diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -267,6 +267,7 @@
         make<SharedFile>(mbref, withLOption ? path::filename(path) : path));
     return;
   case file_magic::bitcode:
+  case file_magic::fatlto_object:
   case file_magic::elf_relocatable:
     if (inLib)
       files.push_back(createLazyFile(mbref, "", 0));
diff --git a/lld/ELF/InputFiles.h b/lld/ELF/InputFiles.h
--- a/lld/ELF/InputFiles.h
+++ b/lld/ELF/InputFiles.h
@@ -380,6 +380,10 @@
   return identify_magic(mb.getBuffer()) == llvm::file_magic::bitcode;
 }
 
+inline bool isFatLTOObject(MemoryBufferRef mb) {
+  return identify_magic(mb.getBuffer()) == llvm::file_magic::fatlto_object;
+}
+
 std::string replaceThinLTOSuffix(StringRef path);
 
 } // namespace elf
diff --git a/llvm/include/llvm/BinaryFormat/Magic.h b/llvm/include/llvm/BinaryFormat/Magic.h
--- a/llvm/include/llvm/BinaryFormat/Magic.h
+++ b/llvm/include/llvm/BinaryFormat/Magic.h
@@ -54,6 +54,7 @@
     cuda_fatbinary,      ///< CUDA Fatbinary object file
     offload_binary,      ///< LLVM offload object file
     dxcontainer_object,  ///< DirectX container file
+    fatlto_object,       ///< FatLTO object file
   };
 
   bool is_object() const { return V != unknown; }
diff --git a/llvm/lib/BinaryFormat/Magic.cpp b/llvm/lib/BinaryFormat/Magic.cpp
--- a/llvm/lib/BinaryFormat/Magic.cpp
+++ b/llvm/lib/BinaryFormat/Magic.cpp
@@ -79,6 +79,12 @@
       return file_magic::offload_binary;
     break;
 
+  case 0xFA:
+    if (startswith(Magic, "\xFAtl\x70")) {
+      return file_magic::fatlto_object;
+    }
+    break;
+
   case 0xDE: // 0x0B17C0DE = BC wraper
     if (startswith(Magic, "\xDE\xC0\x17\x0B"))
       return file_magic::bitcode;
diff --git a/llvm/lib/Object/Binary.cpp b/llvm/lib/Object/Binary.cpp
--- a/llvm/lib/Object/Binary.cpp
+++ b/llvm/lib/Object/Binary.cpp
@@ -55,6 +55,7 @@
   case file_magic::elf_executable:
   case file_magic::elf_shared_object:
   case file_magic::elf_core:
+  case file_magic::fatlto_object:
   case file_magic::goff_object:
   case file_magic::macho_object:
   case file_magic::macho_executable:
diff --git a/llvm/lib/Object/ObjectFile.cpp b/llvm/lib/Object/ObjectFile.cpp
--- a/llvm/lib/Object/ObjectFile.cpp
+++ b/llvm/lib/Object/ObjectFile.cpp
@@ -157,6 +157,7 @@
   case file_magic::elf_executable:
   case file_magic::elf_shared_object:
   case file_magic::elf_core:
+  case file_magic::fatlto_object:
     return createELFObjectFile(Object, InitContent);
   case file_magic::macho_object:
   case file_magic::macho_executable: