introduce support for sdkroot and sysroot to support cross-builds

To allow building for another location rather the final install prefix,
regardless whether chroot based builds, cross-compile or canadian cross sdk
is the goal, realize the difference between prefix, the sdk-root and the
system root for final target.

Signed-off-by: Jens Rehsack <sno@netbsd.org>

Configure.pl

@@ -29,6 +29,7 @@
 
     my %options;
     GetOptions(\%options, 'help!', 'prefix=s',
+               'sysroot=s', 'sdkroot=s',
                'backends=s',
                'no-clean',
                'with-parrot=s', 'gen-parrot:s', 'parrot-config=s', 'parrot-option=s@',
@@ -82,9 +83,16 @@
         $default_backend = 'moar';
     }
 
+    # XXX mkpath instead?
     mkdir($options{'prefix'}) if $options{'prefix'} && $^O =~ /Win32/ && !-d $options{'prefix'};
-    my $prefix      = ($options{'prefix'} && abs_path($options{'prefix'})) || cwd().'/install';
+    my $prefix      = $options{'prefix'}
+                    ? abs_path($options{'prefix'})
+                    : ($options{sysroot}
+		      ? '/usr'
+		      : File::Spec->catdir(cwd, 'install'));
     $config{prefix} = $prefix;
+    $config{sysroot} = $options{sysroot};
+    $config{sdkroot} = $options{sdkroot};
 
     # Save options in config.status
     unlink('config.status');
@@ -336,6 +344,9 @@ sub print_help {
 General Options:
     --help             Show this text
     --prefix=dir       Install files in dir
+    --sdkroot=dir      When given, use for searching build tools here, e.g.
+                       nqp, java etc.
+    --sysroot=dir      When given, use for searching runtime components here
     --backends=list    Backends to use: $backends
     --with-parrot=path/to/bin/parrot
                        Parrot executable to use to build NQP

tools/build/Makefile-common.in

@@ -99,6 +99,7 @@ CP            = $(PERL) -MExtUtils::Command -e cp
 RM_RF         = $(PERL) -MExtUtils::Command -e rm_rf
 RM_F          = $(PERL) -MExtUtils::Command -e rm_f
 
+SYSROOT         = @sysroot@
 PREFIX          = @prefix@
 BIN_DIR         = $(PREFIX)/bin
 NQP_LANG_DIR    = $(PREFIX)/share/nqp

tools/lib/NQP/Configure.pm

@@ -437,13 +437,14 @@ sub gen_moar {
     my %options  = @_;
 
     my $prefix     = $options{'prefix'} || cwd()."/install";
+    my $sdkroot    = $options{'sdkroot'} || '';
     my $gen_moar   = $options{'gen-moar'};
     my @opts       = @{ $options{'moar-option'} || [] };
     push @opts, "--optimize";
     my $startdir   = cwd();
     my $git_protocol = $options{'git-protocol'} || 'https';
 
-    my $moar_exe   = $options{'with-moar'} || "$prefix/bin/moar$exe";
+    my $moar_exe   = $options{'with-moar'} || File::Spec->catfile( $sdkroot, $prefix, 'bin', "moar$exe" );
     my $moar_have  = qx{ $moar_exe --version };
     if ($moar_have) {
         $moar_have = $moar_have =~ /version (\S+)/ ? $1 : undef;