diff options
| -rw-r--r-- | compiler/rustc_lint/src/builtin.rs | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs index 9fba53196f6..9ebada0fff3 100644 --- a/compiler/rustc_lint/src/builtin.rs +++ b/compiler/rustc_lint/src/builtin.rs @@ -2740,8 +2740,9 @@ declare_lint! { /// /// ### Example /// - /// ```rust,compile_fail - /// # #![feature(asm_experimental_arch)] + /// ```rust,ignore (fails on non-x86_64) + /// #![cfg(target_arch = "x86_64")] + /// /// use std::arch::asm; /// /// fn main() { @@ -2751,19 +2752,32 @@ declare_lint! { /// } /// ``` /// - /// {{produces}} + /// This will produce: + /// + /// ```text + /// error: avoid using labels containing only the digits `0` and `1` in inline assembly + /// --> <source>:7:15 + /// | + /// 7 | asm!("0: jmp 0b"); + /// | ^ use a different label that doesn't start with `0` or `1` + /// | + /// = help: start numbering with `2` instead + /// = note: an LLVM bug makes these labels ambiguous with a binary literal number on x86 + /// = note: see <https://github.com/llvm/llvm-project/issues/99547> for more information + /// = note: `#[deny(binary_asm_labels)]` on by default + /// ``` /// /// ### Explanation /// - /// A [LLVM bug] causes this code to fail to compile because it interprets the `0b` as a binary - /// literal instead of a reference to the previous local label `0`. Note that even though the - /// bug is marked as fixed, it only fixes a specific usage of intel syntax within standalone - /// files, not inline assembly. To work around this bug, don't use labels that could be - /// confused with a binary literal. + /// An [LLVM bug] causes this code to fail to compile because it interprets the `0b` as a binary + /// literal instead of a reference to the previous local label `0`. To work around this bug, + /// don't use labels that could be confused with a binary literal. + /// + /// This behavior is platform-specific to x86 and x86-64. /// /// See the explanation in [Rust By Example] for more details. /// - /// [LLVM bug]: https://bugs.llvm.org/show_bug.cgi?id=36144 + /// [LLVM bug]: https://github.com/llvm/llvm-project/issues/99547 /// [Rust By Example]: https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels pub BINARY_ASM_LABELS, Deny, |