[all-commits] [llvm/llvm-project] c5fb1a: Revert "[Clang] Ignore BTFTag attr if used as a ty...

[yonghong-song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c5fb1a09533ec2ed43a80f39c1592e5ee887ef9e
      https://github.com/llvm/llvm-project/commit/c5fb1a09533ec2ed43a80f39c1592e5ee887ef9e
  Author: Yonghong Song <yhs at fb.com>
  Date:   2021-10-11 (Mon, 11 Oct 2021)

  Changed paths:
    M clang/include/clang/Basic/Attr.td
    M clang/include/clang/Basic/AttrDocs.td
    M clang/lib/AST/TypePrinter.cpp
    M clang/lib/Sema/SemaType.cpp
    M clang/test/Sema/attr-btf_tag.c

  Log Message:
  -----------
  Revert "[Clang] Ignore BTFTag attr if used as a type attribute"

This reverts commit b875343873a584965daf507d73ff1fe71eab1953.

Per discussion in https://reviews.llvm.org/D111199, instead to make
existing btf_tag attribute as a type-or-decl attribute, we will
make existing btf_tag attribute as a decl only attribute, and
introduce btf_type_tag as a type only attribute. This will make
it easy for cases like typedef where an attribute may be applied
as either a type attribute or a decl attribute.