Distribute LLVM bitcode linker as a preview component #123423

kjetilkjeka · 2024-04-03T16:54:55Z

The self-contained LLVM bitcode linker was recently added in #117458. It is currently only in use to link the Nvidia ptx assembly tests when running rustc tests (local or CI). In fact, the linker itself is currently only usable for the nvptx64-nvidia-cuda target, but more targets will be supported in the future.

The reason a new linker was needed for the ptx format is that the old one has not been updated the last few years. It worked fine for a while, but as LLVM changed it broke and the nvptx tests was disabled in rustc back in 2019. It was ad-hoc patched and have been used in a sub-optimal state by the community until now.

If this PR is merged, the LLVM bitcode linker will be distributed as a preview component that can be used as a replacement for the old ptx-linker for development in addition to rustc tests. In addition to installing the llvm-bitcode-linker component, also the llvm-tools component must be installed as the llvm-bitcode-linker works by calling llvm tools.

Even though the LLVM bitcode linker is in its early stages it already now provides a lot of value over the old ptx-linker just by working and using up-to-date llvm tooling. By shipping it as a component it will be easier to gather user experience and improving it.

@petrochenkov when installing as a component it will be installed in the self-contained folder and will not work with -Clink-self-contained=no (although for some reason I expect to be a bug -Clink-self-contained=-linker doesn't properly disable it). However, when building using x.py build it will be placed in the lib/rustlib/<target>/bin directory and will be available for internal tests even if -Clink-self-contained=no is passed.

CC: @Mark-Simulacrum as I very briefly discussed it with you some months ago https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/.E2.9C.94.20How.20to.20ship.20a.20new.20tool.20.28embedded.20linker.29.20to.20users.3F

rustbot · 2024-04-03T16:55:03Z

r? @clubby789

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src/bootstrap/src/core/build_steps/install.rs

clubby789 · 2024-04-06T00:08:32Z

lgtm other than the typo. Since Mark originally suggested it I'm going to assign them to make sure this is the right procedure
r? @Mark-Simulacrum

Mark-Simulacrum

r=me with commits squashed

Mark-Simulacrum · 2024-04-13T13:41:39Z

src/bootstrap/src/utils/tarball.rs

@@ -64,6 +65,9 @@ impl OverlayKind {
                "compiler/rustc_codegen_cranelift/LICENSE-APACHE",
                "compiler/rustc_codegen_cranelift/LICENSE-MIT",
            ],
+            OverlayKind::LlvmBitcodeLinker => {


Why is this a separate/new overlay kind rather than just using OverlayKind::Rust?

The idea was to provide the readme of the llvm-bitcode-linker. I have corrected the path to point to this readme file now.

rustbot · 2024-04-15T12:59:18Z

The Miri subtree was changed

cc @rust-lang/miri

Some changes occurred in match lowering

cc @Nadrieril

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

Mark-Simulacrum · 2024-04-15T13:41:54Z

@bors r+ rollup=iffy

bors · 2024-04-15T13:41:57Z

📌 Commit 235d45e has been approved by Mark-Simulacrum

It is now in the queue for this repository.

…mponent, r=Mark-Simulacrum Distribute LLVM bitcode linker as a preview component The self-contained LLVM bitcode linker was recently added in rust-lang#117458. It is currently only in use to link the Nvidia ptx assembly tests when running rustc tests (local or CI). In fact, the linker itself is currently only usable for the `nvptx64-nvidia-cuda` target, but more targets will be supported in the future. The reason a new linker was needed for the ptx format is that the [old one](https://github.com/denzp/rust-ptx-linker) has not been updated the last few years. It worked fine for a while, but as LLVM changed it broke and the nvptx tests was [disabled in rustc back in 2019](rust-lang@f8f9a28). It was ad-hoc patched and have been used in a sub-optimal state by the community until now. If this PR is merged, the LLVM bitcode linker will be distributed as a preview component that can be used as a replacement for the old ptx-linker for development in addition to rustc tests. In addition to installing the `llvm-bitcode-linker` component, also the `llvm-tools` component must be installed as the `llvm-bitcode-linker` works by calling llvm tools. Even though the LLVM bitcode linker is in its early stages it already now provides a lot of value over the old ptx-linker just by working and using up-to-date llvm tooling. By shipping it as a component it will be easier to gather user experience and improving it. `@petrochenkov` when installing as a component it will be installed in the self-contained folder and will not work with `-Clink-self-contained=no` (although for some reason I expect to be a bug `-Clink-self-contained=-linker` doesn't properly disable it). However, when building using `x.py build` it will be placed in the `lib/rustlib/<target>/bin` directory and will be available for internal tests even if `-Clink-self-contained=no` is passed. CC: `@Mark-Simulacrum` as I very briefly discussed it with you some months ago https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/.E2.9C.94.20How.20to.20ship.20a.20new.20tool.20.28embedded.20linker.29.20to.20users.3F

