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[BUILD] Generate include/autoconf.mk from board config files

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Use cpp and sed to postprocess config.h and import the defined values
into include/autoconf.mk.  autoconf.mk is then included by config.mk to
give 'make' access to the board configuration.

Doing this enables conditional compilation at the Makefile level instead
of by wrapping every .c file with #ifdef/#endif wrappers.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely 2007-09-24 09:05:31 -06:00
parent f92edbd8a0
commit 2f155f6c0a
3 changed files with 49 additions and 1 deletions
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18
Makefile
View file

@ -342,6 +342,21 @@ $(obj)System.map: $(obj)u-boot
grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
sort > $(obj)System.map
#
# Auto-generate the autoconf.mk file (which is included by all makefiles)
#
# This target actually generates 2 files; autoconf.mk and autoconf.mk.dep.
# the dep file is only include in this top level makefile to determine when
# to regenerate the autoconf.mk file.
$(OBJTREE)/include/autoconf.mk: $(obj)include/config.h
@echo Generating include/autoconf.mk
@# Generate the dependancies
@$(CC) -M $(HOST_CFLAGS) $(CPPFLAGS) -MQ $@ include/common.h > $@.dep
@# Extract the config macros
@$(CPP) $(CFLAGS) -dM include/common.h | sed -n -f tools/scripts/define2mk.sed >> $@
sinclude $(OBJTREE)/include/autoconf.mk.dep
#########################################################################
else
all $(obj)u-boot.hex $(obj)u-boot.srec $(obj)u-boot.bin \
@ -361,7 +376,8 @@ CHANGELOG:
unconfig:
@rm -f $(obj)include/config.h $(obj)include/config.mk \
$(obj)board/*/config.tmp $(obj)board/*/*/config.tmp
$(obj)board/*/config.tmp $(obj)board/*/*/config.tmp \
$(obj)include/autoconf.mk $(obj)include/autoconf.mk.dep
#========================================================================
# PowerPC

3
config.mk
View file

@ -87,6 +87,9 @@ ifdef BOARD
sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules
endif
# Load generated board configuration
sinclude $(OBJTREE)/include/autoconf.mk
#########################################################################
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \

29
tools/scripts/define2mk.sed Normal file
View file

@ -0,0 +1,29 @@
#
# Sed script to parse CPP macros and generate output usable by make
#
# It is expected that this script is fed the output of 'gpp -dM'
# which preprocesses the common.h header files and outputs the final
# list of CPP macros (and whitespace is sanitized)
#
# Only process values prefixed with #define CONFIG_
/^#define CONFIG_[A-Za-z0-9_]\+/ {
# Strip the #define prefix
s/#define *//;
# Change to form CONFIG_*=VALUE
s/ \+/=/;
# Drop trailing spaces
s/ *$//;
# drop quotes around string values
s/="\(.*\)"$/=\1/;
# Concatenate string values
s/" *"//g;
# Wrap non-numeral values with quotes
s/=\(.*\?[^0-9].*\)$/=\"\1\"/;
# Change '1' and empty values to "y" (not perfect, but
# supports conditional compilation in the makefiles
s/=$/=y/;
s/=1$/=y/;
# print the line
p
}