[Mono-dev] dlopen(libSystem.Data.dll, 9): image not found (Mono-devel-list Digest, Vol 143, Issue 1)

[Jo Shields]

On 01/03/17 18:56, Robert Jordan wrote:
> On 01.03.2017 15:54, Jonathan Mitchell wrote:
>> While fixing a Dll import issue on MacOS I noticed the following:
>>
>> Mono: DllImport error loading library 'libSystem.Data.dll.so':
>> 'dlopen(libSystem.Data.dll.so, 9): image not found'.
>> Mono: DllImport error loading library 'libSystem.Data.dll.bundle':
>> 'dlopen(libSystem.Data.dll.bundle, 9): image not found'.
>> Mono: DllImport error loading library 'libSystem.Data.dll':
>> 'dlopen(libSystem.Data.dll, 9): image not found'.
>> Mono: DllImport unable to load library 'dlopen(libSystem.Data.dll, 9):
>> image not found'.
>> Mono: DllImport attempting to load: 'System.Data.dll.
>>
>> By the time my app launches  dlopen() has attempted to load
>> libSystem.Data.dll.whatever 1600 times.
>> My MacOS app launches and exceutes okay.
>>
>> Is this normal behaviour on 4.8.0?
> 
> It happens on 4.6.x as well, and it seems to be caused by actual
> DllImports of 'System.Data.dll':
> 
> 
> 
> $ monodis System.Data.dll | grep pinvoke | grep System
> 
> .method assembly static hidebysig pinvokeimpl ("System.Data.dll" as
> "DllBidTraceCW" unicode cdecl )
>     .method assembly static hidebysig pinvokeimpl ("System.Data.dll" as
> "DllBidTraceCW" unicode cdecl )
> ...
> 
> 
> These look to me like some MS Reference Source artifacts. Maybe
> there is a native System.Data.dll under MS.NET which is providing
> these exports :) No idea what it is.
> 
> See also
> 
> https://referencesource.microsoft.com/#System.Data/System/Data/Common/System.Data_BID.cs

mergebin? Can you p/invoke a merged managed-unmanaged assembly, to
access the unmanaged code within?