kc3-lang/gnulib/m4/memcmp.m4

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• Hash : 9fc81090
  Author :
  Date : 2013-01-01T00:50:58
  

  maint: update all copyright year number ranges
  
  Run "make update-copyright".  Compare to commit 1602f0a from last year.
  
  Signed-off-by: Eric Blake <eblake@redhat.com>
  

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• m4/memcmp.m4

• # memcmp.m4 serial 16
  dnl Copyright (C) 2002-2004, 2007-2013 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([gl_FUNC_MEMCMP],
  [
    dnl We don't use AC_FUNC_MEMCMP any more, because it is no longer maintained
    dnl in Autoconf and because it invokes AC_LIBOBJ.
    AC_CACHE_CHECK([for working memcmp], [gl_cv_func_memcmp_working],
      [AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
            [AC_INCLUDES_DEFAULT],
            [[/* Some versions of memcmp are not 8-bit clean.  */
              char c0 = '\100', c1 = '\200', c2 = '\201';
              if (memcmp(&c0, &c2, 1) >= 0 || memcmp(&c1, &c2, 1) >= 0)
                return 1;
              /* The Next x86 OpenStep bug shows up only when comparing 16 bytes
                 or more and with at least one buffer not starting on a 4-byte
                 boundary.  William Lewis provided this test program.   */
              {
                char foo[21];
                char bar[21];
                int i;
                for (i = 0; i < 4; i++)
                  {
                    char *a = foo + i;
                    char *b = bar + i;
                    strcpy (a, "--------01111111");
                    strcpy (b, "--------10000000");
                    if (memcmp (a, b, 16) >= 0)
                      return 1;
                  }
                return 0;
              }
            ]])],
         [gl_cv_func_memcmp_working=yes],
         [gl_cv_func_memcmp_working=no],
         [dnl When cross-compiling, guess memcmp works when it exists.
          dnl This is useful for mingw.
          AC_LINK_IFELSE(
            [AC_LANG_PROGRAM(
               [[#include <string.h>]],
               [[int ret = memcmp ("foo", "bar", 0);]])],
            [gl_cv_func_memcmp_working="guessing yes"],
            [gl_cv_func_memcmp_working="guessing no"])
         ])
      ])
    case "$gl_cv_func_memcmp_working" in
      *yes) gl_func_memcmp=yes ;;
      *)    gl_func_memcmp=no ;;
    esac
    if test $gl_func_memcmp = no; then
      AC_DEFINE([memcmp], [rpl_memcmp],
        [Define to rpl_memcmp if the replacement function should be used.])
    fi
  ])
  
  # Prerequisites of lib/memcmp.c.
  AC_DEFUN([gl_PREREQ_MEMCMP], [:])
  

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