diff --git a/lld/MachO/Driver.h b/lld/MachO/Driver.h
--- a/lld/MachO/Driver.h
+++ b/lld/MachO/Driver.h
@@ -54,7 +54,8 @@
 // Check for both libfoo.dylib and libfoo.tbd (in that order).
 llvm::Optional<StringRef> resolveDylibPath(llvm::StringRef path);
 
-DylibFile *loadDylib(llvm::MemoryBufferRef mbref, DylibFile *umbrella = nullptr,
+DylibFile *loadDylib(llvm::MemoryBufferRef mbref, bool forceWeakImport,
+                     DylibFile *umbrella = nullptr,
                      bool isBundleLoader = false);
 void resetLoadedDylibs();
 
diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -249,7 +249,8 @@
 static DenseMap<StringRef, ArchiveFile *> loadedArchives;
 
 static InputFile *addFile(StringRef path, ForceLoad forceLoadArchive,
-                          bool isExplicit = true, bool isBundleLoader = false) {
+                          bool isExplicit = true, bool isBundleLoader = false,
+                          bool forceWeakImport = false) {
   Optional<MemoryBufferRef> buffer = readFile(path);
   if (!buffer)
     return nullptr;
@@ -324,7 +325,7 @@
   case file_magic::macho_dynamically_linked_shared_lib:
   case file_magic::macho_dynamically_linked_shared_lib_stub:
   case file_magic::tapi_file:
-    if (DylibFile *dylibFile = loadDylib(mbref)) {
+    if (DylibFile *dylibFile = loadDylib(mbref, forceWeakImport)) {
       if (isExplicit)
         dylibFile->explicitlyLinked = true;
       newFile = dylibFile;
@@ -339,7 +340,8 @@
     // as a bundle loader.
     if (!isBundleLoader)
       error(path + ": unhandled file type");
-    if (DylibFile *dylibFile = loadDylib(mbref, nullptr, isBundleLoader))
+    if (DylibFile *dylibFile =
+            loadDylib(mbref, forceWeakImport, nullptr, isBundleLoader))
       newFile = dylibFile;
     break;
   default:
@@ -360,11 +362,13 @@
                        ForceLoad forceLoadArchive) {
   if (Optional<StringRef> path = findLibrary(name)) {
     if (auto *dylibFile = dyn_cast_or_null<DylibFile>(
-            addFile(*path, forceLoadArchive, isExplicit))) {
+            addFile(*path, forceLoadArchive, isExplicit,
+                    /*isBundleLoader=*/false, isWeak))) {
+
+      if (isWeak)
+        assert(dylibFile->forceWeakImport);
       if (isNeeded)
         dylibFile->forceNeeded = true;
-      if (isWeak)
-        dylibFile->forceWeakImport = true;
       if (isReexport) {
         config->hasReexports = true;
         dylibFile->reexport = true;
@@ -380,11 +384,11 @@
                          ForceLoad forceLoadArchive) {
   if (Optional<StringRef> path = findFramework(name)) {
     if (auto *dylibFile = dyn_cast_or_null<DylibFile>(
-            addFile(*path, forceLoadArchive, isExplicit))) {
+            addFile(*path, forceLoadArchive, isExplicit, false, isWeak))) {
       if (isNeeded)
         dylibFile->forceNeeded = true;
       if (isWeak)
-        dylibFile->forceWeakImport = true;
+        assert(dylibFile->forceWeakImport);
       if (isReexport) {
         config->hasReexports = true;
         dylibFile->reexport = true;
@@ -985,8 +989,10 @@
       break;
     case OPT_weak_library:
       if (auto *dylibFile = dyn_cast_or_null<DylibFile>(
-              addFile(rerootPath(arg->getValue()), ForceLoad::Default)))
-        dylibFile->forceWeakImport = true;
+              addFile(rerootPath(arg->getValue()), ForceLoad::Default,
+                      /*isExplicit*/ true, /*isBundleLoader*/ false,
+                      /*forceWeakImport*/ true)))
+        assert(dylibFile->forceWeakImport);
       break;
     case OPT_filelist:
       addFileList(arg->getValue());
diff --git a/lld/MachO/DriverUtils.cpp b/lld/MachO/DriverUtils.cpp
--- a/lld/MachO/DriverUtils.cpp
+++ b/lld/MachO/DriverUtils.cpp
@@ -204,12 +204,14 @@
 // especially if it's a commonly re-exported core library.
 static DenseMap<CachedHashStringRef, DylibFile *> loadedDylibs;
 
