timespec.m4

来自「Linux下文件工具。」· M4 代码 · 共 35 行

#serial 5

dnl From Jim Meyering

dnl Define HAVE_STRUCT_TIMESPEC if `struct timespec' is declared
dnl in time.h or sys/time.h.

AC_DEFUN([jm_CHECK_TYPE_STRUCT_TIMESPEC],
[
  AC_REQUIRE([AC_HEADER_TIME])
  AC_CACHE_CHECK([for struct timespec], fu_cv_sys_struct_timespec,
    [AC_TRY_COMPILE(
      [
#      if TIME_WITH_SYS_TIME
#       include <sys/time.h>
#       include <time.h>
#      else
#       if HAVE_SYS_TIME_H
#        include <sys/time.h>
#       else
#        include <time.h>
#       endif
#      endif
      ],
      [static struct timespec x; x.tv_sec = x.tv_nsec;],
      fu_cv_sys_struct_timespec=yes,
      fu_cv_sys_struct_timespec=no)
    ])

  if test $fu_cv_sys_struct_timespec = yes; then
    AC_DEFINE(HAVE_STRUCT_TIMESPEC, 1,
	      [Define if struct timespec is declared in <time.h>. ])
  fi
])