[fpc-pascal] Win64 release of FPC 2.6.2 missing

Jonas Maebe jonas.maebe at elis.ugent.be
Thu May 2 14:13:44 CEST 2013

On 02 May 2013, at 11:07, Graeme Geldenhuys wrote:

> On 2013-05-02 09:43, Jonas Maebe wrote:
>>> Lazarus and 64-bit FPC 2.6.0. I didn't want to read 10's of pages
>>> on how to setup a cross compiler etc.
>> You don't have to read anything, it works exactly the same as a
>> regular compiler. Lazarus nor the compiler cares at all about what
>> architecture the compiler binary is.
> I did initially try to use it with Lazarus IDE. I setup Lazarus IDE by
> pointing it to the cross-compiler, then tried to compile my project.  
> It
> failed - can't remember the error. In hindsight, it was probably  
> because
> I failed to specify a Target and OS platform in the "Project
> Options|Compiler Settings" - not sure.

Since the cross-compiler is the only official Win64 compiler we  
distribute, I'd assume more people would have problems with it if it  
wouldn't work out of the box with Lazarus.

>> The Mac OS X 64-bit compilers are also cross-compilers (although the
>> x86-64 binaries are actually a bit faster on Mac OS X, but it reduces
> Any thoughts on why it is slower on Linux and Windows then? It is  
> just a
> lack of compiler optimisation?

I don't know whether it's slower on Linux. In any case, a major  
difference between Mac OS X and the other platforms is the on Mac OS  
X, several performance-critical RTL routines are mapped to the system  
C library, whose routines are tuned specifically for the cpu of the  
current machine on Mac OS X (and which are in general probably also  
more optimised than the routines which we have in our RTL).  
Codegeneration-wise there is virtually no difference between Linux and  
Mac OS X on x86-64. Win64 uses a different ABI, but I don't know  
whether it is (much) less efficient.


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