[PATCH] D155539: [CUDA][HIP] Use the same default language std as C++

[Yaxun Liu via Phabricator via cfe-commits]

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Currently CUDA/HIP defines their own language standards in LanguageStandards.def but they are redundant. They are the same as stdc++14. The fact that CUDA/HIP uses c++* in option `-std=` indicates that they have the same language standards as C++. The CUDA/HIP specific language features are conveyed through language options, not language standards features. It makes sense to let CUDA/HIP uses the same default language standard as C++.


https://reviews.llvm.org/D155539

Files:
  clang/include/clang/Basic/LangStandards.def
  clang/lib/Basic/LangStandards.cpp
  clang/test/CodeGenCUDA/long-double.cu
  clang/test/Driver/unknown-std.cpp
  clang/test/Preprocessor/lang-std.cpp

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