rolfbjarne
commented
9 months ago I can reproduce. Complete test project: sample-8e39058.zip
I've found a couple of workarounds, which may or may not work in a bigger project:
- Add
-dlsym:falseto the MtouchExtraArgs. This won't work if you have DllImports to functions that don't exist. -
Set _ExportSymbolsExplicitly=false in the project file (this may increase the app size, but should otherwise work):
<PropertyGroup> <_ExportSymbolsExplicitly>false</_ExportSymbolsExplicitly> </PropertyGroup>
najak3d
ryancheung
This is a followup to https://github.com/xamarin/xamarin-macios/issues/19599. We've migrated to using NativeLibrary.SetDllImportResolver; however, this results in "EntryPointNotFound" unless the function is statically referenced elsewhere.
In legacy Xamarin, using the "Do not strip native debugging symbols." and -force_load flags would preserve all the entry points but it appears that no longer works as expected.
Steps to Reproduce
Create a DllImport which is rewritten, example:
[DllImport("RemapMe", EntryPoint = "SDL_SetHint", CallingConvention = CallingConvention.Cdecl)] private static extern unsafe SDL_bool Internal_SDL_SetHint( byte name, byte value );
NativeLibrary.SetDllImportResolver(assembly, MapAndLoad);
private static IntPtr MapAndLoad( string libraryName, Assembly assembly, DllImportSearchPath? dllImportSearchPath ) { return NativeLibrary.GetMainProgramHandle(); }
(A sample .cs and library are attached.)
Expected Behavior
Native function can be invoked.
Actual Behavior
Native function fails with "EntryPointNotFound" exception.
In the associated test file, we see: Hello world! Assembly is TestProj, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null Attempting to call SDL_SetHint using DllImportResolver with Internal... Received request to map UseInternal TestProj, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null AssemblyDirectory... Rewriting to Internal Received request to map UseInternal TestProj, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null AssemblyDirectory... Rewriting to __Internal System.DllNotFoundException: UseInternal at Program.Main(String[] args) in /Users/miles/Projects/TestProj/Main.cs:line 40 Attempting to call SDL_SetHint using DllImportResolver with GetProgramHandle... Received request to map UseProgramHandle TestProj, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null AssemblyDirectory... Rewriting using MainProgramHandle System.EntryPointNotFoundException: SDL_SetHint at Program.Main(String[] args) in /Users/miles/Projects/TestProj/Main.cs:line 52 Test complete.
Workaround
If the entry point is directly referenced elsewhere in the project, i.e.,
then the remapped calls will function correctly, but any remapped calls to other entry points will still fail.
Environment
net8.0-ios. This worked fine with .dll.config files in legacy Xamarin.
sample.zip