build: move tmp/.prereq-build to staging_dir/host to gracefully handle staging_dir deletion

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 44551

include/toplevel.mk

@@ -53,7 +53,7 @@ else
 endif
 
 ifeq ($(FORCE),)
-  .config scripts/config/conf scripts/config/mconf: tmp/.prereq-build
+  .config scripts/config/conf scripts/config/mconf: staging_dir/host/.prereq-build
 endif
 
 SCAN_COOKIE?=$(shell echo $$$$)
@@ -66,7 +66,7 @@ ULIMIT_FIX=_limit=`ulimit -n`; [ "$$_limit" = "unlimited" -o "$$_limit" -ge 1024
 prepare-mk: FORCE ;
 
 prepare-tmpinfo: FORCE
-	@+$(MAKE) -r -s tmp/.prereq-build $(PREP_MK)
+	@+$(MAKE) -r -s staging_dir/host/.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"
@@ -136,7 +136,7 @@ kernel_menuconfig: prepare_kernel_conf
 kernel_nconfig: prepare_kernel_conf
 	$(_SINGLE)$(NO_TRACE_MAKE) -C target/linux nconfig
 
-tmp/.prereq-build: include/prereq-build.mk
+staging_dir/host/.prereq-build: include/prereq-build.mk
 	mkdir -p tmp
 	rm -f tmp/.host.mk
 	@$(_SINGLE)$(NO_TRACE_MAKE) -j1 -r -s -f $(TOPDIR)/include/prereq-build.mk prereq 2>/dev/null || { \
@@ -202,7 +202,7 @@ distclean:
 	@$(_SINGLE)$(SUBMAKE) -C scripts/config clean
 
 ifeq ($(findstring v,$(DEBUG)),)
-  .SILENT: symlinkclean clean dirclean distclean config-clean download help tmpinfo-clean .config scripts/config/mconf scripts/config/conf menuconfig tmp/.prereq-build tmp/.prereq-package prepare-tmpinfo
+  .SILENT: symlinkclean clean dirclean distclean config-clean download help tmpinfo-clean .config scripts/config/mconf scripts/config/conf menuconfig staging_dir/host/.prereq-build tmp/.prereq-package prepare-tmpinfo
 endif
 .PHONY: help FORCE
 .NOTPARALLEL: