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).

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Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[rust-bors]

💔 Test for 7069335 failed: CI. Failed jobs:

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[ZuseZ4]

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[rust-timer]

Awaiting bors try build completion.

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[rust-bors]

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

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[ZuseZ4]

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[rust-timer]

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

[rust-bors]

💔 Test for de7bdfa failed: CI. Failed jobs:

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[ZuseZ4]

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@rustbot label: +S-waiting-on-perf

[rust-log-analyzer]

The job dist-x86_64-linux failed! Check out the build log: (web) (plain enhanced) (plain)

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

sccache: Listening on address 127.0.0.1:4226
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--enable-full-tools', '--enable-sanitizers', '--enable-profiler', '--enable-compiler-docs', '--set', 'target.x86_64-unknown-linux-gnu.linker=clang', '--set', 'target.x86_64-unknown-linux-gnu.ar=/rustroot/bin/llvm-ar', '--set', 'target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib', '--set', 'llvm.thin-lto=true', '--set', 'llvm.ninja=false', '--set', 'llvm.offload=true', '--set', 'llvm.clang=true', '--set', 'llvm.lld=true', '--set', 'llvm.libzstd=true', '--set', 'rust.jemalloc', '--set', 'rust.bootstrap-override-lld=true', '--set', 'rust.lto=thin', '--set', 'rust.codegen-units=1', '--set', 'build.print-step-timings', '--enable-verbose-tests', '--set', 'build.metrics', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--set', 'rust.lld=true', '--set', 'build.optimized-compiler-builtins', '--release-channel=nightly', '--enable-llvm-static-stdcpp', '--set', 'rust.remap-debuginfo', '--debuginfo-level-std=1', '--set', 'rust.codegen-backends=llvm,cranelift']
configure: rust.codegen-backends := ['llvm']
configure: rust.lld             := True
configure: rust.llvm-tools      := True
configure: rust.llvm-bitcode-linker := True
configure: build.extended       := True
---
configure: rust.debuginfo-level-std := 1
configure: profile              := dist
Traceback (most recent call last):
  File "/checkout/src/bootstrap/configure.py", line 804, in <module>
    section_order, sections, targets = parse_args(sys.argv[1:])
  File "/checkout/src/bootstrap/configure.py", line 462, in parse_args
    return parse_example_config(known_args, config)
  File "/checkout/src/bootstrap/configure.py", line 654, in parse_example_config
    configure_file(sections, top_level_keys, targets, config)
  File "/checkout/src/bootstrap/configure.py", line 743, in configure_file
    configure_section(sections[section_key], section_config)
  File "/checkout/src/bootstrap/configure.py", line 715, in configure_section
    raise RuntimeError("failed to find config line for {}".format(key))
RuntimeError: failed to find config line for lld
  local time: Sat Nov 15 00:46:12 UTC 2025
  network time: Sat, 15 Nov 2025 00:46:12 GMT

[rust-bors]

💔 Test for 1ef3951 failed: CI. Failed jobs:

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