use ExtUtils::MakeMaker;
use Config;
#require 5.008008;

our %args = map { split /\s*=\s*/ } @ARGV;
our $LIBS = $args{ LIBS } || "-lmpfr -lgmp";
our $INC = $args{ INC };

$use_64_bit_int = 0; # Let perl decide whether to include 64-bit 'long long' support
$use_long_double = 0;# Let perl decide whether to include 'long double' support

#$use_64_bit_int = -1; # Force exclusion of 64-bit 'long long' support
#$use_long_double = -1;# Force exclusion of 'long double' support

#$use_64_bit_int = 1; # Force inclusion of 64-bit 'long long' support
#$use_long_double = 1;# Force inclusion of 'long double' support

$have_decimal64 = 0;
for(@ARGV) {
  $have_decimal64 = 1 if $_ eq 'D64=1';
}
#$have_decimal64 = 1; # Force inclusion of _Decimal64 support
                      # This will also define MPFR_WANT_DECIMAL_FLOATS

my $d64_message = $have_decimal64 ? "Attempting to build with _Decimal64 support\n"
                                  : "Building without _Decimal64 support\n";

my $defines = $] < 5.008 ? "-DOLDPERL" : "-DNEWPERL";

if($use_64_bit_int == -1) {}                                
elsif($use_64_bit_int == 1) {$defines .= " -DUSE_64_BIT_INT"}
else {
  unless($Config::Config{ivsize} < 8) {
    $defines .= " -DUSE_64_BIT_INT";
  }
}

if($use_long_double == -1) {}
elsif($use_long_double == 1) {$defines .= " -DUSE_LONG_DOUBLE"}
else {
  if($Config::Config{nvsize} > 8 ) {
    $defines .= " -DUSE_LONG_DOUBLE";
  }
}

$defines .= " -DMPFR_WANT_DECIMAL_FLOATS" if $have_decimal64;

print "\nThis module requires the following C libraries:\n";
print " gmp-4.2.0 (or later)\n mpfr-2.4.0 (or later)\n\n";
$defines =~ /-DUSE_64_BIT_INT/ ? print "Building with 64-bit'long long' support\n" :
                                 print "Building without 64-bit 'long long' support\n";

print "If this is wrong, see the \"64-bit support\" section in the README\n\n";

$defines =~ /-DUSE_LONG_DOUBLE/ ? print "Building with 'long double' support\n" :
                                 print "Building without 'long double' support\n";

print "If this is wrong, see the \"64-bit support\" section in the README\n\n";

print "\n$d64_message";
print "If this is wrong, see the \"Decimal64 conversion\" section in the README\n\n";

my %options = (       
  NAME => 'Math::MPFR',
  AUTHOR => 'Sisyphus (sisyphus at (@) cpan dot (.) org)',
  ABSTRACT => 'Perl interface to the MPFR (floating point) library',
  DEFINE   => $defines,
  LIBS => [
    '-lmpfr -lgmp'
  ],
  VERSION_FROM => 'MPFR.pm',
  clean   => { FILES => 'out1.txt out2.txt out3.txt out4.txt out5.txt out6.txt out7.txt save_child_setting.txt' },
);

$options{PREREQ_PM} = {'Math::Decimal64' => '0.01'} if $have_decimal64;

WriteMakefile(%options);

# Remove the Makefile dependency. Causes problems on a few systems.
sub MY::makefile { '' }