diff arm-none-linux-gnueabi( 9 or lastest) and arm-linux-gnueabi(gcc 8.3/2) and symver

https://developer.arm.com/-/media/Files/downloads/gnu-a/10.2-2020.11/binrel/gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf.tar.xz?revision=d0b90559-3960-4e4b-9297-7ddbc3e52783&la=en&hash=985078B758BC782BC338DB947347107FBCF8EF6B

https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf.tar.xz?revision=e09a1c45-0ed3-4a8e-b06b-db3978fd8d56&la=en&hash=93ED4444B8B3A812B893373B490B90BBB28FD2E3

1. what is diff  arm-none-linux-gnueabi and arm-linux-gnueabi ? 

2. why gcc8.3 not enable-symver ? 

//cd  gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf

$ echo "#include <string>" | ./bin/arm-linux-gnueabihf-g++ -dM -E -x c++ - | grep SYMVER
>> #define _GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE 1

$ strings arm-linux-gnueabihf/lib/libstdc++.so.6 | grep GLIBCXX
>> GLIBCXX_FORCE_NEW
>> GLIBCXX_DEBUG_MESSAGE_LENGTH

// cd gcc-arm-10.2-2020.11-x86_64-arm-none-linux-gnueabihf

$ echo "#include <string>" | ./bin/arm-none-linux-gnueabihf-g++ -dM -E -x c++ - | grep SYMVER
>> #define _GLIBCXX_SYMVER_GNU 1
>> #define _GLIBCXX_SYMVER 1
>> #define _GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT 1
>> #define _GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE 1

---

$ strings arm-none-linux-gnueabihf/lib/libstdc++.so.6 | grep GLIBCXX
GLIBCXX_3.4
GLIBCXX_3.4.1
GLIBCXX_3.4.2
GLIBCXX_3.4.3
GLIBCXX_3.4.4
GLIBCXX_3.4.5
GLIBCXX_3.4.6
GLIBCXX_3.4.7
GLIBCXX_3.4.8
GLIBCXX_3.4.9
GLIBCXX_3.4.10
GLIBCXX_3.4.11
GLIBCXX_3.4.12
GLIBCXX_3.4.13
GLIBCXX_3.4.14
GLIBCXX_3.4.15
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBCXX_3.4.21
GLIBCXX_3.4.22
GLIBCXX_3.4.23
GLIBCXX_3.4.24
GLIBCXX_3.4.25
GLIBCXX_3.4.26
GLIBCXX_3.4.27
GLIBCXX_3.4.28