Offload bootstrap

[ZuseZ4]

The recommended way to build the offload project changed.
While already at it, testing how much overhead we get from building (or shipping) the two runtimes.

r? @Kobzol

[rustbot]

This PR changes how LLVM is built. Consider updating src/bootstrap/download-ci-llvm-stamp.

[ZuseZ4]

@bors2 try @rust-timer queue

(@Kobzol feel free to change if you want to see something else).

[rust-bors]

💔 Test for 7069335 failed: CI. Failed jobs:

• try - dist-x86_64-linux (web logs, extended logs)

[ZuseZ4]

@bors2 try @rust-timer queue

[rust-bors]

💔 Test for 31000c9 failed: CI. Failed jobs:

• try - dist-x86_64-linux (web logs, extended logs)

[ZuseZ4]

@bors2 try @rust-timer queue

[rust-bors]

💔 Test for de7bdfa failed: CI. Failed jobs:

• try - dist-x86_64-linux (web logs, extended logs)

[ZuseZ4]

@bors2 try @rust-timer queue

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[ZuseZ4]

@bors try

[rust-log-analyzer]

The job pr-check-2 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

[RUSTC-TIMING] build_helper test:false 0.705
error: useless use of `format!`
    --> src/bootstrap/src/core/build_steps/compile.rs:2308:33
     |
2308 |                 let libenzyme = format!("libLLVMOffload");
     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"libLLVMOffload".to_string()`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
     = note: `-D clippy::useless-format` implied by `-D warnings`
     = help: to override `-D warnings` add `#[allow(clippy::useless_format)]`

error: useless use of `format!`
    --> src/bootstrap/src/core/build_steps/compile.rs:2317:31
     |
2317 |                     let omp = format!("libomp");
     |                               ^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"libomp".to_string()`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format

error: useless use of `format!`
    --> src/bootstrap/src/core/build_steps/compile.rs:2324:31
     |
2324 |                     let tgt = format!("libomptarget");
     |                               ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"libomptarget".to_string()`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format

error: useless use of `format!`
    --> src/bootstrap/src/core/build_steps/compile.rs:2335:34
     |
2335 |                     let device = format!("libompdevice.a");
     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"libompdevice.a".to_string()`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format

error: the borrowed expression implements the required traits
    --> src/bootstrap/src/core/build_steps/compile.rs:2337:55
     |
2337 |                         let dst_tgt_dir = libdir.join(&tgt);
     |                                                       ^^^^ help: change this to: `tgt`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrows_for_generic_args
     = note: `-D clippy::needless-borrows-for-generic-args` implied by `-D warnings`
     = help: to override `-D warnings` add `#[allow(clippy::needless_borrows_for_generic_args)]`

error: the borrowed expression implements the required traits
    --> src/bootstrap/src/core/build_steps/compile.rs:2338:69
     |
2338 |                         let target_tgt_dst_dir = target_libdir.join(&tgt);
     |                                                                     ^^^^ help: change this to: `tgt`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrows_for_generic_args

[RUSTC-TIMING] bootstrap test:false 9.886
error: could not compile `bootstrap` (lib) due to 6 previous errors

[rust-bors]

☀️ Try build successful (CI)
Build commit: 4df11ec (4df11ecebe9814b078b13ccddd761d7c00933a49, parent: 61cc47e367d7be91e13bcd01e4e96e0e233d4f6d)