Rollup of 12 pull requests Successful merges: - rust-lang#123423 (Distribute LLVM bitcode linker as a preview component) - rust-lang#123548 (libtest: also measure time in Miri) - rust-lang#123666 (Fix some typos in doc) - rust-lang#123864 (Remove a HACK by instead inferring opaque types during expected/formal type checking) - rust-lang#123896 (Migrate some diagnostics in `rustc_resolve` to session diagnostic) - rust-lang#123919 (builtin-derive: tag → discriminant) - rust-lang#123922 (Remove magic constants when using `base_n`.) - rust-lang#123931 (Don't leak unnameable types in `-> _` recover) - rust-lang#123933 (move the LargeAssignments lint logic into its own file) - rust-lang#123934 (`rustc_data_structures::graph` mini refactor) - rust-lang#123941 (Fix UB in LLVM FFI when passing zero or >1 bundle) - rust-lang#123957 (disable create_dir_all_bare test on all(miri, windows)) r? `@ghost` `@rustbot` modify labels: rollup

bors · 2024-04-15T19:14:19Z

⌛ Testing commit 235d45e with merge 99d0186...

Rollup merge of rust-lang#123423 - kjetilkjeka:llvm_bitcode_linker_component, r=Mark-Simulacrum Distribute LLVM bitcode linker as a preview component The self-contained LLVM bitcode linker was recently added in rust-lang#117458. It is currently only in use to link the Nvidia ptx assembly tests when running rustc tests (local or CI). In fact, the linker itself is currently only usable for the `nvptx64-nvidia-cuda` target, but more targets will be supported in the future. The reason a new linker was needed for the ptx format is that the [old one](https://github.com/denzp/rust-ptx-linker) has not been updated the last few years. It worked fine for a while, but as LLVM changed it broke and the nvptx tests was [disabled in rustc back in 2019](rust-lang@f8f9a28). It was ad-hoc patched and have been used in a sub-optimal state by the community until now. If this PR is merged, the LLVM bitcode linker will be distributed as a preview component that can be used as a replacement for the old ptx-linker for development in addition to rustc tests. In addition to installing the `llvm-bitcode-linker` component, also the `llvm-tools` component must be installed as the `llvm-bitcode-linker` works by calling llvm tools. Even though the LLVM bitcode linker is in its early stages it already now provides a lot of value over the old ptx-linker just by working and using up-to-date llvm tooling. By shipping it as a component it will be easier to gather user experience and improving it. ``@petrochenkov`` when installing as a component it will be installed in the self-contained folder and will not work with `-Clink-self-contained=no` (although for some reason I expect to be a bug `-Clink-self-contained=-linker` doesn't properly disable it). However, when building using `x.py build` it will be placed in the `lib/rustlib/<target>/bin` directory and will be available for internal tests even if `-Clink-self-contained=no` is passed. CC: ``@Mark-Simulacrum`` as I very briefly discussed it with you some months ago https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/.E2.9C.94.20How.20to.20ship.20a.20new.20tool.20.28embedded.20linker.29.20to.20users.3F

kjetilkjeka · 2024-04-16T08:40:45Z

When checking if this component made it into nightly today I'm running

$ rustup +nightly-2024-04-16 component list | grep llvm
llvm-tools-x86_64-unknown-linux-gnu

And the llvm-bitcode-linker is not picked up. I thought rustup would pick up on new available components. Is that wrong and something must be done in rustup as well?

Edit: I guess it's not rustup as I cannot find the component here as well https://static.rust-lang.org/dist/2024-04-16. Then I assume it must be something related to deployment scripts.

Edit2: It seems to me like the distribution script is running python3 x.py dist bootstrap --include-default-paths and copying files. This should include the llvm-bitcode-linker so I'm a bit confused to why it doesn't happen.

…ild_manifest, r=Mark-Simulacrum Add llvm-bitcode-linker to build manifest When creating rust-lang#123423 I didn't realize I also had to add the new component to the build-manifest. This PR finishes the work of adding it, by also adding it to the build manifest. r? `@Mark-Simulacrum`

…ild_manifest, r=Mark-Simulacrum Add llvm-bitcode-linker to build manifest When creating rust-lang#123423 I didn't realize I also had to add the new component to the build-manifest. This PR finishes the work of adding it, by also adding it to the build manifest. r? ``@Mark-Simulacrum``

Rollup merge of rust-lang#124071 - kjetilkjeka:llvm_bitcode_linker_build_manifest, r=Mark-Simulacrum Add llvm-bitcode-linker to build manifest When creating rust-lang#123423 I didn't realize I also had to add the new component to the build-manifest. This PR finishes the work of adding it, by also adding it to the build manifest. r? ``@Mark-Simulacrum``

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kjetilkjeka force-pushed the llvm_bitcode_linker_component branch from 9922d1e to a4ef243 Compare April 4, 2024 09:28

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kjetilkjeka force-pushed the llvm_bitcode_linker_component branch from 24e140b to 30e6af0 Compare April 15, 2024 12:59

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Distribute LLVM bitcode linker as a preview component

235d45e

kjetilkjeka force-pushed the llvm_bitcode_linker_component branch from 30e6af0 to 235d45e Compare April 15, 2024 13:39

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Rollup of 13 pull requests #123966

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Rollup of 12 pull requests #123968

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Add llvm-bitcode-linker to build manifest #124071

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Distribute LLVM bitcode linker as a preview component #123423

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