* mremap.c: New file.

* configure.ac: Call AC_REPLACE_FUNCS on mremap.
	* gold.h (MREMAP_MAYMOVE): Define if HAVE_MREMAP is not defined.
	(mremap): Declare if HAVE_MREMAP is not defined.
	* configure, Makefile.in, config.in: Rebuild.

gold/ChangeLog

@@ -1,3 +1,11 @@
+2009-03-27  Ian Lance Taylor  <iant@google.com>
+
+	* mremap.c: New file.
+	* configure.ac: Call AC_REPLACE_FUNCS on mremap.
+	* gold.h (MREMAP_MAYMOVE): Define if HAVE_MREMAP is not defined.
+	(mremap): Declare if HAVE_MREMAP is not defined.
+	* configure, Makefile.in, config.in: Rebuild.
+
 2009-03-27  Cary Coutant  <ccoutant@google.com>
 
 	* powerpc.cc (Target_powerpc::check_non_pic): Assert that output is

gold/Makefile.in

@@ -50,7 +50,7 @@ DIST_COMMON = README $(am__configure_deps) $(srcdir)/../config.guess \
 	$(srcdir)/../mkinstalldirs $(srcdir)/Makefile.am \
 	$(srcdir)/Makefile.in $(srcdir)/config.in \
 	$(top_srcdir)/configure $(top_srcdir)/po/Make-in ChangeLog \
-	NEWS TODO ftruncate.c pread.c yyscript.c yyscript.h
+	NEWS TODO ftruncate.c mremap.c pread.c yyscript.c yyscript.h
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/depstand.m4 \
@@ -536,6 +536,7 @@ distclean-compile:
 	-rm -f *.tab.c
 
 @AMDEP_TRUE@@am__include@ @am__quote@$(DEPDIR)/ftruncate.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@$(DEPDIR)/mremap.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@$(DEPDIR)/pread.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/archive.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/binary.Po@am__quote@

gold/config.in

@@ -46,6 +46,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
+/* Define to 1 if you have the `mremap' function. */
+#undef HAVE_MREMAP
+
 /* Define if compiler supports #pragma omp threadprivate */
 #undef HAVE_OMP_SUPPORT
 

gold/configure

@@ -5167,7 +5167,8 @@ done
 
 
 
-for ac_func in pread ftruncate
+
+for ac_func in pread ftruncate mremap
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5

gold/configure.ac

@@ -312,7 +312,7 @@ LFS_CFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
 AC_SUBST(LFS_CFLAGS)
 
 AC_CHECK_FUNCS(chsize)
-AC_REPLACE_FUNCS(pread ftruncate)
+AC_REPLACE_FUNCS(pread ftruncate mremap)
 
 # Link in zlib if we can.  This allows us to write compressed sections.
 AC_SEARCH_LIBS(zlibVersion, z, [AC_CHECK_HEADERS(zlib.h)])

gold/gold.h

@@ -125,6 +125,11 @@ extern "C" ssize_t pread(int, void*, size_t, off_t);
 extern "C" int ftruncate(int, off_t);
 #endif
 
+#ifndef HAVE_MREMAP
+#define MREMAP_MAYMOVE 1
+extern "C" void *mremap (void *, size_t, size_t, int, ...);
+#endif
+
 namespace gold
 {
 

gold/mremap.c

@@ -0,0 +1,57 @@
+/* mremap.c -- version of mremap for gold.  */
+
+/* Copyright 2009 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor <iant@google.com>.
+
+   This file is part of gold.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include "config.h"
+#include "ansidecl.h"
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+
+/* This file implements mremap for systems which don't have it.  The
+   gold code requires support for mmap.  However, there are systems
+   which have mmap but not mremap.  This is not a general replacement
+   for mremap; it only supports the features which are required for
+   gold.  In particular, we assume that the MREMAP_MAYMOVE flag is
+   set.  */
+
+/* Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS.  */
+
+#ifndef MAP_ANONYMOUS
+# define MAP_ANONYMOUS MAP_ANON
+#endif
+
+void *
+mremap (void *old_address, size_t old_size, size_t new_size,
+	int flags ATTRIBUTE_UNUSED, ...)
+{
+  void *ret;
+
+  ret = mmap (0, new_size, PROT_READ | PROT_WRITE,
+	      MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  if (ret == MAP_FAILED)
+    return ret;
+  memcpy (ret, old_address,
+	  old_size < new_size ? old_size : new_size);
+  (void) munmap (old_address, old_size);
+  return ret;
+}