fix building with system prebuilt libs

CMakeLists.txt

@@ -326,16 +326,23 @@ cocos_find_package(TIFF TIFF REQUIRED)
 cocos_find_package(WEBSOCKETS WEBSOCKETS REQUIRED)
 cocos_find_package(CURL CURL REQUIRED)
 
-add_subdirectory(external/flatbuffers)
-set(FLATBUFFERS_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/external)
-message(STATUS "Flatbuffers include dirs: ${FLATBUFFERS_INCLUDE_DIRS}")
-
-
-# build xxhash
-add_subdirectory(external/xxhash)
-set(XXHASH_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/external/xxhash)
-set(XXHASH_LIBRARIES xxhash)
+# flatbuffers
+if(USE_PREBUILT_LIBS)
+  add_subdirectory(external/flatbuffers)
+  set(FLATBUFFERS_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/external)
+  message(STATUS "Flatbuffers include dirs: ${FLATBUFFERS_INCLUDE_DIRS}")
+else()
+  cocos_find_package(flatbuffers flatbuffers REQUIRED)
+endif()
 
+# xxhash
+if(USE_PREBUILT_LIBS)
+  add_subdirectory(external/xxhash)
+  set(XXHASH_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/external/xxhash)
+  set(XXHASH_LIBRARIES xxhash)
+else()
+  cocos_find_package(xxhash xxhash REQUIRED)
+endif()
 # libcocos2d.a
 add_subdirectory(cocos)
 

cmake/Modules/FindRecast.cmake

@@ -0,0 +1,32 @@
+#.rst:
+# FindRecast
+# ------------
+#
+# Locate RECAST library
+#
+# This module defines
+#
+# ::
+#
+#   RECAST_LIBRARIES, the library to link against
+#   RECAST_FOUND, the libraries needed to use RECAST
+#   RECAST_INCLUDE_DIRS, where to find headers.
+#
+
+find_path(RECAST_INCLUDE_DIR
+	NAMES Recast/Recast.h
+	PATH_SUFFIXES include
+)
+
+find_library(RECAST_LIBRARY 
+	NAMES Recast
+	PATH_SUFFIXES lib
+)
+
+set(RECAST_INCLUDE_DIRS "${RECAST_INCLUDE_DIR}")
+set(RECAST_LIBRARIES "${RECAST_LIBRARY}")
+
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+find_package_handle_standard_args(RECAST DEFAULT_MSG RECAST_LIBRARIES RECAST_INCLUDE_DIRS)
+
+mark_as_advanced(RECAST_INCLUDE_DIR RECAST_LIBRARY)

cmake/Modules/Findflatbuffers.cmake

@@ -0,0 +1,32 @@
+#.rst:
+# Findflatbuffers
+# ------------
+#
+# Locate flatbuffers library
+#
+# This module defines
+#
+# ::
+#
+#   FLATBUFFERS_LIBRARIES, the library to link against
+#   FLATBUFFERS_FOUND, the libraries needed to use flatbuffers
+#   FLATBUFFERS_INCLUDE_DIRS, where to find headers.
+#
+
+find_path(FLATBUFFERS_INCLUDE_DIR
+	NAMES flatbuffers.h
+	PATH_SUFFIXES include include/flatbuffers
+)
+
+find_library(FLATBUFFERS_LIBRARY 
+	NAMES flatbuffers
+	PATH_SUFFIXES lib
+)
+
+set(FLATBUFFERS_INCLUDE_DIRS "${FLATBUFFERS_INCLUDE_DIR}")
+set(FLATBUFFERS_LIBRARIES "${FLATBUFFERS_LIBRARY}")
+
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+find_package_handle_standard_args(FLATBUFFERS DEFAULT_MSG FLATBUFFERS_LIBRARIES FLATBUFFERS_INCLUDE_DIRS)
+
+mark_as_advanced(FLATBUFFERS_INCLUDE_DIR FLATBUFFERS_LIBRARY)

cmake/Modules/Findxxhash.cmake

@@ -0,0 +1,32 @@
+#.rst:
+# Findxxhash
+# ------------
+#
+# Locate xxhash library
+#
+# This module defines
+#
+# ::
+#
+#   XXHASH_LIBRARIES, the library to link against
+#   XXHASH_FOUND, the libraries needed to use flatbuffers
+#   XXHASH_INCLUDE_DIRS, where to find headers.
+#
+
+find_path(XXHASH_INCLUDE_DIR
+	NAMES xxhash.h xxhash.h
+	PATH_SUFFIXES include include/xxhash
+)
+
+find_library(XXHASH_LIBRARY 
+	NAMES xxhash
+	PATH_SUFFIXES lib
+)
+
+set(XXHASH_INCLUDE_DIRS "${XXHASH_INCLUDE_DIR}")
+set(XXHASH_LIBRARIES "${XXHASH_LIBRARY}")
+
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+find_package_handle_standard_args(XXHASH DEFAULT_MSG XXHASH_LIBRARIES XXHASH_INCLUDE_DIRS)
+
+mark_as_advanced(XXHASH_INCLUDE_DIR XXHASH_LIBRARY)