Index: lld/ELF/Driver.cpp
===================================================================
--- lld/ELF/Driver.cpp
+++ lld/ELF/Driver.cpp
@@ -184,20 +184,18 @@
       error("attempted static link of dynamic object " + Path);
       return;
     }
-    Files.push_back(createSharedFile(MBRef));
 
     // DSOs usually have DT_SONAME tags in their ELF headers, and the
-    // sonames are used to identify DSOs. But if they are missing,
-    // they are identified by filenames. We don't know whether the new
-    // file has a DT_SONAME or not because we haven't parsed it yet.
-    // Here, we set the default soname for the file because we might
-    // need it later.
+    // sonames are used to identify DSOs. But if they are missing
+    // (which is relatively rare), they are identified by filenames.
+    // We are passing the default soname to createSharedFile, but that
+    // string will end up not being used in most cases.
     //
     // If a file was specified by -lfoo, the directory part is not
     // significant, as a user did not specify it. This behavior is
     // compatible with GNU.
-    Files.back()->DefaultSoName =
-        WithLOption ? sys::path::filename(Path) : Path;
+    Files.push_back(createSharedFile(
+        MBRef, WithLOption ? sys::path::filename(Path) : Path));
     return;
   default:
     if (InLib)
Index: lld/ELF/InputFiles.h
===================================================================
--- lld/ELF/InputFiles.h
+++ lld/ELF/InputFiles.h
@@ -93,10 +93,6 @@
   uint16_t EMachine = llvm::ELF::EM_NONE;
   uint8_t OSABI = 0;
 
-  // For SharedKind inputs, the string to use in DT_NEEDED when the library
-  // has no soname.
-  std::string DefaultSoName;
-
   // Cache for toString(). Only toString() should use this member.
   mutable std::string ToStringCache;
 
@@ -160,7 +156,7 @@
   ArrayRef<SymbolBody *> getSymbols();
   ArrayRef<SymbolBody *> getLocalSymbols();
 
-  explicit ObjectFile(MemoryBufferRef M);
+  ObjectFile(MemoryBufferRef M, StringRef ArchiveName);
   void parse(llvm::DenseSet<llvm::CachedHashStringRef> &ComdatGroups);
 
   InputSectionBase *getSection(const Elf_Sym &Sym) const;
@@ -296,7 +292,7 @@
     return F->kind() == Base::SharedKind;
   }
 
-  explicit SharedFile(MemoryBufferRef M);
+  SharedFile(MemoryBufferRef M, StringRef DefaultSoName);
 
   void parseSoName();
   void parseRest();
@@ -314,6 +310,9 @@
   // data structures in the output file.
   std::map<const Elf_Verdef *, NeededVer> VerdefMap;
 
+  // The string to use in DT_NEEDED when the library has no soname.
+  std::string DefaultSoName;
+
   // Used for --as-needed
   bool AsNeeded = false;
   bool IsUsed = false;
@@ -329,7 +328,7 @@
 
 InputFile *createObjectFile(MemoryBufferRef MB, StringRef ArchiveName = "",
                             uint64_t OffsetInArchive = 0);
-InputFile *createSharedFile(MemoryBufferRef MB);
+InputFile *createSharedFile(MemoryBufferRef MB, StringRef DefaultSoName);
 
 } // namespace elf
 } // namespace lld
Index: lld/ELF/InputFiles.cpp
===================================================================
--- lld/ELF/InputFiles.cpp
+++ lld/ELF/InputFiles.cpp
@@ -174,8 +174,10 @@
 }
 
 template <class ELFT>
-elf::ObjectFile<ELFT>::ObjectFile(MemoryBufferRef M)
-    : ELFFileBase<ELFT>(Base::ObjectKind, M) {}
+elf::ObjectFile<ELFT>::ObjectFile(MemoryBufferRef M, StringRef ArchiveName)
+    : ELFFileBase<ELFT>(Base::ObjectKind, M) {
+  this->ArchiveName = ArchiveName;
+}
 
 template <class ELFT>
 ArrayRef<SymbolBody *> elf::ObjectFile<ELFT>::getLocalSymbols() {
@@ -608,8 +610,9 @@
 }
 
 template <class ELFT>
-SharedFile<ELFT>::SharedFile(MemoryBufferRef M)
-    : ELFFileBase<ELFT>(Base::SharedKind, M), AsNeeded(Config->AsNeeded) {}
+SharedFile<ELFT>::SharedFile(MemoryBufferRef M, StringRef DefaultSoName)
+    : ELFFileBase<ELFT>(Base::SharedKind, M), DefaultSoName(DefaultSoName),
+      AsNeeded(Config->AsNeeded) {}
 
 template <class ELFT>
 const typename ELFT::Shdr *
@@ -867,34 +870,24 @@
     Symbols.push_back(createBitcodeSymbol<ELFT>(KeptComdats, ObjSym, this));
 }
 
