[fpc-devel] OpenGL and glut bugs in Freepascal 2.1.1 runningwith Mac Os X Tiger ?

Adriaan van Os fpc at microbizz.nl
Thu Nov 3 10:48:47 CET 2005

Nexus wrote:

> <snip>
> An unhandled exception occurred at $903E68B8 :
> EInvalidOp : Invalid floating point operation
> <snip>
> So it first seems to be some error in the fpu code generation of the 
> compiler. But the strange things is, after running a C-Program which 
> uses glut and open gl everything just works fine. So maybe there is 
> something wrong in the open gl / glut initialization part or some 
> incompatibilities with Mac OS X 10.4
> <snip>

Just a guess - could this be the same problem as discussed in the 
"[fpc-devel] MacOSX: EXC_ARITHMETIC in PerformHIConversion" thread, 
where Jonas Maebe wrote:

>>>> Are these exceptions by default disabled by gcc ?
>>> The FPC runtime explicitly turns them on by default (since they are  
>>> required for detecting errors), while libc doesn't. It is 
>>> independent of the compiler used.
>> So, if I understand it correct, you wont get a aritmic exeption in 
>> FPC anymore when this is turned on ?
> The "invalid fpu operation" exceptions are turned on in the FPC system 
> unit initialisation code. If you add the code I posted, they are 
> turned off again and so you won't get them (not due to buggy code in 
> the Carbon framework and not anywhere else either).


Adriaan van Os

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