Add conditionals for the CFLAGS that only the GCC compiler support

dovecot.spec

@@ -6,7 +6,7 @@
 
 Name:          dovecot
 Version:       2.3.20
-Release:       1
+Release:       2
 Summary:       Dovecot Secure imap server
 License:       MIT and LGPLv2.1
 URL:           http://www.dovecot.org/
@@ -84,7 +84,11 @@ echo "testsuite" >dovecot-2.3-pigeonhole-%{pigeonholever}/run-test-valgrind.excl
 sed -i '/DEFAULT_INCLUDES *=/s|$| '"$(pkg-config --cflags libclucene-core)|" src/plugins/fts-lucene/Makefile.in
 
 %build
-export CFLAGS="%{__global_cflags} -fno-strict-aliasing -fstack-reuse=none" LDFLAGS="-Wl,-z,now -Wl,-z,relro %{?__global_ldflags}"
+export CFLAGS="%{__global_cflags} -fno-strict-aliasing" LDFLAGS="-Wl,-z,now -Wl,-z,relro %{?__global_ldflags}"
+%if "%toolchain" == "gcc"
+    CFLAGS="$CFLAGS -fstack-reuse=none"
+    export CFLAGS
+%endif
 
 mkdir -p m4
 autoreconf -I . -fiv #required for aarch64 support
@@ -311,6 +315,9 @@ make check
 
 
 %changelog
+* Thu Aug 24 2023 Xiaoya Huang <huangxiaoya@iscas.ac.cn> - 1:2.3.20-2
+- Add conditionals for the CFLAGS that only the GCC compiler support
+
 * Fri Apr 07 2023 yaoxin <yao_xin001@hoperun.com> - 1:2.3.20-1
 - Update to 2.3.20