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| -rw-r--r-- | compiler/rustc_target/src/spec/mod.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs index f7cf12215f3..a44d2af6b90 100644 --- a/compiler/rustc_target/src/spec/mod.rs +++ b/compiler/rustc_target/src/spec/mod.rs @@ -2213,6 +2213,10 @@ pub struct TargetOptions { /// `-Ctarget-cpu` but can be overwritten with `-Ctarget-features`. /// Corresponds to `llc -mattr=$features`. /// Note that these are LLVM feature names, not Rust feature names! + /// + /// Generally it is a bad idea to use negative target features because they often interact very + /// poorly with how `-Ctarget-cpu` works. Instead, try to use a lower "base CPU" and enable the + /// features you want to use. pub features: StaticCow<str>, /// Direct or use GOT indirect to reference external data symbols pub direct_access_external_data: Option<bool>, |