libgc/Mac_files/MacOS_config.h

   1 /*
   2         MacOS_config.h
   3
   4         Configuration flags for Macintosh development systems.
   5
   6         <Revision History>
   7
   8         11/16/95  pcb  Updated compilation flags to reflect latest 4.6 Makefile.
   9
  10         by Patrick C. Beard.
  11  */
  12 /* Boehm, November 17, 1995 12:10 pm PST */
  13
  14 #ifdef __MWERKS__
  15
  16 // for CodeWarrior Pro with Metrowerks Standard Library (MSL).
  17 // #define MSL_USE_PRECOMPILED_HEADERS 0
  18 #include <ansi_prefix.mac.h>
  19 #ifndef __STDC__
  20 #define __STDC__ 0
  21 #endif
  22
  23 #endif /* __MWERKS__ */
  24
  25 // these are defined again in gc_priv.h.
  26 #undef TRUE
  27 #undef FALSE
  28
  29 #define ALL_INTERIOR_POINTERS   // follows interior pointers.
  30 #define SILENT                  // no collection messages.
  31 //#define DONT_ADD_BYTE_AT_END  // no padding.
  32 //#define SMALL_CONFIG          // whether to use a smaller heap.
  33 #define NO_SIGNALS              // signals aren't real on the Macintosh.
  34 #define USE_TEMPORARY_MEMORY    // use Macintosh temporary memory.
  35
  36 // CFLAGS= -O -DNO_SIGNALS -DSILENT -DALL_INTERIOR_POINTERS
  37 //
  38 //LIBGC_CFLAGS= -O -DNO_SIGNALS -DSILENT \
  39 //    -DREDIRECT_MALLOC=GC_malloc_uncollectable \
  40 //    -DDONT_ADD_BYTE_AT_END -DALL_INTERIOR_POINTERS
  41 //   Flags for building libgc.a -- the last two are required.
  42 //
  43 // Setjmp_test may yield overly optimistic results when compiled
  44 // without optimization.
  45 // -DSILENT disables statistics printing, and improves performance.
  46 // -DCHECKSUMS reports on erroneously clear dirty bits, and unexpectedly
  47 //   altered stubborn objects, at substantial performance cost.
  48 //   Use only for incremental collector debugging.
  49 // -DFIND_LEAK causes the collector to assume that all inaccessible
  50 //   objects should have been explicitly deallocated, and reports exceptions.
  51 //   Finalization and the test program are not usable in this mode.
  52 // -DSOLARIS_THREADS enables support for Solaris (thr_) threads.
  53 //   (Clients should also define SOLARIS_THREADS and then include
  54 //   gc.h before performing thr_ or GC_ operations.)
  55 //   This is broken on nonSPARC machines.
  56 // -DALL_INTERIOR_POINTERS allows all pointers to the interior
  57 //   of objects to be recognized.  (See gc_priv.h for consequences.)
  58 // -DSMALL_CONFIG tries to tune the collector for small heap sizes,
  59 //   usually causing it to use less space in such situations.
  60 //   Incremental collection no longer works in this case.
  61 // -DLARGE_CONFIG tunes the collector for unusually large heaps.
  62 //   Necessary for heaps larger than about 500 MB on most machines.
  63 //   Recommended for heaps larger than about 64 MB.
  64 // -DDONT_ADD_BYTE_AT_END is meaningful only with
  65 //   -DALL_INTERIOR_POINTERS.  Normally -DALL_INTERIOR_POINTERS
  66 //   causes all objects to be padded so that pointers just past the end of
  67 //   an object can be recognized.  This can be expensive.  (The padding
  68 //   is normally more than one byte due to alignment constraints.)
  69 //   -DDONT_ADD_BYTE_AT_END disables the padding.
  70 // -DNO_SIGNALS does not disable signals during critical parts of
  71 //   the GC process.  This is no less correct than many malloc
  72 //   implementations, and it sometimes has a significant performance
  73 //   impact.  However, it is dangerous for many not-quite-ANSI C
  74 //   programs that call things like printf in asynchronous signal handlers.
  75 // -DGC_OPERATOR_NEW_ARRAY declares that the C++ compiler supports the
  76 //   new syntax "operator new[]" for allocating and deleting arrays.
  77 //   See gc_cpp.h for details.  No effect on the C part of the collector.
  78 //   This is defined implicitly in a few environments.
  79 // -DREDIRECT_MALLOC=X causes malloc, realloc, and free to be defined
  80 //   as aliases for X, GC_realloc, and GC_free, respectively.
  81 //   Calloc is redefined in terms of the new malloc.  X should
  82 //   be either GC_malloc or GC_malloc_uncollectable.
  83 //   The former is occasionally useful for working around leaks in code
  84 //   you don't want to (or can't) look at.  It may not work for
  85 //   existing code, but it often does.  Neither works on all platforms,
  86 //   since some ports use malloc or calloc to obtain system memory.
  87 //   (Probably works for UNIX, and win32.)
  88 // -DNO_DEBUG removes GC_dump and the debugging routines it calls.
  89 //   Reduces code size slightly at the expense of debuggability.