERS-NOT-ARRAY-NEXT: failed to read MultiArchStaticLibrary members from 
field 'members': expected JSON array
+
+// ============================================================================
+// per-member errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/member-not-object.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MEMBER-NOT-OBJECT
+// MEMBER-NOT-OBJECT:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}member-not-object.json'
+// MEMBER-NOT-OBJECT-NEXT: failed to read MultiArchStaticLibrary member from 
index '0': expected JSON object
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/member-missing-type.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MEMBER-MISSING-TYPE
+// MEMBER-MISSING-TYPE:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}member-missing-type.json'
+// MEMBER-MISSING-TYPE-NEXT: reading MultiArchStaticLibrary member from index 
'0'
+// MEMBER-MISSING-TYPE-NEXT: failed to read summary type from field 'type': 
expected JSON string
+
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/member-mismatched-type.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=MEMBER-MISMATCHED-TYPE
+// MEMBER-MISMATCHED-TYPE:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}member-mismatched-type.json'
+// MEMBER-MISMATCHED-TYPE-NEXT: reading MultiArchStaticLibrary member from 
index '0'
+// MEMBER-MISMATCHED-TYPE-NEXT: expected 'StaticLibrary' for field 'type' but 
got 'TUSummary'
+
+// Members are identified by their full target_triple. Two members sharing
+// the same target_triple are rejected.
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/duplicate-target-triple.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=DUPLICATE-TARGET-TRIPLE
+// DUPLICATE-TARGET-TRIPLE:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}duplicate-target-triple.json'
+// DUPLICATE-TARGET-TRIPLE-NEXT: failed to insert MultiArchStaticLibrary 
member at index '1': encountered duplicate 'arm64-apple-macosx'
+
+// Verifies that errors raised inside readStaticLibraryFromObject (here, a
+// missing namespace on the member) are properly wrapped with the
+// "reading MultiArchStaticLibrary member from index 'N'" context, then
+// with the outer "reading MultiArchStaticLibrary from file '...'" context.
+// RUN: not clang-ssaf-format --type multi-arch-static-library 
%S/Inputs/member-inner-error.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MEMBER-INNER-ERROR
+// MEMBER-INNER-ERROR:      clang-ssaf-format: error: reading 
MultiArchStaticLibrary from file '{{.*}}member-inner-error.json'
+// MEMBER-INNER-ERROR-NEXT: reading MultiArchStaticLibrary member from index 
'0'
+// MEMBER-INNER-ERROR-NEXT: failed to read BuildNamespace from field 
'namespace': expected JSON object
diff --git a/clang/tools/clang-ssaf-format/SSAFFormat.cpp 
b/clang/tools/clang-ssaf-format/SSAFFormat.cpp
index 5b94da384cb7d..b0f123f75be2a 100644
--- a/clang/tools/clang-ssaf-format/SSAFFormat.cpp
+++ b/clang/tools/clang-ssaf-format/SSAFFormat.cpp
@@ -12,6 +12,7 @@
 
//===----------------------------------------------------------------------===//
 
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
+#include 
"clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h"
@@ -40,7 +41,14 @@ namespace {
 // Summary Type
 
//===----------------------------------------------------------------------===//
 
-enum class SummaryType { Auto, TU, LU, StaticLibrary, WPA };
+enum class SummaryType {
+  Auto,
+  TU,
+  LU,
+  StaticLibrary,
+  MultiArchStaticLibrary,
+  WPA
+};
 
 
//===----------------------------------------------------------------------===//
 // Command-Line Options
@@ -66,6 +74,9 @@ cl::opt<SummaryType> Type(
                clEnumValN(SummaryType::LU, "lu", "Link unit summary"),
                clEnumValN(SummaryType::StaticLibrary, "static-library",
                           "Static library of translation unit summaries"),
+               clEnumValN(SummaryType::MultiArchStaticLibrary,
+                          "multi-arch-static-library",
+                          "Multi-architecture static library"),
                clEnumValN(SummaryType::WPA, "wpa",
                           "Whole-program analysis suite")),
     cl::init(SummaryType::Auto), cl::cat(SsafFormatCategory));
@@ -304,6 +315,13 @@ void convert(const FormatInput &FI) {
     run(FI, &SerializationFormat::readStaticLibrary,
         &SerializationFormat::writeStaticLibrary);
     return;
+  case SummaryType::MultiArchStaticLibrary:
+    // MultiArchStaticLibrary has only an encoded representation, so
+    // --encoding is a no-op here: both paths route to
+    // readMultiArchStaticLibrary / writeMultiArchStaticLibrary.
+    run(FI, &SerializationFormat::readMultiArchStaticLibrary,
+        &SerializationFormat::writeMultiArchStaticLibrary);
+    return;
   case SummaryType::WPA:
     run(FI, &SerializationFormat::readWPASuite,
         &SerializationFormat::writeWPASuite);
diff --git 
a/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
 
