On Wed, 2020-09-09 at 12:50 +0200, Jan Mercl wrote:
> On Wed, Sep 9, 2020 at 12:41 PM Dan Kortschak <[email protected]>
> wrote:
>
> > I get the following
> >
> > ```
> > C alignof struct s: 8
> > Go alignof struct s: 8
> > Go alignof S: 8
> > ~/cznic $ go version
> > go version go1.15.1 linux/arm64
> > ~/cznic $ uname -a
> > Linux bildr 4.19.0-10-arm64 #1 SMP Debian 4.19.132-1 (2020-07-24)
> > aarch64 GNU/Linux
> > ```
> >
> > I have an arm64 linux running on my pi, maybe the armv7l behaviour
> > is
> > different.
>
> Seems to be the case as armv7l is AFAIK a 32 bit only CPU. And arm64
> is next on the list of my targets so thank you for the information.
>
> But the question is still the same. Is it a bug or is my assumption
> about Go and C agreeing on alignments/offsets invalid? I realizethe
> specs say nothing in this regard.
What does cgo -godefs give you? On my amd64 and arm64 I get this:
```
~/cznic $ cat main.go
package main
/*
struct s {
long long i;
} x;
*/
import "C"
type S struct {
i int64
}
type C_s C.struct_s
~/cznic $ go tool cgo -godefs main.go
// Code generated by cmd/cgo -godefs; DO NOT EDIT.
// cgo -godefs main.go
package main
type S struct {
i int64
}
type C_s struct {
I int64
}
```
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