diff --git a/include/swift/AST/ModuleDependencies.h b/include/swift/AST/ModuleDependencies.h
index 3739d7465eaf1..8f427a75e5205 100644
--- a/include/swift/AST/ModuleDependencies.h
+++ b/include/swift/AST/ModuleDependencies.h
@@ -31,6 +31,7 @@
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/StringSet.h"
+#include "llvm/CAS/CASConfiguration.h"
 #include "llvm/CAS/CachingOnDiskFileSystem.h"
 #include "llvm/Support/Mutex.h"
 #include <optional>
@@ -967,7 +968,7 @@ using ModuleDependenciesKindMap =
 /// dependency scanner.
 class SwiftDependencyScanningService {
   /// The CASOption created the Scanning Service if used.
-  std::optional<clang::CASOptions> CASOpts;
+  std::optional<llvm::cas::CASConfiguration> CASConfig;
 
   /// The persistent Clang dependency scanner service
   std::optional<clang::tooling::dependencies::DependencyScanningService>
diff --git a/include/swift/Basic/CASOptions.h b/include/swift/Basic/CASOptions.h
index 567c34671fc49..a3ec5d603997c 100644
--- a/include/swift/Basic/CASOptions.h
+++ b/include/swift/Basic/CASOptions.h
@@ -20,6 +20,7 @@
 
 #include "clang/CAS/CASOptions.h"
 #include "llvm/ADT/Hashing.h"
+#include "llvm/CAS/CASConfiguration.h"
 
 namespace swift {
 
@@ -37,8 +38,8 @@ class CASOptions final {
   /// Import modules from CAS.
   bool ImportModuleFromCAS = false;
 
-  /// CASOptions
-  clang::CASOptions CASOpts;
+  /// CAS Configuration.
+  llvm::cas::CASConfiguration Config;
 
   /// Clang Include Trees.
   std::string ClangIncludeTree;
@@ -80,6 +81,15 @@ class CASOptions final {
   llvm::hash_code getModuleScanningHashComponents() const {
     return getPCHHashComponents();
   }
+
+  /// Return corresponding clang::CASOptions for swift CASOptions.
+  clang::CASOptions getClangCASOptions() const {
+    clang::CASOptions CASOpts;
+    CASOpts.CASPath = Config.CASPath;
+    CASOpts.PluginPath = Config.PluginPath;
+    CASOpts.PluginOptions = Config.PluginOptions;
+    return CASOpts;
+  }
 };
 
 } // namespace swift
diff --git a/lib/AST/ModuleDependencies.cpp b/lib/AST/ModuleDependencies.cpp
index ae2ba45e722af..15ece7bd9498a 100644
--- a/lib/AST/ModuleDependencies.cpp
+++ b/lib/AST/ModuleDependencies.cpp
@@ -636,9 +636,9 @@ bool SwiftDependencyScanningService::setupCachingDependencyScanningService(
   if (!Instance.getInvocation().getCASOptions().EnableCaching)
     return false;
 
-  if (CASOpts) {
+  if (CASConfig) {
     // If CASOption matches, the service is initialized already.
-    if (*CASOpts == Instance.getInvocation().getCASOptions().CASOpts)
+    if (*CASConfig == Instance.getInvocation().getCASOptions().Config)
       return false;
 
     // CASOption mismatch, return error.
@@ -647,12 +647,12 @@ bool SwiftDependencyScanningService::setupCachingDependencyScanningService(
   }
 
   // Setup CAS.
-  CASOpts = Instance.getInvocation().getCASOptions().CASOpts;
+  CASConfig = Instance.getInvocation().getCASOptions().Config;
 
