!385 riscv64: set -march default to rv64gc

From: @laokz 
Reviewed-by: @xiongzhou4, @cf-zhao 
Signed-off-by: @cf-zhao

gcc.spec

@@ -2,7 +2,7 @@
 %global gcc_major 12
 # Note, gcc_release must be integer, if you want to add suffixes to
 # %%{release}, append them after %%{gcc_release} on Release: line.
-%global gcc_release 16
+%global gcc_release 17
 
 %global _unpackaged_files_terminate_build 0
 %global _performance_build 1
@@ -756,7 +756,7 @@ CONFIGURE_OPTS="\
 	--with-arch_64=x86-64-v2 \
 %endif
 %ifarch riscv64
-	--with-arch=rv64g --with-abi=lp64d --disable-libquadmath \
+	--with-arch=rv64gc --with-abi=lp64d --disable-libquadmath \
 %endif
 %ifnarch sparc sparcv9 ppc
 	--build=%{gcc_target_platform} \
@@ -2888,6 +2888,10 @@ end
 %doc rpm.doc/changelogs/libcc1/ChangeLog*
 
 %changelog
+* Mon Jan 15 2024 laokz <zhangkai@iscas.ac.cn> 12.3.1-17
+- Type: SPEC
+- DESC: riscv64 -march default to rv64gc
+
 * Mon Sep 11 2023 dingguangya <dingguangya1@huawei.com> 12.3.1-16
 - Type: Sync
 - DESC: Sync patch from openeuler/gcc