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-See README.alpha for Linux on DEC AXP info.
-
-This file applies mostly to Linux/Intel IA32.  Ports to Linux on an M68K, IA64,
-SPARC, MIPS, Alpha and PowerPC are also integrated.  They should behave
-similarly, except that the PowerPC port lacks incremental GC support, and
-it is unknown to what extent the Linux threads code is functional.
-See below for M68K specific notes.
-
-Incremental GC is generally supported.
-
-Dynamic libraries are supported on an ELF system.  A static executable
-should be linked with the gcc option "-Wl,-defsym,_DYNAMIC=0".
-
-The collector appears to work reliably with Linux threads, but beware 
-of older versions of glibc and gdb.
-
-The garbage collector uses SIGPWR and SIGXCPU if it is used with
-Linux threads.  These should not be touched by the client program.
-
-To use threads, you need to abide by the following requirements:
-
-1) You need to use LinuxThreads or NPTL (which are included in libc6).
-
-   The collector relies on some implementation details of the LinuxThreads
-   package.  This code may not work on other
-   pthread implementations (in particular it will *not* work with
-   MIT pthreads).
-
-2) You must compile the collector with -DGC_LINUX_THREADS and -D_REENTRANT
-   specified in the Makefile.
-
-3a) Every file that makes thread calls should define GC_LINUX_THREADS and 
-   _REENTRANT and then include gc.h.  Gc.h redefines some of the
-   pthread primitives as macros which also provide the collector with
-   information it requires.
-
-3b) A new alternative to (3a) is to build the collector and compile GC clients
-   with -DGC_USE_LD_WRAP, and to link the final program with
-
-   (for ld) --wrap read --wrap dlopen --wrap pthread_create \
-	    --wrap pthread_join --wrap pthread_detach \
-	    --wrap pthread_sigmask --wrap sleep
-
-   (for gcc) -Wl,--wrap -Wl,read -Wl,--wrap -Wl,dlopen -Wl,--wrap \
-	     -Wl,pthread_create -Wl,--wrap -Wl,pthread_join -Wl,--wrap \
-	     -Wl,pthread_detach -Wl,--wrap -Wl,pthread_sigmask \
-	     -Wl,--wrap -Wl,sleep
-
-   In any case, _REENTRANT should be defined during compilation.
-
-4) Dlopen() disables collection during its execution.  (It can't run
-   concurrently with the collector, since the collector looks at its
-   data structures.  It can't acquire the allocator lock, since arbitrary
-   user startup code may run as part of dlopen().)  Under unusual
-   conditions, this may cause unexpected heap growth.
-
-5) The combination of GC_LINUX_THREADS, REDIRECT_MALLOC, and incremental
-   collection fails in seemingly random places.  This hasn't been tracked
-   down yet, but is perhaps not completely astonishing.  The thread package
-   uses malloc, and thus can presumably get SIGSEGVs while inside the
-   package.  There is no real guarantee that signals are handled properly
-   at that point.
-
-6) Thread local storage may not be viewed as part of the root set by the
-   collector.  This probably depends on the linuxthreads version.  For the
-   time being, any collectable memory referenced by thread local storage should
-   also be referenced from elsewhere, or be allocated as uncollectable.
-   (This is really a bug that should be fixed somehow.)
-
-
-M68K LINUX:
-(From Richard Zidlicky)
-The bad news is that it can crash every linux-m68k kernel on a 68040,
-so an additional test is needed somewhere on startup. I have meanwhile
-patches to correct the problem in 68040 buserror handler but it is not
-yet in any standard kernel.
-
-Here is a simple test program to detect whether the kernel has the
-problem. It could be run as a separate check in configure or tested 
-upon startup. If it fails (return !0) than mprotect can't be used
-on that system.
-
-/*
- * test for bug that may crash 68040 based Linux
- */
-
-#include <sys/mman.h>
-#include <signal.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-
-char *membase;
-int pagesize=4096;
-int pageshift=12;
-int x_taken=0;
-
-int sighandler(int sig)
-{
-   mprotect(membase,pagesize,PROT_READ|PROT_WRITE);
-   x_taken=1;
-}
-
-main()
-{
-  long l;
-
-   signal(SIGSEGV,sighandler);
-   l=(long)mmap(NULL,pagesize,PROT_READ,MAP_PRIVATE | MAP_ANON,-1,0);
-  if (l==-1)
-     {
-       perror("mmap/malloc");
-       abort();
-     }
-  membase=(char*)l;
-    *(long*)(membase+sizeof(long))=123456789;
-  if (*(long*)(membase+sizeof(long)) != 123456789 )
-    {
-      fprintf(stderr,"writeback failed !\n");
-      exit(1);
-    }
-  if (!x_taken)
-    {
-      fprintf(stderr,"exception not taken !\n");
-      exit(1);
-    }
-  fprintf(stderr,"vmtest Ok\n");
-  exit(0);
-}
-
-