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Optimization.h
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2001-07-23
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/*
** Apple Macintosh Developer Technical Support
**
** DirectoryCopy: #defines that let you make MoreFiles code more efficient.
**
** by Jim Luther, Apple Developer Technical Support Emeritus
**
** File: Optimization.h
**
** Copyright ゥ 1992-1998 Apple Computer, Inc.
** All rights reserved.
**
** You may incorporate this sample code into your applications without
** restriction, though the sample code has been provided "AS IS" and the
** responsibility for its operation is 100% yours. However, what you are
** not permitted to do is to redistribute the source as "DSC Sample Code"
** after having made changes. If you're going to re-distribute the source,
** we require that you make it clear in the source that the code was
** descended from Apple Sample Code, but that you've made changes.
**
** The Optimization changes to MoreFiles source and header files, along with
** this file and OptimizationEnd.h, let you optimize the code produced
** by MoreFiles in several ways.
**
** 1 -- MoreFiles contains extra code so that many routines can run under
** Mac OS systems back to System 6. If your program requires a specific
** version of Mac OS and your program checks for that version before
** calling MoreFiles routines, then you can remove a lot of compatibility
** code by defining one of the following to 1:
**
** __MACOSSEVENFIVEONEORLATER // assume Mac OS 7.5.1 or later
** __MACOSSEVENFIVEORLATER // assume Mac OS 7.5 or later
** __MACOSSEVENORLATER // assume Mac OS 7.0 or later
**
** By default, all compatibility code is ON.
**
** 2 -- You may disable Pascal calling conventions in all MoreFiles routines
** except for system callbacks that require Pascal calling conventions.
** This will make C programs both smaller and faster.
** Just define __WANTPASCALELIMINATION to be 1 to turn this optimization on
** when building MoreFiles for use from C programs (you'll need to keep
** Pascal calling conventions when linking MoreFiles routines with Pascal
** programs).
**
** 3 -- If Metrowerks compiler is used, "#pragma internal on" may help produce
** better code. However, this option can also cause problems if you're
** trying to build MoreFiles as a shared library, so it is by default not used.
** Just define __USEPRAGMAINTERNAL to be 1 to turn this optimization on.
**
** Original changes supplied by Fabrizio Oddone
**
** File: Optimization.h
*/
#ifndef __MACOSSEVENFIVEONEORLATER
#define __MACOSSEVENFIVEONEORLATER 0
#endif
#ifndef __MACOSSEVENFIVEORLATER
#define __MACOSSEVENFIVEORLATER __MACOSSEVENFIVEONEORLATER
#endif
#ifndef __MACOSSEVENORLATER
#if GENERATINGCFM
#define __MACOSSEVENORLATER 1
#else
#define __MACOSSEVENORLATER __MACOSSEVENFIVEORLATER
#endif
#endif
#ifndef __WANTPASCALELIMINATION
#define __WANTPASCALELIMINATION 0
#endif
#if __WANTPASCALELIMINATION
#define pascal
#endif
#ifndef __USEPRAGMAINTERNAL
#define __USEPRAGMAINTERNAL 0
#endif
#if __USEPRAGMAINTERNAL
#if defined(__MWERKS__)
#pragma internal on
#endif
#endif