9a3acece30
Running TLS destructors for a MSVC Windows binary requires the linker doesn't elide the `_tls_used` or `__tls_used` symbols (depending on the architecture). This is currently achieved via a `#[link_args]` hack but this only works for dynamically linked binaries because the link arguments aren't propagated to statically linked binaries. This commit alters the strategy to instead emit a volatile load from those symbols so LLVM can't elide it, forcing the reference to the symbol to stay alive as long as the callback function stays alive (which we've made sure of with the `#[linkage]` attribute). Closes #28111
31 lines
778 B
Rust
31 lines
778 B
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// no-prefer-dynamic
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static mut HIT: bool = false;
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struct Foo;
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impl Drop for Foo {
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fn drop(&mut self) {
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unsafe { HIT = true; }
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}
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}
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thread_local!(static FOO: Foo = Foo);
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fn main() {
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std::thread::spawn(|| {
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FOO.with(|_| {});
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}).join().unwrap();
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assert!(unsafe { HIT });
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}
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