Merge changes I627eb724,I55d5865b

* changes:
  configure: add a test for configured source dir
  Makefile: add distclean target

build/make/Makefile

@@ -94,6 +94,16 @@ clean::
 	rm -f $(OBJS-yes) $(OBJS-yes:.o=.d) $(OBJS-yes:.asm.s.o=.asm.s)
 	rm -f $(CLEAN-OBJS)
 
+.PHONY: clean
+distclean: clean
+	if [ -z "$(target)" ]; then \
+      rm -f Makefile; \
+      rm -f config.log config.mk; \
+      rm -f vpx_config.[hc] vpx_config.asm; \
+    else \
+      rm -f $(target)-$(TOOLCHAIN).mk; \
+    fi
+
 .PHONY: dist
 dist:
 .PHONY: install
@@ -307,7 +317,7 @@ endef
 ifneq ($(target),)
 include $(SRC_PATH_BARE)/$(target:-$(TOOLCHAIN)=).mk
 endif
-ifeq ($(filter clean,$(MAKECMDGOALS)),)
+ifeq ($(filter %clean,$(MAKECMDGOALS)),)
   # Older versions of make don't like -include directives with no arguments
   ifneq ($(filter %.d,$(OBJS-yes:.o=.d)),)
     -include $(filter %.d,$(OBJS-yes:.o=.d))

configure

@@ -166,6 +166,14 @@ for util in make perl; do
     fi
 done
 
+
+if [ "`cd ${source_path} && pwd`" != "`pwd`" ]; then
+  # test to see if source_path already configured
+  if [ -f ${source_path}/vpx_config.h ]; then
+    die "source directory already configured; run 'make distclean' there first"
+  fi
+fi
+
 # check installed doxygen version
 doxy_version=$(doxygen --version 2>/dev/null)
 doxy_major=${doxy_version%%.*}