utimbuf.m4

来自「gnu tar 源码包。 tar 软件是 Unix 系统下的一个打包软件」· M4 代码 · 共 40 行

#serial 8

# Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2007 Free Software
# Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

dnl From Jim Meyering

dnl Define HAVE_STRUCT_UTIMBUF if `struct utimbuf' is declared --
dnl usually in <utime.h>.
dnl Some systems have utime.h but don't declare the struct anywhere.

AC_DEFUN([gl_CHECK_TYPE_STRUCT_UTIMBUF],
[
  AC_CHECK_HEADERS_ONCE(sys/time.h utime.h)
  AC_CACHE_CHECK([for struct utimbuf], [gl_cv_sys_struct_utimbuf],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM(
	  [[#if HAVE_SYS_TIME_H
	     #include <sys/time.h>
	    #endif
	    #include <time.h>
	    #ifdef HAVE_UTIME_H
	     #include <utime.h>
	    #endif
	  ]],
	  [[static struct utimbuf x; x.actime = x.modtime;]])],
       [gl_cv_sys_struct_utimbuf=yes],
       [gl_cv_sys_struct_utimbuf=no])])

  if test $gl_cv_sys_struct_utimbuf = yes; then
    AC_DEFINE(HAVE_STRUCT_UTIMBUF, 1,
      [Define if struct utimbuf is declared -- usually in <utime.h>.
       Some systems have utime.h but don't declare the struct anywhere. ])
  fi
])