* Makefile.am, acinclude.m4, configure.in: Imported GC 6.1 Alpha 1

	and merged local changes.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@46283 138bc75d-0d04-0410-961f-82ee72b054a4

7 files changed, 146 insertions, 96 deletions

diff --git a/boehm-gc/include/Makefile.in b/boehm-gc/include/Makefile.in
index dccf0c7d4cb..3c8f7fb63e7 100644
--- a/boehm-gc/include/Makefile.in
+++ b/boehm-gc/include/Makefile.in
@@ -1,4 +1,4 @@
-# Makefile.in generated automatically by automake 1.4 from Makefile.am
+# Makefile.in generated automatically by automake 1.4-p1 from Makefile.am
 
 # Copyright (C) 1994, 1995-8, 1999 Free Software Foundation, Inc.
 # This Makefile.in is free software; the Free Software Foundation
diff --git a/boehm-gc/include/gc.h b/boehm-gc/include/gc.h
index aaf29ee35ba..8ac709b9b5d 100644
--- a/boehm-gc/include/gc.h
+++ b/boehm-gc/include/gc.h
@@ -30,13 +30,9 @@
 
 # define _GC_H
 
-#if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
-#   define SOLARIS_THREADS
-#endif
-
 /*
  * Some tests for old macros.  These violate our namespace rules and will
- * disappear shortly.
+ * disappear shortly.  Use the GC_ names.
  */
 #if defined(SOLARIS_THREADS) || defined(_SOLARIS_THREADS)
 # define GC_SOLARIS_THREADS
@@ -72,6 +68,16 @@
 	/* depend on this were previously included.			*/
 #endif
 
+#if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
+#   define GC_SOLARIS_THREADS
+#endif
+
+# if defined(GC_SOLARIS_PTHREADS) || defined(GC_FREEBSD_THREADS) || \
+	defined(GC_IRIX_THREADS) || defined(GC_LINUX_THREADS) || \
+	defined(GC_HPUX_THREADS) || defined(GC_OSF1_THREADS)
+#   define GC_PTHREADS
+# endif
+
 # define __GC
 # include <stddef.h>
 # ifdef _WIN32_WCE
@@ -80,7 +86,7 @@
     typedef long ptrdiff_t;	/* ptrdiff_t is not defined */
 # endif
 
-#if defined(__MINGW32__) && defined(WIN32_THREADS)
+#if defined(__MINGW32__) && defined(GC_WIN32_THREADS)
 # ifdef GC_BUILD
 #   define GC_API __declspec(dllexport)
 # else
@@ -815,16 +821,12 @@ GC_API void (*GC_is_visible_print_proc)
 /* thread library calls.  We do that here by macro defining them.	*/
 
 #if !defined(GC_USE_LD_WRAP) && \
-    (defined(GC_LINUX_THREADS) || defined(GC_HPUX_THREADS) || \
-     defined(GC_IRIX_THREADS) || defined(GC_SOLARIS_PTHREADS) || \
-     defined(GC_SOLARIS_THREADS) || defined(GC_OSF1_THREADS))
+    (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS))
 # include "gc_pthread_redirects.h"
 #endif
 
 # if defined(PCR) || defined(GC_SOLARIS_THREADS) || \
-     defined(GC_SOLARIS_PTHREADS) || defined(GC_WIN32_THREADS) || \
-     defined(GC_IRIX_THREADS) || defined(GC_LINUX_THREADS) || \
-     defined(GC_HPUX_THREADS)
+     defined(GC_PTHREADS) || defined(GC_WIN32_THREADS)
    	/* Any flavor of threads except SRC_M3.	*/
 /* This returns a list of objects, linked through their first		*/
 /* word.  Its use can greatly reduce lock contention problems, since	*/
@@ -839,7 +841,7 @@ extern void GC_thr_init();	/* Needed for Solaris/X86	*/
 
 #endif /* THREADS && !SRC_M3 */
 
-#if defined(WIN32_THREADS) && defined(_WIN32_WCE)
+#if defined(GC_WIN32_THREADS) && defined(_WIN32_WCE)
 # include <windows.h>
 
