mirror of
https://github.com/llvm/llvm-project.git
synced 2025-05-13 06:16:08 +00:00
e7300e75b5
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2350.htm made very clear that it is an UB having type definitions with in offsetof. Clang supports defining a type as the first argument as a conforming extension due to how many projects use the construct in C99 and earlier to calculate the alignment of a type. GCC also supports defining a type as the first argument. This adds extension warnings and documentation for the functionality Clang explicitly supports. Fixes #57065 Reverts the revert of 39da55e8f548a11f7dadefa73ea73d809a5f1729 Co-authored-by: Yingchi Long <i@lyc.dev> Co-authored-by: Aaron Ballman <aaron@aaronballman.com> Differential Revision: https://reviews.llvm.org/D133574