✨ fn_abi

A proc attribute macro that sets the ABI/calling convention for the attributed function.

Example

#[macro_use]
extern crate fn_abi;

#[abi("fastcall")]
extern fn hello_world() {
    println!("hello world!");
}

#[cfg_attr(all(target_os = "windows", target_pointer_width = "32"), abi("thiscall"))]
#[cfg_attr(all(target_os = "windows", target_pointer_width = "64"), abi("fastcall"))]
extern fn hello_world() {
    println!("hello world!");
}

Shortcuts

fn_abi supports a number of target shortcuts that you can use.

#[abi(
    linux32 = "C",
    linux64 = "C",
    win32 = "thiscall",
    win64 = "fastcall"
)]
extern fn hello_world() {
    println!("hello world!");
}

Supported Targets

Currently, the macro will translate the following targets to their respective cfg attributes:

Please feel free to contribute if you find a target that is not supported.