   ClangScanningService.emplace(
       clang::tooling::dependencies::ScanningMode::DependencyDirectivesScan,
       clang::tooling::dependencies::ScanningOutputFormat::FullIncludeTree,
-      Instance.getInvocation().getCASOptions().CASOpts,
+      Instance.getInvocation().getCASOptions().getClangCASOptions(),
       Instance.getSharedCASInstance(), Instance.getSharedCacheInstance(),
       /*CachingOnDiskFileSystem=*/nullptr,
       // The current working directory optimization (off by default)
diff --git a/lib/Basic/CASOptions.cpp b/lib/Basic/CASOptions.cpp
index f7e5119f9aa07..8ba863a960754 100644
--- a/lib/Basic/CASOptions.cpp
+++ b/lib/Basic/CASOptions.cpp
@@ -23,14 +23,14 @@ void CASOptions::enumerateCASConfigurationFlags(
       llvm::function_ref<void(llvm::StringRef)> Callback) const {
   if (EnableCaching) {
     Callback("-cache-compile-job");
-    if (!CASOpts.CASPath.empty()) {
+    if (!Config.CASPath.empty()) {
       Callback("-cas-path");
-      Callback(CASOpts.CASPath);
+      Callback(Config.CASPath);
     }
-    if (!CASOpts.PluginPath.empty()) {
+    if (!Config.PluginPath.empty()) {
       Callback("-cas-plugin-path");
-      Callback(CASOpts.PluginPath);
-      for (auto Opt : CASOpts.PluginOptions) {
+      Callback(Config.PluginPath);
+      for (auto Opt : Config.PluginOptions) {
         Callback("-cas-plugin-option");
         Callback((llvm::Twine(Opt.first) + "=" + Opt.second).str());
       }
diff --git a/lib/ClangImporter/ClangImporter.cpp b/lib/ClangImporter/ClangImporter.cpp
index 70664b4b7ba56..62ff26e7ebf5c 100644
--- a/lib/ClangImporter/ClangImporter.cpp
+++ b/lib/ClangImporter/ClangImporter.cpp
@@ -1184,7 +1184,7 @@ std::optional<std::vector<std::string>> ClangImporter::getClangCC1Arguments(
     // compiler can be more efficient to compute swift cache key without having
     // the knowledge about clang command-line options.
     if (ctx.CASOpts.EnableCaching || ctx.CASOpts.ImportModuleFromCAS) {
-      CI->getCASOpts() = ctx.CASOpts.CASOpts;
+      CI->getCASOpts() = ctx.CASOpts.getClangCASOptions();
       // When clangImporter is used to compile (generate .pcm or .pch), need to
       // inherit the include tree from swift args (last one wins) and clear the
       // input file.
diff --git a/lib/DependencyScan/ScanDependencies.cpp b/lib/DependencyScan/ScanDependencies.cpp
index e78151de2eb71..2b004bd6b1a38 100644
--- a/lib/DependencyScan/ScanDependencies.cpp
+++ b/lib/DependencyScan/ScanDependencies.cpp
@@ -146,7 +146,8 @@ class ExplicitModuleDependencyResolver {
           bridgingHeaderBuildCmd.push_back("-Xcc");
           bridgingHeaderBuildCmd.push_back("-fmodule-file-cache-key");
           bridgingHeaderBuildCmd.push_back("-Xcc");
-          bridgingHeaderBuildCmd.push_back(clangDep->mappedPCMPath);
+          bridgingHeaderBuildCmd.push_back(
+              llvm::sys::path::filename(clangDep->mappedPCMPath).str());
           bridgingHeaderBuildCmd.push_back("-Xcc");
           bridgingHeaderBuildCmd.push_back(clangDep->moduleCacheKey);
         }
@@ -276,17 +277,19 @@ class ExplicitModuleDependencyResolver {
   bool handleClangModuleDependency(
       ModuleDependencyID depModuleID,
       const ClangModuleDependencyStorage &clangDepDetails) {
+    auto pcmPath =
+        llvm::sys::path::filename(clangDepDetails.mappedPCMPath).str();
     if (!resolvingDepInfo.isSwiftSourceModule()) {
       if (!resolvingDepInfo.isClangModule()) {
         commandline.push_back("-Xcc");
         commandline.push_back("-fmodule-file=" + depModuleID.ModuleName + "=" +
-                              clangDepDetails.mappedPCMPath);
+                              pcmPath);
       }
       if (!clangDepDetails.moduleCacheKey.empty()) {
         commandline.push_back("-Xcc");
         commandline.push_back("-fmodule-file-cache-key");
         commandline.push_back("-Xcc");
-        commandline.push_back(clangDepDetails.mappedPCMPath);
+        commandline.push_back(pcmPath);
         commandline.push_back("-Xcc");
         commandline.push_back(clangDepDetails.moduleCacheKey);
       }
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 130b614943174..fb20fd9964873 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -788,17 +788,17 @@ static bool ParseCASArgs(CASOptions &Opts, ArgList &Args,
   Opts.EnableCachingRemarks |= Args.hasArg(OPT_cache_remarks);
   Opts.CacheSkipReplay |= Args.hasArg(OPT_cache_disable_replay);
   if (const Arg *A = Args.getLastArg(OPT_cas_path))
-    Opts.CASOpts.CASPath = A->getValue();
-  else if (Opts.CASOpts.CASPath.empty())
-    Opts.CASOpts.CASPath = llvm::cas::getDefaultOnDiskCASPath();
+    Opts.Config.CASPath = A->getValue();
+  else if (Opts.Config.CASPath.empty())
+    Opts.Config.CASPath = llvm::cas::getDefaultOnDiskCASPath();
 
