How can I get more information about "Should have a used entry for the template arg"? #2938
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Could you provide a reproducer? It's a bug in bindgen. |
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I have problem from large size closed source project. |
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Getting more idea about the problem. clang version: Apple clang version 16.0.0 (clang-1600.0.26.3) I added When I use When I give Using blocked type as other template type parameter seems to cause the problem |
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And it is not that simple. input: t.hpp template<typename T>
class A {
T raw;
};
template<typename T>
class B {
T raw;
};
class X {
A<int> a;
B<int> b;
A<B<int> > c;
};command: bindgen --blocklist-type 'B.*' t.hppoutput: /* automatically generated by rust-bindgen 0.70.1 */
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct A<T> {
pub _phantom_0: ::std::marker::PhantomData<::std::cell::UnsafeCell<T>>,
pub raw: T,
}
#[repr(C)]
pub struct X {
pub a: A<::std::os::raw::c_int>,
pub b: B<::std::os::raw::c_int>,
pub c: A<B<::std::os::raw::c_int>>,
}
#[allow(clippy::unnecessary_operation, clippy::identity_op)]
const _: () = {
["Size of X"][::std::mem::size_of::<X>() - 12usize];
["Alignment of X"][::std::mem::align_of::<X>() - 4usize];
["Offset of field: X::a"][::std::mem::offset_of!(X, a) - 0usize];
["Offset of field: X::b"][::std::mem::offset_of!(X, b) - 4usize];
["Offset of field: X::c"][::std::mem::offset_of!(X, c) - 8usize];
};
#[allow(clippy::unnecessary_operation, clippy::identity_op)]
const _: () = {
["Size of template specialization: A_open0_int_close0"]
[::std::mem::size_of::<A<::std::os::raw::c_int>>() - 4usize];
["Align of template specialization: A_open0_int_close0"]
[::std::mem::align_of::<A<::std::os::raw::c_int>>() - 4usize];
};
#[allow(clippy::unnecessary_operation, clippy::identity_op)]
const _: () = {
["Size of template specialization: A_open0_B_open1_int_close1_close0"]
[::std::mem::size_of::<A<B<::std::os::raw::c_int>>>() - 4usize];
["Align of template specialization: A_open0_B_open1_int_close1_close0"]
[::std::mem::align_of::<A<B<::std::os::raw::c_int>>>() - 4usize];
}; |
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I encountered this panic after upgrading macOS SDK.
It seems to be related to new C++ headers of the SDK. I'd like to check the related types and adding them to blocklist types.
Could you advise how can I check the error causing type names?
Error messages:
Related code: https://github.com/rust-lang/rust-bindgen/blob/main/bindgen/ir/analysis/template_params.rs#L240-L263
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