Define ErrorInfo::ID explicitly.

llvm-svn: 264293

llvm/unittests/Support/ErrorTest.cpp

@@ -45,6 +45,8 @@ protected:
   int Info;
 };
 
+template <> char ErrorInfo<CustomError>::ID = 0;
+
 // Custom error class with a custom base class and some additional random
 // 'info'.
 class CustomSubError : public ErrorInfo<CustomSubError, CustomError> {
@@ -70,6 +72,8 @@ protected:
   int ExtraInfo;
 };
 
+template <> char ErrorInfo<CustomSubError, CustomError>::ID = 0;
+
 static Error handleCustomError(const CustomError &CE) { return Error(); }
 
 static void handleCustomErrorVoid(const CustomError &CE) {}