Merge GDB 7.5.1

gdb/gnulib/m4/memchr.m4

Index: gdb/gnulib/m4/memchr.m4
diff --git a/gdb/gnulib/m4/memchr.m4 b/gdb/gnulib/m4/memchr.m4
deleted file mode 100644
index b2b09bdc3374c127da9c1993044f244ef13c691b..0000000000000000000000000000000000000000
--- a/gdb/gnulib/m4/memchr.m4
+++ /dev/null
@@ -1,85 +0,0 @@
-# memchr.m4 serial 8
-dnl Copyright (C) 2002-2004, 2009-2011 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
-[
-  dnl Check for prerequisites for memory fence checks.
-  gl_FUNC_MMAP_ANON
-  AC_CHECK_HEADERS_ONCE([sys/mman.h])
-  AC_CHECK_FUNCS_ONCE([mprotect])
-
-  dnl These days, we assume memchr is present.  But just in case...
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
-  AC_CHECK_FUNCS_ONCE([memchr])
-  if test $ac_cv_func_memchr = yes; then
-    # Detect platform-specific bugs in some versions of glibc:
-    # memchr should not dereference anything with length 0
-    #   http://bugzilla.redhat.com/499689
-    # memchr should not dereference overestimated length after a match
-    #   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737
-    #   http://sourceware.org/bugzilla/show_bug.cgi?id=10162
-    # Assume that memchr works on platforms that lack mprotect.
-    AC_CACHE_CHECK([whether memchr works], [gl_cv_func_memchr_works],
-      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
-#include <string.h>
-#if HAVE_SYS_MMAN_H
-# include <fcntl.h>
-# include <unistd.h>
-# include <sys/types.h>
-# include <sys/mman.h>
-# ifndef MAP_FILE
-#  define MAP_FILE 0
-# endif
-#endif
-]], [[
-  char *fence = NULL;
-#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
-# if HAVE_MAP_ANONYMOUS
-  const int flags = MAP_ANONYMOUS | MAP_PRIVATE;
-  const int fd = -1;
-# else /* !HAVE_MAP_ANONYMOUS */
-  const int flags = MAP_FILE | MAP_PRIVATE;
-  int fd = open ("/dev/zero", O_RDONLY, 0666);
-  if (fd >= 0)
-# endif
-    {
-      int pagesize = getpagesize ();
-      char *two_pages =
-        (char *) mmap (NULL, 2 * pagesize, PROT_READ | PROT_WRITE,
-                       flags, fd, 0);
-      if (two_pages != (char *)(-1)
-          && mprotect (two_pages + pagesize, pagesize, PROT_NONE) == 0)
-        fence = two_pages + pagesize;
-    }
-#endif
-  if (fence)
-    {
-      if (memchr (fence, 0, 0))
-        return 1;
-      strcpy (fence - 9, "12345678");
-      if (memchr (fence - 9, 0, 79) != fence - 1)
-        return 2;
-    }
-  return 0;
-]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no],
-      [dnl Be pessimistic for now.
-       gl_cv_func_memchr_works="guessing no"])])
-    if test "$gl_cv_func_memchr_works" != yes; then
-      REPLACE_MEMCHR=1
-    fi
-  else
-    HAVE_MEMCHR=0
-  fi
-  if test $HAVE_MEMCHR = 0 || test $REPLACE_MEMCHR = 1; then
-    AC_LIBOBJ([memchr])
-    gl_PREREQ_MEMCHR
-  fi
-])
-
-# Prerequisites of lib/memchr.c.
-AC_DEFUN([gl_PREREQ_MEMCHR], [
-  AC_CHECK_HEADERS([bp-sym.h])
-])