Implement unsignedchar for vstudio

modules/vstudio/tests/vc2010/test_compile_settings.lua

@@ -1238,3 +1238,32 @@
 </ClCompile>
 		]]
 	end
+
+--
+-- Check UnsignedChar.
+--
+
+	function suite.unsignedChar_On()
+		unsignedchar "On"
+		prepare()
+		test.capture [[
+<ClCompile>
+	<PrecompiledHeader>NotUsing</PrecompiledHeader>
+	<WarningLevel>Level3</WarningLevel>
+	<Optimization>Disabled</Optimization>
+	<AdditionalOptions>/J %(AdditionalOptions)</AdditionalOptions>
+</ClCompile>
+		]]
+	end
+
+	function suite.unsignedChar_Off()
+		unsignedchar "Off"
+		prepare()
+		test.capture [[
+<ClCompile>
+	<PrecompiledHeader>NotUsing</PrecompiledHeader>
+	<WarningLevel>Level3</WarningLevel>
+	<Optimization>Disabled</Optimization>
+</ClCompile>
+		]]
+	end

modules/vstudio/vs2010_vcxproj.lua

@@ -1355,6 +1355,12 @@
 				table.insert(opts, "/std:c++latest")
 			end
 		end
+
+		if cfg.toolset and cfg.toolset:startswith("msc") then
+			local value = iif(cfg.unsignedchar, "On", "Off")
+			table.insert(opts, p.tools.msc.shared.unsignedchar[value])
+		end
+
 		if #opts > 0 then
 			opts = table.concat(opts, " ")
 			m.element("AdditionalOptions", condition, '%s %%(AdditionalOptions)', opts)