autodiff: fix sysroot candidates in libEnzyme not found error by sgasho · Pull Request #163028 · rust-lang/rust

sgasho · 2026-09-19T17:05:23Z

Before

RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run
info: `cargo` is unavailable for the active toolchain
info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo"
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1)
  --- stderr
  error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23` folder in the sysroot candidates:
         * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib
    |
    = note: it will be distributed via rustup in the future

After: points out the right candidate dir

RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run --release
info: `cargo` is unavailable for the active toolchain
info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo"
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1)
  --- stderr
  error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23.so` in the sysroot candidates:
         * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib
    |
    = note: it will be distributed via rustup in the future

I also verified that sample autodiff code ran successfully using local build, without breaking anything.

r? @ZuseZ4

rustbot · 2026-09-19T17:05:27Z

Some changes occurred in compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs

cc @ZuseZ4

ZuseZ4 · 2026-10-07T19:40:52Z

@bors try jobs=dist-x86_64-linux,optional-test-x86_64-gnu-autodiff

autodiff: fix sysroot candidates in libEnzyme not found error try-job: dist-x86_64-linux try-job: optional-test-x86_64-gnu-autodiff

ZuseZ4 · 2026-10-07T20:17:29Z

@bors r=me if try comes out green

rust-bors · 2026-10-07T20:17:33Z

📌 Commit 38d5ee3 has been approved by me

It is now in the queue for this repository.

⚠️ The following reviewer(s) could not be found: me

ZuseZ4 · 2026-10-07T20:19:06Z

@bors r-

rust-bors · 2026-10-07T20:19:12Z

This pull request was unapproved.

View changes since this unapproval

rust-bors · 2026-10-07T21:30:45Z

☀️ Try build successful (CI)
Build commit: d038b84 (d038b84a4ac3122b4d1086c8aaf430b4d3191850)
Base parent: 8d1a764 (8d1a76430406c877b35d0b627e7f796dcf0dfeca)

ZuseZ4 · 2026-10-07T21:33:13Z

@bors r+ rollup

rust-bors · 2026-10-07T21:33:17Z

📌 Commit 38d5ee3 has been approved by ZuseZ4

It is now in the queue for this repository.

@ZuseZ4

…useZ4 autodiff: fix sysroot candidates in libEnzyme not found error fix: rust-lang#160335 (comment) Before ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23` folder in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib | = note: it will be distributed via rustup in the future ``` After: points out the right candidate dir ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run --release info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23.so` in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib | = note: it will be distributed via rustup in the future ``` I also verified that sample autodiff code ran successfully using local build, without breaking anything. r? @ZuseZ4

@ZuseZ4

…useZ4 autodiff: fix sysroot candidates in libEnzyme not found error fix: rust-lang#160335 (comment) Before ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23` folder in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib | = note: it will be distributed via rustup in the future ``` After: points out the right candidate dir ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run --release info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23.so` in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib | = note: it will be distributed via rustup in the future ``` I also verified that sample autodiff code ran successfully using local build, without breaking anything. r? @ZuseZ4

@ZuseZ4

…useZ4 autodiff: fix sysroot candidates in libEnzyme not found error fix: rust-lang#160335 (comment) Before ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23` folder in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib | = note: it will be distributed via rustup in the future ``` After: points out the right candidate dir ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run --release info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23.so` in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib | = note: it will be distributed via rustup in the future ``` I also verified that sample autodiff code ran successfully using local build, without breaking anything. r? @ZuseZ4

…uwer Rollup of 10 pull requests Successful merges: - #162741 (codegen: tell LLVM that the discriminant is a power of two) - #162758 (Split PassMode::IndirectUnsized out of PassMode::Indirect) - #163931 (Move `loop_hint_attrs` from `Terminator` into `TerminatorKind::Goto`) - #163028 (autodiff: fix sysroot candidates in libEnzyme not found error) - #163538 (Add `rustc::missing_generic_type_visitable` lint) - #163841 ([rustdoc] Fix more `incoherent_impl` linking) - #163908 (Update Enzyme submodule) - #163935 (Use BasicBlock::start_location and Location::START) - #163949 (disable next-solver with higher-ranked-assumptions) - #163951 (relax_elf_relocations is x86-only)

