Mercurial > ~mikael > mcabber > hg
view mcabber/macros/timezone.m4 @ 1497:35020a2ed115
Do not use srand()/rand() if better alternatives exist (mirabilos)
arc4random(3) is a self-seeding PRNG available on a lot of OSes (all BSDs,
Darwin / Mac OSX, Interix / Microsoft® Services for Unix, Windows® 2003SR1,
Windows® Vista, Debian with the new libbsd package installed, ???) and much
better than srand(3)/rand(3).
Thanks to GNU autoconf, this can be made portable.
http://www.mirbsd.org/man/arc4random.3
//mirabilos
author | Mikael Berthe <mikael@lilotux.net> |
---|---|
date | Mon, 30 Jun 2008 23:13:50 +0200 |
parents | 103764a87777 |
children |
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dnl ac_var_timeszone_externals.m4 # Define 'timezone', 'altzone' and 'daylight' # http://www.gnu.org/software/ac-archive/Miscellaneous/ac_var_timezone_externals.html # Use instead of 'AC_STRUCT_TIMEZONE' to determine whether the # the external timezone variables 'timezone', 'altzone' and 'daylight' exist, # defining 'HAVE_TIMEZONE', 'HAVE_ALTZONE' and 'HAVE_DAYLIGHT' respectively # (as well as gaining the macros defined by 'AC_STRUCT_TIMEZONE'). # Mark R.Bannister <markb@freedomware.co.uk> AC_DEFUN([AC_VAR_TIMEZONE_EXTERNALS], [ AC_REQUIRE([AC_STRUCT_TIMEZONE])dnl AC_CACHE_CHECK(for timezone external, mb_cv_var_timezone, [ AC_TRY_LINK([#include <time.h>], [return (int)timezone;], mb_cv_var_timezone=yes, mb_cv_var_timezone=no) ]) AC_CACHE_CHECK(for altzone external, mb_cv_var_altzone, [ AC_TRY_LINK([#include <time.h>], [return (int)altzone;], mb_cv_var_altzone=yes, mb_cv_var_altzone=no) ]) AC_CACHE_CHECK(for daylight external, mb_cv_var_daylight, [ AC_TRY_LINK([#include <time.h>], [return (int)daylight;], mb_cv_var_daylight=yes, mb_cv_var_daylight=no) ]) if test $mb_cv_var_timezone = yes; then AC_DEFINE([HAVE_TIMEZONE], 1, [Define if you have the external 'timezone' variable.]) fi if test $mb_cv_var_altzone = yes; then AC_DEFINE([HAVE_ALTZONE], 1, [Define if you have the external 'altzone' variable.]) fi if test $mb_cv_var_daylight = yes; then AC_DEFINE([HAVE_DAYLIGHT], 1, [Define if you have the external 'daylight' variable.]) fi ])