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From: Gale Paeper
Subject: problems with GPC/Mac OS X
Date: 28 May 2003, 18:59:26

Frank Heckenbach wrote:
> 
> Boris Herman wrote:
> 
[snip]
> >
> > Thanks! That did it. I had to implement an arcsin function myself as
> > there isn't a "math" unit for GPC, right?

For a Pascal "math" unit for GPC on Mac OS X, Apple has already supplied
a solution in the fp.p unit of the Universal Interfaces. The comment
from fp.p [.pas] pretty much explains the functionality:

{*******************************************************************************
*                                                                       
       *
*    A collection of numerical functions designed to facilitate a wide  
       *
*    range of numerical programming as required by C9X.                 
       *
*                                                                       
       *
*    The <fp.h> declares many functions in support of numerical
programming.    *
*    It provides a superset of <math.h> and <SANE.h> functions.  Some   
       *
*    functionality previously found in <SANE.h> and not in the FPCE
<fp.h>      *
*    can be found in this <fp.h> under the heading "__NOEXTENSIONS__".  
       *
*                                                                       
       *
*    All of these functions are IEEE 754 aware and treat exceptions,
NaNs,      *
*    positive and negative zero and infinity consistent with the
floating-      *
*    point standard.                                                    
       *
*                                                                       
       *
*******************************************************************************}

Thanks to the efforts of  Adriaan van Os and Peter N Lewis, a Mac OS X
GPC compatible version of Apple's Universal Interfaces which includes
fp.pas is available in two download packages which installs the
GPCInterfaces (i.e., the GPC compatible translation of Apple's Universal
Interfaces) for use with Mac OS X GPC.  The Mac OS X GPC binary install
package <http://www.microbizz.nl/gpc321d11.bin.tar> includes
GPCInterfaces as part of the installation or a GPCInterfaces only
install package <http://www.microbizz.nl/GPCInterfacesA.tar> will add
the GPCInterfaces to a Mac OS X configuration if it doesn't already have
a copy installed.

 
> You could declare the libm function external.
> 
>   double asin (double x);

If I'm not mistaken, the gcc math.h for Mac OS X is configured to use
Apple's math.h.  Since the math.h subset of the GPCInterfaces fp.pas
ends up linking with Apple's math.h implementation, there isn't any need
to do this.  The original poster can get the asin implemetation on Mac
OS X just by using the fp.pas unit from GPCInterfaces.  Since fp.pas
contains a trunc function which is incompatible with Pascal's trunc
fuction, it would be less troublesome to either selectively import the
specificly need routines from fp.pas or to selectively rename the import
of the fp.pas trunc routine to avoid conflicts with Pascal's trunc function.

Gale Paeper
gpaeper@empirenet.com

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