On Sat, Jun 24, 2000 at 06:37:16PM +0200, Xuan Baldauf wrote:
> IIRC there are dozens of structs shared between userspace and kernel
> space. Does that mean that all those structs are strictly speaking
> incompatible with each other, given that the compiler or CFLAGS are
> different?
Yes, the C standard gives a lot of flexibility to the compiler here.
I *think* it mandates that the fields in a struct are stored int the
same order that they are declared, but I'm not even 100% sure about this.
On UNIX systems, you can still use any C compiler that you like and link
with code compiled with another compiler, because the ABI (application
binary interface) standards makes some additional requirements. For example
on Linux systems we use the system V ABI which defines the precise layout
of the structs in a processor-specific addendum. That way we know that every
compliant compiler will use the same layout on a given system. We have no
guarantee that the layout will be the same on a different processor though.
--
Michel "Walken" LESPINASSE - Development Engineer at Wind River Systems
Join the army, meet interesting people, kill them.
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