xref: /optee_os/mk/checkconf.mk (revision 75200110483dcee11cdcf4cef3d0ac4d92f63c14) 
1# Generate/check/update a .h file to reflect the values of Makefile
2# variables
3#
4# Example usage (by default, check-conf-h will consider all CFG_*
5# and _CFG_* variables plus PLATFORM_*):
6#
7# path/to/conf.h: FORCE
8#	$(call check-conf-h)
9#
10# Or, to include only the variables with the given prefix(es):
11#
12# path/to/crypto_config.h: FORCE
13#	$(call check-conf-h,CFG_CRYPTO_ CRYPTO_)
14define check-conf-h
15	$(q)set -e;						\
16	$(cmd-echo-silent) '  CHK     $@';			\
17	cnf='$(strip $(foreach var,				\
18		$(call cfg-vars-by-prefix,$1),			\
19		$(call cfg-make-define,$(var))))';		\
20	guard="_`echo $@ | tr -- -/. ___`_";			\
21	mkdir -p $(dir $@);					\
22	echo "#ifndef $${guard}" >$@.tmp;			\
23	echo "#define $${guard}" >>$@.tmp;			\
24	echo -n "$${cnf}" | sed 's/_nl_ */\n/g' >>$@.tmp;	\
25	echo "#endif" >>$@.tmp;					\
26	$(call mv-if-changed,$@.tmp,$@)
27endef
28
29define check-conf-mk
30	$(q)set -e;						\
31	$(cmd-echo-silent) '  CHK     $@';			\
32	cnf='$(strip $(foreach var,				\
33		$(call cfg-vars-by-prefix,CFG_),		\
34		$(strip $(var)=$($(var))_nl_)))';		\
35	mkdir -p $(dir $@);					\
36	echo "# auto-generated TEE configuration file" >$@.tmp; \
37	echo "# TEE version ${TEE_IMPL_VERSION}" >>$@.tmp; \
38	echo "ARCH=${ARCH}" >>$@.tmp;				\
39	echo "PLATFORM=${PLATFORM}" >>$@.tmp;			\
40	echo "PLATFORM_FLAVOR=${PLATFORM_FLAVOR}" >>$@.tmp; 	\
41	echo -n "$${cnf}" | sed 's/_nl_ */\n/g' >>$@.tmp;	\
42	$(call mv-if-changed,$@.tmp,$@)
43endef
44
45# Rename $1 to $2 only if file content differs. Otherwise just delete $1.
46define mv-if-changed
47	if cmp -s $2 $1; then					\
48		rm -f $1;					\
49	else							\
50		$(cmd-echo-silent) '  UPD     $2';		\
51		mv $1 $2;					\
52	fi
53endef
54
55define cfg-vars-by-prefix
56	$(strip $(if $(1),$(call _cfg-vars-by-prefix,$(1)),
57			  $(call _cfg-vars-by-prefix,CFG_ _CFG_ PLATFORM_)))
58endef
59
60define _cfg-vars-by-prefix
61	$(sort $(foreach prefix,$(1),$(filter $(prefix)%,$(.VARIABLES))))
62endef
63
64# Convert a makefile variable to a #define
65# <undefined>, n => <undefined>
66# y              => 1
67# <other value>  => <other value>
68define cfg-make-define
69	$(strip $(if $(filter y,$($1)),
70		     #define $1 1_nl_,
71		     $(if $(filter xn x,x$($1)),
72			  /* $1 is not set */_nl_,
73			  #define $1 $($1)_nl_)))
74endef
75
76# Returns 'y' if at least one variable is 'y', empty otherwise
77# Example:
78# FOO_OR_BAR := $(call cfg-one-enabled, FOO BAR)
79cfg-one-enabled = $(if $(filter y, $(foreach var,$(1),$($(var)))),y,)
80
81# Returns 'y' if all variables are 'y', empty otherwise
82# Example:
83# FOO_AND_BAR := $(call cfg-all-enabled, FOO BAR)
84cfg-all-enabled =                                                             \
85    $(strip                                                                   \
86        $(if $(1),                                                            \
87            $(if $(filter y,$($(firstword $(1)))),                            \
88                $(call cfg-all-enabled,$(filter-out $(firstword $(1)),$(1))), \
89             ),                                                               \
90            y                                                                 \
91         )                                                                    \
92     )
93
94# Disable a configuration variable if some dependency is disabled
95# Example:
96# $(eval $(call cfg-depends-all,FOO,BAR BAZ))
97# Will clear FOO if it is initially 'y' and BAR or BAZ are not 'y'
98cfg-depends-all =                                                           \
99    $(strip                                                                 \
100        $(if $(filter y, $($(1))),                                          \
101            $(if $(call cfg-all-enabled,$(2)),                              \
102                ,                                                           \
103                $(warning Warning: Disabling $(1) [requires $(strip $(2))]) \
104                    override $(1) :=                                        \
105             )                                                              \
106         )                                                                  \
107     )
108
109# Disable a configuration variable if all dependencies are disabled
110# Example:
111# $(eval $(call cfg-depends-one,FOO,BAR BAZ))
112# Will clear FOO if it is initially 'y' and both BAR and BAZ are not 'y'
113cfg-depends-one =                                                                    \
114    $(strip                                                                          \
115        $(if $(filter y, $($(1))),                                                   \
116            $(if $(call cfg-one-enabled,$(2)),                                       \
117                ,                                                                    \
118                $(warning Warning: Disabling $(1) [requires (one of) $(strip $(2))]) \
119                    override $(1) :=                                                 \
120             )                                                                       \
121         )                                                                           \
122     )
123
124
125# Enable all depend variables
126# Example:
127# $(eval $(call cfg-enable-all-depends,FOO,BAR BAZ))
128# Will enable BAR and BAZ if FOO is initially 'y'
129cfg-enable-all-depends =                                                                   \
130    $(strip                                                                                \
131        $(if $(2),                                                                         \
132            $(if $(filter y, $($(1))),                                                     \
133                $(if $(filter y,$($(firstword $(2)))),                                     \
134                    ,                                                                      \
135                    $(warning Warning: Enabling $(firstword $(2)) [required by $(1)])      \
136                        $(eval override $(firstword $(2)) := y)                            \
137                 )                                                                         \
138                 $(call cfg-enable-all-depends,$(1),$(filter-out $(firstword $(2)),$(2))), \
139             )                                                                             \
140             ,                                                                             \
141        )                                                                                  \
142     )
143
144# Set a variable or error out if it was previously set to a different value
145# The reason message (3rd parameter) is optional
146# Example:
147# $(call force,CFG_FOO,foo,required by CFG_BAR)
148define force
149$(eval $(call _force,$(1),$(2),$(3)))
150endef
151
152define _force
153ifdef $(1)
154ifneq ($($(1)),$(2))
155ifneq (,$(3))
156_reason := $$(_empty) [$(3)]
157endif
158$$(error $(1) is set to '$($(1))' (from $(origin $(1))) but its value must be '$(2)'$$(_reason))
159endif
160endif
161$(1) := $(2)
162endef
163