b/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
index 4baf593f57eef..79504a4f9754f 100644
--- 
a/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
+++ 
b/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
@@ -108,6 +108,16 @@ class FailingSerializationFormat final : public 
SerializationFormat {
     return failing("writeStaticLibrary");
   }
 
+  llvm::Expected<MultiArchStaticLibrary>
+  readMultiArchStaticLibrary(llvm::StringRef Path) override {
+    return failing("readMultiArchStaticLibrary");
+  }
+
+  llvm::Error writeMultiArchStaticLibrary(const MultiArchStaticLibrary &M,
+                                          llvm::StringRef Path) override {
+    return failing("writeMultiArchStaticLibrary");
+  }
+
   llvm::Expected<WPASuite> readWPASuite(llvm::StringRef Path) override {
     return failing("readWPASuite");
   }
@@ -196,6 +206,14 @@ class CapturingSerializationFormat final : public 
SerializationFormat {
                                  llvm::StringRef) override {
     return llvm::Error::success();
   }
+  llvm::Expected<MultiArchStaticLibrary>
+  readMultiArchStaticLibrary(llvm::StringRef) override {
+    return llvm::createStringError("not implemented");
+  }
+  llvm::Error writeMultiArchStaticLibrary(const MultiArchStaticLibrary &,
+                                          llvm::StringRef) override {
+    return llvm::Error::success();
+  }
   llvm::Expected<WPASuite> readWPASuite(llvm::StringRef) override {
     return llvm::createStringError("not implemented");
   }
diff --git 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp
index 4a01248b53ac7..92d6d0abc8936 100644
--- 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp
+++ 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp
@@ -9,6 +9,7 @@
 #include "Registries/MockSerializationFormat.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
+#include 
"clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h"
@@ -209,6 +210,18 @@ llvm::Error 
MockSerializationFormat::writeStaticLibrary(const StaticLibrary &S,
   llvm_unreachable("MockSerializationFormat does not support StaticLibrary");
 }
 
+llvm::Expected<MultiArchStaticLibrary>
+MockSerializationFormat::readMultiArchStaticLibrary(llvm::StringRef Path) {
+  llvm_unreachable(
+      "MockSerializationFormat does not support MultiArchStaticLibrary");
+}
+
+llvm::Error MockSerializationFormat::writeMultiArchStaticLibrary(
+    const MultiArchStaticLibrary &M, llvm::StringRef Path) {
+  llvm_unreachable(
+      "MockSerializationFormat does not support MultiArchStaticLibrary");
+}
+
 llvm::Expected<WPASuite>
 MockSerializationFormat::readWPASuite(llvm::StringRef Path) {
   llvm_unreachable("MockSerializationFormat does not support WPASuite");
diff --git 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h
index 0cadd0b98fe3a..e03e5092589fe 100644
--- 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h
+++ 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h
@@ -50,6 +50,12 @@ class MockSerializationFormat final : public 
SerializationFormat {
   llvm::Error writeStaticLibrary(const StaticLibrary &S,
                                  llvm::StringRef Path) override;
 
+  llvm::Expected<MultiArchStaticLibrary>
+  readMultiArchStaticLibrary(llvm::StringRef Path) override;
+
+  llvm::Error writeMultiArchStaticLibrary(const MultiArchStaticLibrary &M,
+                                          llvm::StringRef Path) override;
+
   llvm::Expected<Artifact> readArtifact(llvm::StringRef Path) override;
 
   llvm::Error writeArtifact(const Artifact &A, llvm::StringRef Path) override;
diff --git a/clang/unittests/ScalableStaticAnalysis/TestFixture.h 
b/clang/unittests/ScalableStaticAnalysis/TestFixture.h
index e7eed940938ce..c2b7005bd4b0c 100644
--- a/clang/unittests/ScalableStaticAnalysis/TestFixture.h
+++ b/clang/unittests/ScalableStaticAnalysis/TestFixture.h
@@ -11,6 +11,7 @@
 
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
+#include 
"clang/ScalableStaticAnalysis/Core/EntityLinker/MultiArchStaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/StaticLibrary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h"

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