re PR pch/14940 (PCH largefile test fails on various platforms)

	PR pch/14940
	* config/alpha/host-osf.c: New file.
	* config/alpha/x-osf: New file.
	* config.host (alpha*-dec-osf*): Use it.

From-SVN: r170166

gcc/ChangeLog

+2011-02-15  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	PR pch/14940
+	* config/alpha/host-osf.c: New file.
+	* config/alpha/x-osf: New file.
+	* config.host (alpha*-dec-osf*): Use it.
+
 2011-02-14  Anatoly Sokolov  <aesok@post.ru>
 
 	* config/rx/rx.h (GO_IF_MODE_DEPENDENT_ADDRESS): Remove.

gcc/config.host

 # GCC host-specific configuration file.
 # Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2006, 2007, 2008, 2009,
-# 2010 Free Software Foundation, Inc.
+# 2010, 2011 Free Software Foundation, Inc.
 
 #This file is part of GCC.
 
@@ -169,6 +169,10 @@ case ${host} in
     prefix=/gnu
     local_prefix=/gnu/local
     ;;
+  alpha*-dec-osf*)
+    out_host_hook_obj=host-osf.o
+    host_xmake_file="${host_xmake_file} alpha/x-osf"
+    ;;
   alpha*-dec-*vms*)
     host_xm_file="vms/xm-vms.h"
     host_xmake_file=vms/x-vms

gcc/config/alpha/host-osf.c

+/* Tru64 UNIX host-specific hook definitions.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include <sys/mman.h>
+/* Inhibit inclusion of <sys/mount.h>, unnecessary and errors out due to
+   use of poisoned bcmp, bcopy.  */
+#define _SYS_MOUNT_H_
+#include <sys/procfs.h>
+#include "hosthooks.h"
+#include "hosthooks-def.h"
+
+
+#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
+#define HOST_HOOKS_GT_PCH_GET_ADDRESS osf_gt_pch_get_address
+#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
+#define HOST_HOOKS_GT_PCH_USE_ADDRESS osf_gt_pch_use_address
+
+/* The mmap ADDR parameter may be ignored without MAP_FIXED set.  Before we
+   give up, check existing mappings with ioctl(PIOCMAP) to see if the space
+   is really free.  */
+
+static void *
+mmap_fixed (void *addr, size_t len, int prot, int flags, int fd, off_t off)
+{
+  void *base;
+
+  base = mmap ((caddr_t) addr, len, prot, flags, fd, off);
+  
+  if (base != addr)
+    {
+      /* PID_MAX is SHRT_MAX on Tru64 UNIX V4.0, but INT_MAX on V5.1.
+	 Allow for both.  "/proc/" + INT_MAX + '\0'.  */
+      char pname[6+10+1];
+      int procfd, nmap;
+      prmap_t *pmap;
+      int i, overlap = 0;
+
+      if (base != (void *) MAP_FAILED)
+	munmap ((caddr_t) base, len);
+
+      /* Check if there's any mapping overlapping [addr, addr+len).  */
+
+      snprintf (pname, sizeof (pname), "/proc/%d", getpid ());
+      procfd = open (pname, O_RDONLY);
+      if (procfd == -1)
+	return ((void *) MAP_FAILED);
+      if (ioctl (procfd, PIOCNMAP, &nmap) == -1)
+	return ((void *) MAP_FAILED);
+      pmap = (prmap_t *) xmalloc (sizeof (*pmap) * (nmap+1));
+      if (ioctl (procfd, PIOCMAP, pmap) == -1)
+	return ((void *) MAP_FAILED);
+
+      /* It seems like pmap[] is sorted by address, but can we rely on
+	 that?  */
+      for (i = 0; i < nmap; i++)
+	{
+	  uintptr_t map_start = (uintptr_t) pmap[i].pr_vaddr;
+	  uintptr_t map_end = map_start + pmap[i].pr_size;
+
+	  if ((uintptr_t) addr < map_end
+	      && (uintptr_t) addr+len > map_start)
+	    {
+	      overlap = 1;
+	      break;
+	    }
+	}
+      free (pmap);
+      close (procfd);
+
+      if (!overlap)
+	base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off);
+      else
+	base = mmap ((caddr_t) addr, len, prot, flags, fd, off);
+    }
+
+  return base;
+}
+
+/* For various ports, try to guess a fixed spot in the vm space that's
+   probably free.  Take the middle between start of text segment and
+   dynamic loader space.  See <sys/machine/addrconf.h> and Tru64 UNIX
+   Assembly Language Programmer's Guide, p.6-18, Figure 6-3: Default Layout
+   of Memory (User Program View).  */
+#define TRY_EMPTY_VM_SPACE	0x20050000000
+
+/* Determine a location where we might be able to reliably allocate
+   SIZE bytes.  FD is the PCH file, though we should return with the
+   file unmapped.  */
+
+static void *
+osf_gt_pch_get_address (size_t size, int fd)
+{
+  void *addr;
+
+  addr = mmap_fixed ((caddr_t) TRY_EMPTY_VM_SPACE, size,
+		     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+
+  /* If we failed the map, that means there's *no* free space.  */
+  if (addr == (void *) MAP_FAILED)
+    return NULL;
+  /* Unmap the area before returning.  */
+  munmap ((caddr_t) addr, size);
+
+  return addr;
+}
+
+/* Map SIZE bytes of FD+OFFSET at BASE.  Return 1 if we succeeded at 
+   mapping the data at BASE, -1 if we couldn't.  */
+
+static int
+osf_gt_pch_use_address (void *base, size_t size, int fd, size_t offset)
+{
+  void *addr;
+
+  /* We're called with size == 0 if we're not planning to load a PCH
+     file at all.  This allows the hook to free any static space that
+     we might have allocated at link time.  */
+  if (size == 0)
+    return -1;
+
+  addr = mmap_fixed ((caddr_t) base, size,
+		     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset);
+
+  return addr == base ? 1 : -1;
+}
+
+
+const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;

gcc/config/alpha/x-osf

+host-osf.o : $(srcdir)/config/alpha/host-osf.c $(CONFIG_H) $(SYSTEM_H) \
+  coretypes.h hosthooks.h hosthooks-def.h $(HOOKS_H)
+	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) \
+		$(srcdir)/config/alpha/host-osf.c