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Auto merge of #89808 - tmiasko:llvm-multithreaded, r=nagisa

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Cleanup LLVM multi-threading checks

The support for runtime multi-threading was removed from LLVM. Calls to
`LLVMStartMultithreaded` became no-ops equivalent to checking if LLVM
was compiled with support for threads http://reviews.llvm.org/D4216.
This commit is contained in:
bors 2021-10-25 05:28:07 +00:00
commit 56694b0453
2 changed files with 6 additions and 16 deletions
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20
compiler/rustc_codegen_llvm/src/llvm_util.rs
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@ -17,35 +17,25 @@ use std::path::Path;
use std::ptr;
use std::slice;
use std::str;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Once;
static POISONED: AtomicBool = AtomicBool::new(false);
static INIT: Once = Once::new();
pub(crate) fn init(sess: &Session) {
unsafe {
// Before we touch LLVM, make sure that multithreading is enabled.
if llvm::LLVMIsMultithreaded() != 1 {
bug!("LLVM compiled without support for threads");
}
INIT.call_once(|| {
if llvm::LLVMStartMultithreaded() != 1 {
// use an extra bool to make sure that all future usage of LLVM
// cannot proceed despite the Once not running more than once.
POISONED.store(true, Ordering::SeqCst);
}
configure_llvm(sess);
});
if POISONED.load(Ordering::SeqCst) {
bug!("couldn't enable multi-threaded LLVM");
}
}
}
fn require_inited() {
INIT.call_once(|| bug!("llvm is not initialized"));
if POISONED.load(Ordering::SeqCst) {
bug!("couldn't enable multi-threaded LLVM");
if !INIT.is_completed() {
bug!("LLVM is not initialized");
}
}