Force XP toolchain in newer Visual Studio

CMakeLists.txt

@@ -21,6 +21,12 @@
 #
 
 cmake_minimum_required(VERSION 2.6.0)
+
+# Install custom module path
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/")
+
+include(VSForceXPToolchain) # Force XP toolchain for Visual Studio
+
 project (HLSDK-XASH3D)
 
 #--------------

cmake/VSForceXPToolchain.cmake

@@ -0,0 +1,29 @@
+if(WIN32)
+	# Windows XP compatible platform toolset. Must be set before project(),
+	# otherwise change of CMAKE_*_TOOLSET will take no effect.
+	# We get VS version from the generator name because neither MSVC* nor other
+	# variables that describe the compiler aren't available before project().
+	if ("${CMAKE_GENERATOR}" MATCHES "Visual Studio ([0-9]+)")
+		if(${CMAKE_MATCH_1} LESS 11)
+			# Nothing. Older VS does support XP by default.
+		elseif(${CMAKE_MATCH_1} EQUAL 11)
+			# Visual Studio 11 2012
+			set(CMAKE_GENERATOR_TOOLSET "v110_xp" CACHE STRING "CMAKE_GENERATOR_TOOLSET" FORCE)
+			set(CMAK_VS_PLATFORM_TOOLSET "v110_xp" CACHE STRING "CMAKE_VS_PLATFORM_TOOLSET" FORCE)
+		elseif (${CMAKE_MATCH_1} EQUAL 12)
+			# Visual Studio 12 2013
+			set(CMAKE_GENERATOR_TOOLSET "v120_xp" CACHE STRING "CMAKE_GENERATOR_TOOLSET" FORCE)
+			set(CMAKE_VS_PLATFORM_TOOLSET "v120_xp" CACHE STRING "CMAKE_VS_PLATFORM_TOOLSET" FORCE)
+		elseif (${CMAKE_MATCH_1} EQUAL 14)
+			# Visual Studio 14 2015
+			set(CMAKE_GENERATOR_TOOLSET "v140_xp" CACHE STRING "CMAKE_GENERATOR_TOOLSET" FORCE)
+			set(CMAKE_VS_PLATFORM_TOOLSET "v140_xp" CACHE STRING "CMAKE_VS_PLATFORM_TOOLSET" FORCE)
+		elseif (${CMAKE_MATCH_1} EQUAL 15)
+			# Visual Studio 15 2017
+			set(CMAKE_GENERATOR_TOOLSET "v141_xp" CACHE STRING "CMAKE_GENERATOR_TOOLSET" FORCE)
+			set(CMAKE_VS_PLATFORM_TOOLSET "v141_xp" CACHE STRING "CMAKE_VS_PLATFORM_TOOLSET" FORCE)
+		else()
+			message(WARNING "WARNING: You maybe building without Windows XP compability. See which toolchain version Visual Studio provides, and say cmake to use it: cmake -G \"Visual Studio XX\" -T \"vXXX_xp\"")
+		endif()
+	endif()
+endif()