diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -1100,6 +1100,7 @@
 
     resolvedFrameworks.clear();
     resolvedLibraries.clear();
+    resolvedReads.clear();
     concatOutputSections.clear();
     inputFiles.clear();
     inputSections.clear();
diff --git a/lld/MachO/InputFiles.h b/lld/MachO/InputFiles.h
--- a/lld/MachO/InputFiles.h
+++ b/lld/MachO/InputFiles.h
@@ -14,6 +14,7 @@
 
 #include "lld/Common/LLVM.h"
 #include "lld/Common/Memory.h"
+#include "llvm/ADT/CachedHashString.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/BinaryFormat/MachO.h"
@@ -211,6 +212,7 @@
 };
 
 extern llvm::SetVector<InputFile *> inputFiles;
+extern llvm::DenseMap<llvm::CachedHashStringRef, MemoryBufferRef> resolvedReads;
 
 llvm::Optional<MemoryBufferRef> readFile(StringRef path);
 
diff --git a/lld/MachO/InputFiles.cpp b/lld/MachO/InputFiles.cpp
--- a/lld/MachO/InputFiles.cpp
+++ b/lld/MachO/InputFiles.cpp
@@ -178,7 +178,7 @@
 // level, and other files like the filelist that are only read once.
 // Theoretically this caching could be more efficient by hoisting it, but that
 // would require altering many callers to track the state.
-static DenseMap<CachedHashStringRef, MemoryBufferRef> resolvedReads;
+DenseMap<CachedHashStringRef, MemoryBufferRef> macho::resolvedReads;
 // Open a given file path and return it as a memory-mapped file.
 Optional<MemoryBufferRef> macho::readFile(StringRef path) {
   CachedHashStringRef key(path);