Tune CMakeLists for out-of-tree build.

Adjust for API discrepancies between Apple clang-8.0.0 and upstream LLVM 5.0.1.

Allow all clients to link against the library, not just ld. Main reason: Our ld
is called ld64 when we link it.

--- tapi-2.0.0/tools/tapi/CMakeLists.txt.orig	2017-12-25 22:36:06.620886714 +0100
+++ tapi-2.0.0/tools/tapi/CMakeLists.txt	2017-12-25 22:41:43.867893060 +0100
@@ -6,6 +6,12 @@
 
 target_link_libraries(tapi
   tapiDriver
+  clangAST
+  clangFrontend
+  LLVMOption
+  LLVMDemangle
+  LLVMSupport
+  LLVMCore
   )
 
 if (TAPI_BUILD_LIBIOSSDK)
--- tapi-2.0.0/tools/libtapi/CMakeLists.txt.orig	2017-12-25 22:26:06.816905789 +0100
+++ tapi-2.0.0/tools/libtapi/CMakeLists.txt	2017-12-25 22:31:22.914862289 +0100
@@ -1,4 +1,7 @@
 set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/libtapi.exports)
+set(LLVM_LINK_COMPONENTS
+  Support
+  )
 
 add_tapi_library(libtapi
   SHARED
@@ -19,5 +22,5 @@
 
 set_property(TARGET libtapi APPEND_STRING
   PROPERTY
-  LINK_FLAGS " -current_version ${TAPI_FULL_VERSION} -compatibility_version 1 -allowable_client ld"
+  LINK_FLAGS " -current_version ${TAPI_FULL_VERSION} -compatibility_version 1"
   )
--- tapi-2.0.0/tools/tapi-run/CMakeLists.txt.orig	2017-12-26 15:12:39.605057352 +0100
+++ tapi-2.0.0/tools/tapi-run/CMakeLists.txt	2017-12-26 15:15:53.304983942 +0100
@@ -5,6 +5,8 @@
 target_link_libraries(tapi-run
   tapiCore
   libtapi
+  LLVMSupport
+  LLVMCore
   )
 
 set_property(TARGET tapi-run APPEND_STRING
--- tapi-2.0.0/CMakeLists.txt.orig	2017-12-24 15:27:56.000000000 +0100
+++ tapi-2.0.0/CMakeLists.txt	2017-12-26 15:50:01.199506782 +0100
@@ -4,6 +4,24 @@
   message(FATAL_ERROR "Unsupported configuration.")
 endif()
 
+project(tapi)
+set(PACKAGE_VENDOR Apple CACHE STRING "")
+add_definitions(-DTAPI_BUG_REPORT_URL="https://bugs.gentoo.org/")
+
+find_package(LLVM REQUIRED CONFIG)
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+include(AddLLVM)
+
+add_definitions(${LLVM_DEFINITIONS})
+include_directories(${LLVM_INCLUDE_DIRS} ${OBJCMETADATA_INCLUDE_DIRS})
+link_directories(${LLVM_LIBRARY_DIRS} ${OBJCMETADATA_LIBRARY_DIRS})
+
+# make tblgen happy
+include(TableGen)
+foreach(IPATH ${LLVM_INCLUDE_DIRS})
+  list(APPEND LLVM_TABLEGEN_FLAGS -I ${IPATH})
+endforeach(IPATH)
+
 set(TAPI_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 set(TAPI_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
--- tapi-2.0.0/lib/Core/MachODylibReader.cpp.orig	2017-12-24 15:27:56.000000000 +0100
+++ tapi-2.0.0/lib/Core/MachODylibReader.cpp	2017-12-25 22:15:53.075478606 +0100
@@ -254,8 +254,7 @@
   auto arch = getArchType(H.cputype, H.cpusubtype);
   assert(arch != Architecture::unknown && "unknown architecture slice");
 
-  Error error = Error::success();
-  for (const auto &symbol : object->exports(error)) {
+  for (const auto &symbol : object->exports()) {
     StringRef name;
     XPIKind kind;
     std::tie(name, kind) = parseSymbol(symbol.name());
@@ -272,7 +271,7 @@
     file->addSymbol(kind, name, arch, flags);
   }
 
-  return error;
+  return Error::success();
 }
 
 static Error readUndefinedSymbols(MachOObjectFile *object,
@@ -309,10 +308,7 @@
   auto H = object->getHeader();
   auto arch = getArchType(H.cputype, H.cpusubtype);
 
-  auto error = Error::success();
-  MachOMetadata metadata(object, error);
-  if (error)
-    return std::move(error);
+  MachOMetadata metadata(object);
 
   ///
   /// Classes
--- tapi-2.0.0/lib/Driver/Snapshot.cpp.orig	2017-12-24 15:27:56.000000000 +0100
+++ tapi-2.0.0/lib/Driver/Snapshot.cpp	2017-12-26 15:49:09.864184826 +0100
@@ -14,7 +14,7 @@
 #include "tapi/Defines.h"
 #include "clang/Frontend/FrontendOptions.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/Config/config.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/xxhash.h"
@@ -356,7 +356,7 @@
   }
 
   if (isCrash) {
-    outs() << "PLEASE submit a bug report to " BUG_REPORT_URL
+    outs() << "PLEASE submit a bug report to " TAPI_BUG_REPORT_URL
               " and include the "
               "crash backtrace and snapshot.\n\n"
               "********************************************************\n\n"
--- tapi-2.0.0/lib/Driver/Options.cpp.orig	2017-12-25 22:17:40.506874748 +0100
+++ tapi-2.0.0/lib/Driver/Options.cpp	2017-12-25 22:18:04.181989766 +0100
@@ -1023,7 +1023,7 @@
   table->PrintHelp(
       outs(),
       (programName + " " + getNameFromTAPICommand(command)).str().c_str(),
-      toolName, /*FlagsToInclude=*/getIncludeOptionFlagMasks(command),
+      toolName, /*FlagsToInclude=*///getIncludeOptionFlagMasks(command),
       /*FlagsToExclude=*/0, /*ShowAllAliases=*/false);
 }