Use Go 1.23's new structs.HostLayout

[TotallyGamerJet]

Operating System

• Windows
• macOS
• Linux
• FreeBSD
• Android
• iOS

What feature would you like to be added?

Use structs.HostLayout in all Platform specific structs

Why is this needed?

In Go 1.23, a new package and type called structs.HostLayout was added in golang/go#66408. Adding this field to a struct instructs the compiler to guarantee the struct matches the C ABI.

We currently, rely on the fact that Go's current struct layout matches the C ABI. The following is an incomplete list of structs that must match C ABI.

• objc_super
• G
• ThreadStart
• pthread_mutex_t
• pthread_cond_t

As well as all the one's in struct_test.go, objc_runtime_darwin_test.go and in the examples/window platform files

This is not urgent as there is no current plan to change Go's struct layout