Add toolchain_clang build support

Signed-off-by: liyunfei <liyunfei33@huawei.com>

llvm-mlir.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
@@ -27,7 +32,7 @@
 
 Name:		%{pkg_name}
 Version:	%{mlir_version}
-Release:	1
+Release:	2
 Summary:	The MLIR project is a novel approach to building reusable and extensible compiler infrastructure.
 License:	Apache 2.0
 URL:		https://mlir.llvm.org/
@@ -106,6 +111,10 @@ Requires: python3-numpy
 	-DBUILD_SHARED_LIBS=OFF \
 	-DMLIR_INSTALL_AGGREGATE_OBJECTS=OFF \
 	-DMLIR_BUILD_MLIR_C_DYLIB=ON \
+%if "%{toolchain}" == "clang"
+	-DCMAKE_C_COMPILER=clang \
+	-DCMAKE_CXX_COMPILER=clang++ \
+%endif
 %ifarch aarch64 %ix86 ppc64le x86_64
 	-DLLVM_PARALLEL_LINK_JOBS=1 \
 %endif
@@ -196,6 +205,9 @@ export PYTHONPATH=%{buildroot}/%{python3_sitearch}
 %{python3_sitearch}/mlir/
 
 %changelog
+* Fri Jul 5 2024 liyunfei <liyunfei33@huawei.com> - 17.0.6-2
+- Add toolchain_clang build support
+
 * Sun Jun 25 2023 zhoujing <zhoujing106@huawei.com> - 17.0.6-1
 - Update to 17.0.6