[Experiment]: Test EII for `RawOsError` in `core` by bushrat011899 · Pull Request #158116 · rust-lang/rust

bushrat011899 · 2026-06-19T04:28:43Z

Objective

Checking with CI what kind of issues there may be with using EII for #155625. I'm expecting this to fail on Mac OS and Windows.

Notable Issues

No GCC support, and no way to tell at compile time if we're using the GCC backend to cfg it out.
core will always be marked as used even if it isn't actually in use because of the EII symbols.
Mac OS doesn't yet support defaults for EII. This prevents no_std from working on target_vendor = "apple".
Windows has partial support.
- MinGW fails to link in no_std, implying strong symbols work correctly. This affects all(windows, target_env = "gnu")
- MSVC seems to work, need to confirm the functions are actually being overridden.

Seem entirely unrelated to me

bjorn3 · 2026-06-19T07:54:42Z

They now fail because libcore implements an EII. Crates that implement an EII are never considered unused as removing them would affect which implementation is picked for an EII or even give an error if there ie no default. That check should probably be changed to ignore the default implementation of an EII.

View changes since the review

Ahhh ok. I'll update this bodge commit to note this an be a bit more surgical than just outright deleting the tests. Thanks!

Kobzol · 2026-06-19T10:02:53Z

@bors delegate=try

rust-bors · 2026-06-19T10:02:56Z

✌️ @bushrat011899, you can now perform try builds on this pull request!

You can now post @bors try to start a try build.

bushrat011899 · 2026-06-19T10:09:31Z

Thank you!

@bors try

[Experiment]: Test EII for `RawOsError` in `core`

mejrs · 2026-06-19T10:11:30Z

If you turn this into an actual PR can you also ensure eii+stability attributes work properly? I think the implementation supports this but I'm glancing at the test suite and don't see any tests for it.

bushrat011899 · 2026-06-19T10:14:42Z

If you turn this into an actual PR can you also ensure eii+stability attributes work properly? I think the implementation supports this but I'm glancing at the test suite and don't see any tests for it.

Noted! I suspect this won't be an actual PR for a while. Mac OS and Windows not working isn't too bad since I can fallback to an atomic pointer. But the GCC compatibility isn't something I know how to work around.

rust-bors · 2026-06-19T12:20:59Z

☀️ Try build successful (CI)
Build commit: 52ab23a (52ab23a65bcf328fb0c88e0a9c4446d8a7b254de)
Base parent: 8e15021 (8e150217bafcaaaa0c45bf685c55fd56cec48598)

bushrat011899 · 2026-06-19T12:22:37Z

Linux seems to build fine (as expected). Gonna try Windows now, which will probably fail pretty quickly.

@bors try jobs=dist-x86_64-msvc

[Experiment]: Test EII for `RawOsError` in `core` try-job: dist-x86_64-msvc

Kobzol · 2026-06-19T12:44:53Z

Just note that the dist- jobs generally don't run tests. If you want tests to run, you'll want e.g. x86_64-msvc-[1/2].

bushrat011899 · 2026-06-19T13:03:43Z

@bors try cancel

Thanks for the pointer! Still getting the hang of things.

@bors try jobs=x86_64-msvc-1,x86_64-msvc-2

rust-bors · 2026-06-19T13:03:46Z

Try build cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/27825439021

[Experiment]: Test EII for `RawOsError` in `core` try-job: x86_64-msvc-1 try-job: x86_64-msvc-2 try-job: aarch64-apple try-job: x86_64-mingw-1 try-job: x86_64-mingw-2

bushrat011899 · 2026-06-20T06:56:32Z

@bors try cancel
@bors try jobs=x86_64-msvc-1,x86_64-msvc-2,aarch64-apple,x86_64-mingw-1,x86_64-mingw-2

rust-bors · 2026-06-20T06:56:36Z

Try build cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/27861915040

[Experiment]: Test EII for `RawOsError` in `core` try-job: x86_64-msvc-1 try-job: x86_64-msvc-2 try-job: aarch64-apple try-job: x86_64-mingw-1 try-job: x86_64-mingw-2

rust-bors · 2026-06-20T10:02:06Z

☀️ Try build successful (CI)
Build commit: 44ae5f9 (44ae5f98c964e7b1b6d5fb3494e57a355ad7c805)
Base parent: 8c75e93 (8c75e93c5c7671c29f3e8c096b7acf56822ed23a)

bushrat011899 · 2026-06-20T12:17:47Z

Gonna try using linkage = "weak" directly for MinGW and Apple.

