#!/usr/bin/env perl

# set sefaults for all options
$var{prefix} = "/usr/local/";
$var{debug}  = "no";

if ($ENV{CC}) {$var{CC} = $ENV{CC};} else {$var{CC} = "cc";}

# print valid options
sub print_options {
    foreach $key (keys %var){
	print "\t--$key=$var{$key}\n";
    }
}
sub do_help { 
    print "\navailable options with defaults: \n";
    print_options; 
    print "\n--enable|disable-<thing> is equivalent to --<thing>=yes|no\n";
    exit(0); 
}

# override with command line args
while ($a = shift) {
    if ($a eq "--help") { do_help; }
    elsif ($a =~ m/^--enable-(.+)/) { $var{$1} = "yes"; }
    elsif ($a =~ m/^--disable-(.+)/) { $var{$1} = "no"; }
    elsif ($a =~ m/^--(.+?)=(.+)/)  { $var{$1} = $2; }
    else  {print "invalid argument ".$a."\n"; do_help;}
}


print "generating Makefile.defs\n";
open CONFIG, ">Makefile.defs";
sub config {print CONFIG shift; print CONFIG "\n";}


config "CC = $var{CC}" ;
config "PREFIX = $var{prefix}" ;

if ($var{debug} eq "yes"){
    config "DEBUG_CFLAGS = -g -Wall -Werror -W -Wstrict-prototypes -Wno-unused -Wno-parentheses -Wno-switch -g";
}
else {
    config "OPTI_CFLAGS = -O3 -fomit-frame-pointer -ffast-math -funroll-loops";
}



close CONFIG;