use ExtUtils::MakeMaker;

use 5.006;
use Cwd;

my $probe = "ffcall-probe";
my @ffcall_opts = find_ffcall();

WriteMakefile(
    'NAME'      => 'FFI',
    'AUTHOR'    => 'Paul Moore <gustav@morpheus.demon.co.uk>',
    'ABSTRACT'  => 'Foreign Function Interface for Perl',
    'VERSION_FROM' => 'FFI.pm',
    'PM'        => { 'FFI.pm' => '$(INST_LIBDIR)/FFI.pm',
                     'Library.pm' => '$(INST_LIBDIR)/FFI/Library.pm',
		   },
    'DEFINE'    => ($^O eq "MSWin32" ? '-DWIN32' : ''),
    'clean'     => { FILES => "$probe.* vc*.pdb FFI.obj FFI.o FFI_def.old" },
    @ffcall_opts,
);

exit 0;

########################################################################

sub find_ffcall {
    my $libs = '-lavcall -lcallback';

    # Always use bundled ffcall binaries on Windows.
    if ($^O eq 'MSWin32') {
        my $cwd = cwd;
        return (
            LIBS => ["-L$cwd/win32/lib $libs"],
            CCFLAGS => '-Iwin32/include',
        );
    }

    open my $fh, ">", "$probe.c" or die "open: $!";
    print $fh <<'.';
#include <callback.h>

int
main(int argv, char ** argc) {
    /* this isn't really intended to be run */
    __TR_function cb = alloc_callback(&main, 0);
    free_callback(cb);
}
.
    close $fh or die "close: $!";

    # this is probably not the cleanest way to get the CC. But I want to
    # use EU::MM in the 1.0x line of this module.
    require ExtUtils::MM;
    my $mm = MM->new({NAME => 'FFI'});

    print "$mm->{CC} $libs $probe.c 2> $probe.err\n";
    if (system "$mm->{CC} $probe.c $libs -o $probe.exe 2> $probe.err") {
        print << ".";
*** ffcall probe compilation failed. Do you have the ffcall library (and
    its development files) installed? If not, you can fetch it at:

        http://directory.fsf.org/ffcall.html

    Alternatively, your OS vendor may have made packages available for you.
    See INSTALL for suggested package names.

    The compilation error messages are available at $probe.err .

.
        # According to http://cpantest.grango.org/wiki/CPANAuthorNotes, this
        # is the preferred method of failing when library dependencies are
        # not met, so that CPAN testers do not send spurious error reports.
        exit 0;
    }

    unlink "$probe.$_" for qw(c o exe err);

    return (LIBS => [$libs]);
}