[Mono-dev] DllMap default architecture for P/Invoke

Jason Curl jcurlnews at arcor.de
Sat Jan 16 13:08:36 UTC 2016


I've created a DLL compiled for linux x86-64 and mapping this using 
P/Invoke. I'd like to know how a [DllImport("mylib")] can be instructed 
to look for the architecture specific library, and if not found, then a 
default (probably locally compiled) library for testing.

What I've done until now:

I've created an assembly configuration as per 
http://www.mono-project.com/docs/advanced/pinvoke/dllmap/ that looks like:

<?xml version="1.0" encoding="utf-8">
   <dllmap dll="libnserial" os="linux" cpu="x86-64" 
target="libnserial.Linux.x86_64.so.1" />
   <dllmap dll="libnserial" target="libnserial.so" />

The DLL import is:
public static extern IntPtr serial_version();

The final distribution for the application is expected to have (notice, 
no libnserial.so)

=> The configuration with Mono 4.2.1 fails with 
System.DllNotFoundException: libnserial.so

I remove the second dllmap and it works as expected. But in case the 
user builds themselves for local testing and usage, they'll get for 
their current architecture an additional library, where I want the 
second line to be a fallback in case the library can't be found.
libnserial.so -> libnserial.so.1
libnserial.so.1 -> libnserial.so.1.0

How would I handle this scenario within Mono?


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