Option for nopartialord

Input C/C++ Header

enum A {
	A0 = 0,
	A1 = 1,
};

struct B {
	char *name;
	unsigned age;
};

Bindgen Invocation

$ bindgen input.h  --rustified-enum "*" --with-derive-partialeq --with-derive-partialord

Actual Results

#[repr(u32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, PartialOrd)]
pub enum A {
    A0 = 0,
    A1 = 1,
}
#[repr(C)]
#[derive(Debug, Copy, Clone, PartialOrd, PartialEq)]
pub struct B {
    pub name: *mut ::std::os::raw::c_char,
    pub age: ::std::os::raw::c_uint,
}

I get PartialOrd for enum A and struct B. That is fine for enum A since I need its elements to be comparable; but I don't want this behavior for struct B (e.g. name needs some special treatment for comparison).

Currently, we cannot enable PartialOrd on some types but disable on other types, so I've naively added this option

$bindgen input.h --rustified-enum '*' --with-derive-partialeq --with-derive-partialord --no-partialord B

Expected Results

#[repr(u32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, PartialOrd)]
pub enum A {
    A0 = 0,
    A1 = 1,
}
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct B {
    pub name: *mut ::std::os::raw::c_char,
    pub age: ::std::os::raw::c_uint,
}

I don't know whether this behavior is something that bindgen want (or doesn't want) to cover, or there are details that I cannot see yet.

Many thanks for any comment.

Start with the bindgen command-line handling for --with-derive-partialord and the derive-selection path; the issue names no repository files or tests. Trace how --rustified-enum and --with-derive-partialord select types, then verify that --no-partialord B removes PartialOrd from B while leaving it on enum A.