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From: md4mars@mdstud.chalmers.se (Martin Klang)
Subject: linking with C++
Date: 1998/04/20
Message-ID: <6hglkj$dlh$1@nyheter.chalmers.se>#1/1
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Organization: Chalmers University of Technology
Newsgroups: comp.lang.ada
Date: 1998-04-20T00:00:00+00:00
List-Id: <comp.lang.ada>


lately i've been trying out ADA, and even though it's not by a long way as
esthetically pleasing as C++, i must confess it's a pretty useful little
language.

my problem (one of many, though the only one i'll cumber you with):

i cannot link to C++ with gnatlink.

even compiling the exact same code with g++ instead of gcc will produce an 
error with gnatlink, which claims the referenced function is undefined.

this is what happens:

//file cstuff.c
#include <stdio.h>
void c_test()
{
  printf("jah!");
}
//file cstuff.c

which i compile with:
>gcc -c cstuff.c -o c.o
>g++ -c cstuff.c -o cc.o

//file test.adb
procedure Test is
   procedure C_Test;
   pragma Import(CPP,C_Test,"c_test");
begin
   C_Test;
end Tester;        
//file test.adb

now, if i do:
>gnatmake test -largs c.o
it works, but if i do:
>gnatmake test -largs cc.o
it fails to link.

it seems to have no importance in this example whether i use pragma C or CPP
(what is the difference anyhow?)

comparing c.o and cc.o yields that g++ somewhere along the line renamned the
c_test-function to c_test__Fv. Why???

any help much appreciated,
martin


  "Disobedience is the true foundation of liberty.
   The obedient must be slaves."

--Henry David Thoreau, 1847