[Bug c/51628] __attribute__((packed)) is unsafe in some cases

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51628

--- Comment #38 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch is posted at

https://gcc.gnu.org/ml/gcc-patches/2018-01/msg01237.html