Enabled check for CUB and conditional build for OpenCV.

DataReader/ImageReader/ImageReader.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" InitialTargets="CheckDependencies" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|x64">
       <Configuration>Debug</Configuration>
@@ -29,6 +29,18 @@
     <PlatformToolset>v120</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <Choose>
+    <When Condition="Exists('$(OPENCV_PATH)')">
+      <PropertyGroup>
+        <HasOpenCV>true</HasOpenCV>
+      </PropertyGroup>
+    </When>
+    <Otherwise>
+      <PropertyGroup>
+        <HasOpenCV>false</HasOpenCV>
+      </PropertyGroup>
+    </Otherwise>
+  </Choose>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <UseDebugLibraries>true</UseDebugLibraries>
   </PropertyGroup>
@@ -42,9 +54,10 @@
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup>
-    <IncludePath>..\..\common\include;..\..\math\math;$(OPENCV_DIR)\include;$(IncludePath);</IncludePath>
-    <LibraryPath>$(SolutionDir)$(Platform)\$(Configuration);$(OPENCV_DIR)\x64\vc12\lib;$(LibraryPath);</LibraryPath>
+    <IncludePath>..\..\common\include;..\..\math\math;$(OPENCV_PATH)\include;$(IncludePath);</IncludePath>
+    <LibraryPath>$(SolutionDir)$(Platform)\$(Configuration);$(OPENCV_PATH)\x64\vc12\lib;$(LibraryPath);</LibraryPath>
     <IntDir>$(Platform)\$(Configuration)\$(ProjectName)\</IntDir>
+    <OpenCVLib Condition="$(HasOpenCV)">opencv_world300.lib</OpenCVLib>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <LinkIncremental>true</LinkIncremental>
@@ -64,10 +77,10 @@
     <Link>
       <SubSystem>Windows</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
-      <AdditionalDependencies>CNTKMath.lib;opencv_world300.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>CNTKMath.lib;$(OpenCVLib);%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
     <PostBuildEvent>
-      <Command>xcopy /Y $(OPENCV_DIR)\x64\vc12\bin\opencv_world300.dll $(TargetDir)</Command>
+      <Command Condition="$(HasOpenCV)">xcopy /Y $(OPENCV_PATH)\x64\vc12\bin\opencv_world300.dll $(TargetDir)</Command>
     </PostBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
@@ -111,8 +124,12 @@
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
     </ClCompile>
     <ClCompile Include="dllmain.cpp" />
-    <ClCompile Include="Exports.cpp" />
-    <ClCompile Include="ImageReader.cpp" />
+    <ClCompile Include="Exports.cpp">
+      <ExcludedFromBuild Condition="!$(HasOpenCV)">true</ExcludedFromBuild>
+    </ClCompile>
+    <ClCompile Include="ImageReader.cpp">
+      <ExcludedFromBuild Condition="!$(HasOpenCV)">true</ExcludedFromBuild>
+    </ClCompile>
     <ClCompile Include="stdafx.cpp">
       <PrecompiledHeader>Create</PrecompiledHeader>
     </ClCompile>
@@ -120,4 +137,8 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
+  <Target Name="CheckDependencies">
+    <Warning Condition="!$(HasOpenCV)"
+      Text="ImageReader requires OpenCV library v3.0 or higher to build. Please install the library from http://opencv.org/downloads.html and set OPENCV_PATH environment variable to OpenCV build folder (e.g. C:\src\opencv\build)." />
+  </Target>
 </Project>

Math/Math/CNTKMathCUDA.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" InitialTargets="CheckDependencies" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|x64">
       <Configuration>Debug</Configuration>
@@ -187,4 +187,8 @@
   <ImportGroup Label="ExtensionTargets">
     <Import Project="$(VCTargetsPath)\BuildCustomizations\CUDA 7.0.targets" />
   </ImportGroup>
+  <Target Name="CheckDependencies">
+    <Error Condition="!Exists('$(CUB_PATH)')"
+      Text="CNTK requires NVIDIA CUB library v1.4.1 to build. Please download the library from https://nvlabs.github.io/cub/ and set CUB_PATH environment variable to CUB root path (e.g. c:\src\cub-1.4.1)." />
+  </Target>
 </Project>