update CXX compiler from 11 to 14

[lzxzy]

According to 31037

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[peterjc123]

cc @soumith

[soumith]

cc: @yf225 @smessmer

I am not sure if I should merge this right now, or wait for the 14 transition to finish

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[holly1238]

Hi @lzxzy! Can you sign the CLA agreement so that I can merge the pull request? Thanks!

[lzxzy]

Sure, thanks for your remind. I have signed the CLA just now. holly1238 ***@***.***> 于2021年4月17日周六 上午6:16写道：

…

Hi @lzxzy <https://github.com/lzxzy>! Can you sign the CLA agreement so that I can merge the pull request? Thanks! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#766 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC7PAMLXPXH3IO3IL7OZSV3TJCZKLANCNFSM4JY23NQA> .

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