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Warning at use site for #[repr(C)] type that contains non-#[repr(C)] types #16719
Description
#![allow(dead_code)]
struct Foo;
#[repr(C)]
struct Bar { x: Foo }
extern { fn whatever(x: Bar); }
fn main() {}<anon>:7:25: 7:28 warning: found type without foreign-function-safe
representation annotation in foreign module, consider adding a #[repr(...)] attribute to the type, #[warn(ctypes)] on by default
<anon>:7 extern { fn whatever(x: Bar); }
^~~
This could either be a warning on Bar, that Foo isn't FFI safe; or not a warning at all. (Or, at the very least, a note pointing to the x field, to help diagnose the problem.)
Activity
o11c commentedon Aug 24, 2014
Significantly, this occurs even if the struct contains only a pointer-to-non-repr-C-struct
frewsxcv commentedon Aug 20, 2015
Triage comment: the warning has not changed
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steveklabnik commentedon Feb 11, 2016
Since new lints have a big impact on users of rustc, the policy is that they should go through the RFC process like other user-facing changes. As such, I'm going to give this one a close, but if anyone comes across this ticket and wants this lint, consider adding it to clippy and/or writing up an RFC. Thanks!
Auto merge of rust-lang#16719 - lnicola:native-debug, r=lnicola