@bors try jobs=aarch64-apple,x86_64-mingw-1

[Experiment]: Test EII for `RawOsError` in `core` try-job: aarch64-apple try-job: x86_64-mingw-1

rust-bors · 2026-06-20T14:28:45Z

💔 Test for 5b208ea failed: CI. Failed jobs:

try - aarch64-apple (web logs, enhanced plaintext logs)
try - x86_64-mingw-1 (web logs, enhanced plaintext logs)

bushrat011899 · 2026-06-20T15:15:18Z

@bors try jobs=aarch64-apple,x86_64-mingw-1

rust-bors · 2026-06-20T15:15:21Z

@bushrat011899: 🔑 Insufficient privileges: not in try users

Kobzol · 2026-06-20T18:42:30Z

Sorry, all delegation was reset today due to some bors implementation changes 😅

@bors delegate try

rust-bors · 2026-06-20T18:42:33Z

✌️ @bushrat011899, you can now perform try builds on this pull request!

You can now post @bors try to start a try build.

bushrat011899 · 2026-06-20T20:30:31Z

All good, thanks for fixing it up! Was worried is hit some limit last night 😅

@bors try jobs=aarch64-apple,x86_64-mingw-1

[Experiment]: Test EII for `RawOsError` in `core` try-job: aarch64-apple try-job: x86_64-mingw-1

rust-log-analyzer · 2026-06-20T22:24:43Z

The job x86_64-mingw-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- [ui] tests\ui\eii\io_in_core_no_std.rs stdout ----

error: test compilation failed although it shouldn't!
status: exit code: 1
command: PATH="D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\bin;D:\a\rust\rust\build\x86_64-pc-windows-gnu\bootstrap-tools\x86_64-pc-windows-gnu\release\deps;D:\a\rust\rust\ninja;D:\a\rust\rust\mingw64\bin;C:\msys64\usr\bin;D:\a\rust\rust\sccache;C:\Program Files\MongoDB\Server\7.0\bin;C:\vcpkg;C:\tools\zstd;C:\hostedtoolcache\windows\stack\3.11.1\x64;C:\cabal\bin;C:\ghcup\bin;C:\mingw64\bin;C:\Program Files\dotnet;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Program Files\R\R-4.6.0\bin\x64;C:\SeleniumWebDrivers\GeckoDriver;C:\SeleniumWebDrivers\EdgeDriver;C:\SeleniumWebDrivers\ChromeDriver;C:\Program Files (x86)\sbt\bin;C:\Program Files (x86)\GitHub CLI;C:\Program Files\Git\bin;C:\Program Files (x86)\pipx_bin;C:\npm\prefix;C:\hostedtoolcache\windows\go\1.24.13\x64\bin;C:\hostedtoolcache\windows\Python\3.12.10\x64\Scripts;C:\hostedtoolcache\windows\Python\3.12.10\x64;C:\hostedtoolcache\windows\Ruby\3.3.11\x64\bin;C:\Program Files\OpenSSL\bin;C:\tools\kotlinc\bin;C:\hostedtoolcache\windows\Java_Temurin-Hotspot_jdk\17.0.19-10\x64\bin;C:\Program Files\ImageMagick-7.1.2-Q16-HDRI;C:\Program Files\Microsoft SDKs\Azure\CLI2\wbin;C:\ProgramData\kind;C:\ProgramData\Chocolatey\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Program Files\PowerShell\7;C:\Program Files\Microsoft\Web Platform Installer;C:\Program Files\Microsoft SQL Server\170\Tools\Binn;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn;C:\Program Files\dotnet;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files (x86)\WiX Toolset v3.14\bin;C:\Program Files\Microsoft SQL Server\130\DTS\Binn;C:\Program Files\Microsoft SQL Server\140\DTS\Binn;C:\Program Files\Microsoft SQL Server\150\DTS\Binn;C:\Program Files\Microsoft SQL Server\160\DTS\Binn;C:\Program Files\Microsoft SQL Server\170\DTS\Binn;C:\ProgramData\chocolatey\lib\pulumi\tools\Pulumi\bin;C:\Program