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b1992c3772
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:
src := $(obj)
When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.
This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.
To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.
Going forward, the variables used in Makefiles will have the following
meanings:
$(obj) - directory in the object tree
$(src) - directory in the source tree (changed by this commit)
$(objtree) - the top of the kernel object tree
$(srctree) - the top of the kernel source tree
Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
235 lines
8.4 KiB
Makefile
235 lines
8.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ===========================================================================
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# Kernel configuration targets
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# These targets are used from top-level makefile
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ifdef KBUILD_KCONFIG
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Kconfig := $(KBUILD_KCONFIG)
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else
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Kconfig := Kconfig
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endif
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ifndef KBUILD_DEFCONFIG
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KBUILD_DEFCONFIG := defconfig
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endif
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ifeq ($(quiet),silent_)
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silent := -s
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endif
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export KCONFIG_DEFCONFIG_LIST :=
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ifndef cross_compiling
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kernel-release := $(shell uname -r)
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KCONFIG_DEFCONFIG_LIST += \
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/lib/modules/$(kernel-release)/.config \
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/etc/kernel-config \
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/boot/config-$(kernel-release)
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endif
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KCONFIG_DEFCONFIG_LIST += arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)
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ifneq ($(findstring c, $(KBUILD_EXTRA_WARN)),)
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export KCONFIG_WARN_UNKNOWN_SYMBOLS=1
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endif
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ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),)
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export KCONFIG_WERROR=1
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endif
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# We need this, in case the user has it in its environment
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unexport CONFIG_
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config-prog := conf
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menuconfig-prog := mconf
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nconfig-prog := nconf
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gconfig-prog := gconf
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xconfig-prog := qconf
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define config_rule
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PHONY += $(1)
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$(1): $(obj)/$($(1)-prog)
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$(Q)$$< $(silent) $(Kconfig)
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PHONY += build_$(1)
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build_$(1): $(obj)/$($(1)-prog)
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endef
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$(foreach c, config menuconfig nconfig gconfig xconfig, $(eval $(call config_rule,$(c))))
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PHONY += localmodconfig localyesconfig
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localyesconfig localmodconfig: $(obj)/conf
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$(Q)$(PERL) $(src)/streamline_config.pl --$@ $(srctree) $(Kconfig) > .tmp.config
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$(Q)if [ -f .config ]; then \
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cmp -s .tmp.config .config || \
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(mv -f .config .config.old.1; \
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mv -f .tmp.config .config; \
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$< $(silent) --oldconfig $(Kconfig); \
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mv -f .config.old.1 .config.old) \
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else \
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mv -f .tmp.config .config; \
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$< $(silent) --oldconfig $(Kconfig); \
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fi
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$(Q)rm -f .tmp.config
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# These targets map 1:1 to the commandline options of 'conf'
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#
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# Note:
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# syncconfig has become an internal implementation detail and is now
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# deprecated for external use
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simple-targets := oldconfig allnoconfig allyesconfig allmodconfig \
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alldefconfig randconfig listnewconfig olddefconfig syncconfig \
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helpnewconfig yes2modconfig mod2yesconfig mod2noconfig
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PHONY += $(simple-targets)
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$(simple-targets): $(obj)/conf
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$(Q)$< $(silent) --$@ $(Kconfig)
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PHONY += savedefconfig defconfig
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savedefconfig: $(obj)/conf
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$(Q)$< $(silent) --$@=defconfig $(Kconfig)
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defconfig: $(obj)/conf
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ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
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@$(kecho) "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
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$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG) $(Kconfig)
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else
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@$(kecho) "*** Default configuration is based on target '$(KBUILD_DEFCONFIG)'"
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$(Q)$(MAKE) -f $(srctree)/Makefile $(KBUILD_DEFCONFIG)
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endif
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%_defconfig: $(obj)/conf
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$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
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configfiles = $(wildcard $(srctree)/kernel/configs/$(1) $(srctree)/arch/$(SRCARCH)/configs/$(1))
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all-config-fragments = $(call configfiles,*.config)
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config-fragments = $(call configfiles,$@)
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%.config: $(obj)/conf
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$(if $(config-fragments),, $(error $@ fragment does not exists on this architecture))
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$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m $(KCONFIG_CONFIG) $(config-fragments)
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$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
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PHONY += tinyconfig
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tinyconfig:
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$(Q)KCONFIG_ALLCONFIG=kernel/configs/tiny-base.config $(MAKE) -f $(srctree)/Makefile allnoconfig
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$(Q)$(MAKE) -f $(srctree)/Makefile tiny.config
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# CHECK: -o cache_dir=<path> working?
