aaa

CentOS 7 is going EOL on June 30, after which its package repos will no
longer exist on the regular mirrors. We'll still be able to access
packages from the vault server though, and can start doing so now. This
affects `dist-i686-linux` and `dist-x86_64-linux`.

I also removed `epel-release` because we were only using that for its
`cmake3`, but we've been building our own version for a while.

…subtyping

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Signed-off-by: onur-ozkan <work@onurozkan.dev>

* Allow crt-static for dylibs
* Pass -lgcc to the linker

Co-Authored-By: Jeremy Soller <jackpot51@gmail.com>

…ge, r=estebank

Indicate in `non_local_defs` lint that the macro needs to change

This PR adds a note to indicate that the macro needs to change in the `non_local_definitions` lint output.

Address rust-lang#125089 (comment)
Fixes rust-lang#125681
r? ````@estebank````

…rister

rustc_span: Add conveniences for working with span formats

This is the refactoring part of rust-lang#125017.

Consistently use subtyping in method resolution

fixes rust-lang#126062

An earlier version of this PR modified how we compute variance, but the root cause was an inconsistency between the usage of `eq` and `sub`, where we assumed that the latter passing implies the former will pass.

r? `@compiler-errors`

Various Redox OS fixes and add i686 Redox OS target

All of these come from the fork used by Redox OS available at https://gitlab.redox-os.org/redox-os/rust/-/commits/redox-2024-05-11/?ref_type=heads.

cc `@jackpot51`

ci: Update centos:7 to use vault repos

CentOS 7 is going EOL on June 30, after which its package repos will no
longer exist on the regular mirrors. We'll still be able to access
packages from the vault server though, and can start doing so now. This
affects `dist-i686-linux` and `dist-x86_64-linux`.

I also removed `epel-release` because we were only using that for its
`cmake3`, but we've been building our own version for a while.

try-job: dist-i686-linux
try-job: dist-x86_64-linux

Use `Variance` glob imported variants everywhere

Fully commit to using the globbed variance. Could be convinced the other way, and change this PR to not use the globbed variants anywhere, but I'd rather we do one or the other.

r? lcnr

MIR Shl/Shr: the offset can be computed with rem_euclid

r? `@scottmcm`

…=Kobzol

build `libcxx-version` only when it doesn't exist

In rust-lang#126423, it seems like c++ parsing takes quite amount of time on bootstrap startups. This PR makes libcxx-version to be compiled only when it doesn't exist.

A simple demonstration on the overhead of buiding `libcxx-version`:

```sh
$ rm -rf build/host/libcxx-version

$ x build
Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.07s

 ----- LIBCXX VERSION CHECK TOOK: 509ms
Building tool rustdoc (stage1 -> stage2, x86_64-unknown-linux-gnu)
    Finished `release` profile [optimized] target(s) in 0.25s
Build completed successfully in 0:00:02

$ x build
Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.07s

 ----- LIBCXX VERSION CHECK TOOK: 2ms
Creating a sysroot for stage2 compiler (use `rustup toolchain link 'name' build/host/stage2`)
Building tool rustdoc (stage1 -> stage2, x86_64-unknown-linux-gnu)
    Finished `release` profile [optimized] target(s) in 0.14s
Build completed successfully in 0:00:01
```