Fix cross-build

Author: oech3

GNUmakefile

@@ -27,6 +27,7 @@ RM := rm -rf
 # Binaries
 CARGO  ?= cargo
 CARGOFLAGS ?=
+RUSTC_ARCH ?= # should be empty instead of --target $(shell rustc -vV | sed -n 's/host: //p') to share crates ar target dir
 
 # Install directories
 PREFIX ?= /usr/local
@@ -342,14 +343,14 @@ use_default := 1
 build-pkgs:
 ifneq (${MULTICALL}, y)
 ifdef BUILD_SPEC_FEATURE
-	${CARGO} build ${CARGOFLAGS} --features "$(BUILD_SPEC_FEATURE)" ${PROFILE_CMD} $(foreach pkg,$(EXES),-p uu_$(pkg))
+	$(CARGO) build $(CARGOFLAGS) --features "$(BUILD_SPEC_FEATURE)" ${PROFILE_CMD} $(foreach pkg,$(EXES),-p uu_$(pkg)) $(RUSTC_ARCH)
 else
-	${CARGO} build ${CARGOFLAGS} ${PROFILE_CMD} $(foreach pkg,$(EXES),-p uu_$(pkg))
+	$(CARGO) build $(CARGOFLAGS) $(PROFILE_CMD) $(foreach pkg,$(EXES),-p uu_$(pkg)) $(RUSTC_ARCH)
 endif
 endif
 
 build-coreutils:
-	${CARGO} build ${CARGOFLAGS} --features "${EXES} $(BUILD_SPEC_FEATURE)" ${PROFILE_CMD} --no-default-features
+	$(CARGO) build $(CARGOFLAGS) --features "$(EXES) $(BUILD_SPEC_FEATURE)" $(PROFILE_CMD) --no-default-features $(RUSTC_ARCH)
 
 build: build-coreutils build-pkgs locales
 
@@ -400,15 +401,16 @@ busytest: $(BUILDDIR)/busybox $(addprefix test_busybox_,$(filter-out $(SKIP_UTIL
 endif
 
 clean:
-	cargo clean
-	cd $(DOCSDIR) && $(MAKE) clean
+	cargo clean $(RUSTC_ARCH)
+	cd $(DOCSDIR) && $(MAKE) clean $(RUSTC_ARCH)
 
 distclean: clean
-	$(CARGO) clean $(CARGOFLAGS) && $(CARGO) update $(CARGOFLAGS)
+	$(CARGO) clean $(CARGOFLAGS) $(RUSTC_ARCH) && $(CARGO) update $(CARGOFLAGS) $(RUSTC_ARCH)
 
 ifeq ($(MANPAGES),y)
 build-uudoc:
-	${CARGO} build ${CARGOFLAGS} --bin uudoc --features "uudoc ${EXES}" ${PROFILE_CMD} --no-default-features
+	# Use same PROFILE with coreutils to share crates (if not cross-build)
+	$(CARGO) build $(CARGOFLAGS) --bin uudoc --features "uudoc $(EXES)" $(PROFILE_CMD) --no-default-features
 
 install-manpages: build-uudoc
 	mkdir -p $(DESTDIR)$(DATAROOTDIR)/man/man1