[PATCH] D51789: [WIP][clang] Add the no_extern_template attribute

[Louis Dionne via Phabricator via llvm-commits]

ldionne created this revision.
ldionne added reviewers: rsmith, rjmccall.
Herald added subscribers: llvm-commits, dexonsmith.

This attribute allows excluding a member of a class template from being part
of an explicit template instantiation of that class template. This also makes
sure that code using such a member will not take for granted that an external
instantiation exists in another translation unit. The attribute was discussed
on cfe-dev at [1] and is primarily motivated by the removal of always_inline
in libc++ to control what's part of the ABI (see links in [1]).

[1]: http://lists.llvm.org/pipermail/cfe-dev/2018-August/059024.html

rdar://problem/43428125


Repository:
  rL LLVM

https://reviews.llvm.org/D51789

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaDeclAttr.cpp
  clang/lib/Sema/SemaTemplateInstantiate.cpp
  clang/test/CodeGenCXX/attribute_no_extern_template.explicit_instantiation.cpp
  clang/test/CodeGenCXX/attribute_no_extern_template.extern_declaration.cpp
  clang/test/CodeGenCXX/attribute_no_extern_template.merge_redeclarations.cpp
  clang/test/SemaCXX/attr-no_extern_template.diagnose_when_undefined.cpp
  clang/test/SemaCXX/attr-no_extern_template.valid_entities.cpp

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