Add tools-only target, for bootstrapping the C/C++ front end.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9341 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile b/Makefile
index ade36fb..3c78ec3 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,9 @@
 	                  $(LEVEL)/config.log \
 	                  $(LEVEL)/TAGS
 
+tools-only:
+	@for dir in lib/Support utils lib tools; do $(MAKE) -C $$dir; done
+
 AUTOCONF = autoconf
 AUTOHEADER = autoheader