include ExtUtils::HasCompiler in repo

.gitignore

@@ -17,6 +17,5 @@
 *.c
 .*.swp
 
-/inc/
 /List-Util-*/
 /List-Util-*.tar.gz

inc/ExtUtils/HasCompiler.pm

@@ -0,0 +1,217 @@
+package ExtUtils::HasCompiler;
+$ExtUtils::HasCompiler::VERSION = '0.016';
+use strict;
+use warnings;
+
+use base 'Exporter';
+our @EXPORT_OK = qw/can_compile_loadable_object/;
+our %EXPORT_TAGS = (all => \@EXPORT_OK);
+
+use Config;
+use Carp 'carp';
+use File::Basename 'basename';
+use File::Spec::Functions qw/catfile catdir rel2abs/;
+use File::Temp qw/tempdir tempfile/;
+
+my $tempdir = tempdir('HASCOMPILERXXXX', CLEANUP => 1, DIR => '.');
+
+my $loadable_object_format = <<'END';
+#define PERL_NO_GET_CONTEXT
+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+
+#ifndef PERL_UNUSED_VAR
+#define PERL_UNUSED_VAR(var)
+#endif
+
+XS(exported) {
+#ifdef dVAR
+	dVAR;
+#endif
+	dXSARGS;
+
+	PERL_UNUSED_VAR(cv); /* -W */
+	PERL_UNUSED_VAR(items); /* -W */
+
+	XSRETURN_IV(42);
+}
+
+#ifndef XS_EXTERNAL
+#define XS_EXTERNAL(foo) XS(foo)
+#endif
+
+/* we don't want to mess with .def files on mingw */
+#if defined(WIN32) && defined(__GNUC__)
+#  define EXPORT __declspec(dllexport)
+#else
+#  define EXPORT
+#endif
+
+EXPORT XS_EXTERNAL(boot_%s) {
+#ifdef dVAR
+	dVAR;
+#endif
+	dXSARGS;
+
+	PERL_UNUSED_VAR(cv); /* -W */
+	PERL_UNUSED_VAR(items); /* -W */
+
+	newXS("%s::exported", exported, __FILE__);
+}
+
+END
+
+my $counter = 1;
+my %prelinking = map { $_ => 1 } qw/MSWin32 VMS aix/;
+
+sub can_compile_loadable_object {
+	my %args = @_;
+
+	my $output = $args{output} || \*STDOUT;
+
+	my $config = $args{config} || 'ExtUtils::HasCompiler::Config';
+	return if not $config->get('usedl');
+
+	my ($source_handle, $source_name) = tempfile('TESTXXXX', DIR => $tempdir, SUFFIX => '.c', UNLINK => 1);
+	my $basename = basename($source_name, '.c');
+
+	my $shortname = '_Loadable' . $counter++;
+	my $package = "ExtUtils::HasCompiler::$shortname";
+	printf $source_handle $loadable_object_format, $basename, $package or do { carp "Couldn't write to $source_name: $!"; return };
+	close $source_handle or do { carp "Couldn't close $source_name: $!"; return };
+
+	my $abs_basename = catfile($tempdir, $basename);
+	my $object_file = $abs_basename . $config->get('_o');
+	my $loadable_object = $abs_basename . '.' . $config->get('dlext');
+	my $incdir = catdir($config->get('archlibexp'), 'CORE');
+
+	my ($cc, $ccflags, $optimize, $cccdlflags, $ld, $ldflags, $lddlflags, $libperl, $perllibs) = map { $config->get($_) } qw/cc ccflags optimize cccdlflags ld ldflags lddlflags libperl perllibs/;
+
+	if ($prelinking{$^O}) {
+		require ExtUtils::Mksymlists;
+		ExtUtils::Mksymlists::Mksymlists(NAME => $basename, FILE => $abs_basename, IMPORTS => {});
+	}
+	my @commands;
+	if ($^O eq 'MSWin32' && $cc =~ /^cl/) {
+		push @commands, qq{$cc $ccflags $cccdlflags $optimize /I "$incdir" /c $source_name /Fo$object_file};
+		push @commands, qq{$ld $object_file $lddlflags $libperl $perllibs /out:$loadable_object /def:$abs_basename.def /pdb:$abs_basename.pdb};
+	}
+	elsif ($^O eq 'VMS') {
+		# Mksymlists is only the beginning of the story.
+		open my $opt_fh, '>>', "$abs_basename.opt" or do { carp "Couldn't append to '$abs_basename.opt'"; return };
+		print $opt_fh "PerlShr/Share\n";
+		close $opt_fh;
+
