4 files changed, 31 insertions, 3 deletions
diff --git a/clang/lib/Lex/ModuleMap.cpp b/clang/lib/Lex/ModuleMap.cpp
index c66bd70487f..a7524028a22 100644
--- a/clang/lib/Lex/ModuleMap.cpp
+++ b/clang/lib/Lex/ModuleMap.cpp
@@ -581,9 +581,18 @@ static void inferFrameworkLink(Module *Mod, const DirectoryEntry *FrameworkDir,
   SmallString<128> LibName;
   LibName += FrameworkDir->getName();
   llvm::sys::path::append(LibName, Mod->Name);
-  if (FileMgr.getFile(LibName)) {
-    Mod->LinkLibraries.push_back(Module::LinkLibrary(Mod->Name,
-                                                     /*IsFramework=*/true));
+
+  // The library name of a framework has more than one possible extension since
+  // the introduction of the text-based dynamic library format. We need to check
+  // for both before we give up.
+  static const char *frameworkExtensions[] = {"", ".tbd"};
+  for (const auto *extension : frameworkExtensions) {
+    llvm::sys::path::replace_extension(LibName, extension);
+    if (FileMgr.getFile(LibName)) {
+      Mod->LinkLibraries.push_back(Module::LinkLibrary(Mod->Name,
+                                                       /*IsFramework=*/true));
+      return;
+    }
   }
 }
 
diff --git a/clang/test/Modules/Inputs/AutolinkTBD.framework/AutolinkTBD.tbd b/clang/test/Modules/Inputs/AutolinkTBD.framework/AutolinkTBD.tbd
new file mode 100644
index 00000000000..4aa0f85d0d5
--- /dev/null
+++ b/clang/test/Modules/Inputs/AutolinkTBD.framework/AutolinkTBD.tbd
@@ -0,0 +1 @@
+empty file - clang only needs to check if it exists.
diff --git a/clang/test/Modules/Inputs/AutolinkTBD.framework/Headers/AutolinkTBD.h b/clang/test/Modules/Inputs/AutolinkTBD.framework/Headers/AutolinkTBD.h
new file mode 100644
index 00000000000..cf790ac3eab
--- /dev/null
+++ b/clang/test/Modules/Inputs/AutolinkTBD.framework/Headers/AutolinkTBD.h
@@ -0,0 +1 @@
+extern int foo();
diff --git a/clang/test/Modules/autolinkTBD.m b/clang/test/Modules/autolinkTBD.m
new file mode 100644
index 00000000000..6107952c3b9
--- /dev/null
+++ b/clang/test/Modules/autolinkTBD.m
@@ -0,0 +1,17 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -emit-llvm -o - -fmodules-cache-path=%t -fmodules -fimplicit-module-maps -F %S/Inputs %s | FileCheck %s
+// RUN: %clang_cc1 -emit-llvm -fno-autolink -o - -fmodules-cache-path=%t -fmodules -fimplicit-module-maps -F %S/Inputs %s | FileCheck --check-prefix=CHECK-AUTOLINK-DISABLED %s
+
+@import AutolinkTBD;
+
+int f() {
+  return foo();
+}
+
+// CHECK: !llvm.module.flags = !{{{.*}}}
+// CHECK: !{{[0-9]+}} = !{i32 6, !"Linker Options", ![[AUTOLINK_OPTIONS:[0-9]+]]}
+// CHECK: ![[AUTOLINK_OPTIONS]] = !{![[AUTOLINK_FRAMEWORK:[0-9]+]]}
+// CHECK: ![[AUTOLINK_FRAMEWORK]] = !{!"-framework", !"AutolinkTBD"}
+
+// CHECK-AUTOLINK-DISABLED: !llvm.module.flags
+// CHECK-AUTOLINK-DISABLED-NOT: "Linker Options"