include: test build prereqs before preparing tempinfo

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

SVN-Revision: 44270

include/toplevel.mk

@@ -66,6 +66,7 @@ ULIMIT_FIX=_limit=`ulimit -n`; [ "$$_limit" = "unlimited" -o "$$_limit" -ge 1024
 prepare-mk: FORCE ;
 
 prepare-tmpinfo: FORCE
+	@+$(MAKE) -r -s tmp/.prereq-build $(PREP_MK)
 	mkdir -p tmp/info
 	$(_SINGLE)$(NO_TRACE_MAKE) -j1 -r -s -f include/scan.mk SCAN_TARGET="packageinfo" SCAN_DIR="package" SCAN_NAME="package" SCAN_DEPS="$(TOPDIR)/include/package*.mk $(TOPDIR)/overlay/*/*.mk" SCAN_DEPTH=5 SCAN_EXTRA=""
 	$(_SINGLE)$(NO_TRACE_MAKE) -j1 -r -s -f include/scan.mk SCAN_TARGET="targetinfo" SCAN_DIR="target/linux" SCAN_NAME="target" SCAN_DEPS="profiles/*.mk $(TOPDIR)/include/kernel*.mk $(TOPDIR)/include/target.mk" SCAN_DEPTH=2 SCAN_EXTRA="" SCAN_MAKEOPTS="TARGET_BUILD=1"
@@ -157,7 +158,6 @@ clean dirclean: .config
 	@+$(SUBMAKE) -r $@ 
 
 prereq:: prepare-tmpinfo .config
-	@+$(MAKE) -r -s tmp/.prereq-build $(PREP_MK)
 	@+$(NO_TRACE_MAKE) -r -s $@
 
 ifeq ($(SDK),1)