   /*
diff --git a/boehm-gc/include/gc_gcj.h b/boehm-gc/include/gc_gcj.h
index 9123a28bb49..5e932afe8d0 100644
--- a/boehm-gc/include/gc_gcj.h
+++ b/boehm-gc/include/gc_gcj.h
@@ -47,8 +47,6 @@
 /* The following allocators signal an out of memory condition with	*/
 /* return GC_oom_fn(bytes);						*/
 
-extern void * (*GC_oom_action)(void);
-
 /* The following function must be called before the gcj allocators	*/
 /* can be invoked.							*/
 /* mp_index and mp are the index and mark_proc (see gc_mark.h)		*/
diff --git a/boehm-gc/include/new_gc_alloc.h b/boehm-gc/include/new_gc_alloc.h
index 1187f0b69f7..aad9446543e 100644
--- a/boehm-gc/include/new_gc_alloc.h
+++ b/boehm-gc/include/new_gc_alloc.h
@@ -50,7 +50,20 @@
 #ifndef GC_ALLOC_H
 
 #include "gc.h"
-#include <stack>  // A more portable way to get stl_alloc.h .
+
+#if (__GNUC__ < 3)
+# include <stack>  // A more portable way to get stl_alloc.h .
+#else
+# include <bits/stl_alloc.h>
+# ifndef __STL_BEGIN_NAMESPACE
+# define __STL_BEGIN_NAMESPACE namespace std {
+# define __STL_END_NAMESPACE };
+# endif
+#ifndef __STL_USE_STD_ALLOCATORS
+#define __STL_USE_STD_ALLOCATORS
+#endif
+#endif
+
 
 #define GC_ALLOC_H
 
diff --git a/boehm-gc/include/private/gc_locks.h b/boehm-gc/include/private/gc_locks.h
index eed9f1050f8..5ea1e543e76 100644
--- a/boehm-gc/include/private/gc_locks.h
+++ b/boehm-gc/include/private/gc_locks.h
@@ -76,7 +76,7 @@
 #    define LOCK() RT0u__inCritical++
 #    define UNLOCK() RT0u__inCritical--
 #  endif
-#  ifdef SOLARIS_THREADS
+#  ifdef GC_SOLARIS_THREADS
 #    include <thread.h>
 #    include <signal.h>
      extern mutex_t GC_allocate_ml;
@@ -261,8 +261,8 @@
 #    define USE_PTHREAD_LOCKS
 #  endif
 
