3 files changed, 551 insertions, 0 deletions
diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index d15fdbe..57b7b25 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -710,6 +710,8 @@ if (WIN32)
       cmGhsMultiTargetGenerator.h
       cmGhsMultiGpj.cxx
       cmGhsMultiGpj.h
+      cmVSSetupHelper.cxx
+      cmVSSetupHelper.h
       )
 
     # Add a manifest file to executables on Windows to allow for
diff --git a/Source/cmVSSetupHelper.cxx b/Source/cmVSSetupHelper.cxx
new file mode 100644
index 0000000..d675a2c
--- /dev/null
+++ b/Source/cmVSSetupHelper.cxx
@@ -0,0 +1,395 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmVSSetupHelper.h"
+
+#ifndef VSSetupConstants
+#define VSSetupConstants
+/* clang-format off */
+const IID IID_ISetupConfiguration = {
+  0x42843719, 0xDB4C, 0x46C2,
+  { 0x8E, 0x7C, 0x64, 0xF1, 0x81, 0x6E, 0xFD, 0x5B }
+};
+const IID IID_ISetupConfiguration2 = {
+  0x26AAB78C, 0x4A60, 0x49D6,
+  { 0xAF, 0x3B, 0x3C, 0x35, 0xBC, 0x93, 0x36, 0x5D }
+};
+const IID IID_ISetupPackageReference = {
+  0xda8d8a16, 0xb2b6, 0x4487,
+  { 0xa2, 0xf1, 0x59, 0x4c, 0xcc, 0xcd, 0x6b, 0xf5 }
+};
+const IID IID_ISetupHelper = {
+  0x42b21b78, 0x6192, 0x463e,
+  { 0x87, 0xbf, 0xd5, 0x77, 0x83, 0x8f, 0x1d, 0x5c }
+};
+const IID IID_IEnumSetupInstances = {
+  0x6380BCFF, 0x41D3, 0x4B2E,
+  { 0x8B, 0x2E, 0xBF, 0x8A, 0x68, 0x10, 0xC8, 0x48 }
+};
+const IID IID_ISetupInstance2 = {
+  0x89143C9A, 0x05AF, 0x49B0,
+  { 0xB7, 0x17, 0x72, 0xE2, 0x18, 0xA2, 0x18, 0x5C }
+};
+const IID IID_ISetupInstance = {
+  0xB41463C3, 0x8866, 0x43B5,
+  { 0xBC, 0x33, 0x2B, 0x06, 0x76, 0xF7, 0xF4, 0x2E }
+};
+const CLSID CLSID_SetupConfiguration = {
+  0x177F0C4A, 0x1CD3, 0x4DE7,
+  { 0xA3, 0x2C, 0x71, 0xDB, 0xBB, 0x9F, 0xA3, 0x6D }
+};
+/* clang-format on */
+#endif
+
+const WCHAR* VCToolsetComponent =
+  L"Microsoft.VisualStudio.Component.VC.Tools.x86.x64";
+const WCHAR* Win10SDKComponent =
+  L"Microsoft.VisualStudio.Component.Windows10SDK";
+const WCHAR* Win81SDKComponent =
+  L"Microsoft.VisualStudio.Component.Windows81SDK";
+const WCHAR* ComponentType = L"Component";
+
+cmVSSetupAPIHelper::cmVSSetupAPIHelper()
+  : setupConfig(NULL)
+  , setupConfig2(NULL)
+  , setupHelper(NULL)
+  , initializationFailure(false)
+{
+  comInitialized = CoInitializeEx(NULL, 0);
+  if (SUCCEEDED(comInitialized)) {
+    Initialize();
+  } else {
+    initializationFailure = true;
+  }
+}
+
+cmVSSetupAPIHelper::~cmVSSetupAPIHelper()
+{
+  setupHelper = NULL;
+  setupConfig2 = NULL;
+  setupConfig = NULL;
+  if (SUCCEEDED(comInitialized))
+    CoUninitialize();
+}
+
+bool cmVSSetupAPIHelper::IsVS2017Installed()
+{
+  bool ret = false;
+  if (chosenInstanceInfo.VSInstallLocation.compare(L"") == 0) {
+    ret = EnumerateAndChooseVSInstance();
+  }
+
+  return ret;
+}
+
+bool cmVSSetupAPIHelper::IsWin10SDKInstalled()
+{
+  bool isWin10SDKInstalled = false;
+  if (chosenInstanceInfo.VSInstallLocation.compare(L"") == 0) {
