[PATCH 03/16] rust: install Rust library sources for 'make rustavailable' support

[Harish.Sadineni@windriver.com]

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

The `make rustavailable` process (1) expects the Rust standard library source files (e.g., `lib.rs`)
to be present in the `library/` directory under `rustlib/src/rust/`.

This patch ensures the required sources are available by:
- Copying the `library/` directory from the Rust source tree into `${TMPDIR}/work-shared/rust`
  during the snapshot setup.
- Installing the `library/` directory into `${SDKPATHNATIVE}/usr/lib/rustlib/src/rust` for the
  `nativesdk` class, making them available in them available in sdk

1) See the kernel tree for Documentation/rust/quick-start.rst in the section: Requirements: Building

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/rust/quick-start.rst#n145

Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
---
 meta/recipes-devtools/rust/rust_1.91.1.bb | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/meta/recipes-devtools/rust/rust_1.91.1.bb b/meta/recipes-devtools/rust/rust_1.91.1.bb
index a25f65f674..7644ecf2d2 100644
--- a/meta/recipes-devtools/rust/rust_1.91.1.bb
+++ b/meta/recipes-devtools/rust/rust_1.91.1.bb
@@ -63,6 +63,16 @@ do_rust_setup_snapshot () {
         done
     fi
 }
+
+do_rust_setup_snapshot:append:class-native () {
+   if ${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', 'true', 'false', d)}; then
+         if [ ! -d "${TMPDIR}/work-shared/rust" ]; then
+                mkdir -p ${TMPDIR}/work-shared/rust
+                cp -r ${RUSTSRC}/library ${TMPDIR}/work-shared/rust/.
+         fi
+   fi
+}
+
 addtask rust_setup_snapshot after do_unpack before do_configure
 addtask do_test_compile after do_configure do_rust_gen_targets
 do_rust_setup_snapshot[dirs] += "${WORKDIR}/rust-snapshot"
@@ -314,6 +324,13 @@ rust_do_install:class-nativesdk() {
 	export CARGO_TARGET_${RUST_HOST_TRIPLE}_RUNNER="\$OECORE_NATIVE_SYSROOT/lib/${SDKLOADER}"
 	export CC_$RUST_HOST_CC="${CCACHE}${HOST_PREFIX}gcc"
 	EOF
+    
+    if ${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', 'true', 'false', d)}; then
+           if [ ! -d ${D}${SDKPATHNATIVE}/usr/lib/rustlib/src/rust ]; then
+                mkdir -p ${D}${SDKPATHNATIVE}/usr/lib/rustlib/src/rust
+                cp -r --no-preserve=ownership  ${S}/library ${D}${SDKPATHNATIVE}/usr/lib/rustlib/src/rust/
+           fi
+    fi
 }
 
 FILES:${PN} += "${base_prefix}/environment-setup.d"
-- 
2.49.0