Incorporate C++ Buffer management and Seal global threadpool fix from arrow (#1950)

src/common/cmake/Common.cmake

@@ -10,7 +10,12 @@ if(UNIX AND NOT APPLE)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -rdynamic")
 endif()
 
-set(FLATBUFFERS_VERSION "1.7.1")
+# The following is needed because in CentOS, the lib directory is named lib64
+if(EXISTS "/etc/redhat-release" AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(LIB_SUFFIX 64)
+endif()
+
+set(FLATBUFFERS_VERSION "1.9.0")
 
 set(FLATBUFFERS_PREFIX "${CMAKE_BINARY_DIR}/flatbuffers_ep-prefix/src/flatbuffers_ep-install")
 if (NOT TARGET flatbuffers_ep)
@@ -19,13 +24,14 @@ if (NOT TARGET flatbuffers_ep)
     CMAKE_ARGS
       "-DCMAKE_CXX_FLAGS=-fPIC"
       "-DCMAKE_INSTALL_PREFIX:PATH=${FLATBUFFERS_PREFIX}"
-      "-DFLATBUFFERS_BUILD_TESTS=OFF")
+      "-DFLATBUFFERS_BUILD_TESTS=OFF"
+      "-DCMAKE_BUILD_TYPE=RELEASE")
 endif()
 
 set(FBS_DEPENDS flatbuffers_ep)
 
 set(FLATBUFFERS_INCLUDE_DIR "${FLATBUFFERS_PREFIX}/include")
-set(FLATBUFFERS_STATIC_LIB "${FLATBUFFERS_PREFIX}/lib/libflatbuffers.a")
+set(FLATBUFFERS_STATIC_LIB "${FLATBUFFERS_PREFIX}/lib${LIB_SUFFIX}/libflatbuffers.a")
 set(FLATBUFFERS_COMPILER "${FLATBUFFERS_PREFIX}/bin/flatc")
 
 message(STATUS "Flatbuffers include dir: ${FLATBUFFERS_INCLUDE_DIR}")