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diff --git a/gcc/config/host-solaris.c b/gcc/config/host-solaris.c
new file mode 100644
index 00000000..3a367051
--- /dev/null
+++ b/gcc/config/host-solaris.c
@@ -0,0 +1,78 @@
+/* Solaris host-specific hook definitions.
+   Copyright (C) 2004, 2007, 2008 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>
+#include "hosthooks.h"
+#include "hosthooks-def.h"
+
+
+#undef HOST_HOOKS_GT_PCH_USE_ADDRESS
+#define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address
+
+/* 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
+sol_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 ((caddr_t) base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
+	       fd, offset);
+
+  /* Solaris isn't good about honoring the mmap START parameter
+     without MAP_FIXED set.  Before we give up, search the desired
+     address space with mincore to see if the space is really free.  */
+  if (addr != base)
+    {
+      size_t page_size = getpagesize();
+      char one_byte;
+      size_t i;
+
+      if (addr != (void *) MAP_FAILED)
+	munmap ((caddr_t) addr, size);
+
+      errno = 0;
+      for (i = 0; i < size; i += page_size)
+	if (mincore ((char *)base + i, page_size, (char *) &one_byte) == -1
+	    && errno == ENOMEM)
+	  continue; /* The page is not mapped.  */
+	else
+	  break;
+
+      if (i >= size)
+	addr = mmap ((caddr_t) base, size, 
+		     PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
+		     fd, offset);
+    }
+
+  return addr == base ? 1 : -1;
+}
+
+
+const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;