-#  if defined(LINUX_THREADS) || defined(OSF1_THREADS) \
-      || defined(HPUX_THREADS)
+#  if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
+      && !defined(GC_IRIX_THREADS)
 #    define NO_THREAD (pthread_t)(-1)
 #    include <pthread.h>
 #    if defined(PARALLEL_MARK) 
@@ -412,8 +412,8 @@
 #   ifdef GC_ASSERTIONS
       extern pthread_t GC_mark_lock_holder;
 #   endif
-#  endif /* LINUX_THREADS || OSF1_THREADS  || HPUX_THREADS */
-#  if defined(IRIX_THREADS)
+#  endif /* GC_PTHREADS with linux_threads.c implementation */
+#  if defined(GC_IRIX_THREADS)
 #    include <pthread.h>
      /* This probably should never be included, but I can't test	*/
      /* on Irix anymore.						*/
@@ -439,8 +439,8 @@
 		    GC_collecting = 1; \
 		}
 #    define EXIT_GC() GC_collecting = 0;
-#  endif /* IRIX_THREADS */
-#  ifdef WIN32_THREADS
+#  endif /* GC_IRIX_THREADS */
+#  ifdef GC_WIN32_THREADS
 #    include <windows.h>
      GC_API CRITICAL_SECTION GC_allocate_ml;
 #    define LOCK() EnterCriticalSection(&GC_allocate_ml);
diff --git a/boehm-gc/include/private/gc_priv.h b/boehm-gc/include/private/gc_priv.h
index 5135e3e9b0a..ad204e99267 100644
--- a/boehm-gc/include/private/gc_priv.h
+++ b/boehm-gc/include/private/gc_priv.h
@@ -443,18 +443,21 @@ struct hblk;	/* See below.	*/
 /* clear on that point).  Standard malloc implementations are usually	*/
 /* neither interruptable nor thread-safe, and thus correspond to	*/
 /* empty definitions.							*/
+/* It probably doesn't make any sense to declare these to be nonempty	*/
+/* if the code is being optimized, since signal safety relies on some	*/
+/* ordering constraints that are typically not obeyed by optimizing	*/
+/* compilers.								*/
 # ifdef PCR
 #   define DISABLE_SIGNALS() \
 		 PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask)
 #   define ENABLE_SIGNALS() \
 		PCR_Th_SetSigMask(&GC_old_sig_mask, NIL)
 # else
-#   if defined(SRC_M3) || defined(AMIGA) || defined(SOLARIS_THREADS) \
+#   if defined(THREADS) || defined(AMIGA)  \
 	|| defined(MSWIN32) || defined(MSWINCE) || defined(MACOS) \
-	|| defined(DJGPP) || defined(NO_SIGNALS) || defined(IRIX_THREADS) \
-	|| defined(LINUX_THREADS) 
+	|| defined(DJGPP) || defined(NO_SIGNALS) 
 			/* Also useful for debugging.		*/
-	/* Should probably use thr_sigsetmask for SOLARIS_THREADS. */
+	/* Should probably use thr_sigsetmask for GC_SOLARIS_THREADS. */
 #     define DISABLE_SIGNALS()
 #     define ENABLE_SIGNALS()
 #   else
@@ -479,9 +482,8 @@ struct hblk;	/* See below.	*/
  				   PCR_allSigsBlocked, \
  				   PCR_waitForever);
 # else
-#   if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
-	|| defined(IRIX_THREADS) || defined(LINUX_THREADS) \
-	|| defined(HPUX_THREADS)
+#   if defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) \
+	|| defined(GC_PTHREADS)
       void GC_stop_world();
       void GC_start_world();
 #     define STOP_WORLD() GC_stop_world()
@@ -566,7 +568,8 @@ extern GC_warn_proc GC_current_warn_proc;
 # ifdef SMALL_CONFIG
 #   define CPP_LOG_HBLKSIZE 10
 # else
-#   if CPP_WORDSZ == 32
+#   if (CPP_WORDSZ == 32) || (defined(HPUX) && defined(HP_PA))
+      /* HPUX/PA seems to use 4K pages with the 64 bit ABI */
 #     define CPP_LOG_HBLKSIZE 12
 #   else
 #     define CPP_LOG_HBLKSIZE 13
@@ -1903,8 +1906,7 @@ void GC_err_puts GC_PROTO((GC_CONST char *s));
 		/* some other reason.					*/
 # endif /* PARALLEL_MARK */
 
-# if defined(LINUX_THREADS) || defined(IRIX_THREADS) \
-     || defined(HPUX_THREADS) || defined(OSF1_THREADS)
+# if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS)
   /* We define the thread suspension signal here, so that we can refer	*/
   /* to it in the dirty bit implementation, if necessary.  Ideally we	*/
   /* would allocate a (real-time ?) signal using the standard mechanism.*/
@@ -1912,16 +1914,16 @@ void GC_err_puts GC_PROTO((GC_CONST char *s));
   /* in Linux glibc, but it's not exported.)  Thus we continue to use	*/
   /* the same hard-coded signals we've always used.			*/
 #  if !defined(SIG_SUSPEND)
-#   if defined(LINUX_THREADS)
+#   if defined(GC_LINUX_THREADS)
 #    if defined(SPARC) && !defined(SIGPWR)
        /* SPARC/Linux doesn't properly define SIGPWR in <signal.h>.
         * It is aliased to SIGLOST in asm/signal.h, though.		*/
 #      define SIG_SUSPEND SIGLOST
 #    else
-       /* Linuxthreads uses SIGUSR1 and SIGUSR2.			*/
+       /* Linuxthreads itself uses SIGUSR1 and SIGUSR2.			*/
 #      define SIG_SUSPEND SIGPWR
 #    endif
-#   else  /* !LINUX_THREADS */
+#   else  /* !GC_LINUX_THREADS */
 #    define SIG_SUSPEND _SIGRTMIN + 6
 #   endif
 #  endif /* !SIG_SUSPEND */
diff --git a/boehm-gc/include/private/gcconfig.h b/boehm-gc/include/private/gcconfig.h
index 4e20f48ade3..e92f2a4eb0c 100644
--- a/boehm-gc/include/private/gcconfig.h
+++ b/boehm-gc/include/private/gcconfig.h
@@ -33,6 +33,11 @@
 #    define NETBSD
 # endif
 
