-# serial 12
+# serial 20
-# Copyright (C) 2001-2003, 2005, 2007, 2009 Free Software Foundation, Inc.
+# Copyright (C) 2001-2003, 2005, 2007, 2009-2012 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.
[
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])
- 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 (*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],
- [gl_cv_func_gettimeofday_posix_signature=no])])
-
- gl_FUNC_GETTIMEOFDAY_CLOBBER
-
- if test $gl_cv_func_gettimeofday_posix_signature != yes; then
- REPLACE_GETTIMEOFDAY=1
- SYS_TIME_H=sys/time.h
- if test $gl_cv_func_gettimeofday_clobber != yes; then
- AC_LIBOBJ([gettimeofday])
- gl_PREREQ_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], [$gl_gettimeofday_timezone],
+ [Define this to 'void' or 'struct timezone' to match the system's
+ declaration of the second argument to gettimeofday.])
])
AC_DEFUN([gl_FUNC_GETTIMEOFDAY_CLOBBER],
[
AC_REQUIRE([gl_HEADER_SYS_TIME_H])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
[gl_cv_func_gettimeofday_clobber],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
- [[#include <string.h>
- #include <sys/time.h>
- #include <time.h>
- #include <stdlib.h>
- ]],
- [[
- time_t t = 0;
- struct tm *lt;
- struct tm saved_lt;
- struct timeval tv;
- lt = localtime (&t);
- saved_lt = *lt;
- gettimeofday (&tv, NULL);
- return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0;
- ]])],
+ [[#include <string.h>
+ #include <sys/time.h>
+ #include <time.h>
+ #include <stdlib.h>
+ ]],
+ [[
+ time_t t = 0;
+ struct tm *lt;
+ struct tm saved_lt;
+ struct timeval tv;
+ lt = localtime (&t);
+ saved_lt = *lt;
+ gettimeofday (&tv, NULL);
+ return memcmp (lt, &saved_lt, sizeof (struct tm)) != 0;
+ ]])],
[gl_cv_func_gettimeofday_clobber=no],
[gl_cv_func_gettimeofday_clobber=yes],
- dnl When crosscompiling, assume it is broken.
- [gl_cv_func_gettimeofday_clobber=yes])])
+ [# When cross-compiling:
+ case "$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
+ ])])
- if test $gl_cv_func_gettimeofday_clobber = yes; then
- REPLACE_GETTIMEOFDAY=1
- SYS_TIME_H=sys/time.h
- gl_GETTIMEOFDAY_REPLACE_LOCALTIME
- AC_DEFINE([GETTIMEOFDAY_CLOBBERS_LOCALTIME], [1],
- [Define if gettimeofday clobbers the localtime buffer.])
- fi
+ case "$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])
- gl_PREREQ_GETTIMEOFDAY
AC_DEFINE([gmtime], [rpl_gmtime],
[Define to rpl_gmtime if the replacement function should be used.])
AC_DEFINE([localtime], [rpl_localtime],