Remove unused file ptrdiff_max.m4.

diff --git a/ChangeLog b/ChangeLog
index 0b6e07d..4f25db5 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2006-11-28  Bruno Haible  <bruno@clisp.org>
+
+       * m4/ptrdiff_max.m4: Remove file.
+
 2006-11-21  Bruno Haible  <bruno@clisp.org>
 
        * m4/eoverflow.m4 (gl_EOVERFLOW): Use AC_COMPUTE_INT instead of

diff --git a/m4/ptrdiff_max.m4 b/m4/ptrdiff_max.m4
deleted file mode 100644 (file)
index 79e68f2..0000000
--- a/m4/ptrdiff_max.m4
+++ /dev/null
@@ -1,73 +0,0 @@
-# ptrdiff_max.m4 serial 2
-dnl Copyright (C) 2003, 2006 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
-
-dnl From Bruno Haible.
-
-AC_DEFUN([gl_PTRDIFF_MAX],
-[
-  AC_CHECK_TYPE([ptrdiff_t], ,
-    [AC_DEFINE([ptrdiff_t], [long],
-       [Define as the type of the result of subtracting two pointers, if the system doesn't define it.])
-    ])
-  AC_CHECK_HEADERS_ONCE(stdint.h)
-  dnl First test whether the system already has PTRDIFF_MAX.
-  AC_MSG_CHECKING([for PTRDIFF_MAX])
-  result=
-  AC_EGREP_CPP([Found it], [
-#include <limits.h>
-#if HAVE_STDINT_H
-#include <stdint.h>
-#endif
-#ifdef PTRDIFF_MAX
-Found it
-#endif
-], result=yes)
-  if test -z "$result"; then
-    dnl Define it ourselves. Here we assume that the type 'ptrdiff_t' is not
-    dnl wider than the type 'long'.
-    dnl The AC_COMPUTE_INT macro works up to LONG_MAX, since it uses 'expr',
-    dnl which is guaranteed to work from LONG_MIN to LONG_MAX.
-    AC_COMPUTE_INT([res], [STYPE_MAXIMUM (ptrdiff_t)], [
-#include <stddef.h>
-#include <limits.h>
-#define STYPE_MINIMUM(t) (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))
-#define STYPE_MAXIMUM(t) ((t) (~ (t) 0 - STYPE_MINIMUM (t)))
-], result=?)
-    AC_COMPUTE_INT([fits_in_int], [sizeof (ptrdiff_t) <= sizeof (int)],
-      [#include <stddef.h>], result=?)
-    if test "$fits_in_int" = 1; then
-      dnl Even though PTRDIFF_MAX fits in an int, it must be of type
-      dnl 'long' if the type 'ptrdiff_t' is the same as 'long'.
-      AC_TRY_COMPILE([#include <stddef.h>
-        extern ptrdiff_t foo;
-        extern long foo;
-        ], [], fits_in_int=0)
-    fi
-    if test -z "$result"; then
-      if test "$fits_in_int" = 1; then
-        result="$res"
-      else
-        result="$res"L
-      fi
-    else
-      dnl Shouldn't happen, but who knows...
-      result='((ptrdiff_t)(~(ptrdiff_t)0-(~(ptrdiff_t)0<<(sizeof(ptrdiff_t)*CHAR_BIT-1))))'
-    fi
-  fi
-  AC_MSG_RESULT([$result])
-  if test "$result" != yes; then
-    AC_DEFINE_UNQUOTED([PTRDIFF_MAX], [$result],
-      [Define as the maximum value of type 'ptrdiff_t', if the system doesn't define it.])
-  fi
-])
-
-dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
-dnl Remove this when we can assume autoconf >= 2.61.
-m4_ifdef([AC_COMPUTE_INT], [], [
-  AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
-])