Provide standalone cmake project file that allows compilation outside the LLVM
source tree and installs the headers as well.

Tune other CMakeLists for out-of-tree build.

Provide missing isDynamic() method for Objective C properties. (Best-guess
implementation based on
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtPropertyIntrospection.html
and llvm-objdump -m -objc-meta-data output). Does not seem to be used anywhere
anyways - but the control flow of the code is somewhat encrypted.

Adjust to some minor API differencies between Apple clang 8.0.0 and upstream
LLVM 5.0.1.

--- objcmetadata-800.0.42.1/CMakeLists.txt.orig	2017-12-25 22:23:41.000000000 +0100
+++ objcmetadata-800.0.42.1/CMakeLists.txt	2017-12-25 20:54:39.000000000 +0100
@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.4.3)
+project(ObjCMetadata)
+
+find_package(LLVM REQUIRED CONFIG)
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+include(AddLLVM)
+
+include_directories(${LLVM_INCLUDE_DIRS})
+link_directories(${LLVM_LIBRARY_DIRS})
+add_definitions(${LLVM_DEFINITIONS})
+set(LLVM_COMMON_LIBS Object Support Analysis Core)
+
+include_directories(BEFORE
+  ${CMAKE_CURRENT_BINARY_DIR}/include
+  ${CMAKE_CURRENT_SOURCE_DIR}/include
+  )
+
+install(FILES
+  include/llvm/${PROJECT_NAME}/ObjCBitcode.h
+  include/llvm/${PROJECT_NAME}/ObjCMachOBinary.h
+  include/llvm/${PROJECT_NAME}/ObjCMetadata.h
+  DESTINATION include/llvm/${PROJECT_NAME}
+  )
+
+add_subdirectory(lib/${PROJECT_NAME})
--- objcmetadata-800.0.42.1/include/llvm/ObjCMetadata/ObjCMetadata.h.orig	2017-12-25 20:09:28.000000000 +0100
+++ objcmetadata-800.0.42.1/include/llvm/ObjCMetadata/ObjCMetadata.h	2017-12-25 20:10:11.000000000 +0100
@@ -110,6 +110,7 @@
   // Return empty string if doesn't exists.
   Expected<std::string> getGetter() const;
   Expected<std::string> getSetter() const;
+  Expected<bool> isDynamic() const;
 };
 
 class ObjCMethod : public ObjCInfoBase {
--- objcmetadata-800.0.42.1/lib/ObjCMetadata/ObjCMetadata.cpp.orig	2017-12-25 20:09:11.000000000 +0100
+++ objcmetadata-800.0.42.1/lib/ObjCMetadata/ObjCMetadata.cpp	2017-12-25 20:13:33.000000000 +0100
@@ -164,6 +164,20 @@
   return setter;
 }
 
+Expected<bool> ObjCProperty::isDynamic() const {
+  auto Attr = getAttribute();
+  if (!Attr)
+    return Attr.takeError();
+  // Find setter attribute.
+  SmallVector<StringRef, 4> Attrs;
+  Attr->split(Attrs, ',');
+  for (auto a : Attrs) {
+    if (a == "D")
+      return true;
+  }
+  return false;
+}
+
 Expected<StringRef> ObjCMethod::getName() const {
   return MetadataReader->getMethodName(*this);
 }
--- objcmetadata-800.0.42.1/lib/ObjCMetadata/CMakeLists.txt.orig	2017-12-25 17:29:01.000000000 +0100
+++ objcmetadata-800.0.42.1/lib/ObjCMetadata/CMakeLists.txt	2017-12-25 20:59:31.000000000 +0100
@@ -1,3 +1,10 @@
+set(LLVM_LINK_COMPONENTS
+  Object
+  Support
+  Analysis
+  Core
+)
+
 add_llvm_library(LLVMObjCMetadata
   ObjCBitcode.cpp
   ObjCMetadata.cpp
@@ -5,7 +12,4 @@
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/ObjCMetadata
-
-  DEPENDS
-  intrinsics_gen
   )
--- objcmetadata-800.0.42.1/lib/ObjCMetadata/ObjCBitcode.cpp.orig	2017-12-25 17:14:29.000000000 +0100
+++ objcmetadata-800.0.42.1/lib/ObjCMetadata/ObjCBitcode.cpp	2017-12-25 17:17:51.000000000 +0100
@@ -20,7 +20,7 @@
 #include "llvm/IR/GlobalAlias.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/Operator.h"
-#include "llvm/Support/Error.h"
+#include "llvm/Object/Error.h"
 
 #include "macho-obj.h"
 
@@ -75,7 +75,7 @@
                Operator::getOpcode(V) == Instruction::AddrSpaceCast) {
       V = cast<Operator>(V)->getOperand(0);
     } else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V)) {
-      if (GA->mayBeOverridden())
+      if (GA->isInterposable())
         return V;
       V = GA->getAliasee();
     } else if (PtrToIntOperator *PTI = dyn_cast<PtrToIntOperator>(V)) {
--- objcmetadata-800.0.42.1/lib/ObjCMetadata/ObjCMachOBinary.cpp.orig	2017-12-25 17:24:23.000000000 +0100
+++ objcmetadata-800.0.42.1/lib/ObjCMetadata/ObjCMachOBinary.cpp	2017-12-25 17:27:15.000000000 +0100
@@ -1262,9 +1262,9 @@
   const char *SymbolName = nullptr;
   if (reloc_found && isExtern) {
     offset = Symbol.getValue();
-    ErrorOr<StringRef> NameOrError = Symbol.getName();
+    Expected<StringRef> NameOrError = Symbol.getName();
     if (!NameOrError) {
-      return errorOrToExpected(std::move(NameOrError));
+      return NameOrError;
     }
     StringRef Name = *NameOrError;
     if (!Name.empty()) {