-DylibFile *macho::loadDylib(MemoryBufferRef mbref, DylibFile *umbrella,
-                            bool isBundleLoader) {
+DylibFile *macho::loadDylib(MemoryBufferRef mbref, bool forceWeakImport,
+                            DylibFile *umbrella, bool isBundleLoader) {
   CachedHashStringRef path(mbref.getBufferIdentifier());
   DylibFile *&file = loadedDylibs[path];
-  if (file)
+  if (file) {
+    file->forceWeakImport |= forceWeakImport;
     return file;
+  }
 
   DylibFile *newFile;
   file_magic magic = identify_magic(mbref.getBuffer());
@@ -243,6 +245,7 @@
     if (newFile->exportingFile)
       newFile->parseLoadCommands(mbref);
   }
+  newFile->forceWeakImport = forceWeakImport;
   return newFile;
 }
 
diff --git a/lld/MachO/InputFiles.cpp b/lld/MachO/InputFiles.cpp
--- a/lld/MachO/InputFiles.cpp
+++ b/lld/MachO/InputFiles.cpp
@@ -992,7 +992,7 @@
     error("could not read dylib file at " + path);
     return nullptr;
   }
-  return loadDylib(*mbref, umbrella);
+  return loadDylib(*mbref, /*forceWeakImport*/ false, umbrella);
 }
 
 // TBD files are parsed into a series of TAPI documents (InterfaceFiles), with
diff --git a/lld/MachO/SymbolTable.cpp b/lld/MachO/SymbolTable.cpp
--- a/lld/MachO/SymbolTable.cpp
+++ b/lld/MachO/SymbolTable.cpp
@@ -150,6 +150,7 @@
   std::tie(s, wasInserted) = insert(name, file);
 
   RefState refState = RefState::Unreferenced;
+  bool wasForceWeak = false;
   if (!wasInserted) {
     if (auto *defined = dyn_cast<Defined>(s)) {
       if (isWeakDef && !defined->isWeakDef())
@@ -158,14 +159,19 @@
       refState = undefined->refState;
     } else if (auto *dysym = dyn_cast<DylibSymbol>(s)) {
       refState = dysym->getRefState();
+      if (DylibFile *prevFile = dysym->getFile())
+        wasForceWeak = prevFile->forceWeakImport;
     }
   }
 
   bool isDynamicLookup = file == nullptr;
-  if (wasInserted || isa<Undefined>(s) ||
-      (isa<DylibSymbol>(s) &&
-       ((!isWeakDef && s->isWeakDef()) ||
-        (!isDynamicLookup && cast<DylibSymbol>(s)->isDynamicLookup())))) {
+  if (!isDynamicLookup && !wasInserted && file->forceWeakImport &&
+      !wasForceWeak)
+    replaceSymbol<DylibSymbol>(s, file, name, isWeakDef, refState, isTlv);
+  else if (wasInserted || isa<Undefined>(s) ||
+           (isa<DylibSymbol>(s) &&
+            ((!isWeakDef && s->isWeakDef()) ||
+             (!isDynamicLookup && cast<DylibSymbol>(s)->isDynamicLookup())))) {
     if (auto *dynsym = dyn_cast<DylibSymbol>(s))
       dynsym->unreference();
     replaceSymbol<DylibSymbol>(s, file, name, isWeakDef, refState, isTlv);
diff --git a/lld/MachO/Symbols.h b/lld/MachO/Symbols.h
--- a/lld/MachO/Symbols.h
+++ b/lld/MachO/Symbols.h
@@ -235,8 +235,13 @@
   }
 
