[fpc-devel] FPC shared lib called from C shared lib called from C main program crashes

[Jonas Maebe]

On 17 Sep 2009, at 17:28, Lukas Zeller wrote:

> Now Snow Leopard 10.6.1, but we have a parallel installation on  
> Leopard 10.5.latest that also shows the problem.

Note that on Mac OS X 10.6.x (or rather with Xcode 3.2, which ships  
with Mac OS X 10.6) there is a known linker bug that messes up FPC  
libraries. See http://bugs.freepascal.org/view.php?id=14471 for the  
details.

> Ok. I assume the RTL initialisation and the library initialisation  
> block are BOTH run as part of the system level shared lib  
> initialisation (DLL main entry point), in that order, correct?

It depends on the OS:
* on Mac OS X, the shared library entry point is called, which then  
calls the RTL initialisation routine before executing any code you may  
have added
* on Linux, some assembler RTL code is called that sets up various  
things, which in turn calls the library entry point and things proceed  
as on Mac OS X.

> I could. Actually it also happens without the in-between C shlib. A  
> C main with a FPC shlib is sufficient.
>
> I have a 10 lines sample program that shows the effect nicely. As a  
> FPC community newbie - where should I post the sample and the bug  
> report to? Not to this list, I assume...

The bug reporting form is at http://bugs.freepascal.org. You can post  
things to the mailing list, but if not immediately acted upon they  
tend to be forgotten. So using the website is always better.


Jonas