diff --git a/meta/recipes-devtools/gcc/gcc-common.inc b/meta/recipes-devtools/gcc/gcc-common.inc
index fe112d9..4f8e18f 100644
--- a/meta/recipes-devtools/gcc/gcc-common.inc
+++ b/meta/recipes-devtools/gcc/gcc-common.inc
@@ -63,6 +63,62 @@ do_unpack[stamp-base] = "${SS}"
 do_headerfix[stamp-base] = "${SS}"
 do_patch[stamp-base] = "${SS}"
 
+# Shared source for basichash
+def check_shared_taskdone(d, task):
+    import os.path, bb.utils
+    basedir = d.getVar('SW', True)
+    bb.utils.mkdirhier(basedir)
+    fn = os.path.join(basedir, "%s.done" % (task))
+    return os.path.exists(fn)
+
+def mark_shared_taskdone(d, task):
+    import os.path, bb.utils
+    basedir = d.getVar('SW', True)
+    bb.utils.mkdirhier(basedir)
+    fn = os.path.join(basedir, "%s.done" % (task))
+    f = open(fn, "w")
+    f.close()
+
+do_fetch[lockfiles] = "${SW}.fetch.lock"
+do_unpack[lockfiles] = "${SW}.unpack.lock"
+do_headerfix[lockfiles] = "${SW}.headerfix.lock"
+do_patch[lockfiles] = "${SW}.patch.lock"
+
+python do_fetch_prepend() {
+	if check_shared_taskdone(d, 'fetch'):
+		return
+}
+python do_fetch_append() {
+	mark_shared_taskdone(d, 'fetch')
+}
+
+python do_unpack_prepend() {
+	if check_shared_taskdone(d, 'unpack'):
+		return
+}
+python do_unpack_append() {
+	mark_shared_taskdone(d, 'unpack')
+}
+
+python do_patch_prepend() {
+	if check_shared_taskdone(d, 'patch'):
+		return
+}
+python do_patch_append() {
+	mark_shared_taskdone(d, 'patch')
+}
+
+do_headerfix_prepend() {
+	if [ -e "${SW}/headerfix.done" ]; then
+		return 0
+	fi
+}
+
+do_headerfix_append() {
+	mkdir -p "${SW}"
+	touch "${SW}/headerfix.done"
+}
+
 # SW means Shared Work directory
 SW = "${TMPDIR}/work-shared/gcc-${PV}-${PR}"
 WORKDIR_task-unpack = "${SW}"