   if (const Arg *A = Args.getLastArg(OPT_cas_plugin_path))
-    Opts.CASOpts.PluginPath = A->getValue();
+    Opts.Config.PluginPath = A->getValue();
 
   for (StringRef Opt : Args.getAllArgValues(OPT_cas_plugin_option)) {
     StringRef Name, Value;
     std::tie(Name, Value) = Opt.split('=');
-    Opts.CASOpts.PluginOptions.emplace_back(std::string(Name),
+    Opts.Config.PluginOptions.emplace_back(std::string(Name),
                                             std::string(Value));
   }
 
diff --git a/lib/Frontend/Frontend.cpp b/lib/Frontend/Frontend.cpp
index 5cadb6afe4fe1..21dbf4542d1c2 100644
--- a/lib/Frontend/Frontend.cpp
+++ b/lib/Frontend/Frontend.cpp
@@ -465,7 +465,7 @@ bool CompilerInstance::setupCASIfNeeded(ArrayRef<const char *> Args) {
     return false;
 
   const auto &Opts = getInvocation().getCASOptions();
-  auto MaybeDB = Opts.CASOpts.getOrCreateDatabases();
+  auto MaybeDB = Opts.Config.createDatabases();
   if (!MaybeDB) {
     Diagnostics.diagnose(SourceLoc(), diag::error_cas_initialization,
                          toString(MaybeDB.takeError()));
diff --git a/lib/Frontend/ModuleInterfaceLoader.cpp b/lib/Frontend/ModuleInterfaceLoader.cpp
index 98184ffc0d8d0..0cd2ada3659ac 100644
--- a/lib/Frontend/ModuleInterfaceLoader.cpp
+++ b/lib/Frontend/ModuleInterfaceLoader.cpp
@@ -1805,7 +1805,7 @@ void InterfaceSubContextDelegateImpl::inheritOptionsForBuildingInterface(
 
