[RFC PATCH 4/7] rust: stage rustlib sources for linux-yocto make rustavailable support

[Harish.Sadineni@windriver.com]

From: Harish Sadineni <Harish.Sadineni@windriver.com>

When building the Linux kernel with Rust support enabled (e.g., via `make rustavailable`),
 the build system expects the Rust standard library sources to be available under:

  ${STAGING_DIR_NATIVE}/usr/lib/rustlib/src/rust

Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
---
 meta/recipes-kernel/linux/linux-yocto.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/recipes-kernel/linux/linux-yocto.inc b/meta/recipes-kernel/linux/linux-yocto.inc
index 31adb1d9ff..0c94255f63 100644
--- a/meta/recipes-kernel/linux/linux-yocto.inc
+++ b/meta/recipes-kernel/linux/linux-yocto.inc
@@ -66,6 +66,12 @@ inherit kernel-yocto
 
 B = "${WORKDIR}/linux-${PACKAGE_ARCH}-${LINUX_KERNEL_TYPE}-build"
 
+do_patch:append(){
+	if [ ! -d ${STAGING_DIR_NATIVE}/usr/lib/rustlib/src/rust ]; then
+                mkdir -p ${STAGING_DIR_NATIVE}/usr/lib/rustlib/src/rust/
+                cp -r ${TMPDIR}/work-shared/rust ${STAGING_DIR_NATIVE}/usr/lib/rustlib/src/.
+        fi
+}
 do_install:append(){
 	if [ -n "${KMETA}" ]; then
 		rm -rf ${STAGING_KERNEL_DIR}/${KMETA}
-- 
2.49.0