error on calls to ABIs that cannot be called #142597

folkertdev · 2025-06-16T20:10:01Z

We recently added extern "custom", which cannot be called using a rust call expression. But there are more ABIs that can't be called in that way, because the call does not semantically make sense.

More details are in #140566 (comment)

r? @workingjubilee

try-job: x86_64-gnu-llvm-19-3

rustbot · 2025-06-16T20:10:06Z

workingjubilee is currently at their maximum review capacity.
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compiler/rustc_abi/src/extern_abi.rs

compiler/rustc_hir_typeck/src/callee.rs

compiler/rustc_abi/src/extern_abi.rs

workingjubilee

I think we would both like a slightly less annoying rebase, depending on which PR lands first (probably yours, tbh).

workingjubilee · 2025-06-17T22:56:09Z

tests/ui/abi/unsupported.rs

+extern "riscv-interrupt-s" fn riscv_s() {}
+//[x64,x64_win,i686,arm,aarch64]~^ ERROR is not a supported ABI
+fn riscv_s_ptr(f: extern "riscv-interrupt-s" fn()) {
+    //[x64,x64_win,i686,arm,aarch64]~^ WARN unsupported_fn_ptr_calling_conventions
+    //[x64,x64_win,i686,arm,aarch64]~^^ WARN this was previously accepted
+    f()
+    //[riscv32,riscv64]~^ ERROR functions with the `"riscv-interrupt-s"` ABI cannot be called
+}
+extern "riscv-interrupt-s" {}
+//[x64,x64_win,i686,arm,aarch64]~^ ERROR is not a supported ABI


this sure is getting to be an exciting test file

the alternative is to split it up per-target, which has upsides and downsides.

workingjubilee · 2025-06-17T23:02:10Z

tests/ui/abi/unsupported.rs

in the interest of minimizing (not eliminating, only minimizing) conflicts with a number of other in-flight PRs touching this file, can you duplicate (yes, duplicate as in add-a-new-file-with, not first-remove-here-and-then-add-a-new-file-with) the parts of the test for interrupt ABIs that you want to edit? then revert the change to this file that aren't going-to-happen-anyway?

include a FIXME that the duplication is intentional in the new file and that in the near future the duplication should be reduced (preferably by splitting up unsupported.rs a bit more but it really doesn't matter).

I split this out, and really there is less overlap than it seems: when using revisions, this is just kind of what you get. Any changes to the error messages will prompt to look at the duplication again.

compiler/rustc_hir_typeck/messages.ftl

folkertdev · 2025-06-18T11:02:16Z

@rustbot ready

workingjubilee · 2025-06-20T02:46:14Z

@bors r+

Only affects unstable API
@bors rollup

bors · 2025-06-20T02:46:16Z

📌 Commit 54970a8 has been approved by workingjubilee

It is now in the queue for this repository.

…=workingjubilee error on calls to ABIs that cannot be called We recently added `extern "custom"`, which cannot be called using a rust call expression. But there are more ABIs that can't be called in that way, because the call does not semantically make sense. More details are in rust-lang#140566 (comment) r? `@workingjubilee`

Rollup of 8 pull requests Successful merges: - #138291 (rewrite `optimize` attribute to use new attribute parsing infrastructure) - #140920 (Extract some shared code from codegen backend target feature handling) - #141990 (Implement send_signal for unix child processes) - #142597 (error on calls to ABIs that cannot be called) - #142668 (vec_deque/fmt/vec tests: remove static mut) - #142687 (Reduce uses of `hir_crate`.) - #142699 (Update books) - #142714 (add comment to `src/bootstrap/build.rs`) r? `@ghost` `@rustbot` modify labels: rollup

tgross35 · 2025-06-20T06:48:25Z

Well, this is doing its job #142762 (comment)

@bors r-

folkertdev · 2025-06-20T08:17:57Z

A casualty of CI now running on aarch64. This test could just use minicore though I think? I'll fix that later today.

https://github.com/rust-lang/rust/blob/master/tests/codegen/naked-asan.rs

tgross35 · 2025-06-20T08:22:43Z

@bors2 delegate=try

rust-bors · 2025-06-20T08:22:46Z

@folkertdev can now perform try builds on this pull request

folkertdev · 2025-06-20T17:09:33Z

@bors2 try=x86_64-gnu-llvm-19-3

rust-bors · 2025-06-20T17:09:36Z

Unknown command "try".

folkertdev · 2025-06-20T17:10:11Z

@bors2 try

error on calls to ABIs that cannot be called We recently added `extern "custom"`, which cannot be called using a rust call expression. But there are more ABIs that can't be called in that way, because the call does not semantically make sense. More details are in #140566 (comment) r? `@workingjubilee` try-job: x86_64-gnu-llvm-19-3

rust-bors · 2025-06-20T17:10:16Z

⌛ Trying commit a32d085 with merge 8c73581…

To cancel the try build, run the command @bors2 try cancel.

tgross35 · 2025-06-20T17:16:08Z

@bors2 try=x86_64-gnu-llvm-19-3

For reference it’s bors2 try jobs=…

rust-bors · 2025-06-20T19:07:19Z

☀️ Try build successful (CI)
Build commit: 8c73581 (8c73581ec29d2c5dd590ad546ef66e0434b83c33, parent: 9c4ff566babe632af5e30281a822d1ae9972873b)

folkertdev · 2025-06-20T19:08:38Z

@rustbot ready

tgross35 · 2025-06-20T19:15:27Z

@bors r=workingjubilee rollup=maybe

bors · 2025-06-20T19:15:30Z

📌 Commit a32d085 has been approved by workingjubilee

It is now in the queue for this repository.

rustbot assigned workingjubilee Jun 16, 2025

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jun 16, 2025

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tgross35 mentioned this pull request Jun 20, 2025

Rollup of 8 pull requests #142762

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error on calls to ABIs that cannot be called

a32d085

folkertdev force-pushed the abi-cannot-be-called branch from 54970a8 to a32d085 Compare June 20, 2025 17:09

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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-review Status: Awaiting review from the assignee but also interested parties. labels Jun 20, 2025

error on calls to ABIs that cannot be called #142597

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error on calls to ABIs that cannot be called #142597

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