   if (casOpts.EnableCaching) {
     genericSubInvocation.getCASOptions().EnableCaching = casOpts.EnableCaching;
-    genericSubInvocation.getCASOptions().CASOpts = casOpts.CASOpts;
+    genericSubInvocation.getCASOptions().Config = casOpts.Config;
     genericSubInvocation.getCASOptions().HasImmutableFileSystem =
         casOpts.HasImmutableFileSystem;
     casOpts.enumerateCASConfigurationFlags(
diff --git a/lib/FrontendTool/FrontendTool.cpp b/lib/FrontendTool/FrontendTool.cpp
index 4fd5ad88998e0..c2a5bcae58126 100644
--- a/lib/FrontendTool/FrontendTool.cpp
+++ b/lib/FrontendTool/FrontendTool.cpp
@@ -1440,8 +1440,8 @@ static bool generateReproducer(CompilerInstance &Instance,
   llvm::sys::path::append(casPath, "cas");
   clang::CASOptions newCAS;
   newCAS.CASPath = casPath.str();
-  newCAS.PluginPath = casOpts.CASOpts.PluginPath;
-  newCAS.PluginOptions = casOpts.CASOpts.PluginOptions;
+  newCAS.PluginPath = casOpts.Config.PluginPath;
+  newCAS.PluginOptions = casOpts.Config.PluginOptions;
   auto db = newCAS.getOrCreateDatabases();
   if (!db) {
     diags.diagnose(SourceLoc(), diag::error_cas_initialization,
diff --git a/lib/IRGen/IRGenDebugInfo.cpp b/lib/IRGen/IRGenDebugInfo.cpp
index 3390f11f4b2f6..b093e74cc1174 100644
--- a/lib/IRGen/IRGenDebugInfo.cpp
+++ b/lib/IRGen/IRGenDebugInfo.cpp
@@ -913,10 +913,10 @@ class IRGenDebugInfoImpl : public IRGenDebugInfo {
         // Note: The implementation here assumes that all clang submodules
         //       belong to the same PCM file.
         ASTSourceDescriptor ParentDescriptor(*ClangModule->Parent);
-        Parent = getOrCreateModule({ParentDescriptor.getModuleName(),
-                                    ParentDescriptor.getPath(),
-                                    Desc.getASTFile(), Desc.getSignature()},
-                                   ClangModule->Parent);
+        Parent = getOrCreateModule(
+            {ParentDescriptor.getModuleName(), ParentDescriptor.getPath(),
+             Desc.getASTFile(), Desc.getSignature(), /*CASID=*/""},
+            ClangModule->Parent);
       }
       return getOrCreateModule(ClangModule, Parent, Desc.getModuleName(),
                                IncludePath, Signature, Desc.getASTFile());
@@ -2565,11 +2565,11 @@ class IRGenDebugInfoImpl : public IRGenDebugInfo {
           // Describe the submodule, but substitute the cached ASTFile from
           // the toplevel module. The ASTFile pointer in SubModule may be
           // dangling and cant be trusted.
-          Scope = getOrCreateModule({SubModuleDesc->getModuleName(),
-                                     SubModuleDesc->getPath(),
-                                     TopLevelModuleDesc->getASTFile(),
-                                     TopLevelModuleDesc->getSignature()},
-                                    SubModuleDesc->getModuleOrNull());
+          Scope = getOrCreateModule(
+              {SubModuleDesc->getModuleName(), SubModuleDesc->getPath(),
+               TopLevelModuleDesc->getASTFile(),
+               TopLevelModuleDesc->getSignature(), /*CASID=*/""},
+              SubModuleDesc->getModuleOrNull());
         else if (SubModuleDesc->getModuleOrNull() == nullptr)
           // This is (bridging header) PCH.
           Scope = getOrCreateModule(*SubModuleDesc, nullptr);
diff --git a/test/CAS/bridging-header.swift b/test/CAS/bridging-header.swift
index b0bdb8db75a2c..45e26a04f8066 100644
--- a/test/CAS/bridging-header.swift
+++ b/test/CAS/bridging-header.swift
@@ -18,13 +18,13 @@
 // CHECK:         "-dwarf-ext-refs"
 // CHECK:         "-fmodule-file-cache-key",
 // CHECK-NEXT:    "-Xcc",
-// CHECK-NEXT:    "{{.*}}{{/|\\}}A-{{.*}}.pcm",
+// CHECK-NEXT:    "A-{{.*}}.pcm",
 // CHECK-NEXT:    "-Xcc",
 // CHECK-NEXT:    "llvmcas://{{.*}}",
 // CHECK-NEXT:    "-Xcc",
 // CHECK-NEXT:    "-fmodule-file-cache-key",
 // CHECK-NEXT:    "-Xcc",
-// CHECK-NEXT:    "{{.*}}{{/|\\}}B-{{.*}}.pcm",
+// CHECK-NEXT:    "B-{{.*}}.pcm",
 // CHECK-NEXT:    "-Xcc",
 // CHECK-NEXT:    "llvmcas://{{.*}}"
 
