Solaris core dump with McMillan Installer
gmcm at hypernet.com
Thu Oct 25 17:46:44 CEST 2001
>> > So does anyone know what the worst case alignment rule is for
>> > structs?
[Martin von Loewis]
> If you are talking about C structs, you should be aware that the
> layout varies from system to system; in particular, the internal
> padding may change.
> So if you have a single worst-case alignment, the structure fields may
> still end up on the wrong positions on some systems.
Internal padding is not the issue - the struct is 4 ints, 2 chars, then
something defined as char, but which can be nearly any length. The first
int tells me how long the "struct" really is. C lacks a term for such a
beast - maybe it could be called an implicitly-linked-list.
> On most systems requiring primitive types to be aligned, the alignment
> is 8 if they support a "double" type. On Ultra-SPARC, the worst-case
> alignment is 16, for the "long double" type.
I was going to guess 8, but I guess I better use 16.
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