Fix rust-lang#3225: Check for old Rust libraries when building and in…

…stalling.

When building Rust libraries (e.g. librustc, libstd, etc), checks for
and verbosely removes previous build products before invoking rustc.
(Also, when Make variable VERBOSE is defined, it will list all of the
libraries matching the object library's glob after the rustc
invocation has completed.)

When installing Rust libraries, checks for previous libraries in
target install directory, but does not remove them.

The thinking behind these two different modes of operation is that the
installation target, unlike the build tree, is not under the control
of this infrastructure and it is not up to this Makefile to decide if
the previous libraries should be removed.

Makefile.in

@@ -235,6 +235,33 @@ LIBRUST_DSYM_GLOB_$(1) :=$(call CFG_LIB_DSYM_GLOB_$(1),rust)
 
 endef
 
+# $(1) is the path for directory to match against
+# $(2) is the glob to use in the match
+# $(3) is filename (usually the target being created) to filter out from match
+#      (i.e. filename is not out-of-date artifact from prior Rust version/build)
+# The glob denoted by $(2) often is constructed with a space character prefix,
+# which is why we cannot just do `ls` on $(1)/$(2).
+define CHECK_FOR_OLD_GLOB_MATCHES_EXCEPT
+  $(Q)( cd $(1) && ( ls $(2) 2>/dev/null || true ) | grep -v $(3) > /dev/null && echo "Warning: there are previous" '$(2)' "libraries:" || true )
+  $(Q)( cd $(1) && ( ls $(2) 2>/dev/null || true ) | grep -v $(3) || true )
+endef
+
+# Same interface as above, but deletes rather than just listing the files.
+define REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT
+  $(Q)( cd $(1) && ( ls $(2) 2>/dev/null || true ) | grep -v $(3) > /dev/null && echo "Warning: removing previous" '$(2)' "libraries:" || true )
+  $(Q)( cd $(1) && ( ls $(2) 2>/dev/null || true ) | grep -v $(3) | xargs rm -v )
+endef
+
+ifdef VERBOSE
+define LIST_ALL_OLD_GLOB_MATCHES_EXCEPT
+  @echo "Info: now are following matches for" '$(2)' "libraries:"
+  @( cd $(1) && ( ls $(2) 2>/dev/null || true ) | grep -v $(3) || true )
+endef
+else
+define LIST_ALL_OLD_GLOB_MATCHES_EXCEPT
+endef
+endif
+
 $(foreach target,$(CFG_TARGET_TRIPLES),\
   $(eval $(call DEF_LIBS,$(target))))
 

mk/host.mk

@@ -45,10 +45,12 @@ $$(HLIB$(2)_H_$(4))/$(CFG_LIBRUSTC_$(4)): \
 	| $$(HLIB$(2)_H_$(4))/
 
 	@$$(call E, cp: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBRUSTC_GLOB_$(4)), `basename $$@`)
 	$$(Q)cp $$< $$@
 	$$(Q)cp -R $$(TLIB$(1)_T_$(4)_H_$(3))/$(LIBRUSTC_GLOB_$(4)) \
 		$(wildcard $$(TLIB$(1)_T_$(4)_H_$(3))/$(LIBRUSTC_DSYM_GLOB_$(4))) \
 	        $$(HLIB$(2)_H_$(4))
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBRUSTC_GLOB_$(4)), `basename $$@`)
 
 $$(HLIB$(2)_H_$(4))/$(CFG_LIBSYNTAX_$(4)): \
 	$$(TLIB$(1)_T_$(4)_H_$(3))/$(CFG_LIBSYNTAX_$(4)) \
@@ -58,10 +60,12 @@ $$(HLIB$(2)_H_$(4))/$(CFG_LIBSYNTAX_$(4)): \
 	$$(HEXTRALIB_DEFAULT$(2)_H_$(4)) \
 	| $$(HLIB$(2)_H_$(4))/
 	@$$(call E, cp: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBSYNTAX_GLOB_$(4)), `basename $$@`)
 	$$(Q)cp $$< $$@
 	$$(Q)cp -R $$(TLIB$(1)_T_$(4)_H_$(3))/$(LIBSYNTAX_GLOB_$(4)) \
 		$$(wildcard $$(TLIB$(1)_T_$(4)_H_$(3))/$(LIBSYNTAX_DSYM_GLOB_$(4))) \
 	        $$(HLIB$(2)_H_$(4))
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBSYNTAX_GLOB_$(4)), `basename $$@`)
 
