Restrict aarch64 outline atomics to glibc for now. #90044

hkratz · 2021-10-19T08:14:55Z

The introduced dependency on getauxval causes linking problems with musl, making compiling any binaries for aarch64-unknown-linux-musl impossible without workarounds such as using lld or adding liblibc.rlib again to the linker invocation, see #89626.

This is a workaround until libc>0.2.108 is merged.

rust-highfive · 2021-10-19T08:14:58Z

r? @oli-obk

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oli-obk · 2021-10-19T08:24:50Z

r? @workingjubilee

jbg · 2021-10-19T09:43:24Z

I may not understand how the features argument is interpreted, but shouldn't this be before the -C target-feature processing on line 417? It should be defaulting outline-atomics to on, but right now it seems to be forcing it to on, so -C target-feature=-outline-atomics doesn't do anything.

For example, right now you can't get a successful build on aarch64-unknown-linux-musl by setting RUSTFLAGS="-C target-feature=-outline-atomics". Presumably even after this patch, a glibc user can't disable the outline-atomics target feature if they want to.

hkratz · 2021-10-19T09:54:44Z

Allowing -C target-feature=-outline-atomics to override this setting would definitely be an improvement, but it would not work because the std library would still be compiled with it enabled.

But I can move the outline atomics block before -C target-feature processing code as well (later feature specs override earlier ones).

hkratz · 2021-11-04T11:40:25Z

If an updated libc with rust-lang/libc#2272 fixes it, then this is no longer needed. Let's wait for that.

@rustbot label -S-waiting-on-review +S-waiting-on-author

jbg · 2021-11-04T12:00:05Z

This issue does not only occur with a libc dependency in the tree. Even a no-deps Hello World program triggers it.

hkratz · 2021-11-04T15:02:03Z

This issue does not only occur with a libc dependency in the tree. Even a no-deps Hello World program triggers it.

Yes, but the std library uses rust-lang/libc. Having an unbundled libc.a at the right place in link order will resolve this problem as well.

workingjubilee · 2021-11-05T20:31:14Z

😩 Sorry for missing this. Let me see...

workingjubilee · 2021-11-05T21:32:20Z

So it looks like we accidentally broke musl on aarch64 because we aren't compiling musl in a way that is convenient for musl (already a known factor, really, but I didn't expect it to cause an issue here), and:

we may find out that a recent libc crate update fixes it when it lands
but we should try to get this resolved before it hits stable
and another PR against rust-lang/rust offers a known permanent fix Eventually

so this one should wait a little for that but not a long time, correct? Alright, I will keep this on my radar.

workingjubilee · 2021-11-05T21:42:20Z

Speaking of radar, it looks like we bumped LLVM to min 12. Accordingly, #90623 was opened, which remedies the FIXME and also will pose a merge conflict with this PR.

I would stop the rollup, but currently we seem to be inclined to let things ride for a few nights and hope a new libc fixes it, so might as well let it ride. It also addresses the second commit in this set.

bors · 2021-11-06T01:35:55Z

☔ The latest upstream changes (presumably #90631) made this pull request unmergeable. Please resolve the merge conflicts.

hkratz · 2021-11-06T19:08:07Z

If the libc update does not fix it, I will update this PR to just remove the +outline-atomics feature from the aarch64_unknown_linux_musl target spec.

Changelog: https://github.com/rust-lang/libc/releases/tag/0.2.107 Primarily intended to pull in fd331f65f214ea75b6210b415b5fd8650be15c73 This should help with rust-lang#90044

…itor Update libc to 0.2.107 Changelog: https://github.com/rust-lang/libc/releases/tag/0.2.107 Primarily intended to pull in rust-lang/libc@fd331f6 This should help with rust-lang#90044

The introduced dependency on `getauxval`causes linking problems with musl, see rust-lang#89626.

workingjubilee · 2021-11-24T20:04:51Z

I find this state of affairs baffling but I am going to approve this commit with a note here that it can't actually be backported in as-is form, so that this issue doesn't persist into the next beta cut.
@bors r+ rollup=always

bors · 2021-11-24T20:04:53Z

📌 Commit bd287fa has been approved by workingjubilee

…mics_for_musl, r=workingjubilee Restrict aarch64 outline atomics to glibc for now. The introduced dependency on `getauxval` causes linking problems with musl, making compiling any binaries for `aarch64-unknown-linux-musl` impossible without workarounds such as using lld or adding liblibc.rlib again to the linker invocation, see rust-lang#89626. This is a workaround until libc>0.2.108 is merged.

