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/*

        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.

// -DGC_OPERATOR_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.