 $$(HLIB$(2)_H_$(4))/$(CFG_RUNTIME_$(4)): \
 	$$(TLIB$(1)_T_$(4)_H_$(3))/$(CFG_RUNTIME_$(4)) \
@@ -74,6 +78,7 @@ $$(HLIB$(2)_H_$(4))/$(CFG_STDLIB_$(4)): \
 	$$(HLIB$(2)_H_$(4))/$(CFG_RUNTIME_$(4)) \
 	| $$(HLIB$(2)_H_$(4))/
 	@$$(call E, cp: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(STDLIB_GLOB_$(4)), `basename $$@`)
 	$$(Q)cp $$< $$@
 # Subtle: We do not let the shell expand $(STDLIB_DSYM_GLOB) directly rather
 # we use Make's $$(wildcard) facility. The reason is that, on mac, when using
@@ -85,17 +90,20 @@ $$(HLIB$(2)_H_$(4))/$(CFG_STDLIB_$(4)): \
 	$$(Q)cp -R $$(TLIB$(1)_T_$(4)_H_$(3))/$(STDLIB_GLOB_$(4)) \
 		$$(wildcard $$(TLIB$(1)_T_$(4)_H_$(3))/$(STDLIB_DSYM_GLOB_$(4))) \
 	        $$(HLIB$(2)_H_$(4))
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(STDLIB_GLOB_$(4)), `basename $$@`)
 
 $$(HLIB$(2)_H_$(4))/$(CFG_EXTRALIB_$(4)): \
 	$$(TLIB$(1)_T_$(4)_H_$(3))/$(CFG_EXTRALIB_$(4)) \
 	$$(HLIB$(2)_H_$(4))/$(CFG_STDLIB_$(4)) \
 	$$(HLIB$(2)_H_$(4))/$(CFG_RUNTIME_$(4)) \
 	| $$(HLIB$(2)_H_$(4))/
 	@$$(call E, cp: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(4)), `basename $$@`)
 	$$(Q)cp $$< $$@
 	$$(Q)cp -R $$(TLIB$(1)_T_$(4)_H_$(3))/$(EXTRALIB_GLOB_$(4)) \
 		$$(wildcard $$(TLIB$(1)_T_$(4)_H_$(3))/$(EXTRALIB_DSYM_GLOB_$(4))) \
 	        $$(HLIB$(2)_H_$(4))
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(4)), `basename $$@`)
 
 $$(HLIB$(2)_H_$(4))/libstd.rlib: \
 	$$(TLIB$(1)_T_$(4)_H_$(3))/libstd.rlib \

mk/install.mk

@@ -16,13 +16,21 @@
 # destination directory as arg 2, and filename/libname-glob as arg 3
 ifdef VERBOSE
  INSTALL = install -m755 $(1)/$(3) $(2)/$(3)
- INSTALL_LIB = install -m644 `ls -drt1 $(1)/$(3) | tail -1` $(2)/
+ DO_INSTALL_LIB = install -m644 `ls -drt1 $(1)/$(3) | tail -1` $(2)/
 else
  INSTALL = $(Q)$(call E, install: $(2)/$(3)) && install -m755 $(1)/$(3) $(2)/$(3)
- INSTALL_LIB = $(Q)$(call E, install_lib: $(2)/$(3)) &&                    \
+ DO_INSTALL_LIB = $(Q)$(call E, install_lib: $(2)/$(3)) &&                    \
 	       install -m644 `ls -drt1 $(1)/$(3) | tail -1` $(2)/
 endif
 
+# $(1) is the source dirctory
+# $(2) is the destination directory
+# $(3) is the filename/libname-glob
+define INSTALL_LIB
+  LIB_NAME=`ls -drt1 $(1)/$(3) | tail -1 | xargs basename` ; ( ls -drt1 $(2)/$(3) 2>/dev/null || true ) | grep -v $$LIB_NAME >/dev/null 2>&1 && echo "Warning, one or more libraries matching Rust library '$(3)'" && echo "  (other than '$$LIB_NAME' itself) already present" && echo "  at destination $(2):" && ( ls -drt1 $(2)/$(3) 2>/dev/null || true ) | grep -v $$LIB_NAME || true
+  $(call DO_INSTALL_LIB,$(1),$(2),$(3))
+endef
+
 # The stage we install from
 ISTAGE = 2
 

