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Newsgroups: comp.lang.ada
Subject: Re: Ada and MySQL (mysql_library_init)
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From: Stephen Leake <stephen_leake@stephe-leake.org>
Date: Sun, 06 Dec 2009 10:59:35 -0500
Message-ID: <uvdgkm6u0.fsf@stephe-leake.org>
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Date: 2009-12-06T10:59:35-05:00
List-Id: <comp.lang.ada>

Tomek Walkuski <tomek.walkuski@gmail.com> writes:

> Hi,
>
> when interacting with MySQL database I should invoke mysql_library_init
> () function first. GNADE does not have it implemented so I tried to do
> this on my own:
>
>       function mysql_library_init (
>          argc     : int;
>          argv     : chars_ptr;
>          groups   : chars_ptr
>       ) return int;
>       pragma Import (C, mysql_library_init, "mysql_library_init");
>
> used as:
>      ... := mysql_library_init (0, Null_Ptr, Null_Ptr);
>
> I build my program with -I/usr/include/mysql -L/usr/lib64/mysql -
> lmysqlcient and get:
>      undefined reference to `mysql_library_init'
>      collect2: ld returned 1 exit status
>      gnatlink: error when calling /usr/bin/gcc
>      gnatmake: *** link failed.
>
> I tested my build setting with mysql_init() and mysql_close() and it
> is fine, I cannot get mysql_library_init() and mysql_library_end
> working.
>
> Simple C application with these functions works.
>
> Any ideas?

Are you building GNADE from scratch? It contains many imports similar
to yours, so it's hard to see why yours would fail but those succeed.

On the other hand, I recently updated the Debian package for GNADE,
and discovered that the MySQL code is severly broken; the Ada types
that are supposed to duplicate C types don't; the C types have
changed.

-- 
-- Stephe