+    if (EnumerateAndChooseVSInstance() &&
+        chosenInstanceInfo.VSInstallLocation.compare(L"") != 0) {
+      isWin10SDKInstalled = chosenInstanceInfo.IsWin10SDKInstalled;
+    }
+  } else {
+    isWin10SDKInstalled = chosenInstanceInfo.IsWin10SDKInstalled;
+  }
+
+  return isWin10SDKInstalled;
+}
+
+bool cmVSSetupAPIHelper::IsWin81SDKInstalled()
+{
+  bool isWin81SDKInstalled = false;
+  if (chosenInstanceInfo.VSInstallLocation.compare(L"") == 0) {
+    if (EnumerateAndChooseVSInstance() &&
+        chosenInstanceInfo.VSInstallLocation.compare(L"") != 0) {
+      isWin81SDKInstalled = chosenInstanceInfo.IsWin81SDKInstalled;
+    }
+  } else {
+    isWin81SDKInstalled = chosenInstanceInfo.IsWin81SDKInstalled;
+  }
+
+  return isWin81SDKInstalled;
+}
+
+bool cmVSSetupAPIHelper::CheckInstalledComponent(
+  SmartCOMPtr<ISetupPackageReference> package, bool& bVCToolset,
+  bool& bWin10SDK, bool& bWin81SDK)
+{
+  bool ret = false;
+  bVCToolset = bWin10SDK = bWin81SDK = false;
+  SmartBSTR bstrId;
+  if (FAILED(package->GetId(&bstrId))) {
+    return ret;
+  }
+
+  SmartBSTR bstrType;
+  if (FAILED(package->GetType(&bstrType))) {
+    return ret;
+  }
+
+  std::wstring id = std::wstring(bstrId);
+  std::wstring type = std::wstring(bstrType);
+  if (id.compare(VCToolsetComponent) == 0 &&
+      type.compare(ComponentType) == 0) {
+    bVCToolset = true;
+    ret = true;
+  }
+
+  // Checks for any version of Win10 SDK. The version is appended at the end of
+  // the
+  // component name ex: Microsoft.VisualStudio.Component.Windows10SDK.10240
+  if (id.find(Win10SDKComponent) != std::wstring::npos &&
+      type.compare(ComponentType) == 0) {
+    bWin10SDK = true;
+    ret = true;
+  }
+
+  if (id.compare(Win81SDKComponent) == 0 && type.compare(ComponentType) == 0) {
+    bWin81SDK = true;
+    ret = true;
+  }
+
+  return ret;
+}
+
+// Gather additional info such as if VCToolset, WinSDKs are installed, location
+// of VS and version information.
+bool cmVSSetupAPIHelper::GetVSInstanceInfo(
+  SmartCOMPtr<ISetupInstance2> pInstance, VSInstanceInfo& vsInstanceInfo)
+{
+  bool isVCToolSetInstalled = false;
+  if (pInstance == NULL)
+    return false;
+
+  SmartBSTR bstrId;
+  if (SUCCEEDED(pInstance->GetInstanceId(&bstrId))) {
+    vsInstanceInfo.InstanceId = std::wstring(bstrId);
+  } else {
+    return false;
+  }
+
+  InstanceState state;
+  if (FAILED(pInstance->GetState(&state))) {
+    return false;
+  }
+
+  ULONGLONG ullVersion = 0;
+  SmartBSTR bstrVersion;
+  if (FAILED(pInstance->GetInstallationVersion(&bstrVersion))) {
+    return false;
+  } else {
+    vsInstanceInfo.Version = std::wstring(bstrVersion);
+    if (FAILED(setupHelper->ParseVersion(bstrVersion, &ullVersion))) {
+      vsInstanceInfo.ullVersion = 0;
+    } else {
+      vsInstanceInfo.ullVersion = ullVersion;
+    }
+  }
+
+  // Reboot may have been required before the installation path was created.
