[PATCH] D46218: PR37275 packed attribute should not apply to base classes

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith created this revision.
rsmith added a reviewer: rjmccall.

Clang incorrectly applies the packed attribute to base classes. Per GCC's documentation and as can be observed from its behavior, packed only applies to members, not base classes.

This change is conditioned behind `-fclang-abi-compat` so that an ABI break can be avoided by users if desired.


Repository:
  rC Clang

https://reviews.llvm.org/D46218

Files:
  lib/AST/RecordLayoutBuilder.cpp
  test/CodeGenCXX/alignment.cpp
  test/SemaCXX/class-layout.cpp

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