/*

MacOS_config.h

Configuration flags for Macintosh development systems.

<Revision History>

11/16/95 pcb Updated compilation flags to reflect latest 4.6 Makefile.

by Patrick C. Beard.

*/

/* Boehm, November 17, 1995 12:10 pm PST */

#ifdef __MWERKS__

// for CodeWarrior Pro with Metrowerks Standard Library (MSL).

// #define MSL_USE_PRECOMPILED_HEADERS 0

#include <ansi_prefix.mac.h>

#ifndef __STDC__

#define __STDC__ 0

#endif

#endif /* __MWERKS__ */

// these are defined again in gc_priv.h.

#undef TRUE

#undef FALSE

#define ALL_INTERIOR_POINTERS // follows interior pointers.

#define SILENT // no collection messages.

//#define DONT_ADD_BYTE_AT_END // no padding.

//#define SMALL_CONFIG // whether to use a smaller heap.

#define NO_SIGNALS // signals aren't real on the Macintosh.

#define USE_TEMPORARY_MEMORY // use Macintosh temporary memory.

// CFLAGS= -O -DNO_SIGNALS -DSILENT -DALL_INTERIOR_POINTERS

//

//LIBGC_CFLAGS= -O -DNO_SIGNALS -DSILENT \

// -DREDIRECT_MALLOC=GC_malloc_uncollectable \

// -DDONT_ADD_BYTE_AT_END -DALL_INTERIOR_POINTERS

// Flags for building libgc.a -- the last two are required.

//

// Setjmp_test may yield overly optimistic results when compiled

// without optimization.

// -DSILENT disables statistics printing, and improves performance.

// -DCHECKSUMS reports on erroneously clear dirty bits, and unexpectedly

// altered stubborn objects, at substantial performance cost.

// Use only for incremental collector debugging.

// -DFIND_LEAK causes the collector to assume that all inaccessible

// objects should have been explicitly deallocated, and reports exceptions.

// Finalization and the test program are not usable in this mode.

// -DSOLARIS_THREADS enables support for Solaris (thr_) threads.

// (Clients should also define SOLARIS_THREADS and then include

// gc.h before performing thr_ or GC_ operations.)

// This is broken on nonSPARC machines.

// -DALL_INTERIOR_POINTERS allows all pointers to the interior

// of objects to be recognized. (See gc_priv.h for consequences.)

// -DSMALL_CONFIG tries to tune the collector for small heap sizes,

// usually causing it to use less space in such situations.

// Incremental collection no longer works in this case.

// -DLARGE_CONFIG tunes the collector for unusually large heaps.

// Necessary for heaps larger than about 500 MB on most machines.

// Recommended for heaps larger than about 64 MB.

// -DDONT_ADD_BYTE_AT_END is meaningful only with

// -DALL_INTERIOR_POINTERS. Normally -DALL_INTERIOR_POINTERS

// causes all objects to be padded so that pointers just past the end of

// an object can be recognized. This can be expensive. (The padding

// is normally more than one byte due to alignment constraints.)

// -DDONT_ADD_BYTE_AT_END disables the padding.

// -DNO_SIGNALS does not disable signals during critical parts of

// the GC process. This is no less correct than many malloc

// implementations, and it sometimes has a significant performance

// impact. However, it is dangerous for many not-quite-ANSI C

// programs that call things like printf in asynchronous signal handlers.

// -DOPERATOR_NEW_ARRAY declares that the C++ compiler supports the

// new syntax "operator new[]" for allocating and deleting arrays.

// See gc_cpp.h for details. No effect on the C part of the collector.

// This is defined implicitly in a few environments.

// -DREDIRECT_MALLOC=X causes malloc, realloc, and free to be defined

// as aliases for X, GC_realloc, and GC_free, respectively.

// Calloc is redefined in terms of the new malloc. X should

// be either GC_malloc or GC_malloc_uncollectable.

// The former is occasionally useful for working around leaks in code

// you don't want to (or can't) look at. It may not work for

// existing code, but it often does. Neither works on all platforms,

// since some ports use malloc or calloc to obtain system memory.

// (Probably works for UNIX, and win32.)

// -DNO_DEBUG removes GC_dump and the debugging routines it calls.

// Reduces code size slightly at the expense of debuggability.