[PATCH] D147714: [Attr] Introduce [[clang::nonportable_musttail]] as less strict version of [[clang::musttail]]

[Dávid Bolvanský via Phabricator via cfe-commits]

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As noted in https://github.com/llvm/llvm-project/issues/54964 , musttail provide assurances that the tail call can be optimized on all targets.

But some users could care only one specific target and if they use musttail attribute, they may see an Clang error about signatures mismatch. This mismatch is often a not a real problem in practice and LLVM can still emit tail call.

So... Introduce [[clang::nonportable_musttail]] which is a less strict version of [[clang::musttail]] (no checking if signatures fully match).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147714

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Sema/Sema.h
  clang/lib/Sema/SemaStmt.cpp
  clang/test/SemaCXX/attr-musttail.cpp

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