-template <template <class> class T>
-static InputFile *createELFFile(MemoryBufferRef MB) {
+static ELFKind getELFKind(MemoryBufferRef MB) {
   unsigned char Size;
   unsigned char Endian;
   std::tie(Size, Endian) = getElfArchType(MB.getBuffer());
+
   if (Endian != ELFDATA2LSB && Endian != ELFDATA2MSB)
     fatal(MB.getBufferIdentifier() + ": invalid data encoding");
+  if (Size != ELFCLASS32 && Size != ELFCLASS64)
+    fatal(MB.getBufferIdentifier() + ": invalid file class");
 
   size_t BufSize = MB.getBuffer().size();
   if ((Size == ELFCLASS32 && BufSize < sizeof(Elf32_Ehdr)) ||
       (Size == ELFCLASS64 && BufSize < sizeof(Elf64_Ehdr)))
     fatal(MB.getBufferIdentifier() + ": file is too short");
 
-  InputFile *Obj;
-  if (Size == ELFCLASS32 && Endian == ELFDATA2LSB)
-    Obj = make<T<ELF32LE>>(MB);
-  else if (Size == ELFCLASS32 && Endian == ELFDATA2MSB)
-    Obj = make<T<ELF32BE>>(MB);
-  else if (Size == ELFCLASS64 && Endian == ELFDATA2LSB)
-    Obj = make<T<ELF64LE>>(MB);
-  else if (Size == ELFCLASS64 && Endian == ELFDATA2MSB)
-    Obj = make<T<ELF64BE>>(MB);
-  else
-    fatal(MB.getBufferIdentifier() + ": invalid file class");
-
-  if (!Config->FirstElf)
-    Config->FirstElf = Obj;
-  return Obj;
+  if (Size == ELFCLASS32)
+    return (Endian == ELFDATA2LSB) ? ELF32LEKind : ELF32BEKind;
+  return (Endian == ELFDATA2LSB) ? ELF64LEKind : ELF64BEKind;
 }
 
 template <class ELFT> void BinaryFile::parse() {
@@ -931,15 +924,36 @@
 
 InputFile *elf::createObjectFile(MemoryBufferRef MB, StringRef ArchiveName,
                                  uint64_t OffsetInArchive) {
-  InputFile *F = isBitcode(MB)
-                     ? make<BitcodeFile>(MB, ArchiveName, OffsetInArchive)
-                     : createELFFile<ObjectFile>(MB);
-  F->ArchiveName = ArchiveName;
-  return F;
+  if (isBitcode(MB))
+    return make<BitcodeFile>(MB, ArchiveName, OffsetInArchive);
+
+  switch (getELFKind(MB)) {
+  case ELF32LEKind:
+    return make<ObjectFile<ELF32LE>>(MB, ArchiveName);
+  case ELF32BEKind:
+    return make<ObjectFile<ELF32BE>>(MB, ArchiveName);
+  case ELF64LEKind:
+    return make<ObjectFile<ELF64LE>>(MB, ArchiveName);
+  case ELF64BEKind:
+    return make<ObjectFile<ELF64BE>>(MB, ArchiveName);
+  case ELFNoneKind:
+    llvm_unreachable("getELFKind");
+  }
 }
 
-InputFile *elf::createSharedFile(MemoryBufferRef MB) {
-  return createELFFile<SharedFile>(MB);
+InputFile *elf::createSharedFile(MemoryBufferRef MB, StringRef DefaultSoName) {
+  switch (getELFKind(MB)) {
+  case ELF32LEKind:
+    return make<SharedFile<ELF32LE>>(MB, DefaultSoName);
+  case ELF32BEKind:
+    return make<SharedFile<ELF32BE>>(MB, DefaultSoName);
+  case ELF64LEKind:
+    return make<SharedFile<ELF64LE>>(MB, DefaultSoName);
+  case ELF64BEKind:
+    return make<SharedFile<ELF64BE>>(MB, DefaultSoName);
+  case ELFNoneKind:
+    llvm_unreachable("getELFKind");
+  }
 }
 
 MemoryBufferRef LazyObjectFile::getBuffer() {
@@ -994,17 +1008,18 @@
   if (isBitcode(this->MB))
     return getBitcodeSymbols();
 
-  unsigned char Size;
-  unsigned char Endian;
-  std::tie(Size, Endian) = getElfArchType(this->MB.getBuffer());
-  if (Size == ELFCLASS32) {
-    if (Endian == ELFDATA2LSB)
-      return getElfSymbols<ELF32LE>();
+  switch (getELFKind(this->MB)) {
+  case ELF32LEKind:
+    return getElfSymbols<ELF32LE>();
+  case ELF32BEKind:
     return getElfSymbols<ELF32BE>();
-  }
-  if (Endian == ELFDATA2LSB)
+  case ELF64LEKind:
     return getElfSymbols<ELF64LE>();
-  return getElfSymbols<ELF64BE>();
+  case ELF64BEKind:
+    return getElfSymbols<ELF64BE>();
+  case ELFNoneKind:
+    llvm_unreachable("getELFKind");
+  }
 }
 
 template void ArchiveFile::parse<ELF32LE>();
Index: lld/ELF/SymbolTable.cpp
===================================================================
--- lld/ELF/SymbolTable.cpp
+++ lld/ELF/SymbolTable.cpp
@@ -52,6 +52,9 @@
 
 // Add symbols in File to the symbol table.
 template <class ELFT> void SymbolTable<ELFT>::addFile(InputFile *File) {
+  if (!Config->FirstElf && isa<ELFFileBase<ELFT>>(File))
+    Config->FirstElf = File;
+
   if (!isCompatible<ELFT>(File))
     return;