Files\CMake\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\ProgramData\chocolatey\lib\maven\apache-maven-3.9.16\bin;C:\Program Files\Microsoft Service Fabric\bin\Fabric\Fabric.Code;C:\Program Files\Microsoft SDKs\Service Fabric\Tools\ServiceFabricLocalClusterManager;C:\Program Files\nodejs;C:\Program Files\Git\cmd;C:\Program Files\Git\mingw64\bin;C:\Program Files\Git\usr\bin;C:\Program Files\GitHub CLI;C:\tools\php;C:\Program Files (x86)\sbt\bin;C:\Program Files\Amazon\AWSCLIV2;C:\Program Files\Amazon\SessionManagerPlugin\bin;C:\Program Files\Amazon\AWSSAMCLI\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn;C:\Program Files\mongosh;C:\Program Files\LLVM\bin;C:\Program Files (x86)\LLVM\bin;C:\Users\runneradmin\.dotnet\tools;C:\Users\runneradmin\.cargo\bin;C:\Users\runneradmin\AppData\Local\Microsoft\WindowsApps" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2\\bin\\rustc.exe" "D:\\a\\rust\\rust\\tests\\ui\\eii\\io_in_core_no_std.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=C:\\Users\\runneradmin\\.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=D:\\a\\rust\\rust\\vendor" "--sysroot" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2" "--target=x86_64-pc-windows-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--out-dir" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\eii\\io_in_core_no_std" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "-Cpanic=abort"
stdout: none
--- stderr -------------------------------
error: linking with `x86_64-w64-mingw32-gcc` failed: exit code: 1
   |
   = note: "x86_64-w64-mingw32-gcc" "-Wl,D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\eii\\io_in_core_no_std\\rustcfJEWhh\\list.def" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-m64" "-Wl,--high-entropy-va" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\eii\\io_in_core_no_std\\rustcfJEWhh\\symbols.o" "<1 object files omitted>" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\eii\\io_in_core_no_std\\rustcfJEWhh\\rmeta.o" "-Wl,-Bstatic" "<sysroot>\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib/{libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-lmingwex" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "-o" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\eii\\io_in_core_no_std\\io_in_core_no_std.dll" "-shared" "-Wl,--out-implib=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\eii\\io_in_core_no_std\\libio_in_core_no_std.dll.a" "-Wl,--strip-debug" "-nodefaultlibs"
   = note: some arguments are omitted. use `--verbose` to show all linker arguments
   = note: D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_decode_error_kind: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_fmt: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_is_interrupted: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcd1): undefined reference to `__core_io_raw_os_error_is_interrupted'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdce1): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcf1): undefined reference to `__core_io_raw_os_error_fmt'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25e5f): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25eab): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           collect2.exe: error: ld returned 1 exit status
           
   = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
   = note: use the `-l` flag to specify native libraries to link

error: aborting due to 1 previous error
------------------------------------------

---- [ui] tests\ui\eii\io_in_core_no_std.rs stdout end ----
---- [ui] tests\ui\extern-flag\force-extern.rs stdout ----

error: auxiliary build of D:\a\rust\rust\tests\ui\extern-flag\auxiliary\panic_handler.rs failed to compile: 
status: exit code: 1
command: PATH="D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\bin;D:\a\rust\rust\build\x86_64-pc-windows-gnu\bootstrap-tools\x86_64-pc-windows-gnu\release\deps;D:\a\rust\rust\ninja;D:\a\rust\rust\mingw64\bin;C:\msys64\usr\bin;D:\a\rust\rust\sccache;C:\Program Files\MongoDB\Server\7.0\bin;C:\vcpkg;C:\tools\zstd;C:\hostedtoolcache\windows\stack\3.11.1\x64;C:\cabal\bin;C:\ghcup\bin;C:\mingw64\bin;C:\Program Files\dotnet;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Program Files\R\R-4.6.0\bin\x64;C:\SeleniumWebDrivers\GeckoDriver;C:\SeleniumWebDrivers\EdgeDriver;C:\SeleniumWebDrivers\ChromeDriver;C:\Program Files (x86)\sbt\bin;C:\Program Files (x86)\GitHub CLI;C:\Program Files\Git\bin;C:\Program Files (x86)\pipx_bin;C:\npm\prefix;C:\hostedtoolcache\windows\go\1.24.13\x64\bin;C:\hostedtoolcache\windows\Python\3.12.10\x64\Scripts;C:\hostedtoolcache\windows\Python\3.12.10\x64;C:\hostedtoolcache\windows\Ruby\3.3.11\x64\bin;C:\Program Files\OpenSSL\bin;C:\tools\kotlinc\bin;C:\hostedtoolcache\windows\Java_Temurin-Hotspot_jdk\17.0.19-10\x64\bin;C:\Program Files\ImageMagick-7.1.2-Q16-HDRI;C:\Program Files\Microsoft SDKs\Azure\CLI2\wbin;C:\ProgramData\kind;C:\ProgramData\Chocolatey\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Program Files\PowerShell\7;C:\Program Files\Microsoft\Web Platform Installer;C:\Program Files\Microsoft SQL Server\170\Tools\Binn;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn;C:\Program Files\dotnet;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files (x86)\WiX Toolset v3.14\bin;C:\Program Files\Microsoft SQL Server\130\DTS\Binn;C:\Program Files\Microsoft SQL Server\140\DTS\Binn;C:\Program Files\Microsoft SQL Server\150\DTS\Binn;C:\Program Files\Microsoft SQL Server\160\DTS\Binn;C:\Program Files\Microsoft SQL Server\170\DTS\Binn;C:\ProgramData\chocolatey\lib\pulumi\tools\Pulumi\bin;C:\Program Files\CMake\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\ProgramData\chocolatey\lib\maven\apache-maven-3.9.16\bin;C:\Program Files\Microsoft Service Fabric\bin\Fabric\Fabric.Code;C:\Program Files\Microsoft SDKs\Service Fabric\Tools\ServiceFabricLocalClusterManager;C:\Program Files\nodejs;C:\Program Files\Git\cmd;C:\Program Files\Git\mingw64\bin;C:\Program Files\Git\usr\bin;C:\Program Files\GitHub CLI;C:\tools\php;C:\Program Files (x86)\sbt\bin;C:\Program Files\Amazon\AWSCLIV2;C:\Program Files\Amazon\SessionManagerPlugin\bin;C:\Program Files\Amazon\AWSSAMCLI\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn;C:\Program Files\mongosh;C:\Program Files\LLVM\bin;C:\Program Files (x86)\LLVM\bin;C:\Users\runneradmin\.dotnet\tools;C:\Users\runneradmin\.cargo\bin;C:\Users\runneradmin\AppData\Local\Microsoft\WindowsApps" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2\\bin\\rustc.exe" "D:\\a\\rust\\rust\\tests\\ui\\extern-flag\\auxiliary\\panic_handler.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=C:\\Users\\runneradmin\\.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=D:\\a\\rust\\rust\\vendor" "--sysroot" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2" "--target=x86_64-pc-windows-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "--out-dir" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "--crate-type" "dylib" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary"
stdout: none
--- stderr -------------------------------
error: linking with `x86_64-w64-mingw32-gcc` failed: exit code: 1
   |
   = note: "x86_64-w64-mingw32-gcc" "-Wl,D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary\\rustcfSVCDc\\list.def" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-m64" "-Wl,--high-entropy-va" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary\\rustcfSVCDc\\symbols.o" "<1 object files omitted>" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary\\rustcfSVCDc\\rmeta.o" "-Wl,-Bstatic" "<sysroot>\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib/{libunwind-*,liblibc-*,librustc_std_workspace_core-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-lmingwex" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary" "-o" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary\\panic_handler.dll" "-shared" "-Wl,--out-implib=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\force-extern\\auxiliary\\libpanic_handler.dll.a" "-Wl,--strip-debug" "-nodefaultlibs"
   = note: some arguments are omitted. use `--verbose` to show all linker arguments
   = note: D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_decode_error_kind: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_fmt: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_is_interrupted: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcd1): undefined reference to `__core_io_raw_os_error_is_interrupted'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdce1): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcf1): undefined reference to `__core_io_raw_os_error_fmt'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25e5f): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25eab): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           collect2.exe: error: ld returned 1 exit status
           
   = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
   = note: use the `-l` flag to specify native libraries to link

error: aborting due to 1 previous error
------------------------------------------

---- [ui] tests\ui\extern-flag\force-extern.rs stdout end ----
---- [ui] tests\ui\extern-flag\no-force-extern.rs stdout ----

