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Fix DllImport library names for case-sensitive filesystems #26415

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Merged
snnn merged 3 commits into from
Nov 4, 2025
Merged

Fix DllImport library names for case-sensitive filesystems #26415

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Copilot Oct 27, 2025
0167fa9
Specify explicit DLL extensions in DllImport to fix case-sensitive fi…
Copilot Oct 27, 2025
d042502
Update NativeMethods.shared.cs
Nov 4, 2025
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27 changes: 23 additions & 4 deletions csharp/src/Microsoft.ML.OnnxRuntime/NativeMethods.shared.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -866,13 +866,30 @@ static NativeMethods()
internal class NativeLib
{
#if __ANDROID__
// define the library name required for android
// Define the library name required for Android
internal const string DllName = "libonnxruntime.so";
#elif __IOS__
// define the library name required for iOS
// Define the library name required for iOS
internal const string DllName = "__Internal";
#else
internal const string DllName = "onnxruntime";
// For desktop platforms, explicitly specify the DLL name with extension to avoid
// issues on case-sensitive filesystems (including Windows with case-sensitivity enabled).
//
// Previous behavior relied on .NET automatically adding platform-specific extensions:
// Windows: onnxruntime -> onnxruntime.dll
// Linux: onnxruntime -> libonnxruntime.so
// macOS: onnxruntime -> libonnxruntime.dylib
//
// By specifying "onnxruntime.dll" explicitly, we ensure consistent behavior across
// case-sensitive and case-insensitive filesystems. This requires that native libraries
// for all platforms be named "onnxruntime.dll" in their respective runtime folders,
// or that appropriate symlinks/aliases be created during packaging.
//
// NuGet packages should contain:
// - runtimes/win-{arch}/native/onnxruntime.dll
// - runtimes/linux-{arch}/native/onnxruntime.dll (symlink to libonnxruntime.so)
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// - runtimes/osx-{arch}/native/onnxruntime.dll (symlink to libonnxruntime.dylib)
internal const string DllName = "onnxruntime.dll";
#endif
}

Expand Down Expand Up @@ -2951,7 +2968,9 @@ internal static class OrtExtensionsNativeMethods
#elif __IOS__
internal const string ExtensionsDllName = "__Internal";
#else
internal const string ExtensionsDllName = "ortextensions";
// For desktop platforms, explicitly specify the DLL name with extension to avoid
// issues on case-sensitive filesystems. See NativeLib.DllName for detailed explanation.
internal const string ExtensionsDllName = "ortextensions.dll";
#endif

[DllImport(ExtensionsDllName, CharSet = CharSet.Ansi,
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