update libpd cmake for xcode 10

Dependencies/LibPdBuild/CMakeLists.txt

@@ -8,9 +8,24 @@ project(libpd C)
 #------------------------------------------------------------------------------#
 # CMAKE MAC OS SPECIFIC
 #------------------------------------------------------------------------------#
+
+if(CMAKE_GENERATOR STREQUAL Xcode)
+	if(XCODE_VERSION VERSION_LESS "10.0")
+		set(XCODE_32BIT_LIMITATION OFF)
+	else()
+		set(XCODE_32BIT_LIMITATION ON)
+		message("32 bit limitation")
+	endif()
+endif()
+
 set(CMAKE_OSX_DEPLOYMENT_TARGET 10.7)
 set(CMAKE_MACOSX_RPATH ON)
-set(CMAKE_OSX_ARCHITECTURES "i386;x86_64")
+
+if(XCODE_32BIT_LIMITATION)
+	set(CMAKE_OSX_ARCHITECTURES "i386;x86_64")
+else()
+	set(CMAKE_OSX_ARCHITECTURES "x86_64")
+endif()
 
 set(LIBPD_PATH "${PROJECT_SOURCE_DIR}/../LibPd")
 set(LIBPD_OUTPUT_DIRECTORY "./..")
@@ -314,15 +329,18 @@ endif()
 #------------------------------------------------------------------------------#
 set(THREADS_PREFER_PTHREAD_FLAG On)
 set(CMAKE_THREAD_PREFER_PTHREAD True)
-find_package(Threads REQUIRED)
+if(NOT XCODE_32BIT_LIMITATION)
+	find_package(Threads REQUIRED)
 
-if(LIBPD_INCLUDE_DYNAMIC_LIBRARY)
-  target_link_libraries(libpdshared Threads::Threads)
-endif()
-if(LIBPD_INCLUDE_STATIC_LIBRARY)
-  target_link_libraries(libpdstatic Threads::Threads)
+	if(LIBPD_INCLUDE_DYNAMIC_LIBRARY)
+	  target_link_libraries(libpdshared Threads::Threads)
+	endif()
+	if(LIBPD_INCLUDE_STATIC_LIBRARY)
+	  target_link_libraries(libpdstatic Threads::Threads)
+	endif()
 endif()
 
+
 if(MSVC)
     link_directories(${PROJECT_SOURCE_DIR}/pure-data)
     if(LIBPD_INCLUDE_DYNAMIC_LIBRARY)