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PHONY += testconfig
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testconfig: $(obj)/conf
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$(Q)$(PYTHON3) -B -m pytest $(src)/tests \
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-o cache_dir=$(abspath $(obj)/tests/.cache) \
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$(if $(findstring 1,$(KBUILD_VERBOSE)),--capture=no)
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clean-files += tests/.cache
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# Help text used by make help
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help:
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@echo 'Configuration targets:'
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@echo ' config - Update current config utilising a line-oriented program'
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@echo ' nconfig - Update current config utilising a ncurses menu based program'
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@echo ' menuconfig - Update current config utilising a menu based program'
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@echo ' xconfig - Update current config utilising a Qt based front-end'
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@echo ' gconfig - Update current config utilising a GTK+ based front-end'
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@echo ' oldconfig - Update current config utilising a provided .config as base'
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@echo ' localmodconfig - Update current config disabling modules not loaded'
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@echo ' except those preserved by LMC_KEEP environment variable'
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@echo ' localyesconfig - Update current config converting local mods to core'
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@echo ' except those preserved by LMC_KEEP environment variable'
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@echo ' defconfig - New config with default from ARCH supplied defconfig'
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@echo ' savedefconfig - Save current config as ./defconfig (minimal config)'
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@echo ' allnoconfig - New config where all options are answered with no'
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@echo ' allyesconfig - New config where all options are accepted with yes'
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@echo ' allmodconfig - New config selecting modules when possible'
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@echo ' alldefconfig - New config with all symbols set to default'
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@echo ' randconfig - New config with random answer to all options'
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@echo ' yes2modconfig - Change answers from yes to mod if possible'
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@echo ' mod2yesconfig - Change answers from mod to yes if possible'
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@echo ' mod2noconfig - Change answers from mod to no if possible'
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@echo ' listnewconfig - List new options'
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@echo ' helpnewconfig - List new options and help text'
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@echo ' olddefconfig - Same as oldconfig but sets new symbols to their'
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@echo ' default value without prompting'
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@echo ' tinyconfig - Configure the tiniest possible kernel'
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@echo ' testconfig - Run Kconfig unit tests (requires python3 and pytest)'
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@echo ''
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@echo 'Configuration topic targets:'
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@$(foreach f, $(all-config-fragments), \
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if help=$$(grep -m1 '^# Help: ' $(f)); then \
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printf ' %-25s - %s\n' '$(notdir $(f))' "$${help#*: }"; \
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fi;)
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# ===========================================================================
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# object files used by all kconfig flavours
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common-objs := confdata.o expr.o lexer.lex.o menu.o parser.tab.o \
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preprocess.o symbol.o util.o
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$(obj)/lexer.lex.o: $(obj)/parser.tab.h
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HOSTCFLAGS_lexer.lex.o := -I $(src)
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HOSTCFLAGS_parser.tab.o := -I $(src)
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# conf: Used for defconfig, oldconfig and related targets
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hostprogs += conf
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conf-objs := conf.o $(common-objs)
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# nconf: Used for the nconfig target based on ncurses
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hostprogs += nconf
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nconf-objs := nconf.o nconf.gui.o mnconf-common.o $(common-objs)
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HOSTLDLIBS_nconf = $(call read-file, $(obj)/nconf-libs)
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HOSTCFLAGS_nconf.o = $(call read-file, $(obj)/nconf-cflags)
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HOSTCFLAGS_nconf.gui.o = $(call read-file, $(obj)/nconf-cflags)
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$(obj)/nconf: | $(obj)/nconf-libs
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$(obj)/nconf.o $(obj)/nconf.gui.o: | $(obj)/nconf-cflags
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# mconf: Used for the menuconfig target based on lxdialog
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hostprogs += mconf
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lxdialog := $(addprefix lxdialog/, \
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checklist.o inputbox.o menubox.o textbox.o util.o yesno.o)
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mconf-objs := mconf.o $(lxdialog) mnconf-common.o $(common-objs)
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HOSTLDLIBS_mconf = $(call read-file, $(obj)/mconf-libs)
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$(foreach f, mconf.o $(lxdialog), \
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$(eval HOSTCFLAGS_$f = $$(call read-file, $(obj)/mconf-cflags)))
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$(obj)/mconf: | $(obj)/mconf-libs
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$(addprefix $(obj)/, mconf.o $(lxdialog)): | $(obj)/mconf-cflags
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# qconf: Used for the xconfig target based on Qt
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hostprogs += qconf
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qconf-cxxobjs := qconf.o qconf-moc.o
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qconf-objs := images.o $(common-objs)
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HOSTLDLIBS_qconf = $(call read-file, $(obj)/qconf-libs)
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HOSTCXXFLAGS_qconf.o = -std=c++11 -fPIC $(call read-file, $(obj)/qconf-cflags)
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HOSTCXXFLAGS_qconf-moc.o = -std=c++11 -fPIC $(call read-file, $(obj)/qconf-cflags)
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$(obj)/qconf: | $(obj)/qconf-libs
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$(obj)/qconf.o $(obj)/qconf-moc.o: | $(obj)/qconf-cflags
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quiet_cmd_moc = MOC $@
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cmd_moc = $(call read-file, $(obj)/qconf-bin)/moc $< -o $@
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$(obj)/qconf-moc.cc: $(src)/qconf.h FORCE | $(obj)/qconf-bin
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$(call if_changed,moc)
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targets += qconf-moc.cc
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# gconf: Used for the gconfig target based on GTK+
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hostprogs += gconf
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gconf-objs := gconf.o images.o $(common-objs)
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HOSTLDLIBS_gconf = $(call read-file, $(obj)/gconf-libs)
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HOSTCFLAGS_gconf.o = $(call read-file, $(obj)/gconf-cflags)
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$(obj)/gconf: | $(obj)/gconf-libs
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$(obj)/gconf.o: | $(obj)/gconf-cflags
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# check if necessary packages are available, and configure build flags
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cmd_conf_cfg = $< $(addprefix $(obj)/$*conf-, cflags libs bin); touch $(obj)/$*conf-bin
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$(obj)/%conf-cflags $(obj)/%conf-libs $(obj)/%conf-bin: $(src)/%conf-cfg.sh
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$(call cmd,conf_cfg)
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clean-files += *conf-cflags *conf-libs *conf-bin
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