Cross Reference: /linux-master/Makefile

265 objtree		:= .
268 export building_out_of_srctree srctree objtree VPATH
505 RESOLVE_BTFIDS	= $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
537 		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
539 		-I$(objtree)/include/generated/uapi \
547 		-I$(objtree)/arch/$(SRCARCH)/include/generated \
549 		-I$(objtree)/include \
1274 export INSTALL_HDR_PATH = $(objtree)/usr
1338 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1353 	$(Q)mkdir -p $(objtree)/tools
1354 	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1357 	$(Q)mkdir -p $(objtree)/tools
1358 	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1372 	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1374 		xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config