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https://github.com/torvalds/linux
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feec5e1f74
Currently the Kconfig fragments in kernel/configs and arch/*/configs that aren't used internally aren't discoverable through "make help", which consists of hard-coded lists of config fragments. Instead, list all the fragment targets that have a "# Help: " comment prefix so the targets can be generated dynamically. Add logic to the Makefile to search for and display the fragment and comment. Add comments to fragments that are intended to be direct targets. Signed-off-by: Kees Cook <keescook@chromium.org> Co-developed-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Nicolas Schier <nicolas@fjasle.eu> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
227 lines
8.3 KiB
Makefile
227 lines
8.3 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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# 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) $(srctree)/$(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 .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 $(srctree)/$(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 $(srctree)/$(src)
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HOSTCFLAGS_parser.tab.o := -I $(srctree)/$(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 $(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) $(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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