Show error messages when collecting the package info

SVN-Revision: 4573

openwrt/Makefile

@@ -44,7 +44,7 @@ endif
 	@echo Collecting package info...
 	@-for dir in package/*/; do \
 		echo Source-Makefile: $${dir}Makefile; \
-		$(NO_TRACE_MAKE) --no-print-dir DUMP=1 -C $$dir 2>&- || echo "ERROR: please fix $${dir}Makefile" >&2; \
+		$(NO_TRACE_MAKE) --no-print-dir DUMP=1 -C $$dir || echo "ERROR: please fix $${dir}Makefile" >&2; \
 	done > $@
 
 pkginfo-clean: FORCE

openwrt/include/package.mk

@@ -16,10 +16,12 @@ define Build/DefaultTargets
   ifeq ($(DUMP),)
     ifeq ($(CONFIG_AUTOREBUILD),y)
       ifneq ($$(shell $(SCRIPT_DIR)/timestamp.pl -p $(PKG_BUILD_DIR) .),$(PKG_BUILD_DIR))
+	$$(warning package has changed, need to rebuild $(subst $(TOPDIR)/,,$(PKG_BUILD_DIR)))
         $(PKG_BUILD_DIR)/.prepared: package-clean
       endif
 
       ifneq ($$(shell $(SCRIPT_DIR)/timestamp.pl -p -x ipkg -x ipkg-install $(IPKG_$(1)) $(PKG_BUILD_DIR)),$(IPKG_$(1)))
+	$$(warning $(subst $(TOPDIR)/,,$(PKG_BUILD_DIR)) has changed, need to rebuild $(subst $(TOPDIR)/,,$(IPKG_$(1))))
         $(PKG_BUILD_DIR)/.built: package-rebuild
       endif
     endif