diff --git a/Readme.md b/Readme.md
index 5b654a957d363b2627b9000c7162dcf07e33eb0d..d96821acd641e7748286b2a8ab248f37cf50cdbc 100644
--- a/Readme.md
+++ b/Readme.md
@@ -43,9 +43,14 @@ Open the front end, back end, and compilation optimization of compilers. Support
 - make libcore
 - make testall
 
+C example:
+- make demo
+
 ## OpenArkCompiler Incubator
 - FutureWei Mapleall https://gitee.com/openarkcompiler-incubator/mapleall
 - Maple Engine https://gitee.com/openarkcompiler-incubator/maple_engine
+- Maple FrondEnd https://gitee.com/openarkcompiler-incubator/MapleFE
+- Maple clang2mpl https://gitee.com/openarkcompiler-incubator/clang2mpl
 
 ## Related Documents
 
diff --git a/build/envsetup.sh b/build/envsetup.sh
index 8c72c48dedce128e5e33df2b4def6458993a1003..34945e340c67b75f5c1f8f305219d663b3fce756 100644
--- a/build/envsetup.sh
+++ b/build/envsetup.sh
@@ -92,6 +92,10 @@ export MAPLE_EXECUTE_BIN=${MAPLE_ROOT}/output/${MAPLE_BUILD_TYPE}/bin
 export TEST_BIN=${CASE_ROOT}/driver/script
 export PATH=$PATH:${MAPLE_EXECUTE_BIN}:${TEST_BIN}
 
+if [ "$OLD_OS" = "1" ]; then
+  export LD_LIBRARY_PATH=${MAPLE_ROOT}/tools/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04/lib:$LD_LIBRARY_PATH
+fi
+
 if [ ! -f $MAPLE_ROOT/tools/qemu/package/usr/bin/qemu-aarch64 ] && [ "$OLD_OS" = "0" ]; then
   echo " "
   echo "!!! please run \"make setup\" to get proper qemu-aarch64"
diff --git a/test/c_demo/README.md b/test/c_demo/README.md
index 4158f26cc23a3acfee201a836715d07057db6727..3405632c66e760c1b6a97afe692c58a62d48c92f 100644
--- a/test/c_demo/README.md
+++ b/test/c_demo/README.md
@@ -21,10 +21,10 @@
 example of Maple Compiler for C Language
 
 Besides maple compiler, included are processes using C front end tools:
-  1. whirl2mpl - Front end using Open64 Whirl IR.
-     source code is available at https://gitee.com/open64ark/open64ark
+  1. clang2mpl - Front end using clang AST
+     source code is available at https://gitee.com/openarkcompiler-incubator/clang2mpl
 
 #### 使用说明
   run the following scripts for details
 
-  ../maple_aarch64_with_whirl2mpl.sh . printHuawei 1 1
+  ../maple_aarch64_with_clang2mpl.sh . printHuawei 1 1
diff --git a/testsuite/driver/src/api/clang2mpl.py b/testsuite/driver/src/api/clang2mpl.py
index dee77c273b4a7d70d836987637d9a805790502ec..5299461379750931a8c3354390aef013e1dcdb06 100644
--- a/testsuite/driver/src/api/clang2mpl.py
+++ b/testsuite/driver/src/api/clang2mpl.py
@@ -22,8 +22,6 @@ class Clang2mpl(ShellOperator):
         self.infile = infile
 
     def get_command(self, variables):
-        linaroDir = "${MAPLE_ROOT}/tools/gcc-linaro-7.5.0"
-        isystemFlags = "-isystem " + linaroDir + "/aarch64-linux-gnu/libc/usr/include -isystem " + linaroDir + "/lib/gcc/aarch64-linux-gnu/7.5.0/include"
-        clangFlags = "--target=aarch64-linux-elf -Wno-return-type -U__SIZEOF_INT128__ " + isystemFlags
+        clangFlags = "--target=aarch64-linux-elf -Wno-return-type -U__SIZEOF_INT128__ "
         self.command = "${MAPLE_EXECUTE_BIN}/clang2mpl --ascii " + self.infile + " -- " + clangFlags
         return super().get_final_command(variables)
diff --git a/testsuite/driver/src/mode/CO0.py b/testsuite/driver/src/mode/CO0.py
index ce77a51a0a39f64a1c75966927695edc77bd2939..b23f87e9ad9cfb171216e15f99ba14b5a07c21c7 100644
--- a/testsuite/driver/src/mode/CO0.py
+++ b/testsuite/driver/src/mode/CO0.py
@@ -40,7 +40,7 @@ CO0 = {
     ],
     "run": [
         Shell(
-            "${TOOL_BIN_PATH}/qemu-aarch64 -L /usr/aarch64-linux-gnu/ ${APP}.out"
+            "${TOOL_BIN_PATH}/qemu-aarch64 -L ${MAPLE_ROOT}/tools/gcc-linaro-7.5.0/aarch64-linux-gnu/libc/ ${APP}.out"
         )
     ]
 }
diff --git a/testsuite/driver/src/mode/CO2.py b/testsuite/driver/src/mode/CO2.py
index 1336993828f930f51ca0858cd70106c1944ee762..b191ba1d1b92f2e3aee15f8083ae0df4846a92ad 100644
--- a/testsuite/driver/src/mode/CO2.py
+++ b/testsuite/driver/src/mode/CO2.py
@@ -40,7 +40,7 @@ CO2 = {
     ],
     "run": [
         Shell(
-            "${TOOL_BIN_PATH}/qemu-aarch64 -L /usr/aarch64-linux-gnu/ ${APP}.out"
+            "${TOOL_BIN_PATH}/qemu-aarch64 -L ${MAPLE_ROOT}/tools/gcc-linaro-7.5.0/aarch64-linux-gnu/libc/ ${APP}.out"
         )
     ]
 }
diff --git a/tools/setup_tools.sh b/tools/setup_tools.sh
index d72a7d8cab0b14ebdd1a12e71f1d652718817f18..7516812573e6c99eff89a42d36db3c068fcbbc02 100755
--- a/tools/setup_tools.sh
+++ b/tools/setup_tools.sh
@@ -91,6 +91,16 @@ if [ ! -f $TOOLS/gcc-linaro-7.5.0/bin/aarch64-linux-gnu-gcc ]; then
   echo Downloaded gcc aarch64 compiler.
 fi
 
