sys: hint that structs require host layout

internal/cmd/gentypes/main.go

@@ -98,6 +98,7 @@ package sys
 
 import (
 	"unsafe"
+	"structs"
 )
 
 `)
@@ -758,6 +759,8 @@ func outputPatchedStruct(gf *btf.GoFormatter, w *bytes.Buffer, id string, s *btf
 		return err
 	}
 
+	decl = strings.Replace(decl, "struct {", "struct { structs.HostLayout;", 1)
+
 	w.WriteString(decl)
 	w.WriteString("\n\n")
 	return nil

internal/sys/ptr_32_be.go

@@ -3,12 +3,14 @@
 package sys
 
 import (
+	"structs"
 	"unsafe"
 )
 
 // Pointer wraps an unsafe.Pointer to be 64bit to
 // conform to the syscall specification.
 type Pointer struct {
+	structs.HostLayout
 	pad uint32
 	ptr unsafe.Pointer
 }

internal/sys/ptr_32_le.go

@@ -3,12 +3,14 @@
 package sys
 
 import (
+	"structs"
 	"unsafe"
 )
 
 // Pointer wraps an unsafe.Pointer to be 64bit to
 // conform to the syscall specification.
 type Pointer struct {
+	structs.HostLayout
 	ptr unsafe.Pointer
 	pad uint32
 }

internal/sys/ptr_64.go

@@ -3,11 +3,13 @@
 package sys
 
 import (
+	"structs"
 	"unsafe"
 )
 
 // Pointer wraps an unsafe.Pointer to be 64bit to
 // conform to the syscall specification.
 type Pointer struct {
+	structs.HostLayout
 	ptr unsafe.Pointer
 }