missing libstdc++-6.dll in beta-x86_64-pc-windows-gnu (1.41.0-beta.1)

[cuviper]

I saw this failure in rayon CI: https://ci.appveyor.com/project/cuviper/rayon/builds/29634901/job/y7h1kc7w9wsusl8r

info: syncing channel updates for 'beta-x86_64-pc-windows-gnu'
info: latest update on 2019-12-18, rust version 1.41.0-beta.1 (eb3f7c2d3 2019-12-17)
[...]
  beta installed - (error reading rustc version)


Rust is installed now. Great!

To get started you need Cargo's bin directory (%USERPROFILE%.cargo\bin) in your
PATH
environment variable. Future applications will automatically have the
correct environment, but you may need to restart your current shell.
set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
rustc -Vv
Command exited with code -1073741515

I'm on Linux, but I tried this build under Wine:

005b:err:module:import_dll Library libstdc++-6.dll (which is needed by L"Z:\\home\\jistone\\.rustup\\toolchains\\beta-x86_64-pc-windows-gnu\\bin\\rustc_driver-2602f879d4c5def3.dll") not found
005b:err:module:import_dll Library rustc_driver-2602f879d4c5def3.dll (which is needed by L"Z:\\home\\jistone\\.rustup\\toolchains\\beta-x86_64-pc-windows-gnu\\bin\\rustc.exe") not found
005b:err:module:LdrInitializeThunk Importing dlls for L"Z:\\home\\jistone\\.rustup\\toolchains\\beta-x86_64-pc-windows-gnu\\bin\\rustc.exe" failed, status c0000135

It seems @mati865's intention in #65911 was that this should be statically linked, but that was clobbered by #67077 in src/bootstrap/compile.rs at least.

The same error occurs on 1.41.0-nightly (3ed3b8bb7 2019-12-17) (via Wine again for me).

[mati865]

Probably the culprit is here: https://github.com/rust-lang/rust/pull/67077/files#r359557571

[mati865]

As immediate workaround I suggest adding libstdc++-6.dll to the PATH, it should be installed on most of the Windows CI.

[tan-wei]

@mati865 Thanks! It works.

[pnkfelix]

triage: P-high, has PR, removing nomination.

[binarycrusader]

As immediate workaround I suggest adding libstdc++-6.dll to the PATH, it should be installed on most of the Windows CI.

Sadly, that didn't work for me:

"The procedure entry point _ZNSt13__future_base12_Result_baseC2Ev could not be located in the dynamic link library C:\Users\xxx\.rustup\toolchains\nightly-x86_64-pc-windows-gnu\bin\rustc_driver-3aaebb9b017b7498.dll."

Just posting as an FYI, not expecting a solution.