From 4f7521916d12e07d25d5175f2da9614624344a7b Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 18 Oct 2024 15:03:01 +0200
Subject: [PATCH] rust: modernize link_section usage for ELF platforms
Some newer ABI implementations do not provide .ctors; and while
some linkers rewrite .ctors into .init_array, not all of them do.
Use the newer .init_array ABI, which works more reliably, and
apply it to all non-Apple, non-Windows platforms.
This is similar to how the ctor crate operates; without this change,
"#[derive(Object)]" does not work on Fedora 41.
Reviewed-by: Junjie Mao <junjie.mao@hotmail.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
rust/qemu-api-macros/src/lib.rs | 7 +++++--
rust/qemu-api/src/definitions.rs | 14 ++++++++++----
2 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/rust/qemu-api-macros/src/lib.rs b/rust/qemu-api-macros/src/lib.rs
index 59aba592d9..70e3f92046 100644
--- a/rust/qemu-api-macros/src/lib.rs
+++ b/rust/qemu-api-macros/src/lib.rs
@@ -16,8 +16,11 @@ pub fn derive_object(input: TokenStream) -> TokenStream {
let expanded = quote! {
#[allow(non_upper_case_globals)]
#[used]
- #[cfg_attr(target_os = "linux", link_section = ".ctors")]
- #[cfg_attr(target_os = "macos", link_section = "__DATA,__mod_init_func")]
+ #[cfg_attr(
+ not(any(target_vendor = "apple", target_os = "windows")),
+ link_section = ".init_array"
+ )]
+ #[cfg_attr(target_vendor = "apple", link_section = "__DATA,__mod_init_func")]
#[cfg_attr(target_os = "windows", link_section = ".CRT$XCU")]
pub static #module_static: extern "C" fn() = {
extern "C" fn __register() {
diff --git a/rust/qemu-api/src/definitions.rs b/rust/qemu-api/src/definitions.rs
index 49ac59af12..3323a665d9 100644
--- a/rust/qemu-api/src/definitions.rs
+++ b/rust/qemu-api/src/definitions.rs
@@ -31,8 +31,11 @@ pub trait Class {
macro_rules! module_init {
($func:expr, $type:expr) => {
#[used]
- #[cfg_attr(target_os = "linux", link_section = ".ctors")]
- #[cfg_attr(target_os = "macos", link_section = "__DATA,__mod_init_func")]
+ #[cfg_attr(
+ not(any(target_vendor = "apple", target_os = "windows")),
+ link_section = ".init_array"
+ )]
+ #[cfg_attr(target_vendor = "apple", link_section = "__DATA,__mod_init_func")]
#[cfg_attr(target_os = "windows", link_section = ".CRT$XCU")]
pub static LOAD_MODULE: extern "C" fn() = {
extern "C" fn __load() {
@@ -48,8 +51,11 @@ macro_rules! module_init {
// NOTE: To have custom identifiers for the ctor func we need to either supply
// them directly as a macro argument or create them with a proc macro.
#[used]
- #[cfg_attr(target_os = "linux", link_section = ".ctors")]
- #[cfg_attr(target_os = "macos", link_section = "__DATA,__mod_init_func")]
+ #[cfg_attr(
+ not(any(target_vendor = "apple", target_os = "windows")),
+ link_section = ".init_array"
+ )]
+ #[cfg_attr(target_vendor = "apple", link_section = "__DATA,__mod_init_func")]
#[cfg_attr(target_os = "windows", link_section = ".CRT$XCU")]
pub static LOAD_MODULE: extern "C" fn() = {
extern "C" fn __load() {