1 files changed, 92 insertions, 0 deletions
diff --git a/eclass/crosscompile.eclass b/eclass/crosscompile.eclass
new file mode 100644
index 000000000000..3e771bbcb808
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+++ b/eclass/crosscompile.eclass
@@ -0,0 +1,92 @@
+# Copyright 2003 Gentoo Technologies, Inc.
+# Distributed under the term of the GNU General Public License v2
+# Author: Zachary T Welch
+# $Header: /var/cvsroot/gentoo-x86/eclass/crosscompile.eclass,v 1.1 2003/03/19 02:50:39 zwelch Exp $
+
+ECLASS=crosscompile
+INHERITED="$INHERITED $ECLASS"
+
+DESCRIPTION="Based on the ${ECLASS} eclass"
+
+# set default CBUILD and CCHOST if not set
+# CBUILD is the --build for configure
+# CCHOST is the --target for configure
+[ -n "${CBUILD}" ] || export CBUILD="${CHOST}"
+[ -n "${CCHOST}" ] || export CCHOST="${CHOST}"
+
+extract-arch() {
+	local ISSPARC=$(expr "${1}" : sparc64)
+
+        if [ $(expr "${1}" : 'i[3456]86') -eq 4 ]; then 
+		echo "i386"
+	elif [ $(expr "${1}" : alpha) -eq 5 ]; then
+		echo "alpha"
+	elif [ $(expr "${1}" : arm) -eq 3 ]; then
+		echo "arm"
+	elif [ $(expr "${1}" : hppa) -eq 4 ]; then
+		echo "parisc"
+	elif [ $(expr "${1}" : mips) -eq 4 ]; then
+		echo "mips"
+	elif [ $(expr "${1}" : powerpc) -eq 7 ]; then
+		echo "ppc"
+	elif  [ ${ISSPARC} -eq 5 ]; then
+		echo "sparc"
+	elif  [ ${ISSPARC} -eq 7 ]; then
+		echo "sparc64"
+	else
+		echo "unknown"
+	fi
+}
+
+build-arch() {
+	extract-arch "${CBUILD}"
+}
+chost-arch() {
+	extract-arch "${CHOST}"
+}
+target-arch() {
+	extract-arch "${CCHOST}"
+}
+
+
+# this function tests to see if we are currently 
+#  building something for another host
+cross-build() {
+	test "${CBUILD}" != "${CHOST}"
+}
+
+# this function tests to see if we are currently
+#  building something that targets another host
+#  this is useful primarily for cross-compiling tools
+#  These tools are typically available in parallel
+#  or in extension to the native toolchain(s).
+# NOTE: ebuilds must presently handle this type of 
+#  parallel installs themselves, but most packages
+#  that support --target should provide most of it
+cross-target() {
+	test "${CHOST}" != "${CCHOST}"
+}
+
+
+# this function should be called by all packages that want
+#  to be cross-compile compatible and safe about it.
+#  Right now, we take away a couple of obvious bullets from the
+#  guns aimed at users' toes... what others remain?
+cross-check() {
+	# if we're cross compiling, 
+	#  be sure to set ROOT or risk overwriting native versions
+	if cross-build && [ "${ROOT}" = "/" ]; then
+		eerror "You are cross-compiling and have not set ROOT"
+		die
+	fi
+
+	# if we're targeting another host, 
+	#  modify SLOT for parallel install
+	if cross-target; then 
+		# einfo ">>> Building for --target=${CCHOST}..."
+		SLOT="${CCHOST}-${1}"
+	else
+		SLOT="${1}"
+	fi
+}
+