add xxhash on linux

CMakeLists.txt

@@ -161,6 +161,7 @@ include_directories(
   ${CMAKE_CURRENT_SOURCE_DIR}/external/glfw3/include/${PLATFORM_FOLDER}
   ${CMAKE_CURRENT_SOURCE_DIR}/external/freetype2/include/${PLATFORM_FOLDER}
   ${CMAKE_CURRENT_SOURCE_DIR}/external/websockets/include/${PLATFORM_FOLDER}
+  ${CMAKE_CURRENT_SOURCE_DIR}/external/xxhash
 )
 
 if(WIN32)
@@ -231,6 +232,9 @@ add_subdirectory(external/unzip)
 # tinyxml2 library
 add_subdirectory(external/tinyxml2)
 
+# xxhas library
+add_subdirectory(external/xxhash)
+
 # audio
 add_subdirectory(cocos/audio)
 

external/xxhash/CMakeLists.txt

@@ -0,0 +1,14 @@
+set(XXHASH
+  xxhash.c
+)
+
+add_library(xxhash STATIC
+  ${XXHASH}
+)
+
+set_target_properties(xxhash
+    PROPERTIES
+    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
+)
+