mk/stage0.mk

@@ -1,10 +1,16 @@
 # Extract the snapshot host compiler
 
+$(HBIN0_H_$(CFG_BUILD_TRIPLE))/:
+	mkdir -p $@
 
+$(HLIB0_H_$(CFG_BUILD_TRIPLE))/:
+	mkdir -p $@
 
 $(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE)):		\
 		$(S)src/snapshots.txt					\
-		$(S)src/etc/get-snapshot.py $(MKFILE_DEPS)
+		$(S)src/etc/get-snapshot.py $(MKFILE_DEPS)		\
+		| $(HBIN0_H_$(CFG_BUILD_TRIPLE))/
+
 	@$(call E, fetch: $@)
 #   Note: the variable "SNAPSHOT_FILE" is generally not set, and so
 #   we generally only pass one argument to this script.
@@ -22,23 +28,28 @@ endif
 # Host libs will be extracted by the above rule
 
 $(HLIB0_H_$(CFG_BUILD_TRIPLE))/$(CFG_RUNTIME_$(CFG_BUILD_TRIPLE)): \
-		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE))
+		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE)) \
+		| $(HLIB0_H_$(CFG_BUILD_TRIPLE))/
 	$(Q)touch $@
 
 $(HLIB0_H_$(CFG_BUILD_TRIPLE))/$(CFG_STDLIB_$(CFG_BUILD_TRIPLE)): \
-		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE))
+		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE)) \
+		| $(HLIB0_H_$(CFG_BUILD_TRIPLE))/
 	$(Q)touch $@
 
 $(HLIB0_H_$(CFG_BUILD_TRIPLE))/$(CFG_EXTRALIB_$(CFG_BUILD_TRIPLE)): \
-		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE))
+		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE)) \
+		| $(HLIB0_H_$(CFG_BUILD_TRIPLE))/
 	$(Q)touch $@
 
 $(HLIB0_H_$(CFG_BUILD_TRIPLE))/$(CFG_LIBRUSTC_$(CFG_BUILD_TRIPLE)): \
-		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE))
+		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE)) \
+		| $(HLIB0_H_$(CFG_BUILD_TRIPLE))/
 	$(Q)touch $@
 
 $(HLIB0_H_$(CFG_BUILD_TRIPLE))/$(CFG_RUSTLLVM_$(CFG_BUILD_TRIPLE)): \
-		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE))
+		$(HBIN0_H_$(CFG_BUILD_TRIPLE))/rustc$(X_$(CFG_BUILD_TRIPLE)) \
+		| $(HLIB0_H_$(CFG_BUILD_TRIPLE))/
 	$(Q)touch $@
 
 # For other targets, let the host build the target:
@@ -48,33 +59,51 @@ define BOOTSTRAP_STAGE0
   # $(2) stage to bootstrap from
   # $(3) target to bootstrap from
 
-$$(HBIN0_H_$(1))/rustc$$(X_$(1)):								\
-		$$(TBIN$(2)_T_$(1)_H_$(3))/rustc$$(X_$(1))
+$(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))/
 	@$$(call E, cp: $$@)
 	$$(Q)cp $$< $$@
 
 $$(HLIB0_H_$(1))/$(CFG_RUNTIME_$(1)): \
-		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_RUNTIME_$(1))
+		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_RUNTIME_$(1)) \
+		| $(HLIB0_H_$(1))/
 	@$$(call E, cp: $$@)
 	$$(Q)cp $$< $$@
 
 $$(HLIB0_H_$(1))/$(CFG_STDLIB_$(1)): \
-		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_STDLIB_$(1))
+		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_STDLIB_$(1)) \
+		| $(HLIB0_H_$(1))/
 	@$$(call E, cp: $$@)
+	$$(call CHECK_FOR_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(4)), `basename $$@`)
 	$$(Q)cp $$(TLIB$(2)_T_$(1)_H_$(3))/$(STDLIB_GLOB_$(1)) $$@
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(4)), `basename $$@`)
 
