Defining a new API for debug options that doesn't rely on static global cl::opts.

Summary:
This is based on the discussions from the LLVMDev thread:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075886.html

Reviewers: chandlerc

Reviewed By: chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5389

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219854 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Options.cpp

@@ -0,0 +1,33 @@
+//===- llvm/Support/Options.cpp - Debug options support ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the helper objects for defining debug options using the
+// new API built on cl::opt, but not requiring the use of static globals.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Options.h"
+#include "llvm/Support/ManagedStatic.h"
+
+using namespace llvm;
+
+OptionRegistry::~OptionRegistry() {
+  for (auto IT = Options.begin(); IT != Options.end(); ++IT)
+    delete IT->second;
+}
+
+void OptionRegistry::addOption(void *Key, cl::Option *O) {
+  assert(Options.find(Key) == Options.end() &&
+         "Argument with this key already registerd");
+  Options.insert(std::make_pair(Key, O));
+}
+
+static ManagedStatic<OptionRegistry> OR;
+
+OptionRegistry &OptionRegistry::instance() { return *OR; }