warning: `clash` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:14:13 | LL | fn clash(x: u8); | ---------------- `clash` previously declared here ... LL | fn clash(x: u64); | ^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(u8)` found `unsafe extern "C" fn(u64)` note: the lint level is defined here --> $DIR/clashing-extern-fn.rs:4:9 | LL | #![warn(clashing_extern_declarations)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ warning: `extern_link_name` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:52:9 | LL | / #[link_name = "extern_link_name"] LL | | fn some_new_name(x: i16); | |_____________________________- `extern_link_name` previously declared here ... LL | fn extern_link_name(x: u32); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(i16)` found `unsafe extern "C" fn(u32)` warning: `some_other_extern_link_name` redeclares `some_other_new_name` with a different signature --> $DIR/clashing-extern-fn.rs:55:9 | LL | fn some_other_new_name(x: i16); | ------------------------------- `some_other_new_name` previously declared here ... LL | / #[link_name = "some_other_new_name"] LL | | LL | | fn some_other_extern_link_name(x: u32); | |_______________________________________________^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(i16)` found `unsafe extern "C" fn(u32)` warning: `other_both_names_different` redeclares `link_name_same` with a different signature --> $DIR/clashing-extern-fn.rs:59:9 | LL | / #[link_name = "link_name_same"] LL | | fn both_names_different(x: i16); | |____________________________________- `link_name_same` previously declared here ... LL | / #[link_name = "link_name_same"] LL | | LL | | fn other_both_names_different(x: u32); | |______________________________________________^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(i16)` found `unsafe extern "C" fn(u32)` warning: `different_mod` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:72:9 | LL | fn different_mod(x: u8); | ------------------------ `different_mod` previously declared here ... LL | fn different_mod(x: u64); | ^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(u8)` found `unsafe extern "C" fn(u64)` warning: `variadic_decl` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:82:9 | LL | fn variadic_decl(x: u8, ...); | ----------------------------- `variadic_decl` previously declared here ... LL | fn variadic_decl(x: u8); | ^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(u8, ...)` found `unsafe extern "C" fn(u8)` warning: `weigh_banana` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:142:13 | LL | fn weigh_banana(count: *const Banana) -> u64; | --------------------------------------------- `weigh_banana` previously declared here ... LL | fn weigh_banana(count: *const Banana) -> u64; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(*const one::Banana) -> u64` found `unsafe extern "C" fn(*const three::Banana) -> u64` warning: `draw_point` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:171:13 | LL | fn draw_point(p: Point); | ------------------------ `draw_point` previously declared here ... LL | fn draw_point(p: Point); | ^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn(sameish_members::a::Point)` found `unsafe extern "C" fn(sameish_members::b::Point)` warning: `origin` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:197:13 | LL | fn origin() -> Point3; | ---------------------- `origin` previously declared here ... LL | fn origin() -> Point3; | ^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> same_sized_members_clash::a::Point3` found `unsafe extern "C" fn() -> same_sized_members_clash::b::Point3` warning: `transparent_incorrect` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:220:13 | LL | fn transparent_incorrect() -> T; | -------------------------------- `transparent_incorrect` previously declared here ... LL | fn transparent_incorrect() -> isize; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> T` found `unsafe extern "C" fn() -> isize` warning: `missing_return_type` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:238:13 | LL | fn missing_return_type() -> usize; | ---------------------------------- `missing_return_type` previously declared here ... LL | fn missing_return_type(); | ^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> usize` found `unsafe extern "C" fn()` warning: `non_zero_usize` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:256:13 | LL | fn non_zero_usize() -> core::num::NonZeroUsize; | ----------------------------------------------- `non_zero_usize` previously declared here ... LL | fn non_zero_usize() -> usize; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> NonZeroUsize` found `unsafe extern "C" fn() -> usize` warning: `non_null_ptr` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:258:13 | LL | fn non_null_ptr() -> core::ptr::NonNull; | ----------------------------------------------- `non_null_ptr` previously declared here ... LL | fn non_null_ptr() -> *const usize; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> NonNull` found `unsafe extern "C" fn() -> *const usize` warning: `option_non_zero_usize_incorrect` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:356:13 | LL | fn option_non_zero_usize_incorrect() -> usize; | ---------------------------------------------- `option_non_zero_usize_incorrect` previously declared here ... LL | fn option_non_zero_usize_incorrect() -> isize; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> usize` found `unsafe extern "C" fn() -> isize` warning: `option_non_null_ptr_incorrect` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:358:13 | LL | fn option_non_null_ptr_incorrect() -> *const usize; | --------------------------------------------------- `option_non_null_ptr_incorrect` previously declared here ... LL | fn option_non_null_ptr_incorrect() -> *const isize; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> *const usize` found `unsafe extern "C" fn() -> *const isize` warning: `hidden_niche_transparent_no_niche` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:408:13 | LL | fn hidden_niche_transparent_no_niche() -> usize; | ------------------------------------------------ `hidden_niche_transparent_no_niche` previously declared here ... LL | fn hidden_niche_transparent_no_niche() -> Option; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> usize` found `unsafe extern "C" fn() -> Option` warning: `hidden_niche_unsafe_cell` redeclared with a different signature --> $DIR/clashing-extern-fn.rs:412:13 | LL | fn hidden_niche_unsafe_cell() -> usize; | --------------------------------------- `hidden_niche_unsafe_cell` previously declared here ... LL | fn hidden_niche_unsafe_cell() -> Option>; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this signature doesn't match the previous declaration | = note: expected `unsafe extern "C" fn() -> usize` found `unsafe extern "C" fn() -> Option>` warning: `extern` block uses type `Option`, which is not FFI-safe --> $DIR/clashing-extern-fn.rs:408:55 | LL | fn hidden_niche_transparent_no_niche() -> Option; | ^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe | = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum = note: enum has no representation hint = note: `#[warn(improper_ctypes)]` on by default warning: `extern` block uses type `Option>`, which is not FFI-safe --> $DIR/clashing-extern-fn.rs:412:46 | LL | fn hidden_niche_unsafe_cell() -> Option>; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe | = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum = note: enum has no representation hint warning: 19 warnings emitted