[fpc-pascal] Problems with Dynlibs.UnloadLibrary on Linux

Andrew Brunner andrew.t.brunner at gmail.com
Tue Dec 16 13:58:30 CET 2008

I've been experiencing problems with SOs under Linux and am trying to
develop a "Plugin" system for my Server I'm porting to Lazarus.  I'm
confident can get these Plug-ins to Load and Operate just fine at
least in (Ubuntu).

I can't however, Unload them.  I want to be able to use the
DynLibs.UnloadLibrary to unload a library.  I can't because I keep
getting a Segmentation Fault and the Application Crashes just by
calling the Unload Library.

This problem makes using SOs/DLLs pointless because if one plugin is
unloaded and the main service application closes due to a crash, all
plugins running under that process will go down with it.

Here's my extensive thread so far.  I'm hoping to find a good solution
shortly as this is slowing me down.


Are there a few tricks involved in getting FPC to compile these SOs
properly?  The minute I include Classes in my project's uses I can't
Unload the library.  If I just have straight forewared simple data
types with no other uses I can get these to unload.  Do you have any

I'm using all the latest and greatest FPC and Lazarus sources from
subversion as of 2008.12.15.

Thanks for you input, if any,  Andy.

More information about the fpc-pascal mailing list