…laumeGomez Rollup of 7 pull requests Successful merges: - rust-lang#89542 (Partially stabilize `duration_consts_2`) - rust-lang#90044 (Restrict aarch64 outline atomics to glibc for now.) - rust-lang#90420 (Create rustdoc_internals feature gate) - rust-lang#91075 (Reduce prominence of item-infos) - rust-lang#91151 (Fix test in std::process on android) - rust-lang#91179 (Fix more <a> color) - rust-lang#91199 (rustdoc: Add test for mixing doc comments and attrs) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup

This is a functionally equivalent, minimally invasive backport of rust-lang#90044. backport-of: nothing

hkratz · 2021-11-25T13:46:41Z

Though, speaking of host tools guarantees: How did the original regression land if this issue blocks even linking a simple "Hello, world!"?

The host tools are linked against shared musl in CI, which works fine. This is only an issue with +crt-static, which is the default for the aarch64-unknown-linux-musl target.

workingjubilee · 2021-11-26T01:08:22Z

Oh, then the severity of this is somewhat reduced, as musl-based distros patch rustc's musl targets to default to -crt-static (a patch we will eventually take up, and to some degree this hammers home why we should).

Changelog: https://github.com/rust-lang/libc/releases/tag/0.2.107 https://github.com/rust-lang/libc/releases/tag/0.2.108 Primarily intended to pull in fd331f65f214ea75b6210b415b5fd8650be15c73 This should help with rust-lang#90044

Update libc to 0.2.108 Changelog: https://github.com/rust-lang/libc/releases/tag/0.2.107 https://github.com/rust-lang/libc/releases/tag/0.2.108 Primarily intended to pull in rust-lang/libc@fd331f6 This should help with rust-lang#90044

This is a functionally equivalent, minimally invasive backport of rust-lang#90044, which fixes the problem that compiling any binary with the target aarch64-unknown-linux-musl fails unless lld is used for linking (rust-lang#89626). I have tested this backport by building aarch64-unknown-linux-gnu, installing the std libraries for the -musl and -gnu variants in rustc-beta-aarch64-unknown-linux-gnu/rustc/lib/rustlib and running helloworld successfully for both targets on arm64 hardware.

…imulacrum [stable] 1.57.0 artifacts This is the standard beta->stable promotion, and includes a last-minute backports of: * rust-lang#90044 via inclusion of rust-lang#91220. * [beta] Don't treat unnormalized function arguments as well-formed rust-lang#91242 r? `@Mark-Simulacrum`

rust-highfive assigned oli-obk Oct 19, 2021

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 19, 2021

rust-highfive assigned workingjubilee and unassigned oli-obk Oct 19, 2021

tonyg mentioned this pull request Oct 20, 2021

aarch64 builds using nightly fail with missing getauxval in init_have_lse_atomics in cpu_model.c in compiler_builtins cross-rs/cross#598

Closed

apiraino added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Oct 28, 2021

rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Nov 4, 2021

workingjubilee mentioned this pull request Nov 5, 2021

Bump libc to 0.2.107 rust-lang/libc#2515

Merged

bors closed this in rust-lang/libc@cd5de2f Nov 7, 2021

workingjubilee reopened this Nov 8, 2021

workingjubilee mentioned this pull request Nov 8, 2021

Update libc to 0.2.108 #90681

Merged

Disable aarch64 outline atomics with musl for now.

bd287fa

The introduced dependency on `getauxval`causes linking problems with musl, see rust-lang#89626.

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 24, 2021

GuillaumeGomez mentioned this pull request Nov 24, 2021

Rollup of 8 pull requests #91198

Closed

This was referenced Nov 24, 2021

Rollup of 7 pull requests #91202

Closed

Rollup of 7 pull requests #91203

Merged

bors merged commit cbe563a into rust-lang:master Nov 25, 2021

rustbot added this to the 1.58.0 milestone Nov 25, 2021

hkratz added a commit to rusticstuff/rust that referenced this pull request Nov 25, 2021

Disable outline atomics to aarch64-unknown-linux-musl.

6f53f3b

This is a functionally equivalent, minimally invasive backport of rust-lang#90044. backport-of: nothing

hkratz mentioned this pull request Nov 25, 2021

[beta][1.57] Disable outline atomics for aarch64-unknown-linux-musl #91220

Closed

hkratz deleted the disable_arm_outline_atomics_for_musl branch November 25, 2021 19:54

Mark-Simulacrum mentioned this pull request Nov 29, 2021

[stable] 1.57.0 artifacts #91361

Merged

Mark-Simulacrum modified the milestones: 1.58.0, 1.57.0 Nov 29, 2021

Mark-Simulacrum added beta-accepted Accepted for backporting to the compiler in the beta channel. and removed beta-nominated Nominated for backporting to the compiler in the beta channel. labels Nov 29, 2021

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Restrict aarch64 outline atomics to glibc for now. #90044

Restrict aarch64 outline atomics to glibc for now. #90044

hkratz commented Oct 19, 2021 •

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workingjubilee commented Nov 26, 2021

Restrict aarch64 outline atomics to glibc for now. #90044

Restrict aarch64 outline atomics to glibc for now. #90044

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