new cargo, rust tweaks, etc

classes/cargo.bbclass

@@ -71,8 +71,8 @@ oe_cargo_build () {
 
 cargo_do_compile () {
 	cd "${B}"
-	export CC="${RUST_CC}"
-	export CFLAGS="${RUST_CFLAGS}"
+	export TARGET_CC="${RUST_CC}"
+	export TARGET_CFLAGS="${RUST_CFLAGS}"
 	export HOST_CC="${RUST_BUILD_CC}"
 	export HOST_CFLAGS="${RUST_BUILD_CFLAGS}"
 	oe_cargo_build

classes/rust.bbclass

@@ -73,3 +73,10 @@ oe_runrustc () {
 	bbnote ${RUSTC} ${RUSTC_ARCHFLAGS} ${RUSTC_FLAGS} "$@"
 	"${RUSTC}" ${RUSTC_ARCHFLAGS} ${RUSTC_FLAGS} "$@"
 }
+
+# XXX: for some reason bitbake sets BUILD_* & TARGET_* but uses the bare
+# variables for HOST. Alias things to make it easier for us.
+HOST_LDFLAGS  ?= "${LDFLAGS}"
+HOST_CFLAGS   ?= "${CFLAGS}"
+HOST_CXXFLAGS ?= "${CXXFLAGS}"
+HOST_CPPFLAGS ?= "${CPPFLAGS}"