+  SmartBSTR bstrInstallationPath;
+  if ((eLocal & state) == eLocal) {
+    if (FAILED(pInstance->GetInstallationPath(&bstrInstallationPath))) {
+      return false;
+    } else {
+      vsInstanceInfo.VSInstallLocation = std::wstring(bstrInstallationPath);
+    }
+  }
+
+  // Reboot may have been required before the product package was registered
+  // (last).
+  if ((eRegistered & state) == eRegistered) {
+    SmartCOMPtr<ISetupPackageReference> product;
+    if (FAILED(pInstance->GetProduct(&product)) || !product) {
+      return false;
+    }
+
+    LPSAFEARRAY lpsaPackages;
+    if (FAILED(pInstance->GetPackages(&lpsaPackages)) ||
+        lpsaPackages == NULL) {
+      return false;
+    }
+
+    int lower = lpsaPackages->rgsabound[0].lLbound;
+    int upper = lpsaPackages->rgsabound[0].cElements + lower;
+
+    IUnknown** ppData = (IUnknown**)lpsaPackages->pvData;
+    for (int i = lower; i < upper; i++) {
+      SmartCOMPtr<ISetupPackageReference> package = NULL;
+      if (FAILED(ppData[i]->QueryInterface(IID_ISetupPackageReference,
+                                           (void**)&package)) ||
+          package == NULL)
+        continue;
+
+      bool vcToolsetInstalled = false, win10SDKInstalled = false,
+           win81SDkInstalled = false;
+      bool ret = CheckInstalledComponent(package, vcToolsetInstalled,
+                                         win10SDKInstalled, win81SDkInstalled);
+      if (ret) {
+        isVCToolSetInstalled |= vcToolsetInstalled;
+        vsInstanceInfo.IsWin10SDKInstalled |= win10SDKInstalled;
+        vsInstanceInfo.IsWin81SDKInstalled |= win81SDkInstalled;
+      }
+    }
+
+    SafeArrayDestroy(lpsaPackages);
+  }
+
+  return isVCToolSetInstalled;
+}
+
+bool cmVSSetupAPIHelper::GetVSInstanceInfo(std::string& vsInstallLocation)
+{
+  vsInstallLocation = "";
+  bool isInstalled = false;
+
+  if (chosenInstanceInfo.VSInstallLocation.compare(L"") == 0) {
+    isInstalled = EnumerateAndChooseVSInstance();
+  }
+
+  // Enumerate and choose best VS instance
+  if (chosenInstanceInfo.VSInstallLocation.compare(L"") != 0) {
+    std::string str(chosenInstanceInfo.VSInstallLocation.begin(),
+                    chosenInstanceInfo.VSInstallLocation.end());
+    vsInstallLocation = str;
+    isInstalled = true;
+  }
+
+  return isInstalled;
+}
+
+bool cmVSSetupAPIHelper::EnumerateAndChooseVSInstance()
+{
+  bool isVSInstanceExists = false;
+  if (chosenInstanceInfo.VSInstallLocation.compare(L"") != 0) {
+    return true;
+  }
+
+  if (initializationFailure || setupConfig == NULL || setupConfig2 == NULL ||
+      setupHelper == NULL)
+    return false;
+
+  std::vector<VSInstanceInfo> vecVSInstances;
+  SmartCOMPtr<IEnumSetupInstances> enumInstances = NULL;
+  if (FAILED(
+        setupConfig2->EnumInstances((IEnumSetupInstances**)&enumInstances)) ||
+      !enumInstances) {
+    return false;
+  }
+
+  SmartCOMPtr<ISetupInstance> instance;
+  while (SUCCEEDED(enumInstances->Next(1, &instance, NULL)) && instance) {
+    SmartCOMPtr<ISetupInstance2> instance2 = NULL;
+    if (FAILED(
+          instance->QueryInterface(IID_ISetupInstance2, (void**)&instance2)) ||
+        !instance2) {
+      instance = NULL;
+      continue;
+    }
+
+    VSInstanceInfo instanceInfo;
+    bool isInstalled = GetVSInstanceInfo(instance2, instanceInfo);
+    instance = instance2 = NULL;
+
+    if (isInstalled) {
+      vecVSInstances.push_back(instanceInfo);
+    }
+  }
+
