Fix issue CMake building for UWP

Author: ras0219-msft

Release/CMakeLists.txt

@@ -69,7 +69,7 @@ elseif(UNIX AND NOT APPLE) # Note: also android
   set(CPPREST_HTTP_CLIENT_IMPL asio CACHE STRING "Internal use.")
   set(CPPREST_HTTP_LISTENER_IMPL asio CACHE STRING "Internal use.")
 elseif(WINDOWS_PHONE OR WINDOWS_STORE)
-  set(CPPREST_PPLX_IMPL win CACHE STRING "Internal use.")
+  set(CPPREST_PPLX_IMPL winrt CACHE STRING "Internal use.")
   set(CPPREST_WEBSOCKETS_IMPL winrt CACHE STRING "Internal use.")
   set(CPPREST_FILEIO_IMPL winrt CACHE STRING "Internal use.")
   set(CPPREST_HTTP_CLIENT_IMPL winrt CACHE STRING "Internal use.")
@@ -115,7 +115,12 @@ elseif(ANDROID)
     )
 elseif(UNIX) # This includes OSX
 elseif(WIN32)
-  add_definitions(-DUNICODE -D_UNICODE -D_WIN32_WINNT=0x0600 -DWIN32 -D_SCL_SECURE_NO_WARNINGS)
+  add_definitions(-DUNICODE -D_UNICODE -DWIN32 -D_SCL_SECURE_NO_WARNINGS)
+  if(CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+    add_definitions(-D_WIN32_WINNT=0x0A00)
+  else()
+    add_definitions(-D_WIN32_WINNT=0x0600)
+  endif()
 
   if(NOT BUILD_SHARED_LIBS)
     # This causes cmake to not link the test libraries separately, but instead hold onto their object files.

Release/src/CMakeLists.txt

@@ -80,6 +80,11 @@ elseif(CPPREST_PPLX_IMPL STREQUAL "winpplx")
     pplx/threadpool.cpp
     pplx/pplxwin.cpp
   )
+elseif(CPPREST_PPLX_IMPL STREQUAL "winrt")
+  list(APPEND SOURCES
+    pplx/pplxwin.cpp
+  )
+  list(FILTER HEADERS_PPLX EXCLUDE REGEX "threadpool\\.h")
 endif()
 
 # Http client component
@@ -186,6 +191,7 @@ if(CPPREST_PPLX_IMPL STREQUAL "apple")
   target_link_libraries(cpprest PRIVATE ${COREFOUNDATION} ${SECURITY})
 elseif(CPPREST_PPLX_IMPL STREQUAL "linux")
 elseif(CPPREST_PPLX_IMPL STREQUAL "win")
+elseif(CPPREST_PPLX_IMPL STREQUAL "winrt")
 elseif(CPPREST_PPLX_IMPL STREQUAL "winpplx")
   target_compile_definitions(cpprest PUBLIC -DCPPREST_FORCE_PPLX=1)
 else()