[gcc r12-6835] RISC-V: Change default ISA version into 20191213

[Kito Cheng]

https://gcc.gnu.org/g:98416dbb0a62579d4a7a4a76bab51b5b52fec2cd

commit r12-6835-g98416dbb0a62579d4a7a4a76bab51b5b52fec2cd
Author: Jia-Wei Chen <jiawei@iscas.ac.cn>
Date:   Tue Jan 18 10:34:24 2022 +0800

    RISC-V: Change default ISA version into 20191213
    
    Bump default ISA spec to newer version 20191213, current default ISA spec
    is 2.2, but it's already out of date for a long time, sync with binutils
    ISA version, convention in toolchain use.
    
    gcc/ChangeLog:
    
            * config.gcc: Modify default isa_spec version.

Diff:
---
 gcc/config.gcc | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 2c4266ce7b0..90aec3f8f3f 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4641,12 +4641,12 @@ case "${target}" in
 		esac
 
 		case "${with_isa_spec}" in
-		""|default|2.2)
-			tm_defines="${tm_defines} TARGET_DEFAULT_ISA_SPEC=ISA_SPEC_CLASS_2P2"
-			;;
-		20191213 | 201912)
+		""|default|20191213|201912)
 			tm_defines="${tm_defines} TARGET_DEFAULT_ISA_SPEC=ISA_SPEC_CLASS_20191213"
 			;;
+		2.2)
+			tm_defines="${tm_defines} TARGET_DEFAULT_ISA_SPEC=ISA_SPEC_CLASS_2P2"
+			;;
 		20190608 | 201906)
 			tm_defines="${tm_defines} TARGET_DEFAULT_ISA_SPEC=ISA_SPEC_CLASS_20190608"
 			;;