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102 lines
2.9 KiB
Plaintext
102 lines
2.9 KiB
Plaintext
# serial 12
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# Copyright (C) 2001-2003, 2005, 2007, 2009 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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dnl From Jim Meyering.
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AC_DEFUN([gl_FUNC_GETTIMEOFDAY],
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[
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AC_REQUIRE([AC_C_RESTRICT])
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AC_REQUIRE([gl_HEADER_SYS_TIME_H])
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AC_CHECK_FUNCS_ONCE([gettimeofday])
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AC_CACHE_CHECK([for gettimeofday with POSIX signature],
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[gl_cv_func_gettimeofday_posix_signature],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <sys/time.h>
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struct timeval c;
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]],
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[[
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int (*f) (struct timeval *restrict, void *restrict) = gettimeofday;
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int x = f (&c, 0);
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return !(x | c.tv_sec | c.tv_usec);
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]])],
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[gl_cv_func_gettimeofday_posix_signature=yes],
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[gl_cv_func_gettimeofday_posix_signature=no])])
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gl_FUNC_GETTIMEOFDAY_CLOBBER
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if test $gl_cv_func_gettimeofday_posix_signature != yes; then
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REPLACE_GETTIMEOFDAY=1
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SYS_TIME_H=sys/time.h
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if test $gl_cv_func_gettimeofday_clobber != yes; then
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AC_LIBOBJ([gettimeofday])
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gl_PREREQ_GETTIMEOFDAY
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fi
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fi
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])
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dnl See if gettimeofday clobbers the static buffer that localtime uses
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dnl for its return value. The gettimeofday function from Mac OS X 10.0.4
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dnl (i.e., Darwin 1.3.7) has this problem.
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dnl
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dnl If it does, then arrange to use gettimeofday and localtime only via
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dnl the wrapper functions that work around the problem.
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AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],
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[
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AC_REQUIRE([gl_HEADER_SYS_TIME_H])
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AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
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[gl_cv_func_gettimeofday_clobber],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <string.h>
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#include <sys/time.h>
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#include <time.h>
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#include <stdlib.h>
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]],
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[[
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time_t t = 0;
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struct tm *lt;
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struct tm saved_lt;
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struct timeval tv;
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lt = localtime (&t);
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saved_lt = *lt;
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gettimeofday (&tv, NULL);
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return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0;
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]])],
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[gl_cv_func_gettimeofday_clobber=no],
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[gl_cv_func_gettimeofday_clobber=yes],
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dnl When crosscompiling, assume it is broken.
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[gl_cv_func_gettimeofday_clobber=yes])])
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if test $gl_cv_func_gettimeofday_clobber = yes; then
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REPLACE_GETTIMEOFDAY=1
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SYS_TIME_H=sys/time.h
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gl_GETTIMEOFDAY_REPLACE_LOCALTIME
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AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1],
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[Define if gettimeofday clobbers the localtime buffer.])
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fi
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])
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AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
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AC_LIBOBJ([gettimeofday])
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gl_PREREQ_GETTIMEOFDAY
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AC_DEFINE([gmtime], [rpl_gmtime],
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[Define to rpl_gmtime if the replacement function should be used.])
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AC_DEFINE([localtime], [rpl_localtime],
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[Define to rpl_localtime if the replacement function should be used.])
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])
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# Prerequisites of lib/gettimeofday.c.
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AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [
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AC_CHECK_HEADERS([sys/timeb.h])
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AC_CHECK_FUNCS([_ftime])
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])
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