Merge branch 'develop' into develop

CMakeLists.txt

 cmake_minimum_required(VERSION 3.6)
 
 option(USE_OPENMP "openmp support" ON)
-option(DEBUGING "enable debug mode" ON)
+option(DEBUGING "enable debug mode" OFF)
 option(USE_EXCEPTION "use std exception" ON)
+option(SYMBOL_HIDDEN "symbol hidden" OFF) # on when use jni or ios io
 option(LOG_PROFILE "log profile" OFF)
 # select the platform to build
 option(CPU "armv7 with neon" ON)
@@ -10,6 +11,7 @@ option(GPU_MALI "mali gpu" OFF)
 option(GPU_CL "opencl gpu" ON)
 option(FPGA "fpga" OFF)
 
+
 project(paddle-mobile)
 
 file(GLOB_RECURSE PADDLE_MOBILE_CC src/*.cc src/*.cpp src/*.c src/*.mm)
@@ -30,10 +32,10 @@ if(DEBUGING)
     message(STATUS "debugging mode")
     add_definitions(-DPADDLE_MOBILE_DEBUG)
 else()
-    if(FPGA)
-    else()
-        add_definitions(-fvisibility=hidden -fvisibility-inlines-hidden)
-    endif()
+endif()
+
+if(SYMBOL_HIDDEN)
+    add_definitions(-fvisibility=hidden -fvisibility-inlines-hidden)
 endif()
 
 if(USE_EXCEPTION)