+  if (vecVSInstances.size() > 0) {
+    isVSInstanceExists = true;
+    int index = ChooseVSInstance(vecVSInstances);
+    chosenInstanceInfo = vecVSInstances[index];
+  }
+
+  return isVSInstanceExists;
+}
+
+int cmVSSetupAPIHelper::ChooseVSInstance(
+  const std::vector<VSInstanceInfo>& vecVSInstances)
+{
+  if (vecVSInstances.size() == 0)
+    return -1;
+
+  if (vecVSInstances.size() == 1)
+    return 0;
+
+  unsigned int chosenIndex = 0;
+  for (unsigned int i = 1; i < vecVSInstances.size(); i++) {
+    // If the current has Win10 SDK but not the chosen one, then choose the
+    // current VS instance
+    if (!vecVSInstances[chosenIndex].IsWin10SDKInstalled &&
+        vecVSInstances[i].IsWin10SDKInstalled) {
+      chosenIndex = i;
+      continue;
+    }
+
+    // If the chosen one has Win10 SDK but the current one is not, then look at
+    // the next VS instance even the current
+    // instance version may be higher
+    if (vecVSInstances[chosenIndex].IsWin10SDKInstalled &&
+        !vecVSInstances[i].IsWin10SDKInstalled) {
+      continue;
+    }
+
+    // If both chosen one and current one doesn't have Win10 SDK but the
+    // current one has Win8.1 SDK installed,
+    // then choose the current one
+    if (!vecVSInstances[chosenIndex].IsWin10SDKInstalled &&
+        !vecVSInstances[i].IsWin10SDKInstalled &&
+        !vecVSInstances[chosenIndex].IsWin81SDKInstalled &&
+        vecVSInstances[i].IsWin81SDKInstalled) {
+      chosenIndex = i;
+      continue;
+    }
+
+    // If there is no difference in WinSDKs then look for the highest version
+    // of installed VS
+    if ((vecVSInstances[chosenIndex].IsWin10SDKInstalled ==
+         vecVSInstances[i].IsWin10SDKInstalled) &&
+        (vecVSInstances[chosenIndex].IsWin81SDKInstalled ==
+         vecVSInstances[i].IsWin81SDKInstalled) &&
+        vecVSInstances[chosenIndex].Version < vecVSInstances[i].Version) {
+      chosenIndex = i;
+      continue;
+    }
+  }
+
+  return chosenIndex;
+}
+
+bool cmVSSetupAPIHelper::Initialize()
+{
+  if (initializationFailure)
+    return false;
+
+  if (FAILED(comInitialized)) {
+    initializationFailure = true;
+    return false;
+  }
+
+  if (FAILED(setupConfig.CoCreateInstance(CLSID_SetupConfiguration, NULL,
+                                          IID_ISetupConfiguration,
+                                          CLSCTX_INPROC_SERVER)) ||
+      setupConfig == NULL) {
+    initializationFailure = true;
+    return false;
+  }
+
+  if (FAILED(setupConfig.QueryInterface(IID_ISetupConfiguration2,
+                                        (void**)&setupConfig2)) ||
+      setupConfig2 == NULL) {
+    initializationFailure = true;
+    return false;
+  }
+
+  if (FAILED(
+        setupConfig.QueryInterface(IID_ISetupHelper, (void**)&setupHelper)) ||
+      setupHelper == NULL) {
+    initializationFailure = true;
+    return false;
+  }
+
+  initializationFailure = false;
+  return true;
+}
diff --git a/Source/cmVSSetupHelper.h b/Source/cmVSSetupHelper.h
new file mode 100644
index 0000000..d2f514c
--- /dev/null
+++ b/Source/cmVSSetupHelper.h
@@ -0,0 +1,154 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmVSSetupHelper_h
+#define cmVSSetupHelper_h
+
+#ifndef NOMINMAX
+#define NOMINMAX // Undefine min and max defined by windows.h
+#endif
+
+// Published by Visual Studio Setup team
+#include "cmvssetup/Setup.Configuration.h"
+
+#include <string>
+#include <vector>
+
+#include <windows.h>
+
