Add NO_WCHAR_T build option to CMake (#384)

CMakeLists.txt

@@ -37,6 +37,8 @@ option(ENABLE_CODE_ANALYSIS "Use Static Code Analysis on build" OFF)
 
 option(USE_PREBUILT_SHADERS "Use externally built HLSL shaders" OFF)
 
+option(NO_WCHAR_T "Use legacy wide-character as unsigned short" OFF)
+
 # Includes the functions for loading/saving OpenEXR files at runtime
 option(ENABLE_OPENEXR_SUPPORT "Build with OpenEXR support" OFF)
 
@@ -399,6 +401,13 @@ if(MSVC)
         target_link_options(${t} PRIVATE "$<$<NOT:$<CONFIG:DEBUG>>:/guard:ehcont>")
       endforeach()
     endif()
+
+    if(NO_WCHAR_T)
+      message(STATUS "Using non-native wchar_t as unsigned short")
+      foreach(t IN LISTS TOOL_EXES ITEMS ${PROJECT_NAME})
+        target_compile_options(${t} PRIVATE "/Zc:wchar_t-")
+      endforeach()
+    endif()
 else()
     foreach(t IN LISTS TOOL_EXES ITEMS ${PROJECT_NAME})
       target_compile_definitions(${t} PRIVATE $<IF:$<CONFIG:DEBUG>,_DEBUG,NDEBUG>)