auto merge of #9542 : pnkfelix/rust/fsk-fix-issue-9531, r=thestinger

r? strcat 

(please double check that it fixes things on your chroot, if possible, before approval)

Fix #9531

Makefile.in

@@ -608,6 +608,10 @@ config.stamp: $(S)configure $(S)Makefile.in $(S)src/snapshots.txt
 # Primary-target makefiles
 ######################################################################
 
+# Issue #9531: If you change the order of any of the following (or add
+# new definitions), make sure definitions always precede their uses,
+# especially for the dependency lists of recipes.
+
 include $(CFG_SRC_DIR)mk/target.mk
 include $(CFG_SRC_DIR)mk/host.mk
 include $(CFG_SRC_DIR)mk/stage0.mk

mk/stage0.mk

@@ -6,8 +6,6 @@ $(HBIN0_H_$(CFG_BUILD_TRIPLE))/:
 $(HLIB0_H_$(CFG_BUILD_TRIPLE))/:
 	mkdir -p $@
 
-SNAPSHOT_RUSTC_POST_CLEANUP=$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE))
-
 $(SNAPSHOT_RUSTC_POST_CLEANUP):						\
 		$(S)src/snapshots.txt					\
 		$(S)src/etc/get-snapshot.py $(MKFILE_DEPS)		\

mk/target.mk

@@ -36,6 +36,8 @@ WFLAGS_ST2 = -D warnings
 # had its chance to clean it out; otherwise the other products will be
 # inadvertantly included in the clean out.
 
+SNAPSHOT_RUSTC_POST_CLEANUP=$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE))
+
 define TARGET_STAGE_N
 
 $$(TLIB$(1)_T_$(2)_H_$(3))/libmorestack.a: \