Auto merge of #81866 - nagisa:nagisa/sanitizer-support-target-prop, r=tmiasko

Maintain supported sanitizers as a target property

In an effort to remove a hard-coded allow-list for target-sanitizer support correspondence, this PR moves the configuration to the target options.

Perhaps the one notable change made in this PR is this doc-comment:

```rust
    /// The sanitizers supported by this target
    ///
    /// Note that the support here is at a codegen level. If the machine code with sanitizer
    /// enabled can generated on this target, but the necessary supporting libraries are not
    /// distributed with the target, the sanitizer should still appear in this list for the target.
```

Previously the target would typically be added to the allow-list at the same time as the supporting runtime libraries are shipped for the target. However whether we ship the runtime libraries or not needn't be baked into the compiler; and if we don't users will receive a significantly more directed error about library not being found.

Fixes #81802

3 files changed, 6 insertions, 5 deletions

diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
index 64ebe585dd8..594d42c9366 100644
--- a/compiler/rustc_codegen_llvm/src/attributes.rs
+++ b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -11,9 +11,9 @@ use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use rustc_middle::ty::layout::HasTyCtxt;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, TyCtxt};
-use rustc_session::config::{OptLevel, SanitizerSet};
+use rustc_session::config::OptLevel;
 use rustc_session::Session;
-use rustc_target::spec::StackProbeType;
+use rustc_target::spec::{SanitizerSet, StackProbeType};
 
 use crate::attributes;
 use crate::llvm::AttributePlace::Function;
diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
index 085935b94df..b3551177323 100644
--- a/compiler/rustc_codegen_llvm/src/back/write.rs
+++ b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -23,11 +23,11 @@ use rustc_fs_util::{link_or_copy, path_to_c_string};
 use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_middle::bug;
 use rustc_middle::ty::TyCtxt;
-use rustc_session::config::{self, Lto, OutputType, Passes, SanitizerSet, SwitchWithOptPath};
+use rustc_session::config::{self, Lto, OutputType, Passes, SwitchWithOptPath};
 use rustc_session::Session;
 use rustc_span::symbol::sym;
 use rustc_span::InnerSpan;
-use rustc_target::spec::{CodeModel, RelocModel, SplitDebuginfo};
+use rustc_target::spec::{CodeModel, RelocModel, SanitizerSet, SplitDebuginfo};
 use tracing::debug;
 
 use libc::{c_char, c_int, c_uint, c_void, size_t};
diff --git a/compiler/rustc_codegen_llvm/src/base.rs b/compiler/rustc_codegen_llvm/src/base.rs
index db8abdd9b13..6f6c649bb0b 100644
--- a/compiler/rustc_codegen_llvm/src/base.rs
+++ b/compiler/rustc_codegen_llvm/src/base.rs
@@ -32,8 +32,9 @@ use rustc_middle::middle::cstore::EncodedMetadata;
 use rustc_middle::middle::exported_symbols;
 use rustc_middle::mir::mono::{Linkage, Visibility};
 use rustc_middle::ty::TyCtxt;
-use rustc_session::config::{DebugInfo, SanitizerSet};
+use rustc_session::config::DebugInfo;
 use rustc_span::symbol::Symbol;
+use rustc_target::spec::SanitizerSet;
 
 use std::ffi::CString;
 use std::time::Instant;