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From: James Alan Farrell <anonymous@anonymous.com>
Newsgroups: comp.lang.ada
Subject: Strange error in mixed language program (incompatible libraries?)
Date: Mon, 09 Aug 2004 14:37:07 -0400
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Date: 2004-08-09T14:37:07-04:00
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Hello, all,
I'm working on a program that is partly in C and partly in Ada.  The
main program is in C, and links to several libraries whose source is
C, and one library whose source is Ada.

When the C libraries are actually linked, I get an error 
raised STORAGE_ERROR : stack overflow (or erroneous memory access)

This error is raised by one of the Ada routines BEFORE any of the C
library routines are called.

When the C library is not linked and the C calls are commented out the
Ada routines run correctly.  Unfortunately the program does not do
anything this way.  (Actually that's a good thing.  The unfortunate
thing is the specs say it HAS to so something ;)

The Ada code is compiled with gnat version 3.15

The C code is compiled with gcc version 2.8.1


This shows how the Ada code is typically compiled, so you can see what
flags, etc. we are using:

gcc -c -Wall -g -gnatf -I/usr/local/lib/stk/include -DAPICALL=
example.adb
gnatmake -c example.adb -cargs -Wall -g -gnatf
-I/usr/local/lib/stk/include -DAPICALL= 

where example.adb is a made up file name containing a package body
with a set of functions to be  loaded into the Ada library.  There is
a matching companion .ads file.  The each library function is declared
in the .ads file, and is accompanied with a pragma like

   pragma Export
     (C, My_Ada_Function_Name, "my_c_function_name");



The library is created with:

ar rs libada_interface.a b~ada_interface.o ada_interface.o example.o
... (a dozen or so files)

I've tried simple things like recompiling all Ada and C code, raising
the stack limit then recompiling everything, etc.  

Anyone know what might cause this and how it might be fixed?

Many thanks,
James Alan Farrell
GrammaTech.com