   uint64_t getVA() const override;
-  bool isWeakDef() const override { return weakDef; }
-  bool isWeakRef() const override { return refState == RefState::Weak; }
+  bool isWeakDef() const override {
+    return weakDef || (file && dyn_cast<DylibFile>(file)->forceWeakImport);
+  }
+  bool isWeakRef() const override {
+    return refState == RefState::Weak ||
+           (file && dyn_cast<DylibFile>(file)->forceWeakImport);
+  }
   bool isReferenced() const { return refState != RefState::Unreferenced; }
   bool isTlv() const override { return tlv; }
   bool isDynamicLookup() const { return file == nullptr; }
diff --git a/lld/test/MachO/weak-import.s b/lld/test/MachO/weak-import.s
--- a/lld/test/MachO/weak-import.s
+++ b/lld/test/MachO/weak-import.s
@@ -9,12 +9,12 @@
 # RUN: %lld -lSystem -dylib %t/bar.o -o %t/libbar.dylib
 # RUN: %lld -lSystem -dylib %t/foo.o %t/libbar.dylib -sub_library libbar -o %t/libfoo.dylib
 
-# RUN: %lld -weak-lSystem %t/test.o -weak_framework CoreFoundation -weak_library %t/libfoo.dylib -o %t/test
-# RUN: llvm-objdump --macho --all-headers %t/test | FileCheck %s -DDIR=%t --check-prefixes=WEAK-SYS,WEAK-FOO
+# RUN: %lld -weak-lSystem %t/test.o -weak_framework CoreFoundation -weak_library %t/libfoo.dylib -o %t/test_weak_core
+# RUN: llvm-objdump --macho --all-headers %t/test_weak_core | FileCheck %s -DDIR=%t --check-prefixes=WEAK-SYS,WEAK-FOO
 # RUN: %lld -weak-lSystem %t/test.o \
 # RUN:   -framework CoreFoundation -weak_framework CoreFoundation -framework CoreFoundation \
-# RUN:   %t/libfoo.dylib -weak_library %t/libfoo.dylib %t/libfoo.dylib -o %t/test
-# RUN: llvm-objdump --macho --all-headers %t/test | FileCheck %s -DDIR=%t --check-prefixes=WEAK-SYS,WEAK-FOO
+# RUN:   %t/libfoo.dylib -weak_library %t/libfoo.dylib %t/libfoo.dylib -o %t/test_strong_weak_core
+# RUN: llvm-objdump --macho --all-headers %t/test_strong_weak_core | FileCheck %s -DDIR=%t --check-prefixes=WEAK-SYS,WEAK-FOO
 # RUN: %lld -lSystem -dylib %t/libfoo.dylib %t/weak-ref-only.o -o %t/weak-ref-only
 # RUN: llvm-objdump --macho --all-headers %t/weak-ref-only | FileCheck %s -DDIR=%t --check-prefixes=SYS,WEAK-FOO
 # RUN: %lld -lSystem -dylib %t/libfoo.dylib %t/weak-ref-sub-library.o -o %t/weak-ref-sub-library
@@ -22,6 +22,11 @@
 # RUN: %lld -lSystem -dylib %t/libfoo.dylib %t/mixed-ref.o -o %t/mixed-ref
 # RUN: llvm-objdump --macho --all-headers %t/mixed-ref | FileCheck %s -DDIR=%t --check-prefixes=SYS,FOO
 
+# RUN: %lld -framework CoreFoundation %t/test.o -weak_framework CoreFoundation -o %t/strong_weak_import.out
+# RUN: %lld -weak_framework CoreFoundation %t/test.o -framework CoreFoundation -o %t/weak_strong_import.out
+# RUN: llvm-objdump --macho --bind %t/strong_weak_import.out | FileCheck %s --check-prefix=WEAK-IMP
+# RUN: llvm-objdump --macho --bind %t/weak_strong_import.out | FileCheck %s --check-prefix=WEAK-IMP
+
 # WEAK-SYS:          cmd LC_LOAD_WEAK_DYLIB
 # WEAK-SYS-NEXT: cmdsize
 # WEAK-SYS-NEXT:    name /usr/lib/libSystem.dylib
@@ -42,6 +47,7 @@
 # FOO-NEXT:      cmdsize
 # FOO-NEXT:         name [[DIR]]/libfoo.dylib
 
+# WEAK-IMP: {{.+}} pointer         0 CoreFoundation   __CFBigNumGetInt128 (weak_import)
 #--- foo.s
 .globl _foo
 _foo:
@@ -69,4 +75,5 @@
 #--- test.s
 .globl _main
 _main:
+  movq __CFBigNumGetInt128@GOTPCREL(%rip), %rax        
   ret