add additional warning options for clang

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

autogen.spec

@@ -1,6 +1,6 @@
 Name:		autogen
 Version:	5.18.16
-Release:	3
+Release:	4
 License:	GPLv2+ and GPLv3+
 Summary:	Automated text file generator
 URL:		http://www.gnu.org/software/autogen/
@@ -45,8 +45,13 @@ Man pages and other related documents.
 
 %build
 # Static libraries are needed to run test-suite.
-export CFLAGS="$RPM_OPT_FLAGS -Wno-implicit-fallthrough -Wno-format-overflow \
+CFLAGS="$RPM_OPT_FLAGS -Wno-implicit-fallthrough -Wno-format-overflow \
 		-Wno-format-truncation"
+%if "%toolchain" == "clang"
+CFLAGS+=" -Wno-missing-field-initializers -Wno-format "
+%endif
+export CFLAGS
+
 %configure
 
 # Omit unused direct shared library dependencies.
@@ -104,6 +109,9 @@ echo "%{_libdir}" > $RPM_BUILD_ROOT/etc/ld.so.conf.d/%{name}-%{_arch}.conf
 %exclude %{_infodir}/dir
 
 %changelog
+* Thu Feb 1 2024 liyunfei<liyunfei33@huawei.com> - 5.18.16-4
+- add additional warning options for clang
+
 * Tue Oct 18 2022 zhangruifang <zhangruifang1@h-partners.com> - 5.18.16-3
 - fix stray blanking of config file char