+template <class T>
+class SmartCOMPtr
+{
+public:
+  SmartCOMPtr() { ptr = NULL; }
+  SmartCOMPtr(T* p)
+  {
+    ptr = p;
+    if (ptr != NULL)
+      ptr->AddRef();
+  }
+  SmartCOMPtr(const SmartCOMPtr<T>& sptr)
+  {
+    ptr = sptr.ptr;
+    if (ptr != NULL)
+      ptr->AddRef();
+  }
+  T** operator&() { return &ptr; }
+  T* operator->() { return ptr; }
+  T* operator=(T* p)
+  {
+    if (*this != p) {
+      ptr = p;
+      if (ptr != NULL)
+        ptr->AddRef();
+    }
+    return *this;
+  }
+  operator T*() const { return ptr; }
+  template <class I>
+  HRESULT QueryInterface(REFCLSID rclsid, I** pp)
+  {
+    if (pp != NULL) {
+      return ptr->QueryInterface(rclsid, (void**)pp);
+    } else {
+      return E_FAIL;
+    }
+  }
+  HRESULT CoCreateInstance(REFCLSID clsid, IUnknown* pUnknown,
+                           REFIID interfaceId, DWORD dwClsContext = CLSCTX_ALL)
+  {
+    HRESULT hr = ::CoCreateInstance(clsid, pUnknown, dwClsContext, interfaceId,
+                                    (void**)&ptr);
+    return hr;
+  }
+  ~SmartCOMPtr()
+  {
+    if (ptr != NULL)
+      ptr->Release();
+  }
+
+private:
+  T* ptr;
+};
+
+class SmartBSTR
+{
+public:
+  SmartBSTR() { str = NULL; }
+  SmartBSTR(const SmartBSTR& src)
+  {
+    if (src.str != NULL) {
+      str = ::SysAllocStringByteLen((char*)str, ::SysStringByteLen(str));
+    } else {
+      str = ::SysAllocStringByteLen(NULL, 0);
+    }
+  }
+  SmartBSTR& operator=(const SmartBSTR& src)
+  {
+    if (str != src.str) {
+      ::SysFreeString(str);
+      if (src.str != NULL) {
+        str = ::SysAllocStringByteLen((char*)str, ::SysStringByteLen(str));
+      } else {
+        str = ::SysAllocStringByteLen(NULL, 0);
+      }
+    }
+    return *this;
+  }
+  operator BSTR() const { return str; }
+  BSTR* operator&() throw() { return &str; }
+  ~SmartBSTR() throw() { ::SysFreeString(str); }
+private:
+  BSTR str;
+};
+
+struct VSInstanceInfo
+{
+  std::wstring InstanceId;
+  std::wstring VSInstallLocation;
+  std::wstring Version;
+  ULONGLONG ullVersion;
+  bool IsWin10SDKInstalled;
+  bool IsWin81SDKInstalled;
+
+  VSInstanceInfo()
+  {
+    InstanceId = VSInstallLocation = Version = L"";
+    ullVersion = 0;
+    IsWin10SDKInstalled = IsWin81SDKInstalled = false;
+  }
+};
+
+class cmVSSetupAPIHelper
+{
+public:
+  cmVSSetupAPIHelper();
+  ~cmVSSetupAPIHelper();
+
+  bool IsVS2017Installed();
+  bool GetVSInstanceInfo(std::string& vsInstallLocation);
+  bool IsWin10SDKInstalled();
+  bool IsWin81SDKInstalled();
+
+private:
+  bool Initialize();
+  bool GetVSInstanceInfo(SmartCOMPtr<ISetupInstance2> instance2,
+                         VSInstanceInfo& vsInstanceInfo);
+  bool CheckInstalledComponent(SmartCOMPtr<ISetupPackageReference> package,
+                               bool& bVCToolset, bool& bWin10SDK,
+                               bool& bWin81SDK);
+  int ChooseVSInstance(const std::vector<VSInstanceInfo>& vecVSInstances);
+  bool EnumerateAndChooseVSInstance();
+
+  // COM ptrs to query about VS instances
+  SmartCOMPtr<ISetupConfiguration> setupConfig;
+  SmartCOMPtr<ISetupConfiguration2> setupConfig2;
+  SmartCOMPtr<ISetupHelper> setupHelper;
+  // used to indicate failure in Initialize(), so we don't have to call again
+  bool initializationFailure;
+  // indicated if COM initialization is successful
+  HRESULT comInitialized;
+  // current best instance of VS selected
+  VSInstanceInfo chosenInstanceInfo;
+};
+
+#endif