Added support for cross compiling packages on x86_64.

Two new options for the configuration file were added:
 * XBPS_CROSS_TARGET
 * XBPS_CROSS_DIR

XBPS_CROSS_TARGET should be set to the target triplet that you build
with the mktoolchain script.

XBPS_CROSS_DIR should point to the cross directory that mktoolchain
created if you've built one.

As proof of concept the glibc32 package has been added for x86_64,
and it works perfectly even in the chroot! with glibc32 in place
that means that I can build a gcc multilib and use -m32 to build
32bit packages! OH YEAH I LOVE THAT SHIT!!!!

--HG--
extra : convert_revision : 6b0008865e084674a1c4b58266f681871e519c66

templates/glibc32.tmpl

@@ -0,0 +1,80 @@
+# Template file for 'glibc32'
+pkgname=glibc32
+version=2.8
+wrksrc="libc"
+distfiles="ftp://ftp.archlinux.org/other/glibc/glibc-2.8_20080828.tar.bz2"
+build_style=gnu_configure
+configure_script="../configure"
+configure_env="BUILD_CC=$XBPS_CROSS_TARGET-gcc"
+configure_args="--with-tls -disable-profile --with-__thread
+ --enable-kernel=2.6.16 --enable-add-ons --without-gd --enable-bind-now
+ --without-cvs --without-selinux --prefix=/usr --libdir=/usr/lib32
+ --with-headers=/usr/include --cache-file=config.cache
+ --infodir=/usr/share/info"
+make_install_target="install_root=$XBPS_DESTDIR/$pkgname-$version install"
+short_desc="The GNU C library (32 bits)"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=f5756668f201e093cae0404e59dcf8c43ccc07757fd0a7455298ed89126c366a
+long_desc="
+ The GNU C Library is the standard system C library for all GNU systems,
+ and is an important part of what makes up a GNU system.  It provides the
+ system API for all programs written in C and C-compatible languages such
+ as C++ and Objective C; the runtime facilities of other programming
+ languages use the C library to access the underlying operating system.
+
+ This version is only for 64 bits systems."
+
+cross_compiler=yes
+base_package=yes
+build_depends="perl-5.10.0"
+
+pre_configure()
+{
+	# We must configure it in another directory.
+	mkdir -p $wrksrc/build_obj && cd $wrksrc/build_obj
+	wrksrc=$wrksrc/build_obj
+	echo "slibdir=/lib32" > $wrksrc/configparms
+	echo "CFLAGS+=-march=${XBPS_CROSS_TARGET%%-*} -mtune=generic" \
+		>> $wrksrc/configparms
+	echo "libc_cv_forced_unwind=yes" > config.cache
+	echo "libc_cv_c_cleanup=yes" >> config.cache
+}
+
+pre_install()
+{
+	# Pre-create /lib32 and /usr/lib32 directories.
+	for f in lib32 usr/lib32; do
+		[ ! -d $XBPS_MASTERDIR/$f ] && mkdir -p $XBPS_MASTERDIR/$f
+	done
+}
+
+post_install()
+{
+	local destdir=$XBPS_DESTDIR/$pkgname-$version
+	local tmpdir=$XBPS_BUILDDIR/$pkgname-tmp
+
+	mkdir -p $tmpdir/usr/include/gnu
+	mkdir -p $tmpdir/usr/include/sys
+
+	# Remove all headers except the ones required for 32bits stuff.
+	mv -v $destdir/include/gnu/stubs-32.h $tmpdir/usr/include/gnu
+	mv -v $destdir/include/sys/elf.h $tmpdir/usr/include/sys
+	mv -v $destdir/include/sys/vm86.h $tmpdir/usr/include/sys
+
+	rm -rf $destdir/include
+	mkdir -p $destdir/usr/include
+	mv -v $tmpdir/usr/include/* $destdir/usr/include
+
+	# Remove bins and unneeded stuff for compat32.
+	[ -d $destdir/xbps_destdir ] && rm -rf $destdir/xbps_destdir
+	rm -rf $destdir/sbin $destdir/bin $destdir/usr/sbin $destdir/usr/bin
+	rm -rf $destdir/share $destdir/libexec $destdir/etc
+	mv -v $destdir/lib/gconv $destdir/usr/lib32
+
+	# Remove wrong symlinks in shared libs and move them to /lib32.
+	find $destdir/lib -type l -print|xargs rm -v
+	mv -v $destdir/lib/* $destdir/lib32
+	cd $destdir/lib && ln -s ../lib32/ld-linux.so.2 ld-linux.so.2
+
+	rm -rf $tmpdir
+}