!19 LLVM平行宇宙：支持使用clang构建gmp

From: @cf-zhao 
Reviewed-by: @liqingqing_1229 
Signed-off-by: @liqingqing_1229

gmp.spec

@@ -1,6 +1,6 @@
 Name: gmp
 Version: 6.3.0
-Release: 1
+Release: 2
 Epoch: 1
 URL: https://gmplib.org
 Source0: https://gmplib.org/download/gmp/gmp-%{version}.tar.xz
@@ -35,7 +35,11 @@ GMP dependent library for C++ applications.
 
 %build
 if as --help | grep -q execstack; then
+%if "%toolchain" == "clang"
+  export CCAS="clang -c -Wa,--noexecstack"
+%else
   export CCAS="gcc -c -Wa,--noexecstack"
+%endif
 fi
 
 %ifarch %{ix86}
@@ -90,6 +94,9 @@ export LD_LIBRARY_PATH=`pwd`/.libs
 %{_libdir}/pkgconfig/gmpxx.pc
 
 %changelog
+* Sat Aug 05 2023 cf-zhao <zhaochuanfeng@huawei.com> 1:6.3.0-2
+- Support build with clang
+
 * Mon Jul 31 2023 Funda Wang <fundawang@yeah.net> - 1:6.3.0-1
 - New version 6.3.0