remove leaf and use leaf from system wide

.gitmodules

@@ -14,6 +14,3 @@
 	path = flex/third_party/nlohmann-json
 	url = https://github.com/nlohmann/json.git
 
-[submodule "flex/third_party/leaf"]
-	path = flex/third_party/leaf
-	url = https://github.com/boostorg/leaf.git

flex/CMakeLists.txt

@@ -192,13 +192,6 @@ if (NOT EXISTS ${CMAKE_SOURCE_DIR}/third_party/nlohmann-json/single_include/nloh
 endif()
 include_directories(SYSTEM ${CMAKE_SOURCE_DIR}/third_party/nlohmann-json/single_include)
 
-# Check whether ${CMAKE_SOURCE_DIR}/third_party/leaf/include/leaf.hpp exists
-if (NOT EXISTS ${CMAKE_SOURCE_DIR}/third_party/leaf/include/boost/leaf.hpp)
-    message(FATAL_ERROR "${CMAKE_SOURCE_DIR}/third_party/leaf/include/boost/leaf.hpp not found, "
-                         "please run `git submodule update --init` to download third_party")
-endif()
-include_directories(SYSTEM ${CMAKE_SOURCE_DIR}/third_party/leaf/include)
-
 if (BUILD_ODPS_FRAGMENT_LOADER)
     include_directories(SYSTEM ${CMAKE_SOURCE_DIR}/third_party/odps/include)
 endif()

flex/engines/graph_db/runtime/CMakeLists.txt

@@ -6,6 +6,7 @@ install_flex_target(runtime_common)
 file(GLOB_RECURSE ADHOC_SOURCES "adhoc/*.cc")
 add_library(runtime_adhoc SHARED ${ADHOC_SOURCES})
 target_link_libraries(runtime_adhoc runtime_common)
+target_link_libraries(runtime_adhoc Boost::headers)
 install_flex_target(runtime_adhoc)
 
 

flex/engines/graph_db/runtime/common/leaf_utils.h

@@ -16,7 +16,7 @@
 #ifndef RUNTIME_COMMON_LEAF_UTILS_H_
 #define RUNTIME_COMMON_LEAF_UTILS_H_
 
-#include "boost/leaf.hpp"
+#include <boost/leaf.hpp>
 #include "flex/utils/result.h"
 
 namespace bl = boost::leaf;
@@ -33,4 +33,4 @@ namespace bl = boost::leaf;
   return ::boost::leaf::new_error(        \
       ::gs::Status(::gs::StatusCode::UNIMPLEMENTED, msg))
 
-#endif  // RUNTIME_COMMON_LEAF_UTILS_H_
+#endif  // RUNTIME_COMMON_LEAF_UTILS_H_