+if [ ! -d $TOOLS/sysroot-glibc-linaro-2.25 ]; then
+  cd $TOOLS
+  echo Start wget sysroot-glibc-linaro-2.25 ...
+  wget https://releases.linaro.org/components/toolchain/binaries/latest-7/aarch64-linux-gnu/sysroot-glibc-linaro-2.25-2019.12-aarch64-linux-gnu.tar.xz
+  echo unpacking sysroot ...
+  tar xf sysroot-glibc-linaro-2.25-2019.12-aarch64-linux-gnu.tar.xz
+  mv sysroot-glibc-linaro-2.25-2019.12-aarch64-linux-gnu sysroot-glibc-linaro-2.25
+  echo Downloaded aarch64 sysroot.
+fi
+
 if [ ! -f $MAPLE_ROOT/third_party/d8/lib/d8.jar ]; then
   cd $TOOLS
   echo Start clone d8 ...
@@ -143,27 +153,10 @@ if [ ! -f $TOOLS/qemu/package/usr/bin/qemu-aarch64 ]; then
   echo Installed qemu-aarch64
 fi
 
-version=c3b1120
-if [ ! -f $TOOLS/open64_prebuilt/V_$version ]; then
-  cd $TOOLS
-  rm -rf open64_prebuilt
-  git clone --depth 1 https://gitee.com/open64ark/open64_prebuilt.git
-fi
-if [ ! -f $TOOLS/open64_prebuilt/x86/riscv64/bin/clangfe ]; then
-  cd $TOOLS/open64_prebuilt/x86
-  git fetch origin
-  git checkout $version
-  tar zxf open64ark-aarch64.tar.gz
-  tar zxf open64ark-riscv.tar.gz
-  mv riscv riscv64
-  touch $TOOLS/open64_prebuilt/V_$version
-  echo Downloaded open64_prebuilt.
-fi
-
 # clang2mpl
 if [ ! -d $TOOLS/clang2mpl ]; then
+  cd $TOOLS
   git clone --depth 1 https://gitee.com/openarkcompiler-incubator/clang2mpl.git
-  echo Installed qemu-aarch64
 fi
 # routinly updated to be compatible with maple
 cd $TOOLS/clang2mpl
@@ -178,15 +171,13 @@ if [ "$OLD_OS" == "1" ]; then
   ln -s -f ${MAPLE_ROOT}/tools/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang ${TOOL_BIN_PATH}/clang
   ln -s -f ${MAPLE_ROOT}/tools/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/llvm-ar ${TOOL_BIN_PATH}/llvm-ar
   ln -s -f ${MAPLE_ROOT}/tools/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/llvm-ranlib ${TOOL_BIN_PATH}/llvm-ranlib
-  ln -s -f /usr/bin/qemu-aarch64 ${TOOL_BIN_PATH}/qemu-aarch64
 else
   ln -s -f /usr/bin/clang++ ${TOOL_BIN_PATH}/clang++
   ln -s -f /usr/bin/clang ${TOOL_BIN_PATH}/clang
   ln -s -f /usr/bin/llvm-ar ${TOOL_BIN_PATH}/llvm-ar
   ln -s -f /usr/bin/llvm-ranlib ${TOOL_BIN_PATH}/llvm-ranlib
-  ln -s -f ${MAPLE_ROOT}/tools/qemu/package/usr/bin/qemu-aarch64 ${TOOL_BIN_PATH}/qemu-aarch64
 fi
-ln -s -f ${MAPLE_ROOT}/tools/open64_prebuilt/x86/aarch64/bin/clangfe ${TOOL_BIN_PATH}/clangfe
+ln -s -f ${MAPLE_ROOT}/tools/qemu/package/usr/bin/qemu-aarch64 ${TOOL_BIN_PATH}/qemu-aarch64
 
 if [ ! -d $MAPLE_ROOT/../ThirdParty ]; then
   cd $MAPLE_ROOT/../