---

yaml
---
r: 106704
b: refs/heads/try
c: 111137b
h: refs/heads/master
v: v3

Author: brson

[refs]

@@ -2,7 +2,7 @@
 refs/heads/master: b8ef9fd9c9f642ce7b8aed82782a1ed745d08d64
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: b8601a3d8b91ad3b653d143307611f2f5c75617e
-refs/heads/try: c8bc65f19ffdf31d0a322c3d6a57472689337889
+refs/heads/try: 111137b5f5d6ed1a633edd319244e69457609f25
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b
 refs/heads/try2: 147ecfdd8221e4a4d4e090486829a06da1e0ca3c

branches/try/mk/prepare.mk

@@ -106,7 +106,7 @@ prepare-host-tools: \
             $(foreach host,$(CFG_HOST),\
               prepare-host-tool-$(tool)-$(stage)-$(host))))
 
-prepare-host-dirs:
+prepare-host-dirs: prepare-maybe-clean
 	$(call PREPARE_DIR,$(PREPARE_DEST_BIN_DIR))
 	$(call PREPARE_DIR,$(PREPARE_DEST_LIB_DIR))
 	$(call PREPARE_DIR,$(PREPARE_DEST_MAN_DIR))
@@ -115,7 +115,8 @@ prepare-host-dirs:
 # $(2) is stage
 # $(3) is host
 define DEF_PREPARE_HOST_TOOL
-prepare-host-tool-$(1)-$(2)-$(3): $$(foreach dep,$$(TOOL_DEPS_$(1)),prepare-host-lib-$$(dep)-$(2)-$(3)) \
+prepare-host-tool-$(1)-$(2)-$(3): prepare-maybe-clean \
+                                  $$(foreach dep,$$(TOOL_DEPS_$(1)),prepare-host-lib-$$(dep)-$(2)-$(3)) \
                                   $$(HBIN$(2)_H_$(3))/$(1)$$(X_$(3)) \
                                   prepare-host-dirs
 	$$(if $$(findstring $(2), $$(PREPARE_STAGE)),\
@@ -140,7 +141,8 @@ $(foreach tool,$(PREPARE_TOOLS),\
 define DEF_PREPARE_HOST_LIB
 prepare-host-lib-$(1)-$(2)-$(3): PREPARE_WORKING_SOURCE_LIB_DIR=$$(PREPARE_SOURCE_LIB_DIR)
 prepare-host-lib-$(1)-$(2)-$(3): PREPARE_WORKING_DEST_LIB_DIR=$$(PREPARE_DEST_LIB_DIR)
-prepare-host-lib-$(1)-$(2)-$(3): $$(foreach dep,$$(RUST_DEPS_$(1)),prepare-host-lib-$$(dep)-$(2)-$(3))\
+prepare-host-lib-$(1)-$(2)-$(3): prepare-maybe-clean \
+                                 $$(foreach dep,$$(RUST_DEPS_$(1)),prepare-host-lib-$$(dep)-$(2)-$(3))\
                                  $$(HLIB$(2)_H_$(3))/stamp.$(1) \
                                  prepare-host-dirs
 	$$(if $$(findstring $(2), $$(PREPARE_STAGE)),\
@@ -166,7 +168,7 @@ define DEF_PREPARE_TARGET_N
 # Rebind PREPARE_*_LIB_DIR to point to rustlib, then install the libs for the targets
 prepare-target-$(2)-host-$(3)-$(1): PREPARE_WORKING_SOURCE_LIB_DIR=$$(PREPARE_SOURCE_LIB_DIR)/$$(CFG_RUSTLIBDIR)/$(2)/lib
 prepare-target-$(2)-host-$(3)-$(1): PREPARE_WORKING_DEST_LIB_DIR=$$(PREPARE_DEST_LIB_DIR)/$$(CFG_RUSTLIBDIR)/$(2)/lib
-prepare-target-$(2)-host-$(3)-$(1): \
+prepare-target-$(2)-host-$(3)-$(1): prepare-maybe-clean \
         $$(foreach crate,$$(TARGET_CRATES), \
           $$(TLIB$(1)_T_$(2)_H_$(3))/stamp.$$(crate)) \
         $$(if $$(findstring $(2),$$(CFG_HOST)), \
@@ -194,3 +196,9 @@ $(foreach host,$(CFG_HOST),\
   $(foreach target,$(CFG_TARGET), \
     $(foreach stage,$(PREPARE_STAGES),\
       $(eval $(call DEF_PREPARE_TARGET_N,$(stage),$(target),$(host))))))
+
+prepare-maybe-clean:
+	$(if $(findstring true,$(PREPARE_CLEAN)),\
+      @$(call E, cleaning destination $@),)
+	$(if $(findstring true,$(PREPARE_CLEAN)),\
+      $(Q)rm -r $(PREPARE_DEST_DIR),)