XS versions of the most common readsers

[gitmo/Class-MOP.git] / Makefile.PL

diff --git a/Makefile.PL b/Makefile.PL
index 402ba0a..4fdf335 100644 (file)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -1,13 +1,123 @@
+# The perl/C checking voodoo is mostly stolen from Graham Barr's
+# Scalar-List-Utils distribution.
+use strict;
+use warnings;
+
 use ExtUtils::MakeMaker;
-WriteMakefile(
-    NAME         => 'Class::MOP',
-    VERSION_FROM => 'lib/Class/MOP.pm', 
-    PREREQ_PM    => {
-        'Test::More'      => 0,
-        'Test::Exception' => 0,
-        'Scalar::Util'    => 0,
-        'Carp'            => 0,
-        'B'               => 0,
-        'Sub::Name'       => 0,        
-    }
+use Config qw(%Config);
+use File::Spec;
+
+# If undefined, try our best, if true, require XS, if false, never do
+# XS
+my $force_xs;
+
+for (@ARGV) {
+    /^--pm/ and $force_xs = 0;
+    /^--xs/ and $force_xs = 1;
+}
+
+my $has_compiler = $force_xs;
+unless ( defined $force_xs ) {
+    $has_compiler = check_for_compiler()
+        or no_cc();
+}
+
+my %prereqs = (
+    'Scalar::Util'  => '1.18',
+    'Sub::Name'     => '0.02',
+    'Sub::Identify' => '0.03',
+    'MRO::Compat'   => '0.05',
+    'Carp'          => 0,
+    'Devel::GlobalDestruction' => 0,
 );
+
+delete @prereqs{qw(Sub::Name Devel::GlobalDestruction)}
+    unless $has_compiler;
+
+write_makefile();
+
+sub write_makefile {
+    my $ccflags = -d '.svn' || $ENV{MAINTAINER_MODE} ? '-Wall' : '';
+
+    WriteMakefile(
+        VERSION_FROM  => 'lib/Class/MOP.pm',
+        NAME          => 'Class::MOP',
+        PREREQ_PM     => \%prereqs,
+        CONFIGURE     => \&init,
+        CCFLAGS       => $ccflags,
+        clean         => { FILES => 'test.c test.o' },
+        ABSTRACT_FROM => 'lib/Class/MOP.pm',
+        AUTHOR        => 'Stevan Little <stevan@iinteractive.com>',
+        LICENSE       => 'perl',
+    );
+}
+
+sub no_cc {
+    print <<'EOF';
+
+ I cannot determine if you have a C compiler
+ so I will install a perl-only implementation
+
+ You can force installation of the XS version with
+
+    perl Makefile.PL --xs
+
+EOF
+}
+
+sub check_for_compiler {
+    print "Testing if you have a C compiler\n";
+
+    eval { require ExtUtils::CBuilder };
+    if ($@) {
+        return _check_for_compiler_manually();
+    }
+    else {
+        return _check_for_compiler_with_cbuilder();
+    }
+}
+
+sub _check_for_compiler_with_cbuilder {
+    my $cb = ExtUtils::CBuilder->new( quiet => 1 );
+
+    return $cb->have_compiler();
+}
+
+sub _check_for_compiler_manually {
+    unless ( open F, '>', 'test.c' ) {
+        warn
+            "Cannot write test.c, skipping test compilation and installing pure Perl version.\n";
+        return 0;
+    }
+
+    print F <<'EOF';
+int main() { return 0; }
+EOF
+
+    close F or return 0;
+
+    my $cc = $Config{cc};
+    if ( $cc =~ /cl(\.exe)?$/ ) {
+
+        # stupid stupid MSVC compiler hack tacken from version.pm's
+        # Makefile.PL
+        $cc .= ' -c';    # prevent it from calling the linker
+    }
+
+    system("$cc -o test$Config{obj_ext} test.c") and return 0;
+
+    unlink $_ for grep {-f} 'test.c', "test$Config{obj_ext}";
+
+    return 1;
+}
+
+# This is EUMM voodoo
+sub init {
+    my $hash = $_[1];
+
+    unless ($has_compiler) {
+        @{$hash}{ 'XS', 'C' } = ( {}, [] );
+    }
+
+    $hash;
+}