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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT Project Manager and DLLs
Date: Tue, 19 Feb 2008 21:16:09 +0000
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The only differences I can see between a library of mine that does
create init/final symbols and yours (which don't here, Mac OS X/GNAT
GPL 2007) are that I have specified Library_Interface and
Library_Src_Dir. Doesn't seem enough.

After a bit of cross-platform hacking your 'make run' says

   cd pluginlib && ../bin/plug_sample


   Using the locator to load the plugin...
      Name            => sampleplug

   raised AW_PLUG.LOCATORS.PLUGIN_NOT_FOUND : sampleplug

which I take it is the problem!