??: PR 1098: "struct ipovly" not packed.
Aaron J. Grier
aaron at frye.com
Tue Jul 11 20:56:51 UTC 2006
On Tue, Jul 11, 2006 at 12:52:06PM -0500, Jay Monkman wrote:
> If __attribute__((packed)) is so wrong, what's the correct way to
> ensure a data structure is packed? If you look at the latest code in
> netbsd, they use it on their network data structures:
the original commits for the packed changes were done in 1999, and in a
couple cases, these changes have been backed out.
gcc4's builtin memcpy recently demonstrated trouble on MIPS with packed
structs and misalignment as well, prompting a re-examining of the use of
explicitly performing direct copies from/to members of a struct (of
default alignment) to/from an array of desired alignment (8/16/32)
appears to me the most robust way.
Aaron J. Grier | Frye Electronics, Tigard, OR | aaron at frye.com
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