Factor the Makefiles to make writing outside Makefiles easier.

R=rsc
CC=golang-dev
https://golang.org/cl/650042

src/Make.cmd

@@ -2,22 +2,22 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-# GNU Make syntax:
-ifndef GOBIN
-GOBIN=$(HOME)/bin
-endif
 
-# ugly hack to deal with whitespaces in $GOBIN
+# ugly hack to deal with whitespaces in $GOROOT
 nullstring :=
 space := $(nullstring) # a space at the end
-QUOTED_GOBIN=$(subst $(space),\ ,$(GOBIN))
+QUOTED_GOROOT:=$(subst $(space),\ ,$(GOROOT))
+
+include $(QUOTED_GOROOT)/src/Make.common
+
+PREREQ+=$(patsubst %,%.make,$(DEPS))
 
 all: $(TARG)
 
 $(TARG): _go_.$O $(OFILES)
 	$(QUOTED_GOBIN)/$(LD) -o $@ _go_.$O $(OFILES)
 
-_go_.$O: $(GOFILES)
+_go_.$O: $(GOFILES) $(PREREQ)
 	$(QUOTED_GOBIN)/$(GC) -o $@ $(GOFILES)
 
 install: $(QUOTED_GOBIN)/$(TARG)
@@ -25,8 +25,7 @@ install: $(QUOTED_GOBIN)/$(TARG)
 $(QUOTED_GOBIN)/$(TARG): $(TARG)
 	cp -f $(TARG) $(QUOTED_GOBIN)
 
-clean:
-	rm -f *.[$(OS)] $(TARG) $(CLEANFILES)
+CLEANFILES+=$(TARG)
 
-nuke:
-	rm -f *.[$(OS)] $(TARG) $(CLEANFILES) $(QUOTED_GOBIN)/$(TARG)
+nuke: clean
+	rm -f $(QUOTED_GOBIN)/$(TARG)

src/Make.common

+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+# GNU Make syntax:
+ifndef GOBIN
+GOBIN=$(HOME)/bin
+endif
+
+# ugly hack to deal with whitespaces in $GOBIN
+nullstring :=
+space := $(nullstring) # a space at the end
+ifndef GOBIN
+QUOTED_HOME=$(subst $(space),\ ,$(HOME))
+GOBIN=$(QUOTED_HOME)/bin
+endif
+QUOTED_GOBIN=$(subst $(space),\ ,$(GOBIN))
+
+# ugly hack to deal with whitespaces in $GOROOT
+QUOTED_GOROOT:=$(subst $(space),\ ,$(GOROOT))
+
+clean:
+	rm -rf *.o *.a *.[$(OS)] [$(OS)].out $(CLEANFILES)
+
+%.make:
+	(cd $* && $(QUOTED_GOBIN)/gomake install)

src/Make.pkg

@@ -6,13 +6,12 @@ all: package
 package: _obj/$(TARG).a
 testpackage: _test/$(TARG).a
 
+# ugly hack to deal with whitespaces in $GOROOT
 nullstring :=
 space := $(nullstring) # a space at the end
-ifndef GOBIN
-QUOTED_HOME=$(subst $(space),\ ,$(HOME))
-GOBIN=$(QUOTED_HOME)/bin
-endif
-QUOTED_GOBIN=$(subst $(space),\ ,$(GOBIN))
+QUOTED_GOROOT:=$(subst $(space),\ ,$(GOROOT))
+
+include $(QUOTED_GOROOT)/src/Make.common
 
 # GNU Make 3.80 has a bug in lastword
 # elem=$(lastword $(subst /, ,$(TARG)))
@@ -25,9 +24,6 @@ else
 dir=$(patsubst %/$(elem),%,$(TARG))
 endif
 
-# ugly hack to deal with whitespaces in $GOROOT
-QUOTED_GOROOT=$(subst $(space),\ ,$(GOROOT))
-
 pkgdir=$(QUOTED_GOROOT)/pkg/$(GOOS)_$(GOARCH)
 
 INSTALLFILES+=$(pkgdir)/$(TARG).a
@@ -40,15 +36,15 @@ GOFILES+=_cgo_gotypes.go
 OFILES+=_cgo_defun.$O
 GCC_OFILES=$(patsubst %.go,%.cgo2.o,$(CGOFILES))
 INSTALLFILES+=$(pkgdir)/$(TARG).so
-PREREQ+=$(patsubst %,%.make,$(DEPS))
 endif
 
+PREREQ+=$(patsubst %,%.make,$(DEPS))
+
 coverage:
 	$(QUOTED_GOBIN)/gotest
 	$(QUOTED_GOBIN)/6cov -g $(shell pwd) $O.out | grep -v '_test\.go:'
 
-clean:
-	rm -rf *.[$(OS)o] *.a [$(OS)].out *.cgo1.go *.cgo2.c _cgo_defun.c _cgo_gotypes.go *.so _obj _test _testmain.go $(CLEANFILES)
+CLEANFILES+=*.cgo1.go *.cgo2.c _cgo_defun.c _cgo_gotypes.go *.so _obj _test _testmain.go
 
 test:
 	$(QUOTED_GOBIN)/gotest
@@ -90,9 +86,6 @@ importpath:
 dir:
 	@echo $(dir)
 
-%.make:
-	(cd $* && $(QUOTED_GOBIN)/gomake)
-
 # To use cgo in a Go package, add a line
 #
 #	CGOFILES=x.go y.go