error: auxiliary build of D:\a\rust\rust\tests\ui\extern-flag\auxiliary\panic_handler.rs failed to compile: 
status: exit code: 1
command: PATH="D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\bin;D:\a\rust\rust\build\x86_64-pc-windows-gnu\bootstrap-tools\x86_64-pc-windows-gnu\release\deps;D:\a\rust\rust\ninja;D:\a\rust\rust\mingw64\bin;C:\msys64\usr\bin;D:\a\rust\rust\sccache;C:\Program Files\MongoDB\Server\7.0\bin;C:\vcpkg;C:\tools\zstd;C:\hostedtoolcache\windows\stack\3.11.1\x64;C:\cabal\bin;C:\ghcup\bin;C:\mingw64\bin;C:\Program Files\dotnet;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Program Files\R\R-4.6.0\bin\x64;C:\SeleniumWebDrivers\GeckoDriver;C:\SeleniumWebDrivers\EdgeDriver;C:\SeleniumWebDrivers\ChromeDriver;C:\Program Files (x86)\sbt\bin;C:\Program Files (x86)\GitHub CLI;C:\Program Files\Git\bin;C:\Program Files (x86)\pipx_bin;C:\npm\prefix;C:\hostedtoolcache\windows\go\1.24.13\x64\bin;C:\hostedtoolcache\windows\Python\3.12.10\x64\Scripts;C:\hostedtoolcache\windows\Python\3.12.10\x64;C:\hostedtoolcache\windows\Ruby\3.3.11\x64\bin;C:\Program Files\OpenSSL\bin;C:\tools\kotlinc\bin;C:\hostedtoolcache\windows\Java_Temurin-Hotspot_jdk\17.0.19-10\x64\bin;C:\Program Files\ImageMagick-7.1.2-Q16-HDRI;C:\Program Files\Microsoft SDKs\Azure\CLI2\wbin;C:\ProgramData\kind;C:\ProgramData\Chocolatey\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Program Files\PowerShell\7;C:\Program Files\Microsoft\Web Platform Installer;C:\Program Files\Microsoft SQL Server\170\Tools\Binn;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn;C:\Program Files\dotnet;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files (x86)\WiX Toolset v3.14\bin;C:\Program Files\Microsoft SQL Server\130\DTS\Binn;C:\Program Files\Microsoft SQL Server\140\DTS\Binn;C:\Program Files\Microsoft SQL Server\150\DTS\Binn;C:\Program Files\Microsoft SQL Server\160\DTS\Binn;C:\Program Files\Microsoft SQL Server\170\DTS\Binn;C:\ProgramData\chocolatey\lib\pulumi\tools\Pulumi\bin;C:\Program Files\CMake\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\ProgramData\chocolatey\lib\maven\apache-maven-3.9.16\bin;C:\Program Files\Microsoft Service Fabric\bin\Fabric\Fabric.Code;C:\Program Files\Microsoft SDKs\Service Fabric\Tools\ServiceFabricLocalClusterManager;C:\Program Files\nodejs;C:\Program Files\Git\cmd;C:\Program Files\Git\mingw64\bin;C:\Program Files\Git\usr\bin;C:\Program Files\GitHub CLI;C:\tools\php;C:\Program Files (x86)\sbt\bin;C:\Program Files\Amazon\AWSCLIV2;C:\Program Files\Amazon\SessionManagerPlugin\bin;C:\Program Files\Amazon\AWSSAMCLI\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn;C:\Program Files\mongosh;C:\Program Files\LLVM\bin;C:\Program Files (x86)\LLVM\bin;C:\Users\runneradmin\.dotnet\tools;C:\Users\runneradmin\.cargo\bin;C:\Users\runneradmin\AppData\Local\Microsoft\WindowsApps" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2\\bin\\rustc.exe" "D:\\a\\rust\\rust\\tests\\ui\\extern-flag\\auxiliary\\panic_handler.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=C:\\Users\\runneradmin\\.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=D:\\a\\rust\\rust\\vendor" "--sysroot" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2" "--target=x86_64-pc-windows-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "--out-dir" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "--crate-type" "dylib" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary"
stdout: none
--- stderr -------------------------------
error: linking with `x86_64-w64-mingw32-gcc` failed: exit code: 1
   |
   = note: "x86_64-w64-mingw32-gcc" "-Wl,D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary\\rustcLifHaP\\list.def" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-m64" "-Wl,--high-entropy-va" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary\\rustcLifHaP\\symbols.o" "<1 object files omitted>" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary\\rustcLifHaP\\rmeta.o" "-Wl,-Bstatic" "<sysroot>\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib/{libunwind-*,liblibc-*,librustc_std_workspace_core-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-lmingwex" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary" "-o" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary\\panic_handler.dll" "-shared" "-Wl,--out-implib=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\no-force-extern\\auxiliary\\libpanic_handler.dll.a" "-Wl,--strip-debug" "-nodefaultlibs"
   = note: some arguments are omitted. use `--verbose` to show all linker arguments
   = note: D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_decode_error_kind: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_fmt: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_is_interrupted: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcd1): undefined reference to `__core_io_raw_os_error_is_interrupted'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdce1): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcf1): undefined reference to `__core_io_raw_os_error_fmt'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25e5f): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25eab): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           collect2.exe: error: ld returned 1 exit status
           
   = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
   = note: use the `-l` flag to specify native libraries to link

error: aborting due to 1 previous error
------------------------------------------

---- [ui] tests\ui\extern-flag\no-force-extern.rs stdout end ----
---- [ui] tests\ui\extern-flag\redundant-force-extern.rs stdout ----

error: auxiliary build of D:\a\rust\rust\tests\ui\extern-flag\auxiliary\panic_handler.rs failed to compile: 
status: exit code: 1
command: PATH="D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\bin;D:\a\rust\rust\build\x86_64-pc-windows-gnu\bootstrap-tools\x86_64-pc-windows-gnu\release\deps;D:\a\rust\rust\ninja;D:\a\rust\rust\mingw64\bin;C:\msys64\usr\bin;D:\a\rust\rust\sccache;C:\Program Files\MongoDB\Server\7.0\bin;C:\vcpkg;C:\tools\zstd;C:\hostedtoolcache\windows\stack\3.11.1\x64;C:\cabal\bin;C:\ghcup\bin;C:\mingw64\bin;C:\Program Files\dotnet;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Program Files\R\R-4.6.0\bin\x64;C:\SeleniumWebDrivers\GeckoDriver;C:\SeleniumWebDrivers\EdgeDriver;C:\SeleniumWebDrivers\ChromeDriver;C:\Program Files (x86)\sbt\bin;C:\Program Files (x86)\GitHub CLI;C:\Program Files\Git\bin;C:\Program Files (x86)\pipx_bin;C:\npm\prefix;C:\hostedtoolcache\windows\go\1.24.13\x64\bin;C:\hostedtoolcache\windows\Python\3.12.10\x64\Scripts;C:\hostedtoolcache\windows\Python\3.12.10\x64;C:\hostedtoolcache\windows\Ruby\3.3.11\x64\bin;C:\Program Files\OpenSSL\bin;C:\tools\kotlinc\bin;C:\hostedtoolcache\windows\Java_Temurin-Hotspot_jdk\17.0.19-10\x64\bin;C:\Program Files\ImageMagick-7.1.2-Q16-HDRI;C:\Program Files\Microsoft SDKs\Azure\CLI2\wbin;C:\ProgramData\kind;C:\ProgramData\Chocolatey\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Program Files\PowerShell\7;C:\Program Files\Microsoft\Web Platform Installer;C:\Program Files\Microsoft SQL Server\170\Tools\Binn;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn;C:\Program Files\dotnet;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files (x86)\WiX Toolset v3.14\bin;C:\Program Files\Microsoft SQL Server\130\DTS\Binn;C:\Program Files\Microsoft SQL Server\140\DTS\Binn;C:\Program Files\Microsoft SQL Server\150\DTS\Binn;C:\Program Files\Microsoft SQL Server\160\DTS\Binn;C:\Program Files\Microsoft SQL Server\170\DTS\Binn;C:\ProgramData\chocolatey\lib\pulumi\tools\Pulumi\bin;C:\Program Files\CMake\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\ProgramData\chocolatey\lib\maven\apache-maven-3.9.16\bin;C:\Program Files\Microsoft Service Fabric\bin\Fabric\Fabric.Code;C:\Program Files\Microsoft SDKs\Service Fabric\Tools\ServiceFabricLocalClusterManager;C:\Program Files\nodejs;C:\Program Files\Git\cmd;C:\Program Files\Git\mingw64\bin;C:\Program Files\Git\usr\bin;C:\Program Files\GitHub CLI;C:\tools\php;C:\Program Files (x86)\sbt\bin;C:\Program Files\Amazon\AWSCLIV2;C:\Program Files\Amazon\SessionManagerPlugin\bin;C:\Program Files\Amazon\AWSSAMCLI\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn;C:\Program Files\mongosh;C:\Program Files\LLVM\bin;C:\Program Files (x86)\LLVM\bin;C:\Users\runneradmin\.dotnet\tools;C:\Users\runneradmin\.cargo\bin;C:\Users\runneradmin\AppData\Local\Microsoft\WindowsApps" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2\\bin\\rustc.exe" "D:\\a\\rust\\rust\\tests\\ui\\extern-flag\\auxiliary\\panic_handler.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=C:\\Users\\runneradmin\\.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=D:\\a\\rust\\rust\\vendor" "--sysroot" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2" "--target=x86_64-pc-windows-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "--out-dir" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "--crate-type" "dylib" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary"
stdout: none
--- stderr -------------------------------
error: linking with `x86_64-w64-mingw32-gcc` failed: exit code: 1
   |
   = note: "x86_64-w64-mingw32-gcc" "-Wl,D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary\\rustc3RwfA0\\list.def" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-m64" "-Wl,--high-entropy-va" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary\\rustc3RwfA0\\symbols.o" "<1 object files omitted>" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary\\rustc3RwfA0\\rmeta.o" "-Wl,-Bstatic" "<sysroot>\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib/{libunwind-*,liblibc-*,librustc_std_workspace_core-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-lmingwex" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary" "-o" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary\\panic_handler.dll" "-shared" "-Wl,--out-implib=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\extern-flag\\redundant-force-extern\\auxiliary\\libpanic_handler.dll.a" "-Wl,--strip-debug" "-nodefaultlibs"
   = note: some arguments are omitted. use `--verbose` to show all linker arguments
   = note: D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_decode_error_kind: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_fmt: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot export __core_io_raw_os_error_is_interrupted: symbol not defined
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcd1): undefined reference to `__core_io_raw_os_error_is_interrupted'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdce1): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcf1): undefined reference to `__core_io_raw_os_error_fmt'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25e5f): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25eab): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           collect2.exe: error: ld returned 1 exit status
           
   = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
   = note: use the `-l` flag to specify native libraries to link

error: aborting due to 1 previous error
------------------------------------------

---- [ui] tests\ui\extern-flag\redundant-force-extern.rs stdout end ----
---- [ui] tests\ui\no_std\simple-runs.rs stdout ----

error: test compilation failed although it shouldn't!
status: exit code: 1
command: PATH="D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\bin;D:\a\rust\rust\build\x86_64-pc-windows-gnu\bootstrap-tools\x86_64-pc-windows-gnu\release\deps;D:\a\rust\rust\ninja;D:\a\rust\rust\mingw64\bin;C:\msys64\usr\bin;D:\a\rust\rust\sccache;C:\Program Files\MongoDB\Server\7.0\bin;C:\vcpkg;C:\tools\zstd;C:\hostedtoolcache\windows\stack\3.11.1\x64;C:\cabal\bin;C:\ghcup\bin;C:\mingw64\bin;C:\Program Files\dotnet;C:\Program Files\MySQL\MySQL Server 8.0\bin;C:\Program Files\R\R-4.6.0\bin\x64;C:\SeleniumWebDrivers\GeckoDriver;C:\SeleniumWebDrivers\EdgeDriver;C:\SeleniumWebDrivers\ChromeDriver;C:\Program Files (x86)\sbt\bin;C:\Program Files (x86)\GitHub CLI;C:\Program Files\Git\bin;C:\Program Files (x86)\pipx_bin;C:\npm\prefix;C:\hostedtoolcache\windows\go\1.24.13\x64\bin;C:\hostedtoolcache\windows\Python\3.12.10\x64\Scripts;C:\hostedtoolcache\windows\Python\3.12.10\x64;C:\hostedtoolcache\windows\Ruby\3.3.11\x64\bin;C:\Program Files\OpenSSL\bin;C:\tools\kotlinc\bin;C:\hostedtoolcache\windows\Java_Temurin-Hotspot_jdk\17.0.19-10\x64\bin;C:\Program Files\ImageMagick-7.1.2-Q16-HDRI;C:\Program Files\Microsoft SDKs\Azure\CLI2\wbin;C:\ProgramData\kind;C:\ProgramData\Chocolatey\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Program Files\PowerShell\7;C:\Program Files\Microsoft\Web Platform Installer;C:\Program Files\Microsoft SQL Server\170\Tools\Binn;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn;C:\Program Files\dotnet;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit;C:\Program Files (x86)\WiX Toolset v3.14\bin;C:\Program Files\Microsoft SQL Server\130\DTS\Binn;C:\Program Files\Microsoft SQL Server\140\DTS\Binn;C:\Program Files\Microsoft SQL Server\150\DTS\Binn;C:\Program Files\Microsoft SQL Server\160\DTS\Binn;C:\Program Files\Microsoft SQL Server\170\DTS\Binn;C:\ProgramData\chocolatey\lib\pulumi\tools\Pulumi\bin;C:\Program Files\CMake\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\ProgramData\chocolatey\lib\maven\apache-maven-3.9.16\bin;C:\Program Files\Microsoft Service Fabric\bin\Fabric\Fabric.Code;C:\Program Files\Microsoft SDKs\Service Fabric\Tools\ServiceFabricLocalClusterManager;C:\Program Files\nodejs;C:\Program Files\Git\cmd;C:\Program Files\Git\mingw64\bin;C:\Program Files\Git\usr\bin;C:\Program Files\GitHub CLI;C:\tools\php;C:\Program Files (x86)\sbt\bin;C:\Program Files\Amazon\AWSCLIV2;C:\Program Files\Amazon\SessionManagerPlugin\bin;C:\Program Files\Amazon\AWSSAMCLI\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn;C:\Program Files\mongosh;C:\Program Files\LLVM\bin;C:\Program Files (x86)\LLVM\bin;C:\Users\runneradmin\.dotnet\tools;C:\Users\runneradmin\.cargo\bin;C:\Users\runneradmin\AppData\Local\Microsoft\WindowsApps" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2\\bin\\rustc.exe" "D:\\a\\rust\\rust\\tests\\ui\\no_std\\simple-runs.