 $$(HLIB0_H_$(1))/$(CFG_EXTRALIB_$(1)): \
-		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_EXTRALIB_$(1))
+		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_EXTRALIB_$(1)) \
+		| $(HLIB0_H_$(1))/
 	@$$(call E, cp: $$@)
+	$$(call CHECK_FOR_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(4)), `basename $$@`)
 	$$(Q)cp $$(TLIB$(2)_T_$(1)_H_$(3))/$(EXTRALIB_GLOB_$(1)) $$@
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(4)), `basename $$@`)
 
 $$(HLIB0_H_$(1))/$(CFG_LIBRUSTC_$(1)): \
-		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_LIBRUSTC_$(1))
+		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_LIBRUSTC_$(1)) \
+		| $(HLIB0_H_$(1))/
 	@$$(call E, cp: $$@)
+	$$(call CHECK_FOR_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBRUSTC_GLOB_$(4)), `basename $$@`)
 	$$(Q)cp $$(TLIB$(2)_T_$(1)_H_$(3))/$(LIBRUSTC_GLOB_$(1)) $$@
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBRUSTC_GLOB_$(4)), `basename $$@`)
 
 $$(HLIB0_H_$(1))/$(CFG_RUSTLLVM_$(1)): \
-		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_RUSTLLVM_$(1))
+		$$(TLIB$(2)_T_$(1)_H_$(3))/$(CFG_RUSTLLVM_$(1)) \
+		| $(HLIB0_H_$(1))/
 	@$$(call E, cp: $$@)
 	$$(Q)cp $$< $$@
 

mk/target.mk

@@ -48,15 +48,19 @@ $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_STDLIB_$(2)): \
 		$$(TSREQ$(1)_T_$(2)_H_$(3)) \
 		| $$(TLIB$(1)_T_$(2)_H_$(3))/
 	@$$(call E, compile_and_link: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(STDLIB_GLOB_$(2)), `basename $$@`)
 	$$(STAGE$(1)_T_$(2)_H_$(3)) $$(WFLAGS_ST$(1)) -o $$@ $$< && touch $$@
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(STDLIB_GLOB_$(2)), `basename $$@`)
 
 $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_EXTRALIB_$(2)): \
 		$$(EXTRALIB_CRATE) $$(EXTRALIB_INPUTS) \
 	        $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_STDLIB_$(2)) \
 		$$(TSREQ$(1)_T_$(2)_H_$(3)) \
 		| $$(TLIB$(1)_T_$(2)_H_$(3))/
 	@$$(call E, compile_and_link: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(2)), `basename $$@`)
 	$$(STAGE$(1)_T_$(2)_H_$(3)) $$(WFLAGS_ST$(1)) -o $$@ $$< && touch $$@
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(EXTRALIB_GLOB_$(2)), `basename $$@`)
 
 $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_LIBSYNTAX_$(3)): \
                 $$(LIBSYNTAX_CRATE) $$(LIBSYNTAX_INPUTS) \
@@ -65,7 +69,9 @@ $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_LIBSYNTAX_$(3)): \
 		$$(TEXTRALIB_DEFAULT$(1)_T_$(2)_H_$(3)) \
 		| $$(TLIB$(1)_T_$(2)_H_$(3))/
 	@$$(call E, compile_and_link: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBSYNTAX_GLOB_$(2)), `basename $$@`)
 	$$(STAGE$(1)_T_$(2)_H_$(3)) $(BORROWCK) -o $$@ $$< && touch $$@
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBSYNTAX_GLOB_$(2)), `basename $$@`)
 
 # Only build the compiler for host triples
 ifneq ($$(findstring $(2),$$(CFG_HOST_TRIPLES)),)
@@ -83,7 +89,9 @@ $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_LIBRUSTC_$(3)):		\
                 $$(TLIB$(1)_T_$(2)_H_$(3))/$(CFG_RUSTLLVM_$(3)) \
 		| $$(TLIB$(1)_T_$(2)_H_$(3))/
 	@$$(call E, compile_and_link: $$@)
+	$$(call REMOVE_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBRUSTC_GLOB_$(2)), `basename $$@`)
 	$$(STAGE$(1)_T_$(2)_H_$(3)) -o $$@ $$< && touch $$@
+	$$(call LIST_ALL_OLD_GLOB_MATCHES_EXCEPT, `dirname $$@`, $(LIBRUSTC_GLOB_$(2)), `basename $$@`)
 
 $$(TBIN$(1)_T_$(2)_H_$(3))/rustc$$(X_$(3)):			\
 		$$(DRIVER_CRATE)				\