nativesdk: Add some tools in a separate recipe (#345)

* nativesdk: Add some tools in a separate recipe

This brings ATM:
- clippy
- rustfmt

Another approach might be to include these into the existing rust recipe,
but as we can't really use PACKAGECONFIG here it might just overload it.
This way, the tools will be built in parallel and still can be excluded
from the packgae group, if desired.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>

classes/rust-common.bbclass

@@ -138,6 +138,12 @@ create_wrapper () {
 	chmod +x "${file}"
 }
 
+export WRAPPER_TARGET_CC = "${CC}"
+export WRAPPER_TARGET_CXX = "${CXX}"
+export WRAPPER_TARGET_CCLD = "${CCLD}"
+export WRAPPER_TARGET_LDFLAGS = "${LDFLAGS}"
+export WRAPPER_TARGET_AR = "${AR}"
+
 # compiler is used by gcc-rs
 # linker is used by rustc/cargo
 # archiver is used by the build of libstd-rs
@@ -154,13 +160,14 @@ do_rust_create_wrappers () {
 	create_wrapper "${RUST_BUILD_AR}" "${BUILD_AR}"
 
 	# Yocto Target / Rust Target C compiler
-	create_wrapper "${RUST_TARGET_CC}" "${CC}"
+	create_wrapper "${RUST_TARGET_CC}" "${WRAPPER_TARGET_CC}"
 	# Yocto Target / Rust Target C++ compiler
-	create_wrapper "${RUST_TARGET_CXX}" "${CXX}"
+	create_wrapper "${RUST_TARGET_CXX}" "${WRAPPER_TARGET_CXX}"
 	# Yocto Target / Rust Target linker
-	create_wrapper "${RUST_TARGET_CCLD}" "${CCLD}" "${LDFLAGS}"
+	create_wrapper "${RUST_TARGET_CCLD}" "${WRAPPER_TARGET_CCLD}" "${WRAPPER_TARGET_LDFLAGS}"
 	# Yocto Target / Rust Target archiver
-	create_wrapper "${RUST_TARGET_AR}" "${AR}"
+	create_wrapper "${RUST_TARGET_AR}" "${WRAPPER_TARGET_AR}"
+
 }
 
 addtask rust_create_wrappers before do_configure after do_patch