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81 lines
2.1 KiB
Plaintext
81 lines
2.1 KiB
Plaintext
#serial 7
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# Copyright (C) 2001, 2002, 2003, 2005 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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dnl
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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([AC_FUNC_GETTIMEOFDAY_CLOBBER],
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[
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AC_REQUIRE([AC_HEADER_TIME])
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AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
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jm_cv_func_gettimeofday_clobber,
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[AC_TRY_RUN([
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#include <stdio.h>
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#include <string.h>
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include <stdlib.h>
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int
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main ()
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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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if (memcmp (lt, &saved_lt, sizeof (struct tm)) != 0)
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exit (1);
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exit (0);
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}
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],
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jm_cv_func_gettimeofday_clobber=no,
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jm_cv_func_gettimeofday_clobber=yes,
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dnl When crosscompiling, assume it is broken.
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jm_cv_func_gettimeofday_clobber=yes)
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])
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if test $jm_cv_func_gettimeofday_clobber = yes; then
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gl_GETTIMEOFDAY_REPLACE_LOCALTIME
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AC_DEFINE(gettimeofday, rpl_gettimeofday,
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[Define to rpl_gettimeofday if the replacement function should be used.])
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gl_PREREQ_GETTIMEOFDAY
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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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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_REQUIRE([AC_HEADER_TIME])
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])
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