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build: Add submodule for qbe

Qbe is an external dependency for scc, and to make easy
to bootstrap scc is better to add it like a submodule,
in a way that we can install it at the same time than
any other part of scc.

git/query: bad hash bb16529b34a844c6e15f8837950585761122106e

--- /dev/null

+++ b/.gitmodules

@@ -1,0 +1,3 @@

+[submodule "src/cmd/qbe"]

+	path = src/cmd/qbe

+	url = git://c9x.me/qbe.git

--- a/src/cmd/Makefile

+++ b/src/cmd/Makefile

@@ -1,6 +1,7 @@

 .POSIX:

 DIRS   =\

+	qbe\

 	ld\

 	as\

 	cc\

@@ -17,8 +18,20 @@

 	$(BINDIR)/objdump\

 	$(BINDIR)/objcopy\

 	$(BINDIR)/addr2line\

+	$(BINDIR)/qbe\

 all: $(TARGET) $(DIRS)

+

+qbe: qbe/.git

+

+qbe/.git:

+	git submodule init qbe

+	git submodule update

+

+qbe/obj/qbe: qbe

+

+$(BINDIR)/qbe: qbe/obj/qbe

+	cp qbe/obj/qbe $@

 $(BINDIR)/nm: nm.o $(LIBMACH) $(LIBSCC)

 	$(CC) $(PROJ_LDFLAGS) nm.o -lmach -lscc -o $@