+/* And one for OpenBSD: */
+# if defined(__OpenBSD__)
+#    define OPENBSD
+# endif
+
 /* Determine the machine type: */
 # if defined(sun) && defined(mc68000)
 #    define M68K
@@ -44,25 +49,23 @@
 #    define HP
 #    define mach_type_known
 # endif
-# if defined(__OpenBSD__) && defined(m68k)
+# if defined(OPENBSD) && defined(m68k)
 #    define M68K
-#    define OPENBSD
 #    define mach_type_known
 # endif
-# if defined(__OpenBSD__) && defined(__sparc__)
+# if defined(OPENBSD) && defined(__sparc__)
 #    define SPARC
-#    define OPENBSD
 #    define mach_type_known
 # endif
-# if defined(__NetBSD__) && defined(m68k)
+# if defined(NETBSD) && defined(m68k)
 #    define M68K
 #    define mach_type_known
 # endif
-# if defined(__NetBSD__) && defined(__powerpc__)
+# if defined(NETBSD) && defined(__powerpc__)
 #    define POWERPC
 #    define mach_type_known
 # endif
-# if defined(__NetBSD__) && defined(__arm32__)
+# if defined(NETBSD) && defined(__arm32__)
 #    define ARM32
 #    define mach_type_known
 # endif
@@ -161,6 +164,11 @@
 #   endif
 #   define mach_type_known
 # endif
+# if defined(__ia64) && defined(_HPUX_SOURCE)
+#   define IA64
+#   define HPUX
+#   define mach_type_known
+# endif
 # if defined(__BEOS__) && defined(_X86_)
 #    define I386
 #    define BEOS
@@ -196,7 +204,7 @@
 # endif
 # if defined(__alpha) || defined(__alpha__)
 #   define ALPHA
-#   if !defined(LINUX) && !defined(NETBSD)
+#   if !defined(LINUX) && !defined(NETBSD) && !defined(OPENBSD)
 #     define OSF1	/* a.k.a Digital Unix */
 #   endif
 #   define mach_type_known
@@ -386,7 +394,7 @@
                     /*		   RS6000     ==> IBM RS/6000 AIX3.X	*/
                     /*		   RT	      ==> IBM PC/RT		*/
                     /*		   HP_PA      ==> HP9000/700 & /800	*/
-                    /*				  HP/UX, LINUX			*/
+                    /*				  HP/UX, LINUX		*/
 		    /*		   SPARC      ==> SPARC	v7/v8/v9	*/
 		    /*			(SUNOS4, SUNOS5, LINUX,		*/
 		    /*			 DRSNX variants)		*/
@@ -398,8 +406,11 @@
 		    /* 			running Amdahl UTS4		*/
 		    /*			or a 390 running LINUX		*/
 		    /* 		   ARM32      ==> Intel StrongARM	*/
-		    /* 		   IA64	      ==> Intel IA64		*/
+		    /* 		   IA64	      ==> Intel IPF		*/
 		    /*				  (e.g. Itanium)	*/
+		    /*			(LINUX and HPUX)	        */
+		    /* 		   IA64_32    ==> IA64 w/32 bit ABI	*/
+		    /* 			(HPUX)				*/
 		    /*		   SH	      ==> Hitachi SuperH	*/
 		    /* 			(LINUX & MSWINCE)		*/
 
@@ -533,7 +544,7 @@
 #   ifdef LINUX
 #       define OS_TYPE "LINUX"
 #       define STACKBOTTOM ((ptr_t)0xf0000000)
-#       define MPROTECT_VDB
+/* #       define MPROTECT_VDB - Reported to not work  9/17/01 */
 #       ifdef __ELF__
 #            define DYNAMIC_LOADING
 #	     include <features.h>
@@ -891,7 +902,7 @@
 	  /* with 2GB physical memory will usually move the user	*/
 	  /* address space limit, and hence initial SP to 0x80000000.	*/
 #       endif
-#       if !defined(LINUX_THREADS) || !defined(REDIRECT_MALLOC)
+#       if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
 #	    define MPROTECT_VDB
 #	else
 	    /* We seem to get random errors in incremental mode,	*/
@@ -1008,6 +1019,9 @@
 #	define OS_TYPE "FREEBSD"
 #	define MPROTECT_VDB
 #	define FREEBSD_STACKBOTTOM
+#	ifdef __ELF__
+#	    define DYNAMIC_LOADING
+#	endif
 #   endif
 #   ifdef NETBSD
 #	define OS_TYPE "NETBSD"
@@ -1164,7 +1178,6 @@
 
