diff --git a/ceph.spec b/ceph.spec
index ce5f180341017d1ef5eddfce8c2a978d315790ae..e51a15720cb4dea61fc9df5565d4e9928e1723f7 100644
--- a/ceph.spec
+++ b/ceph.spec
@@ -24,6 +24,7 @@
 %bcond_with zbd
 %bcond_with cmake_verbose_logging
 %bcond_without ceph_test_package
+%bcond_with clang
 %ifarch s390
 %bcond_with tcmalloc
 %else
@@ -120,12 +121,16 @@
 # disable dwz which compresses the debuginfo
 %global _find_debuginfo_dwz_opts %{nil}
 
+%if 0%{with clang}
+%global toolchain clang 
+%endif
+
 #################################################################################
 # main package definition
 #################################################################################
 Name:		ceph
 Version:	16.2.7
-Release:	15
+Release:	16
 %if 0%{?fedora} || 0%{?rhel} || 0%{?openEuler}
 Epoch:		2
 %endif
@@ -183,8 +188,13 @@ BuildRequires:	fuse-devel
 %if 0%{with seastar}
 BuildRequires:	gcc-toolset-9-gcc-c++ >= 9.2.1-2.3
 %else
+%if 0%{with clang}
+BuildRequires:  clang
+BuildRequires:  llvm
+%else
 BuildRequires:	gcc-c++
 %endif
+%endif
 %if 0%{with tcmalloc}
 # libprofiler did not build on ppc64le until 2.7.90
 %if 0%{?fedora} || 0%{?rhel} >= 8 || 0%{?openEuler}
@@ -1363,7 +1373,16 @@ cat ./CMakeFiles/CMakeOutput.log
 cat ./CMakeFiles/CMakeError.log
 %endif
 
+#add clang+LLVM support
+%if %{with clang}
+%global make_opts HOSTCC=clang CC=clang CXX=clang++
+%endif
+%if %{with clang}
+make %{?make_opts} "$CEPH_MFLAGS_JOBS"
+%else
 make "$CEPH_MFLAGS_JOBS"
+%endif
+
 
 
 %if 0%{with make_check}
@@ -2500,6 +2519,9 @@ exit 0
 %config %{_sysconfdir}/prometheus/ceph/ceph_default_alerts.yml
 
 %changelog
+* Wed Mar 8 2023 zhoumeng<zhoumeng@isrc.iscas.ac.cn> - 2:16.2.7-16
+- add clang+llvm support for ceph compiling 
+
 * Tue Feb 14 2023 wangzengliang<wangzengliang2@huawei.com> - 2:16.2.7-15
 - fix error for uninstall cephadm