[PATCH 3/4] rust: use rust-snapshot binaries only in rust-native

[Alexander Kanavin <alex.kanavin@gmail.com>]

From: Alexander Kanavin <alex@linutronix.de>

Otherwise, use rust-native and cargo-native binaries as that allows
our native tweaks in them to be used for target/nativesdk rust -
same as for everything else written in rust.

In particular, this allows building target rust with
cargo-native that includes important reproducibility tweaks.

Unfortunately, this also breaks rust selftest, and that
is partially addressed by the following commit.

[YOCTO #15185]

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
---
 meta/recipes-devtools/rust/rust_1.75.0.bb | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/meta/recipes-devtools/rust/rust_1.75.0.bb b/meta/recipes-devtools/rust/rust_1.75.0.bb
index 8ef838ee90c..e82a7395e44 100644
--- a/meta/recipes-devtools/rust/rust_1.75.0.bb
+++ b/meta/recipes-devtools/rust/rust_1.75.0.bb
@@ -11,6 +11,11 @@ DEPENDS += "file-native python3-native"
 DEPENDS:append:class-native = " rust-llvm-native"
 DEPENDS:append:class-nativesdk = " nativesdk-rust-llvm"
 
+# native rust uses cargo/rustc from binary snapshots to bootstrap
+# but everything else should use our native builds
+DEPENDS:append:class-target = " cargo-native rust-native"
+DEPENDS:append:class-nativesdk = " cargo-native rust-native"
+
 DEPENDS += "rust-llvm (=${PV})"
 
 RDEPENDS:${PN}:append:class-target = " gcc g++ binutils"
@@ -68,6 +73,11 @@ addtask do_test_compile after do_configure do_rust_gen_targets
 do_rust_setup_snapshot[dirs] += "${WORKDIR}/rust-snapshot"
 do_rust_setup_snapshot[vardepsexclude] += "UNINATIVE_LOADER"
 
+RUSTC_BOOTSTRAP = "${STAGING_BINDIR_NATIVE}/rustc"
+CARGO_BOOTSTRAP = "${STAGING_BINDIR_NATIVE}/cargo"
+RUSTC_BOOTSTRAP:class-native = "${WORKDIR}/rust-snapshot/bin/rustc"
+CARGO_BOOTSTRAP:class-native = "${WORKDIR}/rust-snapshot/bin/cargo"
+
 python do_configure() {
     import json
     import configparser
@@ -141,10 +151,10 @@ python do_configure() {
     config.set("build", "docs", e(False))
     config.set("build", "tools", ["rust-demangler",])
 
-    rustc = d.expand("${WORKDIR}/rust-snapshot/bin/rustc")
+    rustc = d.getVar('RUSTC_BOOTSTRAP')
     config.set("build", "rustc", e(rustc))
 
-    cargo = d.expand("${WORKDIR}/rust-snapshot/bin/cargo")
+    cargo = d.getVar('CARGO_BOOTSTRAP')
     config.set("build", "cargo", e(cargo))
 
     config.set("build", "vendor", e(True))
-- 
2.39.2