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Auto merge of #103894 - mati865:gnullvm-libunwind-changes, r=thomcc

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Change the way libunwind is linked for *-windows-gnullvm targets

I have no idea why previous way works for `x86_64-fortanix-unknown-sgx` (assuming it actually works...) but not for `gnullvm`. It fails when linking libtest during Rust build (unless somebody adds `RUSTFLAGS='-Clinkarg=-lunwind'`).
Also fixes exception handling on AArch64.
This commit is contained in:
bors 2022-11-13 21:12:48 +00:00
commit 7b513af6c4
4 changed files with 9 additions and 8 deletions
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2
library/std/src/personality/gcc.rs
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@ -219,7 +219,7 @@ fn __gnu_unwind_frame(
}
cfg_if::cfg_if! {
if #[cfg(all(windows, target_arch = "x86_64", target_env = "gnu"))] {
if #[cfg(all(windows, any(target_arch = "aarch64", target_arch = "x86_64"), target_env = "gnu"))] {
// On x86_64 MinGW targets, the unwinding mechanism is SEH however the unwind
// handler data (aka LSDA) uses GCC-compatible encoding.
#[lang = "eh_personality"]

4
library/unwind/src/lib.rs
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@ -103,7 +103,3 @@
#[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
#[link(name = "unwind", kind = "static", modifiers = "-bundle")]
extern "C" {}
#[cfg(all(target_os = "windows", target_env = "gnu", target_abi = "llvm"))]
#[link(name = "unwind", kind = "static", modifiers = "-bundle")]
extern "C" {}

8
library/unwind/src/libunwind.rs
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@ -36,9 +36,12 @@ pub enum _Unwind_Reason_Code {
#[cfg(all(target_arch = "arm", any(target_os = "ios", target_os = "watchos")))]
pub const unwinder_private_data_size: usize = 5;
#[cfg(all(target_arch = "aarch64", target_pointer_width = "64"))]
#[cfg(all(target_arch = "aarch64", target_pointer_width = "64", not(target_os = "windows")))]
pub const unwinder_private_data_size: usize = 2;
#[cfg(all(target_arch = "aarch64", target_pointer_width = "64", target_os = "windows"))]
pub const unwinder_private_data_size: usize = 6;
#[cfg(all(target_arch = "aarch64", target_pointer_width = "32"))]
pub const unwinder_private_data_size: usize = 5;
@ -90,7 +93,10 @@ pub enum _Unwind_Context {}
// rustc_codegen_ssa::src::back::symbol_export, rustc_middle::middle::exported_symbols
// and RFC 2841
#[cfg_attr(
any(
all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
all(target_os = "windows", target_env = "gnu", target_abi = "llvm")
),
link(name = "unwind", kind = "static", modifiers = "-bundle")
)]
extern "C-unwind" {

1
src/bootstrap/compile.rs
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@ -206,7 +206,6 @@ fn copy_third_party_objects(
}
if target == "x86_64-fortanix-unknown-sgx"
|| target.contains("pc-windows-gnullvm")
|| builder.config.llvm_libunwind(target) == LlvmLibunwind::InTree
&& (target.contains("linux") || target.contains("fuchsia"))
{