1# SPDX-License-Identifier: GPL-2.0
2# ===========================================================================
3# Kernel configuration targets
4# These targets are used from top-level makefile
5
6ifdef KBUILD_KCONFIG
7Kconfig := $(KBUILD_KCONFIG)
8else
9Kconfig := Kconfig
10endif
11
12ifndef KBUILD_DEFCONFIG
13KBUILD_DEFCONFIG := defconfig
14endif
15
16ifeq ($(quiet),silent_)
17silent := -s
18endif
19
20export KCONFIG_DEFCONFIG_LIST :=
21ifndef cross_compiling
22kernel-release := $(shell uname -r)
23KCONFIG_DEFCONFIG_LIST += \
24	/lib/modules/$(kernel-release)/.config \
25	/etc/kernel-config \
26	/boot/config-$(kernel-release)
27endif
28KCONFIG_DEFCONFIG_LIST += arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)
29
30# We need this, in case the user has it in its environment
31unexport CONFIG_
32
33config-prog	:= conf
34menuconfig-prog	:= mconf
35nconfig-prog	:= nconf
36gconfig-prog	:= gconf
37xconfig-prog	:= qconf
38
39define config_rule
40PHONY += $(1)
41$(1): $(obj)/$($(1)-prog)
42	$(Q)$$< $(silent) $(Kconfig)
43
44PHONY += build_$(1)
45build_$(1): $(obj)/$($(1)-prog)
46endef
47
48$(foreach c, config menuconfig nconfig gconfig xconfig, $(eval $(call config_rule,$(c))))
49
50PHONY += localmodconfig localyesconfig
51localyesconfig localmodconfig: $(obj)/conf
52	$(Q)$(PERL) $(srctree)/$(src)/streamline_config.pl --$@ $(srctree) $(Kconfig) > .tmp.config
53	$(Q)if [ -f .config ]; then 				\
54		cmp -s .tmp.config .config ||			\
55		(mv -f .config .config.old.1;			\
56		 mv -f .tmp.config .config;			\
57		 $< $(silent) --oldconfig $(Kconfig);		\
58		 mv -f .config.old.1 .config.old)		\
59	else							\
60		mv -f .tmp.config .config;			\
61		$< $(silent) --oldconfig $(Kconfig);		\
62	fi
63	$(Q)rm -f .tmp.config
64
65# These targets map 1:1 to the commandline options of 'conf'
66#
67# Note:
68#  syncconfig has become an internal implementation detail and is now
69#  deprecated for external use
70simple-targets := oldconfig allnoconfig allyesconfig allmodconfig \
71	alldefconfig randconfig listnewconfig olddefconfig syncconfig \
72	helpnewconfig yes2modconfig mod2yesconfig mod2noconfig
73
74PHONY += $(simple-targets)
75
76$(simple-targets): $(obj)/conf
77	$(Q)$< $(silent) --$@ $(Kconfig)
78
79PHONY += savedefconfig defconfig
80
81savedefconfig: $(obj)/conf
82	$(Q)$< $(silent) --$@=defconfig $(Kconfig)
83
84defconfig: $(obj)/conf
85ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)),)
86	@$(kecho) "*** Default configuration is based on '$(KBUILD_DEFCONFIG)'"
87	$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG) $(Kconfig)
88else
89	@$(kecho) "*** Default configuration is based on target '$(KBUILD_DEFCONFIG)'"
90	$(Q)$(MAKE) -f $(srctree)/Makefile $(KBUILD_DEFCONFIG)
91endif
92
93%_defconfig: $(obj)/conf
94	$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
95
96configfiles = $(wildcard $(srctree)/kernel/configs/$(1) $(srctree)/arch/$(SRCARCH)/configs/$(1))
97all-config-fragments = $(call configfiles,*.config)
98config-fragments = $(call configfiles,$@)
99
100%.config: $(obj)/conf
101	$(if $(config-fragments),, $(error $@ fragment does not exists on this architecture))
102	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(config-fragments)
103	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
104
105PHONY += tinyconfig
106tinyconfig:
107	$(Q)KCONFIG_ALLCONFIG=kernel/configs/tiny-base.config $(MAKE) -f $(srctree)/Makefile allnoconfig
108	$(Q)$(MAKE) -f $(srctree)/Makefile tiny.config
109
110# CHECK: -o cache_dir=<path> working?
