diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -27,6 +27,7 @@
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/BinaryFormat/Magic.h"
+#include "llvm/LTO/LTO.h"
 #include "llvm/Object/ArchiveWriter.h"
 #include "llvm/Object/COFFImportFile.h"
 #include "llvm/Object/COFFModuleDefinition.h"
@@ -1070,12 +1071,6 @@
   });
 }
 
-static const char *libcallRoutineNames[] = {
-#define HANDLE_LIBCALL(code, name) name,
-#include "llvm/IR/RuntimeLibcalls.def"
-#undef HANDLE_LIBCALL
-};
-
 void LinkerDriver::link(ArrayRef<const char *> argsArr) {
   // Needed for LTO.
   InitializeAllTargetInfos();
@@ -1804,7 +1799,7 @@
     // bitcode file in an archive member, we need to arrange to use LTO to
     // compile those archive members by adding them to the link beforehand.
     if (!BitcodeFile::instances.empty())
-      for (const char *s : libcallRoutineNames)
+      for (auto *s : lto::LTO::getRuntimeLibcallSymbols())
         symtab->addLibcall(s);
 
     // Windows specific -- if __load_config_used can be resolved, resolve it.
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -48,6 +48,7 @@
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringSwitch.h"
+#include "llvm/LTO/LTO.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compression.h"
 #include "llvm/Support/GlobPattern.h"
@@ -1668,12 +1669,6 @@
   return ret;
 }
 
-static const char *libcallRoutineNames[] = {
-#define HANDLE_LIBCALL(code, name) name,
-#include "llvm/IR/RuntimeLibcalls.def"
-#undef HANDLE_LIBCALL
-};
-
 // Do actual linking. Note that when this function is called,
 // all linker scripts have already been parsed.
 template <class ELFT> void LinkerDriver::link(opt::InputArgList &args) {
@@ -1764,7 +1759,7 @@
   // libcall symbols will be added to the link after LTO when we add the LTO
   // object file to the link.
   if (!bitcodeFiles.empty())
-    for (const char *s : libcallRoutineNames)
+    for (auto *s : lto::LTO::getRuntimeLibcallSymbols())
       handleLibcall(s);
 
   // Return if there were name resolution errors.
diff --git a/llvm/include/llvm-c/lto.h b/llvm/include/llvm-c/lto.h
--- a/llvm/include/llvm-c/lto.h
+++ b/llvm/include/llvm-c/lto.h
@@ -44,7 +44,7 @@
  * @{
  */
 
-#define LTO_API_VERSION 24
+#define LTO_API_VERSION 25
 
 /**
  * \since prior to LTO_API_VERSION=3
@@ -592,6 +592,14 @@
                                                     size_t index,
                                                     size_t *size);
 
+/**
+ * Returns the list of libcall symbols that can be generated by LTO
+ * that might not be visible from the symbol table of bitcode files.
+ *
+ * \since prior to LTO_API_VERSION=25
+ */
+extern const char *const *lto_runtime_lib_symbols_list(size_t *size);
+
 /**
  * @} // endgoup LLVMCLTO
  * @defgroup LLVMCTLTO ThinLTO
diff --git a/llvm/include/llvm/LTO/LTO.h b/llvm/include/llvm/LTO/LTO.h
--- a/llvm/include/llvm/LTO/LTO.h
+++ b/llvm/include/llvm/LTO/LTO.h
@@ -298,6 +298,10 @@
   /// Cache) for each task identifier.
   Error run(AddStreamFn AddStream, NativeObjectCache Cache = nullptr);
 
+  /// Static method that returns a list of libcall symbols that can be generated
+  /// by LTO but might not be visible from bitcode symbol table.
+  static ArrayRef<const char*> getRuntimeLibcallSymbols();
+
 private:
   Config Conf;
 
diff --git a/llvm/lib/LTO/LTO.cpp b/llvm/lib/LTO/LTO.cpp
--- a/llvm/lib/LTO/LTO.cpp
+++ b/llvm/lib/LTO/LTO.cpp
@@ -1011,6 +1011,16 @@
                  std::move(RegularLTO.CombinedModule), ThinLTO.CombinedIndex);
 }
 
+static const char *libcallRoutineNames[] = {
+#define HANDLE_LIBCALL(code, name) name,
+#include "llvm/IR/RuntimeLibcalls.def"
+#undef HANDLE_LIBCALL
+};
+
+ArrayRef<const char*> LTO::getRuntimeLibcallSymbols() {
+  return makeArrayRef(libcallRoutineNames);
+}
+
 /// This class defines the interface to the ThinLTO backend.
 class lto::ThinBackendProc {
 protected:
diff --git a/llvm/tools/lto/lto.cpp b/llvm/tools/lto/lto.cpp
--- a/llvm/tools/lto/lto.cpp
+++ b/llvm/tools/lto/lto.cpp
@@ -652,3 +652,9 @@
                                                    size_t *size) {
   return LTOModule::getDependentLibrary(unwrap(input), index, size);
 }
+
+extern const char *const *lto_runtime_lib_symbols_list(size_t *size) {
+  auto symbols = lto::LTO::getRuntimeLibcallSymbols();
+  *size = symbols.size();
+  return symbols.data();
+}
diff --git a/llvm/tools/lto/lto.exports b/llvm/tools/lto/lto.exports
--- a/llvm/tools/lto/lto.exports
+++ b/llvm/tools/lto/lto.exports
@@ -76,3 +76,4 @@
 lto_input_dispose
 lto_input_get_num_dependent_libraries
 lto_input_get_dependent_library
+lto_runtime_lib_symbols_list