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    <p>I can't help with the Perl side (you require 5.14, Mac OS X has 5.12, Debian 6 has 5.10). That said, I can help with building the library for a C main and direct linking ...</p> <p>The GNAT build process is sufficiently complicated that there are two tools to support it, <code>gnatmake</code> and <code>gprbuild</code>. It’s likely (writing at September 2015) that <code>gnatmake</code> will lose the ability to build libraries, so <code>gprbuild</code> is the better option.</p> <p>I think you need a <i>stand-alone library project</i> (that is, one with the initialization and finalization operations that control Ada elaboration; if you don't initialize the Ada library, you'll get SEGVs or other bad behaviours). You'll find the lowdown on building one <a href="http://docs.adacore.com/live/wave/gprbuild/html/gprbuild_ug/gprbuild_ug/gnat_project_manager.html#stand-alone-library-projects" rel="nofollow noreferrer">here</a>.</p> <p>The <code>greeter.gpr</code> I wrote is</p> <pre><code>project Greeter is for Library_Name use "greeter"; for Library_Kind use "relocatable"; for Library_Dir use "lib"; for Library_Interface use ("greeter"); for Library_Auto_Init use "true"; -- the default, I think for Object_Dir use ".build"; -- to keep temp objects out of the way end Greeter; </code></pre> <p>The <code>Library_Name</code> attribute controls the name of the library; <code>libgreeter.dylib</code> on Mac OS X, <code>libgreeter.so</code> on Linux.</p> <p>The <code>Library_Kind</code> attribute could alternatively be <code>"static"</code>, in which case the name would be <code>libgreeter.a</code>. However, <em>stand-alone libraries must be relocatable</em>.</p> <p>The <code>Library_Dir</code> attribute, which you have to supply (with the two above) to make a library at all, controls where the library is created; in this case, in <code>lib/</code>.</p> <p>You have to supply the <code>Library_Interface</code> attribute to make it a stand-alone library and generate the initialization and finalization operations that control Ada elaboration. They're called <i>library_name</i><code>init</code> and <i>library_name</i><code>final</code> - here, <code>greeterinit</code>, <code>greeterfinal</code>.</p> <p>If <code>Library_Auto_Init</code> is <code>"false"</code> you have to call the initialization and finalization operations yourself, if <code>"true"</code>, they're managed automagically.</p> <p>OK, build the library by</p> <pre><code>gprbuild -p -P greeter </code></pre> <p>(<code>-p</code> says "create any needed output directories", <code>-P</code> specifies the project file).</p> <p>I built <code>greeter.c</code></p> <pre><code>#include &lt;stdio.h&gt; extern void greeter_hello(); int main() { greeter__hello(); return 0; } </code></pre> <p>using</p> <pre><code>$ gcc greeter.c -o greeter -L lib -l greeter </code></pre> <p>and run (on Linux) using</p> <pre><code>$ LD_LIBRARY_PATH=./lib ./greeter </code></pre>
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    1. COSimon Wright++, this has given me some good stuff to get started with. I'll try that out and if it works, will accept this answer.
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    2. COI've not yet had the tuits to try this, but in the mean time I've accepted the answer because it seems the more promising of the two so far.
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