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From: Gary Brumfield <g.brumfield@lmco.com>
Subject: Re: C interface - Apex/Verdix
Date: 1997/06/04
Message-ID: <3395DC9F.3A25@lmco.com>#1/1
X-Deja-AN: 246269458
References: <338ce5d2.87925678@news.mhv.net> <5mjb0u$dhi@newshub.atmnet.net>
To: Christopher Green <cgreen@yosemite.atc.com>
Organization: Lockheed Martin Federal Systems-COS
Newsgroups: comp.lang.ada
Date: 1997-06-04T00:00:00+00:00
List-Id: <comp.lang.ada>


Christopher Green wrote:
> 
> Apex for Ada 95 has pragma Import, which is portable.
> 
> (Language is a predefined package on VADS that provides the correct
> prefixes for external names; for example, on SunOS 4 hosts,
> Language.C_Subp_Prefix is the string "_".)
> 

I am coding in Ada95 (for the first time) using the Apex Ada 2.2.3A
compiler and need to interface with C/C++ code compiled using the Sun
compiler.  I am able to link a main Ada program with a C procedure using
the pragma Import but I have to supply the "mangled" C linker_name.  To
get this name I have to use the UNIX "nm" command on the object file. 
This seems dangerous if the C compiler ever decides to change the way
this "mangled" name is generated.  Do you know of a better way around
this?  My platform is Sun Solaris 2.5.1.  Can I use this VADS language
package and if so, where is it?

  NAME         MANGLED NAME
 ---------     ---------------
 c_routine     __0FJc_routinev


Notice that my "mangled" name also has a "v" suffix in addition to a
"__0FJ" prefix.

Also, do you know if Apex Ada will support a C++ main program
interfacing with Ada95?  This does work in GNAT when "adainit" and
"adafinal" are used.
-- 

Gary B.