rust/compiler/rustc_codegen_ssa
bors a2b1646c59 Auto merge of #86844 - bjorn3:global_alloc_improvements, r=pnkfelix
Support #[global_allocator] without the allocator shim

This makes it possible to use liballoc/libstd in combination with `--emit obj` if you use `#[global_allocator]`. This is what rust-for-linux uses right now and systemd may use in the future. Currently they have to depend on the exact implementation of the allocator shim to create one themself as `--emit obj` doesn't create an allocator shim.

Note that currently the allocator shim also defines the oom error handler, which is normally required too. Once `#![feature(default_alloc_error_handler)]` becomes the only option, this can be avoided. In addition when using only fallible allocator methods and either `--cfg no_global_oom_handling` for liballoc (like rust-for-linux) or `--gc-sections` no references to the oom error handler will exist.

To avoid this feature being insta-stable, you will have to define `__rust_no_alloc_shim_is_unstable` to avoid linker errors.

(Labeling this with both T-compiler and T-lang as it originally involved both an implementation detail and had an insta-stable user facing change. As noted above, the `__rust_no_alloc_shim_is_unstable` symbol requirement should prevent unintended dependence on this unstable feature.)
2023-05-25 16:59:57 +00:00
..
src Auto merge of #86844 - bjorn3:global_alloc_improvements, r=pnkfelix 2023-05-25 16:59:57 +00:00
Cargo.toml Auto merge of #111413 - workingjubilee:bump-object-0-31-1, r=MarkSimulacrum 2023-05-20 13:19:37 +00:00
messages.ftl Fix static string lints 2023-04-25 18:59:55 +01:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.