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

[YAMAMOTO Takashi via Phabricator via cfe-commits]

yamt added a comment.

> musttail provide assurances that the tail call can be optimized on all targets.

Such a definition doesn't make much sense because for some targets tail call optimization isn't available at all.
Eg. Wasm w/o tail call proposal, xtensa windowed abi.

So I'm not sure what's the point of the new attribute. It seems simpler to fix the existing musttail attribute.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D147714/new/

https://reviews.llvm.org/D147714