File Coverage

blib/lib/Module/Install/Can.pm

Criterion	Covered	Total	%
statement	18	72	25.0
branch	0	20	0.0
condition	0	11	0.0
subroutine	6	10	60.0
pod	4	4	100.0
total	28	117	23.9

package Module::Install::Can;

use strict;
use Config                ();
use ExtUtils::MakeMaker   ();
use Module::Install::Base ();

use vars qw{$VERSION @ISA $ISCORE};
BEGIN {
	$VERSION = '1.19';
	@ISA     = 'Module::Install::Base';
	$ISCORE  = 1;
}

# check if we can load some module
### Upgrade this to not have to load the module if possible
sub can_use {
	my ($self, $mod, $ver) = @_;
	$mod =~ s{::|\\}{/}g;
	$mod .= '.pm' unless $mod =~ /\.pm$/i;

	my $pkg = $mod;
	$pkg =~ s{/}{::}g;
	$pkg =~ s{\.pm$}{}i;

	local $@;
	eval { require $mod; $pkg->VERSION($ver || 0); 1 };
}

# Check if we can run some command
sub can_run {
	my ($self, $cmd) = @_;

	my $_cmd = $cmd;
	return $_cmd if (-x $_cmd or $_cmd = MM->maybe_command($_cmd));

	for my $dir ((split /$Config::Config{path_sep}/, $ENV{PATH}), '.') {
		next if $dir eq '';
		require File::Spec;
		my $abs = File::Spec->catfile($dir, $cmd);
		return $abs if (-x $abs or $abs = MM->maybe_command($abs));
	}

	return;
}

# Can our C compiler environment build XS files
sub can_xs {
	my $self = shift;

	# Ensure we have the CBuilder module
	$self->configure_requires( 'ExtUtils::CBuilder' => 0.27 );

	# Do we have the configure_requires checker?
	local $@;
	eval "require ExtUtils::CBuilder;";
	if ( $@ ) {
		# They don't obey configure_requires, so it is
		# someone old and delicate. Try to avoid hurting
		# them by falling back to an older simpler test.
		return $self->can_cc();
	}

	# Do we have a working C compiler
	my $builder = ExtUtils::CBuilder->new(
		quiet => 1,
	);
	unless ( $builder->have_compiler ) {
		# No working C compiler
		return 0;
	}

	# Write a C file representative of what XS becomes
	require File::Temp;
	my ( $FH, $tmpfile ) = File::Temp::tempfile(
		"compilexs-XXXXX",
		SUFFIX => '.c',
	);
	binmode $FH;
	print $FH <<'END_C';
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

int main(int argc, char **argv) {
    return 0;
}

int boot_sanexs() {
    return 1;
}

END_C
	close $FH;

	# Can the C compiler access the same headers XS does
	my @libs   = ();
	my $object = undef;
	eval {
		local $^W = 0;
		$object = $builder->compile(
			source => $tmpfile,
		);
		@libs = $builder->link(
			objects     => $object,
			module_name => 'sanexs',
		);
	};
	my $result = $@ ? 0 : 1;

	# Clean up all the build files
	foreach ( $tmpfile, $object, @libs ) {
		next unless defined $_;
		1 while unlink;
	}

	return $result;
}

# Can we locate a (the) C compiler
sub can_cc {
	my $self   = shift;

	if ($^O eq 'VMS') {
		require ExtUtils::CBuilder;
		my $builder = ExtUtils::CBuilder->new(
		quiet => 1,
		);
		return $builder->have_compiler;
	}

	my @chunks = split(/ /, $Config::Config{cc}) or return;

	# $Config{cc} may contain args; try to find out the program part
	while (@chunks) {
		return $self->can_run("@chunks") || (pop(@chunks), next);
	}

	return;
}

# Fix Cygwin bug on maybe_command();
if ( $^O eq 'cygwin' ) {
	require ExtUtils::MM_Cygwin;
	require ExtUtils::MM_Win32;
	if ( ! defined(&ExtUtils::MM_Cygwin::maybe_command) ) {
		*ExtUtils::MM_Cygwin::maybe_command = sub {
			my ($self, $file) = @_;
			if ($file =~ m{^/cygdrive/}i and ExtUtils::MM_Win32->can('maybe_command')) {
				ExtUtils::MM_Win32->maybe_command($file);
			} else {
				ExtUtils::MM_Unix->maybe_command($file);
			}
		}
	}
}

1;

__END__