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=C:\\Users\\runneradmin\\.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=D:\\a\\rust\\rust\\vendor" "--sysroot" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2" "--target=x86_64-pc-windows-gnu" "--check-cfg" "cfg(test,FALSE)" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\no_std\\simple-runs\\a.exe" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "-Cpanic=abort"
stdout: none
--- stderr -------------------------------
error: linking with `x86_64-w64-mingw32-gcc` failed: exit code: 1
   |
   = note: "x86_64-w64-mingw32-gcc" "-fno-use-linker-plugin" "-Wl,--dynamicbase" "-Wl,--disable-auto-image-base" "-m64" "-Wl,--high-entropy-va" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\no_std\\simple-runs\\rustcZHcqV4\\symbols.o" "<1 object files omitted>" "-Wl,-Bstatic" "<sysroot>\\lib\\rustlib\\x86_64-pc-windows-gnu\\lib/{libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_eh" "-l:libpthread.a" "-lmsvcrt" "-lmingwex" "-lmingw32" "-lgcc" "-lmsvcrt" "-lmingwex" "-luser32" "-lkernel32" "-Wl,--nxcompat" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\native\\rust-test-helpers" "-o" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\ui\\no_std\\simple-runs\\a.exe" "-Wl,--gc-sections" "-Wl,-O1" "-Wl,--strip-debug" "-nodefaultlibs"
   = note: some arguments are omitted. use `--verbose` to show all linker arguments
   = note: D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcd1): undefined reference to `__core_io_raw_os_error_is_interrupted'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdce1): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0xdcf1): undefined reference to `__core_io_raw_os_error_fmt'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25e5f): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           D:/a/rust/rust/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\x86_64-pc-windows-gnu\lib\libcore-1eb25e207c22de7e.rlib(core-1eb25e207c22de7e.core.c964aa0142d980c-cgu.0.rcgu.o):core.c964aa0142d980c-cgu.0:(.text+0x25eab): undefined reference to `__core_io_raw_os_error_decode_error_kind'
           collect2.exe: error: ld returned 1 exit status
           
   = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
   = note: use the `-l` flag to specify native libraries to link

error: aborting due to 1 previous error
---

Some tests failed in compiletest suite=ui mode=ui host=x86_64-pc-windows-gnu target=x86_64-pc-windows-gnu
Bootstrap failed while executing `test --stage 2 --skip=compiler --skip=src`
Build completed unsuccessfully in 1:46:07
make: *** [Makefile:126: ci-mingw-x] Error 1
  local time: Sat Jun 20 22:24:27 CUT 2026
  network time: Sat, 20 Jun 2026 22:24:27 GMT
##[error]Process completed with exit code 2.
##[group]Run echo "disk usage:"
echo "disk usage:"

rust-bors · 2026-06-20T22:30:49Z

💔 Test for 9a73571 failed: CI. Failed jobs:

try - aarch64-apple (web logs, enhanced plaintext logs)
try - x86_64-mingw-1 (web logs, enhanced plaintext logs)

[Experiment]: Test EII for RawOsError in core

f31e466

rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jun 19, 2026