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Diffstat (limited to 'mk/checkconf.mk')
| -rw-r--r-- | mk/checkconf.mk | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/mk/checkconf.mk b/mk/checkconf.mk new file mode 100644 index 0000000..b40af81 --- /dev/null +++ b/mk/checkconf.mk @@ -0,0 +1,162 @@ +# Generate/check/update a .h file to reflect the values of Makefile +# variables +# +# Example usage (by default, check-conf-h will consider all CFG_* +# and _CFG_* variables plus PLATFORM_*): +# +# path/to/conf.h: FORCE +# $(call check-conf-h) +# +# Or, to include only the variables with the given prefix(es): +# +# path/to/crypto_config.h: FORCE +# $(call check-conf-h,CFG_CRYPTO_ CRYPTO_) +define check-conf-h + $(q)set -e; \ + $(cmd-echo-silent) ' CHK $@'; \ + cnf='$(strip $(foreach var, \ + $(call cfg-vars-by-prefix,$1), \ + $(call cfg-make-define,$(var))))'; \ + guard="_`echo $@ | tr -- -/. ___`_"; \ + mkdir -p $(dir $@); \ + echo "#ifndef $${guard}" >$@.tmp; \ + echo "#define $${guard}" >>$@.tmp; \ + echo -n "$${cnf}" | sed 's/_nl_ */\n/g' >>$@.tmp; \ + echo "#endif" >>$@.tmp; \ + $(call mv-if-changed,$@.tmp,$@) +endef + +define check-conf-mk + $(q)set -e; \ + $(cmd-echo-silent) ' CHK $@'; \ + cnf='$(strip $(foreach var, \ + $(call cfg-vars-by-prefix,CFG_), \ + $(strip $(var)=$($(var))_nl_)))'; \ + mkdir -p $(dir $@); \ + echo "# auto-generated TEE configuration file" >$@.tmp; \ + echo "# TEE version ${TEE_IMPL_VERSION}" >>$@.tmp; \ + echo "ARCH=${ARCH}" >>$@.tmp; \ + echo "PLATFORM=${PLATFORM}" >>$@.tmp; \ + echo "PLATFORM_FLAVOR=${PLATFORM_FLAVOR}" >>$@.tmp; \ + echo -n "$${cnf}" | sed 's/_nl_ */\n/g' >>$@.tmp; \ + $(call mv-if-changed,$@.tmp,$@) +endef + +# Rename $1 to $2 only if file content differs. Otherwise just delete $1. +define mv-if-changed + if [ -r $2 ] && cmp -s $2 $1; then \ + rm -f $1; \ + else \ + $(cmd-echo-silent) ' UPD $2'; \ + mv $1 $2; \ + fi +endef + +define cfg-vars-by-prefix + $(strip $(if $(1),$(call _cfg-vars-by-prefix,$(1)), + $(call _cfg-vars-by-prefix,CFG_ _CFG_ PLATFORM_))) +endef + +define _cfg-vars-by-prefix + $(sort $(foreach prefix,$(1),$(filter $(prefix)%,$(.VARIABLES)))) +endef + +# Convert a makefile variable to a #define +# <undefined>, n => <undefined> +# y => 1 +# <other value> => <other value> +define cfg-make-define + $(strip $(if $(filter y,$($1)), + #define $1 1_nl_, + $(if $(filter xn x,x$($1)), + /* $1 is not set */_nl_, + #define $1 $($1)_nl_))) +endef + +# Returns 'y' if at least one variable is 'y', empty otherwise +# Example: +# FOO_OR_BAR := $(call cfg-one-enabled, FOO BAR) +cfg-one-enabled = $(if $(filter y, $(foreach var,$(1),$($(var)))),y,) + +# Returns 'y' if all variables are 'y', empty otherwise +# Example: +# FOO_AND_BAR := $(call cfg-all-enabled, FOO BAR) +cfg-all-enabled = \ + $(strip \ + $(if $(1), \ + $(if $(filter y,$($(firstword $(1)))), \ + $(call cfg-all-enabled,$(filter-out $(firstword $(1)),$(1))), \ + ), \ + y \ + ) \ + ) + +# Disable a configuration variable if some dependency is disabled +# Example: +# $(eval $(call cfg-depends-all,FOO,BAR BAZ)) +# Will clear FOO if it is initially 'y' and BAR or BAZ are not 'y' +cfg-depends-all = \ + $(strip \ + $(if $(filter y, $($(1))), \ + $(if $(call cfg-all-enabled,$(2)), \ + , \ + $(warning Warning: Disabling $(1) [requires $(strip $(2))]) \ + override $(1) := \ + ) \ + ) \ + ) + +# Disable a configuration variable if all dependencies are disabled +# Example: +# $(eval $(call cfg-depends-one,FOO,BAR BAZ)) +# Will clear FOO if it is initially 'y' and both BAR and BAZ are not 'y' +cfg-depends-one = \ + $(strip \ + $(if $(filter y, $($(1))), \ + $(if $(call cfg-one-enabled,$(2)), \ + , \ + $(warning Warning: Disabling $(1) [requires (one of) $(strip $(2))]) \ + override $(1) := \ + ) \ + ) \ + ) + + +# Enable all depend variables +# Example: +# $(eval $(call cfg-enable-all-depends,FOO,BAR BAZ)) +# Will enable BAR and BAZ if FOO is initially 'y' +cfg-enable-all-depends = \ + $(strip \ + $(if $(2), \ + $(if $(filter y, $($(1))), \ + $(if $(filter y,$($(firstword $(2)))), \ + , \ + $(warning Warning: Enabling $(firstword $(2)) [required by $(1)]) \ + $(eval override $(firstword $(2)) := y) \ + ) \ + $(call cfg-enable-all-depends,$(1),$(filter-out $(firstword $(2)),$(2))), \ + ) \ + , \ + ) \ + ) + +# Set a variable or error out if it was previously set to a different value +# The reason message (3rd parameter) is optional +# Example: +# $(call force,CFG_FOO,foo,required by CFG_BAR) +define force +$(eval $(call _force,$(1),$(2),$(3))) +endef + +define _force +ifdef $(1) +ifneq ($($(1)),$(2)) +ifneq (,$(3)) +_reason := $$(_empty) [$(3)] +endif +$$(error $(1) is set to '$($(1))' (from $(origin $(1))) but its value must be '$(2)'$$(_reason)) +endif +endif +$(1) := $(2) +endef |