diff --git a/test/CAS/debug_info_pcm.swift b/test/CAS/debug_info_pcm.swift
new file mode 100644
index 0000000000000..02ce3aa2cd76c
--- /dev/null
+++ b/test/CAS/debug_info_pcm.swift
@@ -0,0 +1,41 @@
+// RUN: %empty-directory(%t)
+// RUN: split-file %s %t
+
+// RUN: %target-swift-frontend -scan-dependencies -module-name Test -module-cache-path %t/clang-module-cache -O \
+// RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import \
+// RUN:   %t/test.swift -o %t/deps.json -cache-compile-job -cas-path %t/cas -I %t/include
+
+// RUN: %{python} %S/Inputs/BuildCommandExtractor.py %t/deps.json clang:SwiftShims > %t/shim.cmd
+// RUN: %swift_frontend_plain @%t/shim.cmd
+// RUN: %{python} %S/Inputs/BuildCommandExtractor.py %t/deps.json clang:B > %t/B.cmd
+// RUN: %swift_frontend_plain @%t/B.cmd
+// RUN: %{python} %S/Inputs/BuildCommandExtractor.py %t/deps.json clang:A > %t/A.cmd
+// RUN: %swift_frontend_plain @%t/A.cmd
+// RUN: %{python} %S/Inputs/SwiftDepsExtractor.py %t/deps.json clang:A modulePath > %t/A.path
+
+// RUN: dwarfdump --debug-info @%t/A.path | %FileCheck %s
+
+// CHECK: DW_AT_GNU_dwo_name ("llvmcas://{{.*}}")
+
+//--- test.swift
+import A
+
+//--- include/a.h
+#include "b.h"
+struct A {
+  int a;
+};
+
+//--- include/b.h
+void b(void);
+
+//--- include/module.modulemap
+module A {
+  header "a.h"
+  export *
+}
+
+module B {
+  header "b.h"
+  export *
+}
diff --git a/test/CAS/module_path_remap.swift b/test/CAS/module_path_remap.swift
index 40648b749d3b4..ddf82f32d06b4 100644
--- a/test/CAS/module_path_remap.swift
+++ b/test/CAS/module_path_remap.swift
@@ -14,7 +14,7 @@
 // DEPS-FS: /^src/test/CAS/module_path_remap.swift
 
 // RUN: %{python} %S/Inputs/SwiftDepsExtractor.py %t/deps.json deps bridgingHeader | %FileCheck %s -check-prefix DEPS-BRIDGING
-// DEPS-BRIDGING: -fmodule-file=F=/^tmp/clang-module-cache/F-{{.*}}.pcm
+// DEPS-BRIDGING: -fmodule-file=F=F-{{.*}}.pcm
 
 // RUN: %{python} %S/Inputs/SwiftDepsExtractor.py %t/deps.json F casFSRootID > %t/F.fs.casid
 // RUN: %cache-tool -cas-path %t/cas -cache-tool-action print-include-tree-list @%t/F.fs.casid | %FileCheck %s -check-prefix F-FS
@@ -22,7 +22,7 @@
 
 // RUN: %{python} %S/Inputs/SwiftDepsExtractor.py %t/deps.json F commandLine | %FileCheck %s -check-prefix F-CMD
 // F-CMD: /^src/test/CAS/../ScanDependencies/Inputs/Swift/F.swiftinterface
-// F-CMD: -fmodule-file=SwiftShims=/^tmp/clang-module-cache/SwiftShims-{{.*}}.pcm
+// F-CMD: -fmodule-file=SwiftShims=SwiftShims-{{.*}}.pcm
 
 // RUN: %{python} %S/Inputs/SwiftDepsExtractor.py %t/deps.json clang:F clangIncludeTree > %t/tree.casid
 // RUN: clang-cas-test --cas %t/cas --print-include-tree @%t/tree.casid | %FileCheck %s -check-prefix TREE