<Target Name="Remove _utest.cpp" BeforeTargets="ClCompile" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
  <ItemGroup>
    <ClCompile Remove="*_utest.cpp" />
  </ItemGroup>
</Target>

<ItemDefinitionGroup Condition="'%(Identity)'=='throttle_utest.cpp'">
    <ClCompile Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
        <ExcludedFromBuild>true</ExcludedFromBuild>
    </ClCompile>
</ItemDefinitionGroup>

<ItemDefinitionGroup Condition="$([System.Text.RegularExpressions.Regex]::IsMatch(%(Identity), '_utest.cpp$'))">
    <ClCompile Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
        <ExcludedFromBuild>true</ExcludedFromBuild>
    </ClCompile>
</ItemDefinitionGroup>

<ClCompile Include="foo_utest.cpp">
 <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</ExcludedFromBuild>
 <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
 <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
 <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
</ClCompile>