cache dgc package (#23941)

cmake/external/dgc.cmake

@@ -14,17 +14,24 @@
 
 INCLUDE(ExternalProject)
 
-SET(DGC_SOURCES_DIR "${THIRD_PARTY_PATH}/dgc")
+SET(DGC_PREFIX_DIR  "${THIRD_PARTY_PATH}/dgc")
+SET(DGC_SOURCES_DIR "${THIRD_PARTY_PATH}/dgc/src/extern_dgc")
 SET(DGC_INSTALL_DIR "${THIRD_PARTY_PATH}/install/dgc")
 SET(DGC_INCLUDE_DIR "${DGC_INSTALL_DIR}/include" CACHE PATH "dgc include directory." FORCE)
 SET(DGC_LIBRARIES   "${DGC_INSTALL_DIR}/lib/libdgc.a" CACHE FILEPATH "dgc library." FORCE)
+SET(DGC_URL         "http://fleet.bj.bcebos.com/collective_ef2216a.tgz")
 INCLUDE_DIRECTORIES(${DGC_INCLUDE_DIR})
 
+cache_third_party(extern_dgc
+        URL       ${DGC_URL}
+        DIR       DGC_SOURCES_DIR)
+
 ExternalProject_Add(
     extern_dgc
     ${EXTERNAL_PROJECT_LOG_ARGS}
-    URL             "http://fleet.bj.bcebos.com/collective_ef2216a.tgz"
+    "${DGC_DOWNLOAD_CMD}"
     URL_MD5         "2f67549fd5f1262383d83289abc4f88f"
+    PREFIX          "${DGC_PREFIX_DIR}"
     SOURCE_DIR      "${DGC_SOURCES_DIR}"
     CONFIGURE_COMMAND ""
     BUILD_COMMAND make -j $(nproc)