111PHONY += testconfig
112testconfig: $(obj)/conf
113	$(Q)$(PYTHON3) -B -m pytest $(srctree)/$(src)/tests \
114	-o cache_dir=$(abspath $(obj)/tests/.cache) \
115	$(if $(findstring 1,$(KBUILD_VERBOSE)),--capture=no)
116clean-files += tests/.cache
117
118# Help text used by make help
119help:
120	@echo  'Configuration targets:'
121	@echo  '  config	  - Update current config utilising a line-oriented program'
122	@echo  '  nconfig         - Update current config utilising a ncurses menu based program'
123	@echo  '  menuconfig	  - Update current config utilising a menu based program'
124	@echo  '  xconfig	  - Update current config utilising a Qt based front-end'
125	@echo  '  gconfig	  - Update current config utilising a GTK+ based front-end'
126	@echo  '  oldconfig	  - Update current config utilising a provided .config as base'
127	@echo  '  localmodconfig  - Update current config disabling modules not loaded'
128	@echo  '                    except those preserved by LMC_KEEP environment variable'
129	@echo  '  localyesconfig  - Update current config converting local mods to core'
130	@echo  '                    except those preserved by LMC_KEEP environment variable'
131	@echo  '  defconfig	  - New config with default from ARCH supplied defconfig'
132	@echo  '  savedefconfig   - Save current config as ./defconfig (minimal config)'
133	@echo  '  allnoconfig	  - New config where all options are answered with no'
134	@echo  '  allyesconfig	  - New config where all options are accepted with yes'
135	@echo  '  allmodconfig	  - New config selecting modules when possible'
136	@echo  '  alldefconfig    - New config with all symbols set to default'
137	@echo  '  randconfig	  - New config with random answer to all options'
138	@echo  '  yes2modconfig	  - Change answers from yes to mod if possible'
139	@echo  '  mod2yesconfig	  - Change answers from mod to yes if possible'
140	@echo  '  mod2noconfig	  - Change answers from mod to no if possible'
141	@echo  '  listnewconfig   - List new options'
142	@echo  '  helpnewconfig   - List new options and help text'
143	@echo  '  olddefconfig	  - Same as oldconfig but sets new symbols to their'
144	@echo  '                    default value without prompting'
145	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
146	@echo  '  testconfig	  - Run Kconfig unit tests (requires python3 and pytest)'
147	@echo  ''
148	@echo  'Configuration topic targets:'
149	@$(foreach f, $(all-config-fragments), \
150		if help=$$(grep -m1 '^# Help: ' $(f)); then \
151			printf '  %-25s - %s\n' '$(notdir $(f))' "$${help#*: }"; \
152		fi;)
153
154# ===========================================================================
155# object files used by all kconfig flavours
156common-objs	:= confdata.o expr.o lexer.lex.o menu.o parser.tab.o \
157		   preprocess.o symbol.o util.o
158
159$(obj)/lexer.lex.o: $(obj)/parser.tab.h
160HOSTCFLAGS_lexer.lex.o	:= -I $(srctree)/$(src)
161HOSTCFLAGS_parser.tab.o	:= -I $(srctree)/$(src)
162
163# conf: Used for defconfig, oldconfig and related targets
164hostprogs	+= conf
165conf-objs	:= conf.o $(common-objs)
166
167# nconf: Used for the nconfig target based on ncurses
168hostprogs	+= nconf
169nconf-objs	:= nconf.o nconf.gui.o $(common-objs)
170
171HOSTLDLIBS_nconf       = $(call read-file, $(obj)/nconf-libs)
172HOSTCFLAGS_nconf.o     = $(call read-file, $(obj)/nconf-cflags)
173HOSTCFLAGS_nconf.gui.o = $(call read-file, $(obj)/nconf-cflags)
174
175$(obj)/nconf: | $(obj)/nconf-libs
176$(obj)/nconf.o $(obj)/nconf.gui.o: | $(obj)/nconf-cflags
177
178# mconf: Used for the menuconfig target based on lxdialog
179hostprogs	+= mconf
180lxdialog	:= $(addprefix lxdialog/, \
181		     checklist.o inputbox.o menubox.o textbox.o util.o yesno.o)
182mconf-objs	:= mconf.o $(lxdialog) $(common-objs)
183
184HOSTLDLIBS_mconf = $(call read-file, $(obj)/mconf-libs)
185$(foreach f, mconf.o $(lxdialog), \
186  $(eval HOSTCFLAGS_$f = $$(call read-file, $(obj)/mconf-cflags)))
187
188$(obj)/mconf: | $(obj)/mconf-libs
189$(addprefix $(obj)/, mconf.o $(lxdialog)): | $(obj)/mconf-cflags
190
191# qconf: Used for the xconfig target based on Qt
192hostprogs	+= qconf
193qconf-cxxobjs	:= qconf.o qconf-moc.o
194qconf-objs	:= images.o $(common-objs)
195
196HOSTLDLIBS_qconf         = $(call read-file, $(obj)/qconf-libs)
197HOSTCXXFLAGS_qconf.o     = -std=c++11 -fPIC $(call read-file, $(obj)/qconf-cflags)
198HOSTCXXFLAGS_qconf-moc.o = -std=c++11 -fPIC $(call read-file, $(obj)/qconf-cflags)
199$(obj)/qconf: | $(obj)/qconf-libs
200$(obj)/qconf.o $(obj)/qconf-moc.o: | $(obj)/qconf-cflags
201
202quiet_cmd_moc = MOC     $@
203      cmd_moc = $(call read-file, $(obj)/qconf-bin)/moc $< -o $@
204
205$(obj)/qconf-moc.cc: $(src)/qconf.h FORCE | $(obj)/qconf-bin
206	$(call if_changed,moc)
207
208targets += qconf-moc.cc
209
210# gconf: Used for the gconfig target based on GTK+
211hostprogs	+= gconf
212gconf-objs	:= gconf.o images.o $(common-objs)
213
214HOSTLDLIBS_gconf   = $(call read-file, $(obj)/gconf-libs)
215HOSTCFLAGS_gconf.o = $(call read-file, $(obj)/gconf-cflags)
216
217$(obj)/gconf: | $(obj)/gconf-libs
218$(obj)/gconf.o: | $(obj)/gconf-cflags
219
220# check if necessary packages are available, and configure build flags
221cmd_conf_cfg = $< $(addprefix $(obj)/$*conf-, cflags libs bin); touch $(obj)/$*conf-bin
222
223$(obj)/%conf-cflags $(obj)/%conf-libs $(obj)/%conf-bin: $(src)/%conf-cfg.sh
224	$(call cmd,conf_cfg)
225
226clean-files += *conf-cflags *conf-libs *conf-bin
227