diff options
| author | Jerome Forissier <jerome.forissier@linaro.org> | 2014-11-06 17:54:51 +0100 |
|---|---|---|
| committer | Jerome Forissier <jerome.forissier@linaro.org> | 2014-11-07 17:46:17 +0100 |
| commit | fe52b1f588403d8145ef1de326985460a3b1a2da (patch) | |
| tree | 0bceba29a251f3c5405aa5e2ec2e698277d738df /mk/checkconf.mk | |
| parent | f8baf58212bbc46b21fb305419ddc0315ab1568d (diff) | |
core: create conf.h from CFG_* Makefile variables
Simplify the use of makefile configuration variables from C code.
With this patch, one can #include <generated/conf.h> instead of adding
CPP flags definitions to the .mk files.
- CFG_* variables that are set to 'y' are converted to: #define CFG_FOO 1
- Undefined variables, or variables set to 'n' remain undefined in conf.h
- CFG_* variables with any other value are output unchanged
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
Diffstat (limited to 'mk/checkconf.mk')
| -rw-r--r-- | mk/checkconf.mk | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/mk/checkconf.mk b/mk/checkconf.mk new file mode 100644 index 00000000..863b81ad --- /dev/null +++ b/mk/checkconf.mk @@ -0,0 +1,54 @@ +# Generate/check/update a .h file to reflect the values of Makefile +# variables +# +# Example usage (by default, check-conf-h will consider all CFG_* +# variables): +# +# 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; \ + echo ' 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; \ + if [ -r $@ ] && cmp -s $@ $@.tmp; then \ + rm -f $@.tmp; \ + else \ + echo ' UPD $@'; \ + mv $@.tmp $@; \ + fi +endef + +define cfg-vars-by-prefix + $(strip $(if $(1),$(call _cfg-vars-by-prefix,$(1)), + $(call _cfg-vars-by-prefix,CFG_))) +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 $1 1 /* '$($1)' */_nl_, + $(if $(filter xn x,x$($1)), + /* $1 is not set ('$($1)') */_nl_, + #define $1 $($1) /* '$($1)' */_nl_))) +endef |