diff --git a/build_tools/build_iOS.sh b/build_tools/build_iOS.sh
index 9c868bcf2..da1884cab 100755
--- a/build_tools/build_iOS.sh
+++ b/build_tools/build_iOS.sh
@@ -61,7 +61,7 @@ function create_cmake_config(){
 }
 #build to ffmpeg
 function build_shared_framework(){
-    if [ -z "${LIB_NAME}" ];then
+    if [[ -z "${LIB_NAME}" ]];then
         export LIB_NAME=ffmpeg
     fi
     SRC_LIBRARIES="$(cd ./install/ffmpeg/iOS/fat/lib; ls)"
@@ -84,7 +84,7 @@ function build_shared_framework(){
         fi
     done
 
-    if [ -d "${DAV1D_EXTERNAL_DIR}/iOS/fat" ];then
+    if [[ -d "${DAV1D_EXTERNAL_DIR}/iOS/fat" ]];then
         SRC_LIBRARIES_DIR="$SRC_LIBRARIES_DIR ${DAV1D_EXTERNAL_DIR}/iOS/fat/lib"
         SRC_LIBRARIES="$SRC_LIBRARIES dav1d"
     fi
@@ -98,7 +98,8 @@ function build_shared_framework(){
 
     create_cmake_config
 
-    touch dummy.c
+    cp ${BUILD_TOOLS_DIR}/src/build_version.cpp ./
+    sh ${BUILD_TOOLS_DIR}/gen_build_version.sh > version.h
     rm -rf Xcode/
     mkdir -p Xcode/OS
     cd Xcode/OS
diff --git a/build_tools/build_native.sh b/build_tools/build_native.sh
index cac5d1c7f..e2ef18777 100755
--- a/build_tools/build_native.sh
+++ b/build_tools/build_native.sh
@@ -66,7 +66,8 @@ function build_shared_framework(){
 
     create_cmake_config
 
-    touch dummy.c
+    cp ${BUILD_TOOLS_DIR}/src/build_version.cpp ./
+    sh ${BUILD_TOOLS_DIR}/gen_build_version.sh > version.h
     rm -rf Xcode/
     mkdir -p Xcode
     cd Xcode
diff --git a/build_tools/common_build.sh b/build_tools/common_build.sh
index 0c32d15e1..ab3e73ebe 100644
--- a/build_tools/common_build.sh
+++ b/build_tools/common_build.sh
@@ -214,8 +214,14 @@ function link_shared_lib_Android(){
         ldflags="$ldflags -lx264 -L${X264_INSTALL_DIR}/lib/"
     fi
 
-    ${CROSS_COMPILE}-gcc -lm -lz -shared --sysroot=${SYSTEM_ROOT}  -Wl,--no-undefined -Wl,-z,noexecstack ${CPU_LD_FLAGS}  -landroid -llog -Wl,-soname,lib${LIB_NAME}.so \
+    cp ${BUILD_TOOLS_DIR}/src/build_version.cpp ./
+    sh ${BUILD_TOOLS_DIR}/gen_build_version.sh > version.h
+
+    ${CROSS_COMPILE}-gcc build_version.cpp -lm -lz -shared --sysroot=${SYSTEM_ROOT} \
+     -Wl,--no-undefined -Wl,-z,noexecstack ${CPU_LD_FLAGS}  -landroid -llog -Wl,-soname,lib${LIB_NAME}.so \
     ${objs} \
     -o ${install_dir}/lib${LIB_NAME}.so \
     -Wl,--whole-archive   ${ldflags} -Wl,--no-whole-archive
+
+    rm build_version.cpp version.h
 }
diff --git a/build_tools/gen_build_version.sh b/build_tools/gen_build_version.sh
new file mode 100755
index 000000000..94e03eba7
--- /dev/null
+++ b/build_tools/gen_build_version.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+git_v=$(git describe  --always)
+time_v=$(date "+%Y%m%d_%H:%M:%S")
+
+out="#define build_version \"${time_v}_${git_v}\""
+echo "$out"
diff --git a/build_tools/iOS/CMakeLists.txt b/build_tools/iOS/CMakeLists.txt
index 2f46daaf8..c60bb0c8b 100644
--- a/build_tools/iOS/CMakeLists.txt
+++ b/build_tools/iOS/CMakeLists.txt
@@ -17,7 +17,7 @@ set(LIBRARYS ${SRC_LIBRARIES})
 
 link_directories(${SRC_LIBRARIES_DIR})
 add_library(${LIB_NAME} SHARED
-        dummy.c
+        build_version.cpp
         )
 if (IOS)
 set_target_properties(${LIB_NAME} PROPERTIES
diff --git a/build_tools/src/build_version.cpp b/build_tools/src/build_version.cpp
new file mode 100644
index 000000000..0f7f4eb31
--- /dev/null
+++ b/build_tools/src/build_version.cpp
@@ -0,0 +1,23 @@
+//
+// Created by moqi on 2020/3/20.
+//
+#include <stdio.h>
+#include "version.h"
+#ifdef __ANDROID__
+    #include <android/log.h>
+#endif
+
+static const char *get_external_build_version();
+
+static const char *v = get_external_build_version();
+
+static const char *get_external_build_version()
+{
+#ifdef __ANDROID__
+    __android_log_print(ANDROID_LOG_VERBOSE, "version", "external version is %s\n", build_version);
+#else
+    printf("external version is %s\n", build_version);
+#endif
+    return build_version;
+}
+