diff --git a/build.sh b/build.sh
index dc28732e239d3205ee672899e526aa294f8bc366..c4c98c4a2a837735b514b71c19aebccc7fbc00ea 100755
--- a/build.sh
+++ b/build.sh
@@ -5,6 +5,7 @@ C_COMPILER_PATH=gcc
 CXX_COMPILER_PATH=g++
 
 # Initialize our own variables:
+enable_autotuner="0"
 buildtype=RelWithDebInfo
 backends="ARM;AArch64;X86"
 build_for_openeuler="0"
@@ -47,6 +48,7 @@ Usage: $0 [options]
 Build the compiler under $build_prefix, then install under $install_prefix.
 
 Options:
+  -a       Enable BiSheng-Autotuner.
   -b type  Specify CMake build type (default: $buildtype).
   -c       Use ccache (default: $use_ccache).
   -e       Build for embedded cross tool chain.
@@ -67,8 +69,11 @@ EOF
 
 # Process command-line options. Remember the options for passing to the
 # containerized build script.
-while getopts :b:ceEhiI:j:orstvfX: optchr; do
+while getopts :ab:ceEhiI:j:orstvfX: optchr; do
   case "$optchr" in
+    a)
+      enable_autotuner="1"
+      ;;
     b)
       buildtype="$OPTARG"
       case "${buildtype,,}" in
@@ -197,6 +202,11 @@ if [ $build_for_openeuler == "1" ]; then
   CMAKE_OPTIONS="$CMAKE_OPTIONS -DBUILD_FOR_OPENEULER=ON"
 fi
 
+if [ $enable_autotuner == "1" ]; then
+  echo "enable BiSheng-Autotuner"
+  CMAKE_OPTIONS="$CMAKE_OPTIONS -DLLVM_ENABLE_AUTOTUNER=ON"
+fi
+
 # Build and install
 if [ $clean -eq 1 -a -e "$install_prefix" ]; then
   rm -rf "$install_prefix"
diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
index 949f12d3ce8c813e9d46534af7bf29b70f297cd8..98fcb6ea1a078b26f6671354e3a35d8df3ebc0eb 100644
--- a/clang/CMakeLists.txt
+++ b/clang/CMakeLists.txt
@@ -322,6 +322,10 @@ if (BUILD_FOR_OPENEULER)
   add_definitions( -DBUILD_FOR_OPENEULER )
 endif()
 
+if (LLVM_ENABLE_AUTOTUNER)
+  add_definitions( -DENABLE_AUTOTUNER )
+endif()
+
 # Determine HOST_LINK_VERSION on Darwin.
 set(HOST_LINK_VERSION)
 if (APPLE AND NOT CMAKE_LINKER MATCHES ".*lld.*")