rust 1.95 pre-release windows-gnullvm: rust-size fails with missing libLLVM-22-rust-1.95.0-stable.dll when called via rustup proxy

[pbl-pw]

Problem Description
After upgrading to Rust 1.95.0 pre-release and using the x86_64-pc-windows-gnullvm toolchain, running rust-size (from the llvm-tools-preview component) fails with a system error:

The code execution cannot proceed because libLLVM-22-rust-1.95.0-stable.dll was not found.

Details
The DLL does exist in the toolchain's bin directory:
~.rustup\toolchains\stable-x86_64-pc-windows-gnullvm\bin\libLLVM-22-rust-1.95.0-stable.dll.
Running .\rust-size.exe directly inside the toolchain bin folder works.
Running rust-size from any other directory (via the rustup proxy in ~.cargo\bin) fails.

Environment Information
Rust Version: 1.95.0 (stable)

Toolchain Host: x86_64-pc-windows-gnullvm

OS: Windows 10

Rustup Version: 1.29

[Mark-Simulacrum]

This will ship on Thursday so we have a pretty small window for fixes if it is a regression (I haven't checked). Would be good to confirm:

• What other platforms are affected
• Is this a regression from 1.94? What previous release were you testing?
• Bisection to see if there's something easily revertible

[pbl-pw]

1.94 and 1.94.1 work fine. I'm just a Rust user and not familiar with its source code.

[ChrisDenton]

It looks like the dll need to be packaged in both bin directories? cc @mati865

[pbl-pw]

1.94.1-x86_64-pc-windows-gnullvm\lib\rustlib\x86_64-pc-windows-gnullvm\bin\llvm-size.exe is 5.36MB
1.95.0-x86_64-pc-windows-gnullvm\lib\rustlib\x86_64-pc-windows-gnullvm\bin\llvm-size.exe is 484kB
Maybe shared dll PATH not set

[mati865]

We can revert 1d1280a as the simplest solution for stable and and beta to have some time for fixing this properly. Regardless of the other solution this would be safest bet.

It looks like the dll need to be packaged in both bin directories? cc @mati865

At this point this would be third copy of that DLL. I don't remember what other component installs it, perhaps rustc-dev, and I'm afraid this would introduce a conflict between components.

I'll look into it today.

[jieyouxu]

Minimal reverts just in case:

• Stable: [stable] Revert "Build shared LLVM lib for windows-gnullvm" #155283
• Beta: [beta] Revert "Build shared LLVM lib for windows-gnullvm" #155285