!30 Support build with clang

From: @luofeng14 
Reviewed-by: @liqingqing_1229 
Signed-off-by: @liqingqing_1229

gmp.spec

@@ -1,6 +1,6 @@
 Name: gmp
 Version: 6.2.1
-Release: 2
+Release: 3
 Epoch: 1
 URL: https://gmplib.org
 Source0: https://gmplib.org/download/gmp/gmp-%{version}.tar.bz2
@@ -36,7 +36,11 @@ GMP dependent library for C++ applications.
 %build
 autoreconf -ifv
 if as --help | grep -q execstack; then
-  export CCAS="gcc -c -Wa,--noexecstack"
+  %if "%toolchain" == "clang"
+    export CCAS="clang -c -Wa,--noexecstack"
+  %else
+    export CCAS="gcc -c -Wa,--noexecstack"
+  %endif
 fi
 
 %ifarch %{ix86}
@@ -97,6 +101,9 @@ make %{?_smp_mflags} check
 %{_libdir}/pkgconfig/gmpxx.pc
 
 %changelog
+* Mon Nov 6 2023 luofeng <luofeng13@huawei.com> 6.2.1-3
+- Support build with clang
+
 * Fri Jul 30 2021 chenyanpanHW <chenyanpan@huawei.com> - 6.2.1-2
 - DESC: delete -S git from %autosetup, and delete BuildRequires git