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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: calling Ada dll from C?
Date: Sat, 21 Mar 2015 04:43:49 -0500
Message-ID: <85d2428z3e.fsf@stephe-leake.org>
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Xref: news.eternal-september.org comp.lang.ada:25217
Date: 2015-03-21T04:43:49-05:00
List-Id: <comp.lang.ada>

I'm using an OpenToken parser with Emacs. In order to make it as fast as
possible, I'm trying to build the parser as a dynamically linked library
(.dll or .so); Emacs 25 will have the ability to load dlls at run time.

I can build the dll with a library project file:

   for Library_Name use "ada_wisi_module_parse";
   for Library_Dir use "lib";
   for Library_Kind use "dynamic";

However, when I try to load that dll into Emacs, it complains with "the
module cannot be found". Of course, it doesn't say _which_ module cannot
be found - sigh.

I get the same error on Windows 7 32 bit and Debian 64 bit. I'm
compiling with GNAT GPL 2014.

On Debian, ldd says all required libraries are found.


A related issue is 'adainit'. According to "(gnat_ugn) Binding with
Non-Ada Main Programs", since the main program is not in Ada, I'm
supposed to run gnatbind with -n, and then call 'adainit' from the C
main program.

However, since I'm only building a dll, not a main program, it appears
gnatbind is not run, so no 'adainit' is generated.


Has anyone build an Ada dll that can be called from C?

-- 
-- Stephe