+		my $incdirs = $ccflags =~ s{ /inc[^=]+ (?:=)+ (?:\()? ( [^\/\)]* ) }{}xi ? "$1,$incdir" : $incdir;
+		push @commands, qq{$cc $ccflags $optimize /include=($incdirs) $cccdlflags $source_name /obj=$object_file};
+		push @commands, qq{$ld $ldflags $lddlflags=$loadable_object $object_file,$abs_basename.opt/OPTIONS,${incdir}perlshr_attr.opt/OPTIONS' $perllibs};
+	}
+	else {
+		my @extra;
+		if ($^O eq 'MSWin32') {
+			my $lib = '-l' . ($libperl =~ /lib([^.]+)\./)[0];
+			push @extra, "$abs_basename.def", $lib, $perllibs;
+		}
+		elsif ($^O eq 'cygwin') {
+			push @extra, catfile($incdir, $config->get('useshrplib') ? 'libperl.dll.a' : 'libperl.a');
+		}
+		elsif ($^O eq 'aix') {
+			$lddlflags =~ s/\Q$(BASEEXT)\E/$abs_basename/;
+			$lddlflags =~ s/\Q$(PERL_INC)\E/$incdir/;
+		}
+		elsif ($^O eq 'android') {
+			push @extra, qq{"-L$incdir"}, '-lperl', $perllibs;
+		}
+		push @commands, qq{$cc $ccflags $optimize "-I$incdir" $cccdlflags -c $source_name -o $object_file};
+		push @commands, qq{$ld $optimize $object_file -o $loadable_object $lddlflags @extra};
+	}
+
+	for my $command (@commands) {
+		print $output "$command\n" if not $args{quiet};
+		system $command and do { carp "Couldn't execute $command: $!"; return };
+	}
+
+	# Skip loading when cross-compiling
+	return 1 if exists $args{skip_load} ? $args{skip_load} : $config->get('usecrosscompile');
+
+	require DynaLoader;
+	local @DynaLoader::dl_require_symbols = "boot_$basename";
+	my $handle = DynaLoader::dl_load_file(rel2abs($loadable_object), 0);
+	if ($handle) {
+		my $symbol = DynaLoader::dl_find_symbol($handle, "boot_$basename") or do { carp "Couldn't find boot symbol for $basename"; return };
+		my $compilet = DynaLoader::dl_install_xsub('__ANON__::__ANON__', $symbol, $source_name);
+		my $ret = eval { $compilet->(); $package->exported } or carp $@;
+		delete $ExtUtils::HasCompiler::{"$shortname\::"};
+		eval { DynaLoader::dl_unload_file($handle) } or carp $@;
+		return defined $ret && $ret == 42;
+	}
+	else {
+		carp "Couldn't load $loadable_object: " . DynaLoader::dl_error();
+		return;
+	}
+}
+
+sub ExtUtils::HasCompiler::Config::get {
+	my (undef, $key) = @_;
+	return $ENV{uc $key} || $Config{$key};
+}
+
+1;
+
+# ABSTRACT: Check for the presence of a compiler
+
+__END__
+
+=pod
+
+=encoding UTF-8
+
+=head1 NAME
+
+ExtUtils::HasCompiler - Check for the presence of a compiler
+
+=head1 VERSION
+
+version 0.016
+
+=head1 DESCRIPTION
+
+This module tries to check if the current system is capable of compiling, linking and loading an XS module.
+
+B<Notice>: this is an early release, interface stability isn't guaranteed yet.
+
+=head1 FUNCTIONS
+
+=head2 can_compile_loadable_object(%opts)
+
+This checks if the system can compile, link and load a perl loadable object. It may take the following options:
+
+=over 4
+
+=item * quiet
+
+Do not output the executed compilation commands.
+
+=item * config
+
+An L<ExtUtils::Config|ExtUtils::Config> (compatible) object for configuration.
+
+=item * skip_load
+
+This causes can_compile_loadable_object to not try to load the generated object. This defaults to true on a cross-compiling perl.
+
+=back
+
+=head1 AUTHOR
+
+Leon Timmermans <leont@cpan.org>
+
+=head1 COPYRIGHT AND LICENSE
+
+This software is copyright (c) 2014 by Leon Timmermans.
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.
+
+=cut