Portable Object Compiler (c) 1997,98.  All Rights Reserved.


This file contains some notes that are specific to running "objc"
(pronounced as "Object Compiler") on the Macintosh using the
MPW environment.

STARTUP
-------

	You will need to set the directory where you installed the
	ObjectiveC MPW tools.

	I have a UserStartup.stes file (where '.' stands for a bullet)
	in stes:System Folder:Preferences:MPW.  It contains the following
	lines :
	
		set OBJCDIR stes:ObjectiveC
		export OBJCDIR
	
		set COMMANDS "{COMMANDS},{OBJCDIR}:bin:"
		export COMMANDS

	The driver is configured for "MWCPCC" (as CC) and the "MWLinkPPC" tool
	as linker.
	
	It's possible to compile objc output with MrC, but the MrC -e option
	doesn't seem to preprocess Objective-C.

Script Driver
-------------

	Since release 1.9.5, we also have a driver using the MPW script
	language (before we used to use the binary driver).
	
	Since this new driver is more convenient that the older driver
	(which was basically the Windows driver with some modfs), the new
	MPW script driver is the default.

	This means that the 'objc' program is a script that you can edit.

Binary Driver
-------------

	The binary, compiled, version can still be used.
	(it is, and probably will continue to be, also more up to date
	with the Windows versions, since the code is shared)
	
	This driver simply outputs commands to be evaluated by the MPW
	shell (on UNIX, this is the -check option).

YACC & LEX
----------

	The parser C sources are generated on UNIX, not on the Macintosh.

Makefiles
---------

	They are separate from the UNIX/WATCOM makefiles : Makefile.MPW
	

Header Files
------------

I've found code like this in Mac headers :

           extern pascal void SetClientID(short id);
           extern OSStatus RegistryEntryIDInit(RegEntryID *id);
           extern OSStatus RegistryEntryIDDispose(RegEntryID *id);
           extern OSStatus RegistryEntryDelete(const RegEntryID *id);

and worked around it by editing (replacing 'id' by 'ide')
the headers in question ...  It's occuring in a couple of headers :
Collections.h, ImageCompression.h, Movies.h, NameRegistry.h and
QuickTimeComponents.h and on one location in Quickdraw.h.

(Acceptable) ideas for a compiler-solution to this problem are
welcome ...


Libraries
---------

[This is probably CW/11 specific]

For building mpwtools, use the -mpwtool option.  This will MSL libraries.
For building sioux apps, use -sioux.  Will also use MSL libraries.

Now, for building a regular app, use -appl *AND USE DIFFERENT HEADER FILES*.
This is not really Objective-C specific, but it turns out that you have
to set MWCIncludes to "CIncludes" to be able to link against the non-MSL
libs (the MSL libs were compiled with MWCIncludes).

Also note that a known bug in the MSL MPW libs is that some symbols are missing.
Notably __getcreator() and __getfiletype().  You have to add the file unix.mac.c(located in the source of the runtime) to the library yourself.  If you haven't
already done (since this is not Objective-C specific).

