Index: include/llvm/Support/Error.h
===================================================================
--- include/llvm/Support/Error.h
+++ include/llvm/Support/Error.h
@@ -24,6 +24,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>
@@ -1121,6 +1122,16 @@
   std::error_code EC;
 };
 
+/// Create formatted StringError object.
+template <typename... Ts>
+Error createStringError(std::error_code EC, char const *Fmt,
+                        const Ts &... Vals) {
+  std::string Buffer;
+  raw_string_ostream Stream(Buffer);
+  Stream << format(Fmt, Vals...);
+  return make_error<StringError>(Stream.str(), EC);
+}
+
 /// Helper for check-and-exit error handling.
 ///
 /// For tool use only. NOT FOR USE IN LIBRARY CODE.
Index: unittests/Support/ErrorTest.cpp
===================================================================
--- unittests/Support/ErrorTest.cpp
+++ unittests/Support/ErrorTest.cpp
@@ -443,6 +443,23 @@
     << "Failed to convert StringError to error_code.";
 }
 
+TEST(Error, createStringError) {
+  static const char *Bar = "bar";
+  static const std::error_code EC = errc::invalid_argument;
+  std::string Msg;
+  raw_string_ostream S(Msg);
+  logAllUnhandledErrors(createStringError(EC, "foo%s%d0x%" PRIx8, Bar, 1, 0xff),
+                        S, "");
+  EXPECT_EQ(S.str(), "foobar10xff\n")
+    << "Unexpected createStringError() log result";
+
+  S.flush();
+  Msg.clear();
+  auto Res = errorToErrorCode(createStringError(EC, "foo%s", Bar));
+  EXPECT_EQ(Res, EC)
+    << "Failed to convert createStringError() result to error_code.";
+}
+
 // Test that the ExitOnError utility works as expected.
 TEST(Error, ExitOnError) {
   ExitOnError ExitOnErr;