[release/11.0-rc1] Fix crossgen2 rejecting input files with uppercase .DLL/.EXE extensions - #132894
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…ns (#132857) `crossgen2` rejected input assemblies whose on-disk extension is uppercase (`.DLL`/`.EXE`), which occurs on filesystems/network shares that normalize casing (e.g. WinFsp/virtiofs). This is a regression from `Microsoft.NETCore.App.Crossgen2` 10.0.5 → 10.0.9, breaking `PublishReadyToRun` builds on affected volumes. ## Root Cause `RunSingleCompilation` in `src/coreclr/tools/aot/crossgen2/Program.cs` matched `Path.GetExtension(inFilePath)` against `.dll`/`.exe` using a case-sensitive switch expression, throwing `CommandLineException` for any other casing. ## Fix - Replaced the switch expression with cascading `if`/`else if` statements comparing the extension via `StringComparison.OrdinalIgnoreCase`, so `.dll`, `.DLL`, `.Dll`, `.exe`, `.EXE`, etc. are all accepted. - Fixes #132554 --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: jtschuster <36744439+jtschuster@users.noreply.github.com>
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agocke
approved these changes
Aug 31, 2026
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/ba-g all failures known |
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Backport of #132857 to release/11.0-rc1
/cc @jtschuster @copilot
Customer Impact
Crossgen2 does not accept uppercase letters as the file extension for .dll and .exe files. On filesystems that always report uppercase file names, this makes it impossible to use the affected versions of crossgen2.
Regression
Likely #122947
Testing
Testing was validated with a local build of crossgen2.
Risk
Low. The change is small and targeted, and no existing tests have failed.
IMPORTANT: If this backport is for a servicing release, please verify that:
release/X.0-staging, notrelease/X.0.release/X.0(no-stagingsuffix).Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.
Keep in mind that we still need package authoring in .NET 8 and older versions.