The Rust runtime

This section documents features that define some aspects of the Rust runtime.

The global_allocator attribute

The global_allocator attribute is used on a static item implementing the GlobalAlloc trait to set the global allocator.

The windows_subsystem attribute

The windows_subsystem attribute may be applied at the crate level to set the subsystem when linking on a Windows target.

It uses the MetaNameValueStr syntax to specify the subsystem with a value of either console or windows.

This attribute is ignored on non-Windows targets, and for non-bin crate types.

The “console” subsystem is the default. If a console process is run from an existing console then it will be attached to that console, otherwise a new console window will be created.

The “windows” subsystem is commonly used by GUI applications that do not want to display a console window on startup. It will run detached from any existing console.

#![allow(unused)]
#![windows_subsystem = "windows"]
fn main() {
}