…uwer Rollup of 11 pull requests Successful merges: - #162741 (codegen: tell LLVM that the discriminant is a power of two) - #162758 (Split PassMode::IndirectUnsized out of PassMode::Indirect) - #163931 (Move `loop_hint_attrs` from `Terminator` into `TerminatorKind::Goto`) - #163028 (autodiff: fix sysroot candidates in libEnzyme not found error) - #163257 (abby DSL: sanity checks on forall where clauses) - #163841 ([rustdoc] Fix more `incoherent_impl` linking) - #163908 (Update Enzyme submodule) - #163935 (Use BasicBlock::start_location and Location::START) - #163949 (disable next-solver with higher-ranked-assumptions) - #163951 (relax_elf_relocations is x86-only) - #163968 (Remove needs-triage label from relnotes issues)

@ZuseZ4

Rollup merge of #163028 - sgasho:enzyme-wrapper-cleanup, r=ZuseZ4 autodiff: fix sysroot candidates in libEnzyme not found error fix: #160335 (comment) Before ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23` folder in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib | = note: it will be distributed via rustup in the future ``` After: points out the right candidate dir ```shell RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme run --release info: `cargo` is unavailable for the active toolchain info: falling back to "/home/gh-sgasho/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo" error: failed to run `rustc` to learn about target-specific information Caused by: process didn't exit successfully: `/home/gh-sgasho/.rustup/toolchains/enzyme/bin/rustc - --crate-name ___ --print=file-names -Zautodiff=Enable --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit status: 1) --- stderr error: autodiff backend not found in the sysroot: failed to find a `libEnzyme-23.so` in the sysroot candidates: * /home/gh-sgasho/rust-worktrees/enzyme-wrapper-cleanup/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib | = note: it will be distributed via rustup in the future ``` I also verified that sample autodiff code ran successfully using local build, without breaking anything. r? @ZuseZ4

…uwer Rollup of 11 pull requests Successful merges: - rust-lang/rust#162741 (codegen: tell LLVM that the discriminant is a power of two) - rust-lang/rust#162758 (Split PassMode::IndirectUnsized out of PassMode::Indirect) - rust-lang/rust#163931 (Move `loop_hint_attrs` from `Terminator` into `TerminatorKind::Goto`) - rust-lang/rust#163028 (autodiff: fix sysroot candidates in libEnzyme not found error) - rust-lang/rust#163257 (abby DSL: sanity checks on forall where clauses) - rust-lang/rust#163841 ([rustdoc] Fix more `incoherent_impl` linking) - rust-lang/rust#163908 (Update Enzyme submodule) - rust-lang/rust#163935 (Use BasicBlock::start_location and Location::START) - rust-lang/rust#163949 (disable next-solver with higher-ranked-assumptions) - rust-lang/rust#163951 (relax_elf_relocations is x86-only) - rust-lang/rust#163968 (Remove needs-triage label from relnotes issues)

autodiff: fix sysroot candidates in libEnzyme not found error

38d5ee3

rustbot assigned ZuseZ4 Sep 19, 2026

rust-bors Bot pushed a commit that referenced this pull request Oct 7, 2026

Auto merge of #163028 - sgasho:enzyme-wrapper-cleanup, r=<try>

d038b84

autodiff: fix sysroot candidates in libEnzyme not found error try-job: dist-x86_64-linux try-job: optional-test-x86_64-gnu-autodiff

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jhpratt mentioned this pull request Oct 8, 2026

Rollup of 11 pull requests #163961

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Rollup of 11 pull requests #163963

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Rollup of 10 pull requests #163969

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Rollup of 11 pull requests #163970

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Toolchain upgrade to nightly-2026-10-09 flux-rs/flux#1811

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autodiff: fix sysroot candidates in libEnzyme not found error - #163028

autodiff: fix sysroot candidates in libEnzyme not found error#163028
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