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From: "Rego, P." <pvrego@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Using dll from a C# code
Date: Wed, 29 Feb 2012 18:26:25 -0800 (PST)
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Date: 2012-02-29T18:26:25-08:00
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> You have to be sure you are using the compiler for .NET; I think
> there's something about qualifying names too, but I don't remember
> what. You may want to check out the import pragma on page 16 in this
> pdf: http://www.usafa.edu/df/dfe/dfer/centers/accr/docs/carlisle2006b.pdf

Quite interesting this paper. But I still could not import the function with success. Actually I changed the simple.cs to
// simple.cs
// compile with csc /t:library simple.cs
namespace Simple{
        public class VerifyClass{
                public static bool Verify(){
                return true;
        }
        }
}

So when I make gnatmake main -largs -lsimple, it returns me
gcc -c main.adb
gcc -c simple.ads
gnatbind -x main.ali
gnatlink main.ali -lsimple
.\main.o:main.adb:(.text+0x21): undefined reference to `Verify@0'
collect2: ld returned 1 exit status
gnatlink: error when calling C:\GNAT\2011\bin\gcc.exe
gnatmake: *** link failed.

I sense that the problem is a tiny mistake (but where?)