Merge pull request #153 from super626/v3

Modify librecast platform tool set

Author: zilongshanren

recast/proj.win32/librecast.vcxproj

@@ -59,16 +59,19 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '12.0'">v120</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '12.0' and exists('$(MSBuildProgramFiles32)\Microsoft SDKs\Windows\v7.1A')">v120_xp</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '14.0'">v140</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '14.0' and exists('$(MSBuildProgramFiles32)\Microsoft SDKs\Windows\v7.1A')">v140_xp</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
-    <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
-    <WholeProgramOptimization>false</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '12.0'">v120</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '12.0' and exists('$(MSBuildProgramFiles32)\Microsoft SDKs\Windows\v7.1A')">v120_xp</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '14.0'">v140</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '14.0' and exists('$(MSBuildProgramFiles32)\Microsoft SDKs\Windows\v7.1A')">v140_xp</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">