-#serial 4
+# serial 21
+
+# Copyright (C) 2001-2003, 2005, 2007, 2009-2013 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
+
+AC_DEFUN([gl_FUNC_GETTIMEOFDAY],
+[
+ AC_REQUIRE([AC_C_RESTRICT])
+ AC_REQUIRE([gl_HEADER_SYS_TIME_H])
+ AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([gettimeofday])
+
+ gl_gettimeofday_timezone=void
+ if test $ac_cv_func_gettimeofday != yes; then
+ HAVE_GETTIMEOFDAY=0
+ else
+ gl_FUNC_GETTIMEOFDAY_CLOBBER
+ AC_CACHE_CHECK([for gettimeofday with POSIX signature],
+ [gl_cv_func_gettimeofday_posix_signature],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/time.h>
+ struct timeval c;
+ int gettimeofday (struct timeval *restrict, void *restrict);
+ ]],
+ [[/* glibc uses struct timezone * rather than the POSIX void *
+ if _GNU_SOURCE is defined. However, since the only portable
+ use of gettimeofday uses NULL as the second parameter, and
+ since the glibc definition is actually more typesafe, it is
+ not worth wrapping this to get a compliant signature. */
+ int (*f) (struct timeval *restrict, void *restrict)
+ = gettimeofday;
+ int x = f (&c, 0);
+ return !(x | c.tv_sec | c.tv_usec);
+ ]])],
+ [gl_cv_func_gettimeofday_posix_signature=yes],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/time.h>
+int gettimeofday (struct timeval *restrict, struct timezone *restrict);
+ ]])],
+ [gl_cv_func_gettimeofday_posix_signature=almost],
+ [gl_cv_func_gettimeofday_posix_signature=no])])])
+ if test $gl_cv_func_gettimeofday_posix_signature = almost; then
+ gl_gettimeofday_timezone='struct timezone'
+ elif test $gl_cv_func_gettimeofday_posix_signature != yes; then
+ REPLACE_GETTIMEOFDAY=1
+ fi
+ dnl If we override 'struct timeval', we also have to override gettimeofday.
+ if test $REPLACE_STRUCT_TIMEVAL = 1; then
+ REPLACE_GETTIMEOFDAY=1
+ fi
+ m4_ifdef([gl_FUNC_TZSET_CLOBBER], [
+ gl_FUNC_TZSET_CLOBBER
+ case "$gl_cv_func_tzset_clobber" in
+ *yes)
+ REPLACE_GETTIMEOFDAY=1
+ gl_GETTIMEOFDAY_REPLACE_LOCALTIME
+ AC_DEFINE([tzset], [rpl_tzset],
+ [Define to rpl_tzset if the wrapper function should be used.])
+ AC_DEFINE([TZSET_CLOBBERS_LOCALTIME], [1],
+ [Define if tzset clobbers localtime's static buffer.])
+ ;;
+ esac
+ ])
+ fi
+ AC_DEFINE_UNQUOTED([GETTIMEOFDAY_TIMEZONE], [$gl_gettimeofday_timezone],
+ [Define this to 'void' or 'struct timezone' to match the system's
+ declaration of the second argument to gettimeofday.])
+])
+
+
dnl See if gettimeofday clobbers the static buffer that localtime uses
-dnl for it's return value. The gettimeofday function from Mac OS X 10.0.4,
-dnl i.e. Darwin 1.3.7 has this problem.
+dnl for its return value. The gettimeofday function from Mac OS X 10.0.4
+dnl (i.e., Darwin 1.3.7) has this problem.
dnl
dnl If it does, then arrange to use gettimeofday and localtime only via
dnl the wrapper functions that work around the problem.
-AC_DEFUN([AC_FUNC_GETTIMEOFDAY_CLOBBER],
+AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],
[
- AC_REQUIRE([AC_HEADER_TIME])
- AC_CHECK_HEADERS_ONCE(stdlib.h string.h)
- AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
- jm_cv_func_gettimeofday_clobber,
- [AC_TRY_RUN([
-#include <stdio.h>
-#if HAVE_STRING_H
-# include <string.h>
-#endif
-
-#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
-
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+ AC_REQUIRE([gl_HEADER_SYS_TIME_H])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
-int
-main ()
-{
- time_t t = 0;
- struct tm *lt;
- struct tm saved_lt;
- struct timeval tv;
- lt = localtime (&t);
- saved_lt = *lt;
- gettimeofday (&tv, NULL);
- if (memcmp (lt, &saved_lt, sizeof (struct tm)) != 0)
- exit (1);
-
- exit (0);
-}
- ],
- jm_cv_func_gettimeofday_clobber=no,
- jm_cv_func_gettimeofday_clobber=yes,
- dnl When crosscompiling, assume it is broken.
- jm_cv_func_gettimeofday_clobber=yes)
- ])
- if test $jm_cv_func_gettimeofday_clobber = yes; then
- gl_GETTIMEOFDAY_REPLACE_LOCALTIME
+ AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
+ [gl_cv_func_gettimeofday_clobber],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+ #include <sys/time.h>
+ #include <time.h>
+ #include <stdlib.h>
+ ]],
+ [[
+ time_t t = 0;
+ struct tm *lt;
+ struct tm saved_lt;
+ struct timeval tv;
+ lt = localtime (&t);
+ saved_lt = *lt;
+ gettimeofday (&tv, NULL);
+ return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0;
+ ]])],
+ [gl_cv_func_gettimeofday_clobber=no],
+ [gl_cv_func_gettimeofday_clobber=yes],
+ [# When cross-compiling:
+ case "$host_os" in
+ # Guess all is fine on glibc systems.
+ *-gnu*) gl_cv_func_gettimeofday_clobber="guessing no" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_gettimeofday_clobber="guessing yes" ;;
+ esac
+ ])])
- AC_DEFINE(gettimeofday, rpl_gettimeofday,
- [Define to rpl_gettimeofday if the replacement function should be used.])
- AC_DEFINE(GETTIMEOFDAY_CLOBBERS_LOCALTIME_BUFFER, 1,
- [Define if gettimeofday clobbers localtime's static buffer.])
- gl_PREREQ_GETTIMEOFDAY
- fi
+ case "$gl_cv_func_gettimeofday_clobber" in
+ *yes)
+ REPLACE_GETTIMEOFDAY=1
+ gl_GETTIMEOFDAY_REPLACE_LOCALTIME
+ AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1],
+ [Define if gettimeofday clobbers the localtime buffer.])
+ ;;
+ esac
])
AC_DEFUN([gl_GETTIMEOFDAY_REPLACE_LOCALTIME], [
- AC_LIBOBJ(gettimeofday)
- AC_DEFINE(gmtime, rpl_gmtime,
- [Define to rpl_gmtime if the replacement function should be used.])
- AC_DEFINE(localtime, rpl_localtime,
- [Define to rpl_localtime if the replacement function should be used.])
+ REPLACE_GMTIME=1
+ REPLACE_LOCALTIME=1
])
# Prerequisites of lib/gettimeofday.c.
AC_DEFUN([gl_PREREQ_GETTIMEOFDAY], [
- AC_REQUIRE([AC_HEADER_TIME])
+ AC_CHECK_HEADERS([sys/timeb.h])
+ AC_CHECK_FUNCS([_ftime])
])
projects / gnulib.git / blobdiff