Mercurial > ~mikael > mcabber > hg
view mcabber/macros/define_dir.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 | 618967a008a2 |
children |
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dnl define_dir.m4 dnl http://autoconf-archive.cryp.to/ac_define_dir.html # AC_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION]) # This macro sets VARNAME to the expansion of the DIR variable, taking care # of fixing up ${prefix} and such. # VARNAME is then offered as both an output variable and a C preprocessor # symbol. # Authors # Stepan Kasal <kasal@ucw.cz>, Andreas Schwab <schwab@suse.de>, # Guido Draheim <guidod@gmx.de>, Alexandre Oliva # (Slightly modified -- Mikael Berthe) AC_DEFUN([AC_DEFINE_DIR], [ prefix_NONE= exec_prefix_NONE= test "x$prefix" = xNONE && prefix_NONE=yes && prefix=$ac_default_prefix test "x$exec_prefix" = xNONE && exec_prefix_NONE=yes && exec_prefix=$prefix dnl In Autoconf 2.60, ${datadir} refers to ${datarootdir}, which in turn dnl refers to ${prefix}. Thus we have to use `eval' twice. ac_define_dir=`eval echo [$]$2` ac_define_dir=`eval echo [$]ac_define_dir` AC_SUBST($1, "$ac_define_dir") ifelse($3, , AC_DEFINE_UNQUOTED($1, "$ac_define_dir"), AC_DEFINE_UNQUOTED($1, "$ac_define_dir", $3)) test "$prefix_NONE" && prefix=NONE test "$exec_prefix_NONE" && exec_prefix=NONE ])