Re: Linking an ADA routine to a program written in C

[kilgallen@eisner.decus.org (Larry Kilgallen)]

Given the fact that you mention gcc, I suppose we might guess that
your Ada compiler is GNAT.

I just can't figure out how we will guess what type of computer you
are using.  Based on your comments about right-to-left and left-to-right,
I would tend to say Macintosh, but I know a reasonable amount about
Macintosh and have never heard the term "ELF-32".

Try writing a problem report like you were the person reading it.
Those Ada people are sticklers for clarity.

Larry Kilgallen

In article <51p2vu$enf@lal.interserv.com>, newmans@ncr.disa.mil writes:
> 
> I desperately need an explanation of how to link a routine written and compiled in ADA into a program
> written in C.  For example, I built an ada  test procedure hello.a and compiled it using the ada compiler.
> The object file produced was called hello01.  This program uses TEST_IO package to do the output.
> 
> Since the object module hello01 is ELF-32 bit I linked it in with my C objects using gcc.  But of course,
> I get undefined symbols because I have no idea how to tell gcc about the TEST_IO package.  
> 
> Does anyone know how this can be done.  
> 
> Also, some people have mentioned that I may have to use a PRAGMA in my C code to tell the
> compiler that the  routine I am calling  i.e. "hello"  is not a C subroutine.  C passes arguments from
> right to left.  I believe ADA probably passes them like PASCAL from left to right.  In C you can declare
> a routine to be type pascal to change the calling sequence to match PASCAL's.  If anyone has
> any experience calling ADA routines from C please contact me ASAP. 
> 
> 		Thank you!