 # ifdef HP_PA
 #   define MACH_TYPE "HP_PA"
-#   define OS_TYPE "HPUX"
 #   ifdef __LP64__
 #     define CPP_WORDSZ 64
 #     define ALIGNMENT 8
@@ -1173,8 +1186,7 @@
 #     define ALIGNMENT 4
 #     define ALIGN_DOUBLE
 #   endif
-#   if !defined(GC_HPUX_THREADS) && !defined(HPUX_THREADS) \
-       && !defined(GC_LINUX_THREADS) && !defined(LINUX_THREADS)
+#   if !defined(GC_HPUX_THREADS) && !defined(GC_LINUX_THREADS)
 #     ifndef LINUX /* For now. */
 #       define MPROTECT_VDB
 #     endif
@@ -1189,6 +1201,7 @@
 #   endif
 #   define STACK_GROWS_UP
 #   ifdef HPUX
+#     define OS_TYPE "HPUX"
       extern int __data_start;
 #     define DATASTART ((ptr_t)(&__data_start))
 #     if 0
@@ -1240,6 +1253,19 @@
 #   	define CPP_WORDSZ 64
 #       define DYNAMIC_LOADING
 #   endif
+#   ifdef OPENBSD
+#	define OS_TYPE "OPENBSD"
+#	define HEURISTIC2
+#   	define CPP_WORDSZ 64
+#   	ifdef __ELF__	/* since OpenBSD/Alpha 2.9 */
+#	   define DATASTART GC_data_start
+#   	   define ELFCLASS32 32
+#   	   define ELFCLASS64 64
+#   	   define ELF_CLASS ELFCLASS64
+#       else		/* ECOFF, until OpenBSD/Alpha 2.7 */
+#   	   define DATASTART ((ptr_t) 0x140000000)
+#   	endif
+#   endif
 #   ifdef OSF1
 #	define OS_TYPE "OSF1"
 #   	define DATASTART ((ptr_t) 0x140000000)
@@ -1282,9 +1308,6 @@
 
 # ifdef IA64
 #   define MACH_TYPE "IA64"
-#   define ALIGN_DOUBLE
-	/* Requires 16 byte alignment for malloc */
-#   define ALIGNMENT 8
 #   define USE_GENERIC_PUSH_REGS
 	/* We need to get preserved registers in addition to register   */
 	/* windows.   That's easiest to do with setjmp.			*/
@@ -1294,11 +1317,47 @@
 	    /* setting mark bits.					*/
 #   endif
 #   ifdef HPUX
-	--> needs work
+#	ifdef _ILP32
+#	  define CPP_WORDSZ 32
+#         define ALIGN_DOUBLE
+	    /* Requires 8 byte alignment for malloc */
+#   	  define ALIGNMENT 4
+#       else
+#	  ifndef _LP64
+		---> unknown ABI
+#         endif
+#	  define CPP_WORDSZ 64
+#   	  define ALIGN_DOUBLE
+	    /* Requires 16 byte alignment for malloc */
+#         define ALIGNMENT 8
+#       endif
+#       define OS_TYPE "HPUX"	
+        extern int __data_start;
+#       define DATASTART ((ptr_t)(&__data_start))
+        /* Gustavo Rodriguez-Rivera suggested changing HEURISTIC2	*/
+        /* to this.  Note that the GC must be initialized before the	*/
+    	/* first putenv call.						*/
+	extern char ** environ;
+#       define STACKBOTTOM ((ptr_t)environ)
+#       define DYNAMIC_LOADING
+#       include <unistd.h>
+#       define GETPAGESIZE() sysconf(_SC_PAGE_SIZE)
+ 	/* The following was empirically determined, and is probably	*/
+	/* not very robust.						*/
+	/* Note that the backing store base seems to be at a nice 	*/
+	/* address minus one page.					*/
+#	define BACKING_STORE_DISPLACEMENT 0x1000000
+#	define BACKING_STORE_ALIGNMENT 0x1000
+#       define BACKING_STORE_BASE \
+	  (ptr_t)(((word)GC_stackbottom - BACKING_STORE_DISPLACEMENT - 1) \
+			& ~(BACKING_STORE_ALIGNMENT - 1))
 #   endif
 #   ifdef LINUX
+#   	define CPP_WORDSZ 64
+#   	define ALIGN_DOUBLE
+	  /* Requires 16 byte alignment for malloc */
+#   	define ALIGNMENT 8
 #       define OS_TYPE "LINUX"
-#       define CPP_WORDSZ 64
 	/* The following works on NUE and older kernels:	*/
 /* #       define STACKBOTTOM ((ptr_t) 0xa000000000000000l)	*/
 	/* This does not work on NUE:				*/
@@ -1579,57 +1638,33 @@
 	((word*)x)[1] = 0;
 # endif /* CLEAR_DOUBLE */
 
