# Extract the snapshot host compiler

$(HBIN0_H_$(CFG_BUILD))/:
	mkdir -p $@

# On windows these two are the same, so cause a redifinition warning
ifneq ($(HBIN0_H_$(CFG_BUILD)),$(HLIB0_H_$(CFG_BUILD)))
$(HLIB0_H_$(CFG_BUILD))/:
	mkdir -p $@
endif

$(SNAPSHOT_RUSTC_POST_CLEANUP): \
		$(S)src/snapshots.txt \
		$(S)src/etc/get-snapshot.py $(MKFILE_DEPS) \
		| $(HBIN0_H_$(CFG_BUILD))/

	@$(call E, fetch: $@)
#   Note: the variable "SNAPSHOT_FILE" is generally not set, and so
#   we generally only pass one argument to this script.
ifdef CFG_ENABLE_LOCAL_RUST
	$(Q)$(S)src/etc/local_stage0.sh $(CFG_BUILD) $(CFG_LOCAL_RUST_ROOT) rustlib
else
	$(Q)$(CFG_PYTHON) $(S)src/etc/get-snapshot.py $(CFG_BUILD) $(SNAPSHOT_FILE)
endif
	$(Q)if [ -e "$@" ]; then touch "$@"; else echo "ERROR: snapshot $@ not found"; exit 1; fi

# For other targets, let the host build the target:

define BOOTSTRAP_STAGE0
  # $(1) target to bootstrap
  # $(2) stage to bootstrap from
  # $(3) target to bootstrap from

$(HBIN0_H_$(1))/:
	mkdir -p $@

$(HLIB0_H_$(1))/:
	mkdir -p $@

$$(HBIN0_H_$(1))/rustc$$(X_$(1)): \
		$$(TBIN$(2)_T_$(1)_H_$(3))/rustc$$(X_$(1)) \
		| $(HBIN0_H_$(1))/
	@$$(call E, cp: $$@)
	$$(Q)cp $$< $$@

endef

# Use stage1 to build other architectures: then you don't have to wait
# for stage2, but you get the latest updates to the compiler source.
$(foreach t,$(NON_BUILD_HOST), \
 $(eval $(call BOOTSTRAP_STAGE0,$(t),1,$(CFG_BUILD))))