✨ fn_abi

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

Example

```rust

[macro_use]

extern crate fn_abi;

[abi("fastcall")]

extern fn hello_world() { println!("hello world!"); }

[cfgattr(all(targetos = "windows", targetpointerwidth = "32"), abi("thiscall"))]

[cfgattr(all(targetos = "windows", targetpointerwidth = "64"), abi("fastcall"))]

extern fn hello_world() { println!("hello world!"); } ```

Shortcuts

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

```rust

[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:

| Shorthand | Expansion | |:---:|:---:| | linux | cfg(target_os = "linux") | | win | cfg(target_os = "windows") | | macos | cfg(target_os = "macos") | | linux32 | cfg(all(target_os = "linux", target_pointer_width = "32")) | | linux64 | cfg(all(target_os = "linux", target_pointer_width = "32")) | | win32 | cfg(all(target_os = "windows", target_pointer_width = "32")) | | win64 | cfg(all(target_os = "windows", target_pointer_width = "32")) | | macos32 | cfg(all(target_os = "macos", target_pointer_width = "32")) | | macos64 | cfg(all(target_os = "macos", target_pointer_width = "32")) |

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