-/* Internally to the collector we test only the XXX_THREADS macros	*/
-/* not the GC_XXX_THREADS versions.  Here we make sure the latter	*/
-/* are treated as equivalent.						*/
-#if defined(GC_SOLARIS_THREADS) && !defined(_SOLARIS_THREADS)
-#   define _SOLARIS_THREADS
-#endif
-#if defined(GC_SOLARIS_THREADS) && !defined(_SOLARIS_PTHREADS)
-#   define _SOLARIS_PTHREADS
-#endif
-#if defined(GC_IRIX_THREADS) && !defined(IRIX_THREADS)
-#   define IRIX_THREADS
-#endif
-#if defined(GC_LINUX_THREADS) && !defined(LINUX_THREADS)
-#   define LINUX_THREADS
-#endif
-#if defined(GC_WIN32_THREADS) && !defined(WIN32_THREADS)
-#   define WIN32_THREADS
-#endif
-#if defined(GC_HPUX_THREADS) && !defined(HPUX_THREADS)
-#   define HPUX_THREADS
-#endif
-#if defined(GC_OSF1_THREADS) && !defined(OSF1_THREADS)
-#   define OSF1_THREADS
-#endif
-
-/* Internally we use SOLARIS_THREADS to test for either old or pthreads. */
-# if defined(_SOLARIS_PTHREADS) && !defined(SOLARIS_THREADS)
-#   define SOLARIS_THREADS
+/* Internally we use GC_SOLARIS_THREADS to test for either old or pthreads. */
+# if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
+#   define GC_SOLARIS_THREADS
 # endif
-# if defined(IRIX_THREADS) && !defined(IRIX5)
+
+# if defined(GC_IRIX_THREADS) && !defined(IRIX5)
 --> inconsistent configuration
 # endif
-# if defined(LINUX_THREADS) && !defined(LINUX)
+# if defined(GC_LINUX_THREADS) && !defined(LINUX)
 --> inconsistent configuration
 # endif
-# if defined(SOLARIS_THREADS) && !defined(SUNOS5)
+# if defined(GC_SOLARIS_THREADS) && !defined(SUNOS5)
 --> inconsistent configuration
 # endif
-# if defined(HPUX_THREADS) && !defined(HPUX)
+# if defined(GC_HPUX_THREADS) && !defined(HPUX)
 --> inconsistent configuration
 # endif
-# if defined(WIN32_THREADS) && !defined(MSWIN32)
-    /* Ideally CYGWIN32 should work, in addition to MSWIN32.  I suspect the necessary code	*/
-    /* is mostly there, but nobody has actually made sure the right combination of pieces is	*/
-    /* compiled in, etc.									*/
+# if defined(GC_WIN32_THREADS) && !defined(MSWIN32)
+    /* Ideally CYGWIN32 should work, in addition to MSWIN32.  I suspect	*/
+    /* the necessary code is mostly there, but nobody has actually made */
+    /* sure the right combination of pieces is compiled in, etc.	*/
 --> inconsistent configuration
 # endif
+
 # if defined(PCR) || defined(SRC_M3) || \
-	defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
-	defined(IRIX_THREADS) || defined(LINUX_THREADS) || \
-	defined(HPUX_THREADS) || defined(OSF1_THREADS)
+	defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) || \
+	defined(GC_PTHREADS)
 #   define THREADS
 # endif