[fpc-pascal] Connecting to a mariadb server from a Free Pascal Process using Devaun

[Michael Van Canneyt]

On Tue, 12 May 2026, Terry A. Haimann via fpc-pascal wrote:

> Ok, this all works from Linux Mint running where I am running Mariadb 10.11.14.  I ahave also ran this on newer versions of mint w/o issues.  But on True Blue Debian systems I haven't gotten it to work.
>
> Ok, yesterday I installed Devaun 6.12.86 on an old laptop (i5-2450m) and installed mariadb 11.8.6. According to the web that version is compatible with Mysql 8.0.  I created the database and table and added terry to the grant table.
>
> I then did a fresh compile and tried running it:
>
> fpc ImportCars.pas
> Free Pascal Compiler version 3.2.2+dfsg-46 [2025/02/08] for x86_64
> Copyright (c) 1993-2021 by Florian Klaempfl and others
> Target OS: Linux for x86-64
> Compiling ImportCars.pas
> Linking ImportCars
> 97 lines compiled, 0.3 sec
>
> ./ImportCars
> An unhandled exception occurred at $00000000004F54E9:
> EInOutError: Can not load default MySQL library ("libmysqlclient.so.21" or "libmysqlclient.so"). Check your installation.
>  $00000000004F54E9
>  $0000000000482FE5
>  $000000000047054D
>
> I tried then to install libmysqlclient-dev but according to apt-get that has been discontinued and replaced with either libmariadb-dev or libmariadb-dev-compat.  I tried both with the following results:
>
> sudo apt-get install libmariadb-dev
> ./ImportCars
> An unhandled exception occurred at $00000000004F54E9:
> EInOutError: Can not load default MySQL library ("libmysqlclient.so.21" or "libmysqlclient.so"). Check your installation.
>  $00000000004F54E9
>  $0000000000482FE5
>  $000000000047054D
>
> I then removed that library and installed the 2nd library.
>
> sudo apt-get remove libmariadb-dev
>
> sudo apt-get install libmariadb-dev-compat
>
> ./ImportCars
> An unhandled exception occurred at $0000000000483045:
> EInOutError: TMySQL80Connection can not work with the installed MySQL client version: Expected (8.0), got (3.4.9).
>  $0000000000483045
>  $000000000047054D

Set the SkipLibraryVersionCheck property to true, that should avoid this error.

Michael.