diff --git a/flang.spec b/flang.spec
index 356f65e8844dbeed69299a087f92ca6cdc4119d7..d3b61d099cdaf2916ab7c3b95b29b7a7bb2fd8e8 100644
--- a/flang.spec
+++ b/flang.spec
@@ -1,5 +1,10 @@
 %bcond_without sys_llvm
 %bcond_without check
+%bcond_without toolchain_clang
+
+%if %{with toolchain_clang}
+%global toolchain clang
+%endif
 
 %global maj_ver 17
 %global min_ver 0
@@ -31,7 +36,7 @@
 
 Name:    %{pkg_name}
 Version: %{flang_version}
-Release: 1
+Release: 2
 Summary: a Fortran language front-end designed for integration with LLVM
 
 License: Apache-2.0 WITH LLVM-exception
@@ -102,6 +107,10 @@ cd _build
        -DLLVM_EXTERNAL_LIT=%{_bindir}/lit \
        -DCMAKE_PREFIX_PATH=%{install_libdir}/cmake/llvm/ \
        -DLLVM_COMMON_CMAKE_UTILS=%{_datadir}/llvm/cmake \
+%if "%toolchain" == "clang"
+	-DCMAKE_C_COMPILER=clang \
+	-DCMAKE_CXX_COMPILER=clang++ \
+%endif
 \
 %if 0%{?__isa_bits} == 64
        -DLLVM_LIBDIR_SUFFIX=64
@@ -182,6 +191,9 @@ export LD_LIBRARY_PATH=%{_builddir}/%{flang_srcdir}/_build/lib
 %{install_libdir}/cmake/
 
 %changelog
+* Fri Jul 5 2024 liyunfei <liyunfei33@huawei.com> - 17.0.6-2
+- Add toolchain_clang build support
+
 * Tue Dec 5 2023 zhoujing <zhoujing106@huawei.com> - 17.0.6-1
 - Update to 17.0.6