diff mbox series

[RFC,v2,2/5] kernel.bbclass: Export artifacts needed for out-of-tree Rust compilation

Message ID 20251204113058.948115-3-yoann.congal@smile.fr
State New
Headers show
Series Kernel Rust out-of-tree module support | expand

Commit Message

Yoann Congal Dec. 4, 2025, 11:30 a.m. UTC 
From: Yoann Congal <yoann.congal@smile.fr>

Publish artifacts from kernel compilation to allow out-of-tree Rust
compilation:
* scripts/target.json: target definition: architecture, ABI, compiler
  options, ...
* rust/: the crates compiled by the kernel available to
  out-of-tree-modules

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
---
v1->v2:
* indentation spaces -> tabs
---
 meta/classes-recipe/kernel.bbclass | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
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Patch

diff --git a/meta/classes-recipe/kernel.bbclass b/meta/classes-recipe/kernel.bbclass
index 32d8fc78686..9b12a8b58f1 100644
--- a/meta/classes-recipe/kernel.bbclass
+++ b/meta/classes-recipe/kernel.bbclass
@@ -632,6 +632,24 @@  do_shared_workdir () {
 		cp -r scripts/gcc-plugins ${kerneldir}/scripts
 	fi
 
+	if ${@bb.utils.contains("DISTRO_FEATURES", "rust-kernel", "true", "false", d)}; then
+		# Copy target.json file needed for out-of-tree rust modules
+		if [ -e scripts/target.json ]; then
+			bbnote "Copying scripts/target.json"
+			mkdir -p ${kerneldir}/scripts
+			cp scripts/target.json ${kerneldir}/scripts
+		else
+			bbwarn "scripts/target.json not found in compiled kernel. Out-of-tree rust modules will fail to build."
+		fi
+
+		# Copy rust/ needed by out-of-tree module (firstly for the core rust crate)
+		if [ -e rust/ ]; then
+			bbnote "Copying rust/"
+			cp -r rust ${kerneldir}/
+		else
+			bbwarn "rust/ not found in compiled kernel. Out-of-tree rust modules will fail to build."
+		fi
+	fi
 }
 
 # We don't need to stage anything, not the modules/firmware since those would clash with linux-firmware