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Newsgroups: comp.lang.ada
Date: Sat, 28 Apr 2018 12:07:05 -0700 (PDT)
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Subject: Help Linking Shared Objects for Library Use
From: patrick@spellingbeewinnars.org
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Xref: reader02.eternal-september.org comp.lang.ada:51763
Date: 2018-04-28T12:07:05-07:00
List-Id: <comp.lang.ada>


Hi Everyone

I am trying a new approach(for me) in terms of mixing C and Ada. I want to compile C object code and install system wide in my /usr/local/

I have this program:

with cow ;

procedure barn is
x : integer ;
begin
x := cow.moo ;
end barn ;


It "withs" this program:

package cow is

function  moo  return integer;
pragma import (C, moo, "moo") ;

end cow ;

This Ada library code should call this C code:

#include "sounds.h"
#include <stdio.h>

int moo(){
 printf("cow says moooo\n") ;
return 0;
}


Which also has a header:

int moo(void) ;


I have a little build.sh script which is run to build the shared object from the C code:

gcc -c -Wall -Werror -fpic sounds.c
sudo cp sounds.h /usr/local/include
sudo gcc -shared sounds.o  -o /usr/local/lib/libsounds.so

If I run at the command line, I get this error:

gnatmake barn.adb -lsounds
gcc-4.6 -c -lsounds barn.adb
gcc-4.6 -c -lsounds cow.ads
gnatbind -x barn.ali
gnatlink barn.ali
./barn.o: In function `_ada_barn':
barn.adb:(.text+0x9): undefined reference to `moo'
collect2: ld returned 1 exit status
gnatlink: error when calling /usr/bin/gcc-4.6
gnatmake: *** link failed.
 

When I look at the Ada library code installed from my repo it has .ali files but I don't think I am generating cow.ali

Is there a step I am missing to build cow.ads properly? or am I doing something else wrong?

Thanks for reading-Patrick