Building DLL with GNAT to be used with non-Ada application on Windows : some doubts

["Jérôme Haguet" <j.haguet@cadwin.com>]

Hello 

My configuration : GNAT GPL 2011 / Windows 7

Some years ago, I had built a DLL with gnat.
As it was supposed to be used with non-Ada application, I had to export and call an initialization routine.
As detailed in §G.11 Gnat UG.
This was done with a simple makefile, calling gnatmake then gnatdll.

This process is still working with Gnat GPL 2011.

Now, I am trying to do the same with a gpr file.
I am able to build a DLL to be used with Ada application (in this case using GNAT shared runtime)
As detailed in $G.10 in Gnat UG.
But I am not able to build a DLL exporting its own initialization routine.
When building the library, the linker fails with following message: 
my_ada_lib.o:my_ada_lib.adb:(.text+0x77): undefined reference to `adainit'
my_ada_lib.o:my_ada_lib.adb:(.text+0x87): undefined reference to `adafinal'

Is it possible or not ? 
If yes, what is the setting I have omitted ? 

My gpr : 

library project my_ada_lib is

   for Languages use ("Ada");

   for Library_Name use "my_ada_lib";
   for Library_Kind use "dynamic";

   for Source_Dirs use (".");
   for Object_Dir   use "obj";
   for Library_Dir  use "..";

end my_ada_lib;